WO2011011463A2 - Manipulation of an alternative respiratory pathway in photo-autotrophs - Google Patents

Manipulation of an alternative respiratory pathway in photo-autotrophs Download PDF

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Publication number
WO2011011463A2
WO2011011463A2 PCT/US2010/042666 US2010042666W WO2011011463A2 WO 2011011463 A2 WO2011011463 A2 WO 2011011463A2 US 2010042666 W US2010042666 W US 2010042666W WO 2011011463 A2 WO2011011463 A2 WO 2011011463A2
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sequence
dna
algal cell
seq
transformation construct
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PCT/US2010/042666
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French (fr)
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WO2011011463A3 (en
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Shaun Bailey
Bertrand Vick
Jeff Moseley
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Aurora Biofuels, Inc.
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Publication of WO2011011463A3 publication Critical patent/WO2011011463A3/en

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/12—Unicellular algae; Culture media therefor
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P7/00—Preparation of oxygen-containing organic compounds
    • C12P7/64—Fats; Fatty oils; Ester-type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
    • C12P7/6436—Fatty acid esters
    • C12P7/6445—Glycerides
    • C12P7/6463—Glycerides obtained from glyceride producing microorganisms, e.g. single cell oil

Definitions

  • This invention relates to molecular biology, and more specifically, to the expression of exogenous DNA elements in algal cells and/or the mutation of algal cells.
  • Exemplary methods for increasing TAG production in an algal cell during imbalanced growth conditions comprise knocking out an AOX gene, wherein the AOX gene produces an amino acid sequence having substantial similarity to the amino acid sequence of SEQ. ID. NO. 2.
  • the algal cell may be of genus Nannochloropsis.
  • the AOX gene may be replaced by a construct having a nucleotide sequence having substantial similarity to SEQ ID. NOS. 3 through 5 (inclusive), wherein each of the sequences are next to or in close proximity to one another in a linear fashion.
  • the AOX gene may be replaced via homologous recombination.
  • the AOX gene may have a nucleotide sequence with substantial similarity to SEQ ID. NO. 1.
  • the recombinant algal cell may be grown in the presence of an antibiotic in which the selected recombinant algal cell is resistant.
  • a marker gene may confer resistance to zeocine.
  • lipid production by the selected recombinant algal cell may be increased over that produced by a wild-type algal cell.
  • FIG. 1 shows an exemplary CLUSTALW alignment for three amino acids produced by various AOX genes, as found in three different types of algae.
  • FIG. 2 shows an exemplary gene structure and expression diagram for the wild-type Nannochloropsis (W2) AOX gene sequence, as found in the Nannochloropsis genome.
  • FIG. 3 shows exemplary TargetPl.l prediction data for the wild-type Nannochloropsis (W2) AOX gene sequence.
  • FIG. 4 shows a chart reflecting exemplary expression levels of the wild-type Nannochloropsis (W2) AOX gene sequence in the presence and absence of nutrients, labeled as (Nutrients ⁇ ) and (Nutrients-), respectively.
  • FIG. 5 shows a chart reflecting exemplary environmental oxygen concentrations in the presence of wild-type Nannochloropsis under varying light conditions over time.
  • FIG. 6 shows an exemplary W2 AOX knockout construct and integration site.
  • FIG. 7 shows a chart with actual exemplary data comparing the accumulation of fatty acid methyl esters (FAMES) during nutrient starvation of wild-type Nannochloropsis (WT) and mutant Nannochloropsis (All).
  • FAMES fatty acid methyl esters
  • SEQ. ID. NO. 1 is an exemplary nucleotide sequence for the AOX gene sequence.
  • SEQ. ID. NO. 2 is an exemplary amino acid sequence for the amino acid produced by SEQ. ID. NO. 1.
  • SEQ. ID. NO. 3 is an exemplary nucleotide sequence for a VCP promoter gene.
  • SEQ. ID. NO. 4 is an exemplary nucleotide sequence for a ble marker gene (confers resistance to zeocine).
  • SEQ. ID. NO. 5 is an exemplary nucleotide sequence for a 3' UTR gene.
  • a second form of respiratory electron flow employs an oxidase known as the alternative oxidase (AOX), which is generally located upstream to the cytochrome c oxidase in the respiratory pathway.
  • AOX alternative oxidase
  • the alternative respiratory pathway terminates electron flow with the reduction of molecular oxygen upstream of complex III, therefore bypassing this complex as well as the terminal cytochrome c oxidase. Since complex III and the cytochrome c oxidase pump protons during electron transport, alternative respiration leads to the formation of significantly less ATP per electron donor oxidized, relative to whole chain respiration. In this respect, alternative respiration is a wasteful process in terms of maximizing energy conversion from cellular reductant.
  • TAGs triacylglycerides
  • the loss of reductant through an alternative respiratory pathway that generally exists in wild type strains of various photo-autotrophs, such as marine algae, is restricted and/or eliminated by generating an oxidase deletion strain.
  • FIG. 1 shows an exemplary CLUSTALW alignment for three amino acids produced by various AOX genes, as found in three different types of algae.
  • CLUSTALW is a general purpose multiple sequence alignment program for DNA or proteins. Shown in FIG. 1 is an amino acid sequence alignment for two amino acids produced by two well-characterized AOX genes, as found in Chlamydomonas reinhardtii and Arabidopsis thaliana, with the Chlamydomonas reinhardtii having the AOXl gene sequence, and the Arabidopsis thaliana having the AOXlA gene sequence. Also shown in FIG. 1 is the amino acid sequence produced by wild-type Nannochloropsis (W2), having the AOX gene sequence. SEQ. ID. NO.
  • SEQ. ID. NO. 1 is an exemplary nucleotide sequence for the AOX gene sequence.
  • SEQ. ID. NO. 2 is an exemplary amino acid sequence for the amino acid produced by SEQ. ID. NO. 1. The close similarity of the two well-characterized amino acid sequences to the amino acid sequence produced by the wild-type
  • Nannochloropsis AOX gene sequence confirms the identity of the
  • Nannochloropsis AOX gene sequence Nannochloropsis AOX gene sequence.
  • FIG. 2 shows an exemplary gene structure and expression diagram for the wild-type Nannochloropsis (W2) AOX gene sequence, as found in the Nannochloropsis genome.
  • the exemplary gene structure and expression diagram is comprised of seven exons, including a 5' untranslated region (5'UTR), a 3' untranslated region (3'UTR), various introns between the exons, and a sequence gap.
  • 5'UTR 5' untranslated region
  • 3'UTR 3' untranslated region
  • various introns between the exons and a sequence gap.
  • the wild-type the wild-type
  • Nannochloropsis (W2) AOX gene sequence of FIG. 2 represents
  • the exemplary gene structure of FIG. 2 exists in the genome of the wild-type Nannochloropsis (W2). Prior to translation, the introns are spliced out, to form the exemplary AOX gene sequence comprising the 5' UTR, exonl through exon7 (inclusive), and the 3' UTR.
  • FIG. 3 shows exemplary TargetPl.l prediction data for the wild-type Nannochloropsis (W2) AOX gene sequence.
  • TargetPl.l is software that predicts the subcellular location of eukaryotic protein sequences. The assignment is based on the predicted presence of the following N-terminal presequences: chloroplast transit peptide (cTP), mitochondrial targeting peptide (mTP), and/or secretory pathway signal peptide (SP).
  • cTP chloroplast transit peptide
  • mTP mitochondrial targeting peptide
  • SP secretory pathway signal peptide
  • the Loc codes may be: C : chloroplast, i.e. the sequence contains cTP, a chloroplast transit peptide; M : mitochondrion, i.e. the sequence contains mTP, a mitochondrial targeting peptide; S : secretory pathway, i.e. the sequences contains SP, a signal peptide; and/or other: any other location.
  • RC indicates reliability class, from 1 to 5, where 1 indicates the strongest prediction.
  • the wild-type Nannochloropsis (W2) AOX gene sequence appears to be targeted to the mitochondrion.
  • FIG. 4 shows a chart reflecting exemplary expression levels of the wild-type Nannochloropsis (W2) AOX gene sequence in the presence and absence of nutrients, labeled as (Nutrients ⁇ ) and (Nutrients-),
  • the wild-type Nannochloropsis (W2) AOX gene sequence is expressed at reduced rates during balanced growth (e.g. balanced in terms of nutrients and/or illumination), and is up-regulated during imbalanced growth (e.g. following nutrient starvation and/or high illumination).
  • balanced growth e.g. balanced in terms of nutrients and/or illumination
  • imbalanced growth e.g. following nutrient starvation and/or high illumination.
  • a portion of environmental carbon e.g. CO2
  • Nannochloropsis and is retained in the form of triacylglyceride (TAG).
  • TAG triacylglyceride
  • Nannochloropsis is unable to retain other environmental carbon in the form of TAG and instead releases it in the form of carbon dioxide (CO2) by way of the alternative respiratory pathway, facilitated by the AOX gene sequence.
  • CO2 carbon dioxide
  • FIG. 5 shows a chart reflecting exemplary environmental oxygen concentrations in the presence of wild-type Nannochloropsis under varying light conditions over time.
  • periods of darkness are shaded; periods of light are not shaded.
  • Exposure of Nannochloropsis to excessive illumination results in stimulation of respiration, a significant proportion of which may be eliminated using the AOX specific inhibitor salicylhydroxamic acid (SHAM).
  • SHAM salicylhydroxamic acid
  • Since AOX activity is generally a pathway that eliminates cellular reductant in a wasteful manner, eliminating AOX activity may lead to an increased accumulation of reduced carbon in the form of either cellular components, resulting in higher rates of productivity, or as storage components, resulting in increased rates of TAG accumulation.
  • the introduction of 1 millimolar (mM) SHAM results in a decrease in the rate of oxygen consumption, evidencing the influence of the increased activity of the AOX protein on the alternative respiratory pathway of Nannochloropsis.
  • FIG. 6 shows an exemplary W2 AOX knockout construct and integration site.
  • the inventors generated the exemplary W2 AOX knockout construct as shown and described in connection with FIG. 6 to create a mutant Nannochloropsis. Utilizing homologous recombination as described in U.S. Non-Provisional Patent Application Serial No.
  • SEQ. ID. NO. 3 is an exemplary nucleotide sequence for a VCP promoter gene
  • SEQ. ID. NO. 4 is an exemplary nucleotide sequence for a ble marker gene (confers resistance to zeocine)
  • SEQ. ID. NO. 5 is an exemplary nucleotide sequence for a 3' UTR gene.
  • SEQ. ID. NOS. 3 - 5 as a unit, via homologous recombination, may replace the wild-type AOX gene as found in the genome of wild-type Nannochloropsis.
  • FIG. 7 shows a chart with actual exemplary data comparing the accumulation of fatty acid methyl esters (FAMES) during nutrient starvation of wild-type Nannochloropsis (WT) and mutant Nannochloropsis (All). TAGs are a subset of FAMES.
  • the mutant Nannochloropsis was constructed per FIG. 6 and the associated description herein. As shown in FIG. 7, the mutant Nannochloropsis (All) accumulates higher amounts of FAMES as a percentage of total mass at all times than the wild-type
  • Nannochloropsis (WT).

Abstract

Exemplary methods for increasing TAG production in an algal cell during imbalanced growth conditions are provided. Some methods comprise knocking out an AOX gene, wherein the AOX gene produces an amino acid sequence having substantial similarity to the amino acid sequence of SEQ. ID. NO. 2. In further methods, the algal cell may be of genus Nannochloropsis. The AOX gene may be replaced by a construct having a nucleotide sequence having substantial similarity to SEQ ID. NOS. 3 through 5 (inclusive), wherein each of the sequences are next to or in close proximity to one another in a linear fashion. In some methods, the AOX gene may be replaced via homologous recombination. As a result, lipid production by the selected recombinant algal cell may be increased over that produced by a wild-type algal cell.

Description

MANIPULATION OF AN ALTERNATIVE RESPIRATORY PATHWAY IN
PHOTO-AUTOTROPHS
CROSS-REFERENCE TO RELATED APPLICATIONS
[001] The present application claims the benefit and priority of U.S. Provisional Patent Application Serial No. 61/227,026 filed on July 20, 2009, titled Manipulation of an Alternative Respiratory Pathway in Photo- Autotrophs, the disclosure of which is hereby incorporated by reference.
[002] The present application is related to U.S. Non-Provisional Patent Application Serial No. 12/581,812 filed on October 19, 2009, titled "Homologous Recombination in an Algal Nuclear Genome," which is hereby incorporated by reference.
[003] The present application is related to U.S. Non-Provisional Patent Application Serial No. 12/480,635 filed on June 8, 2009, titled "VCP- Based Vectors for Algal Cell Transformation," which is hereby incorporated by reference.
[004] The present application is related to U.S. Non-Provisional Patent Application Serial No. 12/480,611 filed on June 8, 2009, titled
"Transformation of Algal Cells," which is hereby incorporated by reference.
REFERENCE TO SEQUENCE LISTINGS
[005] The present application is filed with sequence listing(s) attached hereto and incorporated by reference. BACKGROUND OF THE INVENTION
Field of the Invention
[006] This invention relates to molecular biology, and more specifically, to the expression of exogenous DNA elements in algal cells and/or the mutation of algal cells.
SUMMARY OF THE INVENTION
[007] Exemplary methods for increasing TAG production in an algal cell during imbalanced growth conditions are provided. Some methods comprise knocking out an AOX gene, wherein the AOX gene produces an amino acid sequence having substantial similarity to the amino acid sequence of SEQ. ID. NO. 2. In further methods, the algal cell may be of genus Nannochloropsis. The AOX gene may be replaced by a construct having a nucleotide sequence having substantial similarity to SEQ ID. NOS. 3 through 5 (inclusive), wherein each of the sequences are next to or in close proximity to one another in a linear fashion. In some methods, the AOX gene may be replaced via homologous recombination. Further, the AOX gene may have a nucleotide sequence with substantial similarity to SEQ ID. NO. 1.
Additionally, the recombinant algal cell may be grown in the presence of an antibiotic in which the selected recombinant algal cell is resistant. A marker gene may confer resistance to zeocine. As a result, lipid production by the selected recombinant algal cell may be increased over that produced by a wild-type algal cell.
BRIEF DESCRIPTION OF THE DRAWINGS
[008] FIG. 1 shows an exemplary CLUSTALW alignment for three amino acids produced by various AOX genes, as found in three different types of algae.
[009] FIG. 2 shows an exemplary gene structure and expression diagram for the wild-type Nannochloropsis (W2) AOX gene sequence, as found in the Nannochloropsis genome.
[0010] FIG. 3 shows exemplary TargetPl.l prediction data for the wild-type Nannochloropsis (W2) AOX gene sequence.
[0011] FIG. 4 shows a chart reflecting exemplary expression levels of the wild-type Nannochloropsis (W2) AOX gene sequence in the presence and absence of nutrients, labeled as (Nutrients÷) and (Nutrients-), respectively.
[0012] FIG. 5 shows a chart reflecting exemplary environmental oxygen concentrations in the presence of wild-type Nannochloropsis under varying light conditions over time.
[0013] FIG. 6 shows an exemplary W2 AOX knockout construct and integration site.
[0014] FIG. 7 shows a chart with actual exemplary data comparing the accumulation of fatty acid methyl esters (FAMES) during nutrient starvation of wild-type Nannochloropsis (WT) and mutant Nannochloropsis (All).
[0015] SEQ. ID. NO. 1 is an exemplary nucleotide sequence for the AOX gene sequence. [0016] SEQ. ID. NO. 2 is an exemplary amino acid sequence for the amino acid produced by SEQ. ID. NO. 1.
[0017] SEQ. ID. NO. 3 is an exemplary nucleotide sequence for a VCP promoter gene.
[0018] SEQ. ID. NO. 4 is an exemplary nucleotide sequence for a ble marker gene (confers resistance to zeocine).
[0019] SEQ. ID. NO. 5 is an exemplary nucleotide sequence for a 3' UTR gene.
DETAILED DESCRIPTION OF THE INVENTION
[0020] Whole chain electron transport in mitochondrial respiration typically involves four major protein complexes located in the inner mitochondrial membrane. During respiratory electron flow through these four complexes, electron donors, such as nicotinamide adenine dinucleotide phosphate (NADP), and succinate, become oxidized, while molecular oxygen ultimately becomes reduced by the terminal protein complex in the pathway known as cytochrome c oxidase. Respiratory electron flow is coupled to proton pumping across the mitochondrial inner membrane, generating a significant proton motive force (PMF). The PMF is subsequently released through the adenosine triphosphate (ATP) synthase, leading to the generation of energy rich molecular ATP.
[0021] A second form of respiratory electron flow, known as the alternative respiratory pathway, employs an oxidase known as the alternative oxidase (AOX), which is generally located upstream to the cytochrome c oxidase in the respiratory pathway. The alternative respiratory pathway terminates electron flow with the reduction of molecular oxygen upstream of complex III, therefore bypassing this complex as well as the terminal cytochrome c oxidase. Since complex III and the cytochrome c oxidase pump protons during electron transport, alternative respiration leads to the formation of significantly less ATP per electron donor oxidized, relative to whole chain respiration. In this respect, alternative respiration is a wasteful process in terms of maximizing energy conversion from cellular reductant. For oxygenic photo-autotrophs, it may be necessary to employ such a wasteful pathway during imbalanced growth, when more reduced carbon is generated through photosynthesis than can be used for growth and cell division. Examples of imbalanced growth include excessive irradiance and low nutrient status. The accumulation of excess reduced carbon during imbalanced growth may also be alleviated through the generation of triacylglycerides (TAGs).
[0022] According to various exemplary embodiments herein, the loss of reductant through an alternative respiratory pathway that generally exists in wild type strains of various photo-autotrophs, such as marine algae, is restricted and/or eliminated by generating an oxidase deletion strain.
[0023] FIG. 1 shows an exemplary CLUSTALW alignment for three amino acids produced by various AOX genes, as found in three different types of algae. CLUSTALW is a general purpose multiple sequence alignment program for DNA or proteins. Shown in FIG. 1 is an amino acid sequence alignment for two amino acids produced by two well-characterized AOX genes, as found in Chlamydomonas reinhardtii and Arabidopsis thaliana, with the Chlamydomonas reinhardtii having the AOXl gene sequence, and the Arabidopsis thaliana having the AOXlA gene sequence. Also shown in FIG. 1 is the amino acid sequence produced by wild-type Nannochloropsis (W2), having the AOX gene sequence. SEQ. ID. NO. 1 is an exemplary nucleotide sequence for the AOX gene sequence. SEQ. ID. NO. 2 is an exemplary amino acid sequence for the amino acid produced by SEQ. ID. NO. 1. The close similarity of the two well-characterized amino acid sequences to the amino acid sequence produced by the wild-type
Nannochloropsis AOX gene sequence confirms the identity of the
Nannochloropsis AOX gene sequence.
[0024] FIG. 2 shows an exemplary gene structure and expression diagram for the wild-type Nannochloropsis (W2) AOX gene sequence, as found in the Nannochloropsis genome. In FIG. 2, the exemplary gene structure and expression diagram is comprised of seven exons, including a 5' untranslated region (5'UTR), a 3' untranslated region (3'UTR), various introns between the exons, and a sequence gap. In total, the wild-type
Nannochloropsis (W2) AOX gene sequence of FIG. 2 represents
approximately 5,301 base pairs (bp). The exemplary gene structure of FIG. 2 exists in the genome of the wild-type Nannochloropsis (W2). Prior to translation, the introns are spliced out, to form the exemplary AOX gene sequence comprising the 5' UTR, exonl through exon7 (inclusive), and the 3' UTR.
[0025] FIG. 3 shows exemplary TargetPl.l prediction data for the wild-type Nannochloropsis (W2) AOX gene sequence. TargetPl.l is software that predicts the subcellular location of eukaryotic protein sequences. The assignment is based on the predicted presence of the following N-terminal presequences: chloroplast transit peptide (cTP), mitochondrial targeting peptide (mTP), and/or secretory pathway signal peptide (SP). For each input sequence (such as the AOX gene sequence), the following may be printed: Name (sequence name truncated to 20 characters), Len (sequence length), and/or Loc (prediction of localization, based on the scores). The Loc codes may be: C : chloroplast, i.e. the sequence contains cTP, a chloroplast transit peptide; M : mitochondrion, i.e. the sequence contains mTP, a mitochondrial targeting peptide; S : secretory pathway, i.e. the sequences contains SP, a signal peptide; and/or other: any other location. RC indicates reliability class, from 1 to 5, where 1 indicates the strongest prediction. As shown in FIG. 3, the wild-type Nannochloropsis (W2) AOX gene sequence appears to be targeted to the mitochondrion.
[0026] FIG. 4 shows a chart reflecting exemplary expression levels of the wild-type Nannochloropsis (W2) AOX gene sequence in the presence and absence of nutrients, labeled as (Nutrients÷) and (Nutrients-),
respectively. According to various exemplary embodiments, the wild-type Nannochloropsis (W2) AOX gene sequence is expressed at reduced rates during balanced growth (e.g. balanced in terms of nutrients and/or illumination), and is up-regulated during imbalanced growth (e.g. following nutrient starvation and/or high illumination). During imbalanced growth, a portion of environmental carbon (e.g. CO2) is consumed by wild-type
Nannochloropsis and is retained in the form of triacylglyceride (TAG). At the same time, Nannochloropsis is unable to retain other environmental carbon in the form of TAG and instead releases it in the form of carbon dioxide (CO2) by way of the alternative respiratory pathway, facilitated by the AOX gene sequence.
[0027] FIG. 5 shows a chart reflecting exemplary environmental oxygen concentrations in the presence of wild-type Nannochloropsis under varying light conditions over time. In the chart of FIG. 5, periods of darkness are shaded; periods of light are not shaded. Exposure of Nannochloropsis to excessive illumination results in stimulation of respiration, a significant proportion of which may be eliminated using the AOX specific inhibitor salicylhydroxamic acid (SHAM). Since AOX activity is generally a pathway that eliminates cellular reductant in a wasteful manner, eliminating AOX activity may lead to an increased accumulation of reduced carbon in the form of either cellular components, resulting in higher rates of productivity, or as storage components, resulting in increased rates of TAG accumulation. As shown in the chart of FIG. 5, the introduction of 1 millimolar (mM) SHAM results in a decrease in the rate of oxygen consumption, evidencing the influence of the increased activity of the AOX protein on the alternative respiratory pathway of Nannochloropsis.
[0028] FIG. 6 shows an exemplary W2 AOX knockout construct and integration site. In order to permanently eliminate AOX activity in marine algae, provide improved growth, and/or facilitate TAG accumulation (e.g. in outdoor pond systems), the inventors generated the exemplary W2 AOX knockout construct as shown and described in connection with FIG. 6 to create a mutant Nannochloropsis. Utilizing homologous recombination as described in U.S. Non-Provisional Patent Application Serial No. 12/581,812 filed on October 19, 2009, titled "Homologous Recombination in an Algal Nuclear Genome," which is hereby incorporated by reference, the inventors replaced the AOX gene sequence of the wild-type Nannochloropsis (W2) with the promoter, ble and 3' UTR genes as illustrated in the W2 AOX knockout construct shown in FIG. 6. Exemplary promoters, ble and 3' UTR genes that may be suitable for such purposes are described in U.S. Non-Provisional Patent Application Serial No. 12/480,635 filed on June 8, 2009, titled "VCP- Based Vectors for Algal Cell Transformation," which is hereby incorporated by reference. SEQ. ID. NO. 3 is an exemplary nucleotide sequence for a VCP promoter gene, SEQ. ID. NO. 4 is an exemplary nucleotide sequence for a ble marker gene (confers resistance to zeocine), and SEQ. ID. NO. 5 is an exemplary nucleotide sequence for a 3' UTR gene. SEQ. ID. NOS. 3 - 5, as a unit, via homologous recombination, may replace the wild-type AOX gene as found in the genome of wild-type Nannochloropsis.
[0029] FIG. 7 shows a chart with actual exemplary data comparing the accumulation of fatty acid methyl esters (FAMES) during nutrient starvation of wild-type Nannochloropsis (WT) and mutant Nannochloropsis (All). TAGs are a subset of FAMES. The mutant Nannochloropsis was constructed per FIG. 6 and the associated description herein. As shown in FIG. 7, the mutant Nannochloropsis (All) accumulates higher amounts of FAMES as a percentage of total mass at all times than the wild-type
Nannochloropsis (WT). [0030] While various embodiments have been described herein, it should be understood that they have been presented by way of example only, and not limitation. Thus, the breadth and scope of a preferred embodiment should not be limited by any of the herein-described exemplary
embodiments.

Claims

1. A method for increasing TAG production in an algal cell during
imbalanced growth conditions, the method comprising: knocking out an AOX gene.
2. The method of claim 1, wherein the AOX gene produces an amino acid sequence having substantial similarity to the amino acid sequence of SEQ. ID. NO. 2.
3. The method of claim 1, wherein the algal cell is of genus Nannochloropsis.
4. The method of claim 1, wherein the AOX gene is replaced by the construct having a nucleotide sequence having substantial similarity to SEQ ID. NOS. 3-5.
5. The method of claim 4, wherein the AOX gene is replaced by the
construct of claim 4 via homologous recombination.
6. The algal cell of claim 1, wherein the AOX gene has a nucleotide sequence with substantial similarity to SEQ ID. NO. 1.
7. The algal cell of claim 4, wherein the algal cell is grown in presence of an antibiotic in which the algal cell is resistant.
8. The algal cell of claim 4, wherein the marker gene confers resistance to zeocine.
9. The algal cell of claim 4, wherein the algal cell is of genus
Nannochloropsis.
10. The algal cell of claim 4, grown under imbalanced growth conditions.
11. The algal cell of claim 10, grown under starvation conditions.
12. The algal cell of claim 4, wherein lipid production is increased over that produced by a wild-type Nannochloropsis algal cell.
13. A transformation construct, the transformation construct having a first sequence of DNA similar to a corresponding first sequence of nuclear DNA of an algal cell, the transformation construct having a second sequence of DNA similar to a corresponding second sequence of nuclear DNA of the algal cell, and the transformation construct having a sequence of DNA of interest inserted between the first and second sequences of the transformation construct.
14. The transformation construct of claim 13, wherein the DNA of interest comprises a sequence having substantial similarity to SEQ. ID. NO. 3.
15. The transformation construct of claim 13, wherein the DNA of interest comprises a sequence having substantial similarity to SEQ. ID. NO. 4.
16. The transformation construct of claim 13, wherein the DNA of interest comprises a sequence having substantial similarity to SEQ. ID. NO. 5.
17. The transformation construct of claim 14, wherein the DNA of interest further comprises a sequence having substantial similarity to SEQ. ID. NO. 4.
18. The transformation construct of claim 17, wherein the DNA of interest comprises a sequence having substantial similarity to SEQ. ID. NO. 5.
19. A transformation method for introducing deoxyribonucleic acid (DNA) into the nucleus of an algal cell, the method comprising: preparing a transformation construct, the transformation construct having a first sequence of DNA similar to a corresponding first sequence of nuclear DNA, the transformation construct having a second sequence of DNA similar to a corresponding second sequence of the nuclear DNA, the transformation construct having a sequence of DNA of interest inserted between the first and second sequences of DNA of the transformation construct, and transforming a target sequence of DNA inserted between the first and second corresponding sequences of the nuclear DNA, resulting in
replacement of the target sequence of DNA with the sequence of DNA of interest, wherein the target sequence has substantial similarity to SEQ. ID. NO. 1.
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US8440805B2 (en) 2011-04-28 2013-05-14 Aurora Algae, Inc. Algal desaturases
US8709765B2 (en) 2009-07-20 2014-04-29 Aurora Algae, Inc. Manipulation of an alternative respiratory pathway in photo-autotrophs
US8722359B2 (en) 2011-01-21 2014-05-13 Aurora Algae, Inc. Genes for enhanced lipid metabolism for accumulation of lipids
US8753879B2 (en) 2008-06-06 2014-06-17 Aurora Alage, Inc. VCP-based vectors for algal cell transformation
US8809046B2 (en) 2011-04-28 2014-08-19 Aurora Algae, Inc. Algal elongases
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