Table I. Acetyl-CoA and lipid metabolism proteins identified in membranes of nitrogen-depleted E. oleoabundans.
Acetyl-CoA and lipid metabolism proteins identified with at least two unique peptides in two or more biological replicates of total microsomal membrane samples are described. Very-low-abundance proteins that were identified exclusively in one biological replicate and/or in FFZE membrane fractions are highlighted with asterisks. The calculated molecular masses are shown, together with the corresponding protein homologs in the model organisms C. reinhardtii (Cr) and Arabidopsis (At) and their corresponding percentage identity values (%ID). Common abbreviations (Abbr.) of the identified proteins are provided. Subcellular localizations were predicted (Pr) using PredAlgo. Curated cell locations (Cu) were established according to the protein homologs. References are provided for protein homologs whose cell locations have been demonstrated experimentally (NA, not available). C, Chloroplast; Cy, cytoplasm; FAE, fatty acid elongase complex; FAS, fatty acid synthase complex; M, mitochondria; O, other; PM, plasma membrane; PX, peroxisome; SP, signal peptide.
Protein Identifier | Curated Description | Abbr. | Molecular Mass | EC No. | Best Cr Homolog |
Best At Homolog |
Subcellular Localization |
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JGI Version 5.5 Identifier | %ID | The Arabidopsis Information Resource Version 10 Identifier | %ID | Pr | Cu | Reference | |||||
Acetyl-CoA synthesis | |||||||||||
m.73526 | Pyruvate dehydrogenase E1 component subunit α, chloroplastic*a | PDH | 47 | 1.2.4.1. | Cre02.g099850.t1.1 | 75 | AT1G01090 | 70 | C | Cb | Terashima et al. (2010) |
E1α | |||||||||||
m.371437 | Pyruvate dehydrogenase E1 component subunit β, chloroplastic | PDH | 41 | 1.2.4.1. | Cre03.g194200.t1.2 | 86 | AT1G30120 | 69 | C | Cb | Terashima et al. (2010) |
E1β | |||||||||||
m.130266 | Pyruvate dehydrogenase E2 component, chloroplastic | PDH E2 | 50 | 2.3.1.12 | Cre03.g158900.t1.2 | 74 | AT3G25860 | 54 | C | Cb | Terashima et al. (2010) |
m.324850 | Pyruvate dehydrogenase E3 component, chloroplastic | PDH E3 | 63 | 1.8.1.4. | Cre01.g016514.t1.1 | 72 | AT3G16950 | 60 | C | Cb | Terashima et al. (2010) |
m.396299 | ATP-citrate synthase α-chain protein*c | ACLA | 47 | 2.3.3.8. | Cre05.g241850.t1.2 | 62 | AT1G10670 | 65 | SP | Cyb | Fatland et al. (2002) |
m.391431 | ATP-citrate synthase β-chain protein | ACLB | 76 | 2.3.3.8. | Cre02.g088600.t1.2 | 77 | AT5G49460 | 75 | O | Cyb | Fatland et al. (2002) |
Lipid metabolism | |||||||||||
Acyl-lipid biosynthesis | |||||||||||
m.212887 | Acetyl-CoA carboxylase carboxyl transferase subunit α, chloroplastic | ACC | 60 | 6.4.1.2. | Cre12.g519100.t1.2 | 73 | AT2G38040 | 54 | C | Cb | Terashima et al. (2010) |
α-CT | |||||||||||
gi|3023244 | Acetyl-CoA carboxylase carboxyl transferase subunit β, chloroplastic*a | ACC | 47 | 6.4.1.2. | Cre12.g484000.t1.1 | 75 | ATCG00500 | 61 | O | Cb | Terashima et al. (2010) |
β-CT | |||||||||||
m.390372 | Biotin carboxylase, chloroplastic | ACC BCR | 61 | 6.3.4.14 6.4.1.2. | Cre08.g359350.t1.2 | 80 | AT5G35360 | 74 | C | Cb | Terashima et al. (2010) |
m.332618 | 3-Hydroxyacyl-[acyl-carrier-protein] dehydratase, chloroplastic*a | FAS HAD | 25 | 4.2.1.59. | Cre03.g208050.t1.2 | 70 | AT5G10160 | 54 | M | Cb | Terashima et al. (2010) |
m.179214 | Enoyl-[acyl-carrier-protein] reductase [NADH], chloroplastic*c | FAS ENR | 39 | 1.3.1.9. | Cre06.g294950.t1.1 | 82 | AT2G05990 | 76 | C | Cb | Terashima et al. (2010) |
m.84123 | β-Ketoacyl-CoA reductase*c | FAE KCR | 39 | 1.1.1.330. | Cre09.g392430.t1.1 | 32 | AT1G67730 | 43 | SP | Eb | Beaudoin et al. (2009) |
m.368848 | Long-chain acyl-CoA synthetase A | LCS | 71 | 6.2.1.3 | Cre13.g566650.t2.1 | 58 | AT4G23850 | 48 | O | LDb | Moellering and Benning (2010) |
m.224985 | Long-chain acyl-CoA synthetase B | LCS | 76 | 6.2.1.3 | Cre13.g566650.t2.1 | 47 | AT4G11030 | 43 | SP | LDb | Moellering and Benning (2010) |
m.371326 | Long-chain acyl-CoA synthetase C | LCS | 67 | 6.2.1.3 | Cre12.g507400.t1.2 | 63 | AT5G27600 | 53 | M | Md | NA |
Isoprenoid biosynthesis via the mevalonate pathway | |||||||||||
m.149328 | Acetyl-CoA acetyltransferase*a | ACAT | 51 | 2.3.1.9. | Cre02.g146050.t1.2 | 64 | AT5G47720 | 59 | M | Cyb | Carrie et al. (2007) |
Glycerolipid biosynthesis | |||||||||||
m.241864 | Glycerol-3-phosphate acyltransferase*e | GPAT | 54 | 2.3.1.15. | Cre06.g273250.t1.2 | 55 | AT5G60620 | 60 | O | Eb, LDb | Gidda et al. (2009); Nguyen et al. (2011) |
m.357823 | 1-Acyl-sn-glycerol-3-phosphate acyltransferase, chloroplastic*a | LPAAT | 37 | 2.3.1.51. | Cre09.g398289.t1.1 | 63 | AT4G30580 | 56 | C | Cb, LDb | Ferro et al. (2010); Nguyen et al. (2011) |
m.250190 | Acyltransferase family protein*c | 54 | NA | NA | NA | NA | NA | C | U | NA | |
Lipid signaling | |||||||||||
m.34057 | Phosphatidylinositol 4-kinase α*a | PI4Kα | 213 | 2.7.1.67. | Cre05.g245550.t1.1 | 45 | AT1G49340 | 39 | O | PMb, LDb | Nguyen et al. (2011); Zhang and Peck (2011) |
m.226782 | Sac1p-like phosphoinositide phosphatase*a | SAC1 | 69 | 3.1.1.- | Cre09.g388750.t1.2 | 43 | AT3G51460 | 39 | O | Eb, LDb | Despres et al. (2003); Nguyen et al. (2011) |
LD structural proteins | |||||||||||
m.413736 | Major lipid droplet protein | MLDP | 28 | NA | Cre12.g491550.t1.2 | 24 | NA | NA | O | LDb | Davidi et al. (2012) |
m.392627 | Probable plastid-lipid associated protein A, chloroplastic | PLAP | 59 | NA | Cre07.g325736.t1.1 | 42 | AT5G19940 | 32 | M | Cb | Terashima et al. (2010) |
m.50827 | Probable plastid-lipid associated protein B, chloroplastic | PLAP | 42 | NA | Cre03.g189300.t1.1 | 44 | AT4G04020 | 48 | M | Cb | Ferro et al. (2010) |
m.244306 | Probable plastid-lipid associated protein C, chloroplastic | PLAP | 23 | NA | Cre03.g188650.t1.2 | 62 | AT3G26070 | 58 | C | Cb | Terashima et al. (2010) |
gi|132270 | Rubber elongation factor protein*a | REF | 15 | NA | NA | NA | AT3G05500 | 48 | O | LDb | Horn et al. (2013) |
Lipid trafficking | |||||||||||
m.216464 | Membrane-associated 30-kD protein, chloroplastic | VIPP1 | 33 | NA | Cre13.g583550.t1.2 | 54 | AT1G65260 | 54 | C | Cb | Nordhues et al. (2012) |
m.362261 | Protein trigalactosyldiacylglycerol 2, chloroplastic | TGD2 | 44 | NA | Cre16.g694400.t1.2 | 57 | AT3G20320 | 40 | O | Cb | Terashima et al. (2010) |
m.116135 | Phospholipid-transporting ATPase*a | ALA | 159 | 3.6.3.1. | Cre16.g656500.t1.1 | 32 | AT1G59820 | 33 | O | Eb, PMb | Poulsen et al. (2008); Mitra et al. (2009) |
m.417181 | ABC transporter G family member A | ABCG | 70 | 3.6.3.- | Cre07.g313250.t1.2 | 57 | AT3G55100 | 31 | O | PMd | NA |
m.306564 | ABC transporter G family member C | ABCG | 69 | 3.6.3.- | Cre07.g313250.t1.2 | 55 | AT3G55100 | 29 | O | PMd | NA |
m.117336 | Chloroplast J-like domain-containing protein | CJD1 | 30 | NA | Cre03.g171100.t1.1 | 34 | AT1G08640 | 26 | C | Cb | Ajjawi et al. (2011) |
Lipases and fatty acid β-oxidation | |||||||||||
m.419400 | Putative triacylglycerol lipase*a | TGL | 47 | 3.1.1.3. | Cre07.g348550.t1.1 | 42 | AT5G67050 | 37.3 | SP | Cyd | NA |
m.225854 | Acyl-CoA oxidase A, peroxisomal*a | ACX | 75 | 1.3.3.6. | Cre05.g232002.t1.1 | 66 | AT5G65110 | 57.9 | O | PXb | Stabenau et al. (1984) |
m.366023 | Acyl-CoA oxidase B, peroxisomal*e | ACX | 74 | 1.3.3.6. | Cre11.g467350.t1.2 | 62 | AT1G06290 | 36 | O | PXb | Stabenau et al. (1984) |
m.420224 | Fatty acid β-oxidation multifunctional protein, peroxisomal*c | MFP | 77 | 4.2.1.17. 1.1.1.35. | Cre16.g695050.t1.2 | 66 | AT3G06860 | 55 | SP | PXb | Stabenau et al. (1984) |
m.356362 | 2,4-Dienoyl-CoA reductase, peroxisomal*c | RED | 35 | 1.3.1.4. | Cre17.g731850.t1.2 | 64 | AT3G12800 | 53 | SP | PXb | Reumann et al. (2009) |
Protein identified exclusively in FFZE membrane fractions bExperimental evidence of subcellular location is available. cProtein identified in one biological replicate of total microsomal samples and in FFZE membrane fractions. dExperimental evidence of subcellular location is not available. eProtein identified in only one biological replicate of total microsomal samples.