Protein: Phosphatidylserine decarboxylase proenzyme 1, mitochondrial (EC 4.1.1.65) [Cleaved into: Phosphatidylserine decarboxylase 1 beta chain; Phosphatidylserine decarboxylase 1 alpha chain] (P39006)
Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast)
Function: Catalyzes the formation of phosphatidylethanolamine (PtdEtn) from phosphatidylserine (PtdSer). Plays a central role in phospholipid metabolism and in the interorganelle trafficking of phosphatidylserine. Phosphatidylethanolamine formed in the mitochondria is exported to other membranes to fullfill their requirements for PtdEtn. Required for normal mitochondrial morphology and proper mitochondrial fusion during yeast mating. Involved in lipid droplet biogenesis at the endoplasmic reticulum membrane. Required for induction of mitophagy during nitrogen starvation. Appears to play a specific role in supporting respiratory complex III activity.
Subcellular location: [Phosphatidylserine decarboxylase 1 beta chain]: Mitochondrion inner membrane {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000269|PubMed:14576278, ECO:0000269|PubMed:22984266, ECO:0000269|PubMed:23124206, ECO:0000269|PubMed:29290583, ECO:0000269|PubMed:3005242, ECO:0000269|PubMed:33718843, ECO:0000305|PubMed:34818062}; Single-pass membrane protein {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000305|PubMed:22984266}; Intermembrane side {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000269|PubMed:14562095, ECO:0000269|PubMed:14576278, ECO:0000269|PubMed:22984266, ECO:0000269|PubMed:23124206}.; SUBCELLULAR LOCATION: [Phosphatidylserine decarboxylase 1 alpha chain]: Mitochondrion inner membrane {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000269|PubMed:14576278, ECO:0000269|PubMed:22984266, ECO:0000269|PubMed:23124206, ECO:0000269|PubMed:29290583, ECO:0000269|PubMed:3005242, ECO:0000305|PubMed:34818062}; Peripheral membrane protein {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000269|PubMed:22984266}; Intermembrane side {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000269|PubMed:14562095, ECO:0000269|PubMed:14576278, ECO:0000269|PubMed:22984266, ECO:0000269|PubMed:23124206}. Note=Anchored to the mitochondrial inner membrane through its interaction with the integral membrane beta chain. {ECO:0000255|HAMAP-Rule:MF_03208, ECO:0000269|PubMed:22984266}.; SUBCELLULAR LOCATION: Lipid droplet {ECO:0000269|PubMed:34818062}. Endoplasmic reticulum membrane {ECO:0000269|PubMed:29290583, ECO:0000269|PubMed:34818062}. Note=Localizes to sites of lipid droplet formation on the endoplasmic reticulum membrane. {ECO:0000269|PubMed:34818062}.
Interaction partners:
- CDP-diacylglycerol--serine O-phosphatidyltransferase
- Phosphatidylserine decarboxylase proenzyme 2
- Phosphatidyl-N-methylethanolamine N-methyltransferase
- Phosphatidylethanolamine N-methyltransferase
- Cardiolipin synthase
- Choline/ethanolaminephosphotransferase 1
- Lysophospholipid acyltransferase
- Mitochondrial inner membrane protein OXA1
- Phospholipase D1
- CDP-diacylglycerol--inositol 3-phosphatidyltransferase
Sequence:
MSIMPVKNALAQGRTLLMGRMPAVKFSTRMQLRNRTAVLWNRKFSTRLFVQQRRSSGEIVDRAKAAAANSGRKQVSMKWVVLTSFTIVLGTILLVSRNDSTEEDATEGKKGRRTRKIKIFNNNWLFFCYSTLPLNAMSRLWGQVNSLTLPIWVRPWGYRLYSFLFGVNLDEMEDPDLTHYANLSEFFYRNIKPGTRPVAQGEDVIASPSDGKILQVGIINSETGEIEQVKGMTYSIKEFLGTHSHPLMSKSASSLDLTSDEEKHREFARVNRIQLAGSEDTEQPLLNFKNEGDQSVREFKPSVSKNIHLLSQLSLNYFSNGFSCSEPHDTELFFAVIYLAPGDYHHFHSPVDWVCKVRRHFPGDLFSVAPYFQRNFPNLFVLNERVALLGSWKYGFFSMTPVGATNVGSIKLNFDQEFVTNSKSDKHLEPHTCYQAVYENASKILGGMPLVKGEEMGGFELGSTVVLCFEAPTEFKFDVRVGDKVKMGQKLGIIGKNDLK