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Annotation rule MF_00662
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General rule information [?]

Accession MF_00662
Dates 28-JUN-2003 (Created)
18-MAR-2020 (Last updated, Version 28)
Name PS_decarb_PSD_B_type1
Templates P0A8K1 (PSD_ECOLI); P39822 (PSD_BACSU): [Recover all]

Propagated annotation [?]

Identifier, protein and gene names [?]

Protein name
RecName: Full=Phosphatidylserine decarboxylase proenzyme;
RecName: Full=Phosphatidylserine decarboxylase alpha chain;
RecName: Full=Phosphatidylserine decarboxylase beta chain;
Gene name

Comments [?]

Function Catalyzes the formation of phosphatidylethanolamine (PtdEtn) from phosphatidylserine (PtdSer).
Catalytic activity RHEA:20828: a 1,2-diacyl-sn-glycero-3-phospho-L-serine + H(+) = a 1,2-diacyl-sn-glycero-3-phosphoethanolamine + CO2
Cofactor pyruvate
Note: Binds 1 pyruvoyl group covalently per subunit.
Pathway Phospholipid metabolism; phosphatidylethanolamine biosynthesis; phosphatidylethanolamine from CDP-diacylglycerol: step 2/2.
Subunit Heterodimer of a large membrane-associated beta subunit and a small pyruvoyl-containing alpha subunit.
Subcellular location Cell membrane; Peripheral membrane protein.
Ptm Is synthesized initially as an inactive proenzyme. Formation of the active enzyme involves a self-maturation process in which the active site pyruvoyl group is generated from an internal serine residue via an autocatalytic post-translational modification. Two non-identical subunits are generated from the proenzyme in this reaction, and the pyruvate is formed at the N-terminus of the alpha chain, which is derived from the carboxyl end of the proenzyme. The autoendoproteolytic cleavage occurs by a canonical serine protease mechanism, in which the side chain hydroxyl group of the serine supplies its oxygen atom to form the C-terminus of the beta chain, while the remainder of the serine residue undergoes an oxidative deamination to produce ammonia and the pyruvoyl prosthetic group on the alpha chain. During this reaction, the Ser that is part of the protease active site of the proenzyme becomes the pyruvoyl prosthetic group, which constitutes an essential element of the active site of the mature decarboxylase.
Similarity Belongs to the phosphatidylserine decarboxylase family. PSD-B subfamily. Prokaryotic type I sub-subfamily.

Keywords [?]

Gene Ontology [?]

GO:0005886; Cellular component: plasma membrane.
GO:0004609; Molecular function: phosphatidylserine decarboxylase activity.
GO:0008654; Biological process: phospholipid biosynthetic process.

Cross-references [?]

Pfam PF02666; PS_Dcarbxylase; 1;
TIGRFAMs TIGR00163; PS_decarb; 1;

Features [?]

From: PSD_ECOLI (P0A8K1)
Key     From     To       Description   Tag   Condition   FTGroup
CHAIN     Nter     253       Phosphatidylserine decarboxylase beta chain        
CHAIN     254     Cter       Phosphatidylserine decarboxylase alpha chain        
ACT_SITE     90     90       Charge relay system; for autoendoproteolytic cleavage activity     D  
ACT_SITE     147     147       Charge relay system; for autoendoproteolytic cleavage activity     H  
ACT_SITE     254     254       Charge relay system; for autoendoproteolytic cleavage activity     S  
ACT_SITE     254     254       Schiff-base intermediate with substrate; via pyruvic acid; for decarboxylase activity     S  
SITE     253     254       Cleavage (non-hydrolytic); by autocatalysis     G-S  
MOD_RES     254     254       Pyruvic acid (Ser); by autocatalysis     S  

Additional information [?]

Size range 259-341 amino acids
Related rules MF_00663 (PSD); MF_00664 (PSD)
Fusion Nter: <Unknown>, <Rhodanese domains>; Cter: None
Comments Classification of phosphatidylserine decarboxylase into subfamilies was done according to Daiyasu at al.(2005) (PubMed:16243780) for PSD-A and PSD-B and Voelker D.R.(1997) (PubMed:9370338) for type I and type II.