C8Z966 · C8Z966_YEAS8

Function

function

Catalyzes the formation of phosphatidylethanolamine (PtdEtn) from phosphatidylserine (PtdSer). Plays a central role in phospholipid metabolism and in the interorganelle trafficking of phosphatidylserine.

Catalytic activity

Cofactor

pyruvate (UniProtKB | Rhea| CHEBI:15361 )

Note: Binds 1 pyruvoyl group covalently per subunit.

Pathway

Lipid metabolism.
Phospholipid metabolism; phosphatidylethanolamine biosynthesis; phosphatidylethanolamine from CDP-diacylglycerol: step 2/2.

Features

Showing features for active site, site.

TypeIDPosition(s)Description
Active site899Charge relay system; for autoendoproteolytic cleavage activity
Active site956Charge relay system; for autoendoproteolytic cleavage activity
Site1042-1043Cleavage (non-hydrolytic); by autocatalysis
Active site1043Charge relay system; for autoendoproteolytic cleavage activity
Active site1043Schiff-base intermediate with substrate; via pyruvic acid; for decarboxylase activity

GO annotations

AspectTerm
Cellular Componentendosome membrane
Cellular ComponentGolgi membrane
Cellular ComponentGolgi stack
Molecular Functionphosphatidylserine decarboxylase activity
Biological Processphosphatidylethanolamine biosynthetic process
Biological Processprotein autoprocessing

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

Gene names

    • Name
      PSD2
    • ORF names
      EC1118_1G1_4951g

Organism names

Accessions

  • Primary accession
    C8Z966

Proteomes

    • Identifier
    • Component
      Chromosome VII, Scaffold EC1118_1G1

Subcellular Location

Golgi apparatus membrane
; Peripheral membrane protein
Endosome membrane
; Peripheral membrane protein

Keywords

PTM/Processing

Features

Showing features for chain, modified residue.

TypeIDPosition(s)Description
ChainPRO_50234133731-1042Phosphatidylserine decarboxylase 2 beta chain
Modified residue1043Pyruvic acid (Ser); by autocatalysis
ChainPRO_50234133721043-1138Phosphatidylserine decarboxylase 2 alpha chain

Post-translational modification

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.

Keywords

Interaction

Subunit

Heterodimer of a large membrane-associated beta subunit and a small pyruvoyl-containing alpha subunit. Interacts with pstB2. This interaction may be a means to structurally tether the donor membrane (ER) harboring PstB2 to acceptor membranes (Golgi/endosomes) harboring PSD2 during PtdSer transport to the site of PtdEtn synthesis.

Family & Domains

Features

Showing features for domain, region, compositional bias.

TypeIDPosition(s)Description
Domain1-122C2
Region90-166Disordered
Compositional bias97-166Polar residues
Compositional bias269-292Polar residues
Region269-305Disordered
Region411-453Disordered
Compositional bias419-449Acidic residues
Domain478-600C2

Domain

The C2 domains have an essential, but non-catalytic function. They may facilitate interaction with PstB2 and are required for lipid transport function.

Sequence similarities

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    1,138
  • Mass (Da)
    130,064
  • Last updated
    2009-11-03 v1
  • Checksum
    F9525E88291AE4CB
MRIIKGRKRGKNKKPTLILKIHVIQAENIEALKTFNCNPVCFVTTNTFYSQKTNKLKNSNTHWNQTLRIKLPRNPTSEWLRIIVYDALPTGAPPTTPSRPRTTTANTSSSTLSNSGLSSHSHSSRNLNVTSKGNQTSTSINSVSSSATPAPSHSSSSLSTTGPGSTHKNRINSYLYLGEAKISLLDLFKRKDTTTSYKFSIEAQRYHLYDMKRGKDQDSLNCNFLVGDILLGFKLECNVKRTPTFQAFNAWRNELNTYLGRIDRNKARMRSSSSLPPPLEDMLSNSSAVSGNEIRREKPYSDTDLAHDEEVNAEDEIDAEESIEDMNSSGSICTERRYDIDNDTIFDSISEVVSLNDEELDILNDFEEADHPNVPDINVHDIDEDTRISLSSMITALDEYDIVEPEDVAKLPAVSENDITSVDDEESENQQESDEEFDIYNEDEREDSDSQSNEYIGSRLLHLQRGKHNKSYANYLYRRAKSNFFISKKEHAMGVVFMHIGAIKNLPALRNRLSKTNYEMDPFIVISFGRRVFKTSWRKHTLNPEFNEYAAFEVFPHETNFAFSIKVVDKDSFSFNDDVAKCELAWFDMLQQQQHENEWIPYEIPLDLTVEPAHAPKQPVLYSSFKYVSYPFLKKSFWKEAVDTSVNLERLDIIQVMLYLERLGSFTMADSFELFQHFNKSAWAGQSITRSQLVEGLQSWRKSTNFKRIWTCPRCMRSCKPTRNARRSKLVLENDSITHFAICTFSKEHKTLKPSYVSSAFASKRWFSKVLIKLTYGKYALGSNNANILVQDRDTGIIIEEKISAHVKLGMRIIYNGKSPESKKFRSLLKTLSIRQGKKFDSTASAKQIEPFIKFHSLDLSQCRDKDFKTFNEFFYRKLKPGSRLPESNNKEILFSPADSRCTVFPTIQESKEIWVKGRKFSIKKLANNYNPETFNDNNCSIGIFRLAPQDYHRFHSPCNGTIGKPVYVDGEYYTVNPMAVRSELDVFGENIRVIIPIDSPQFGKLLYIPIGAMMVGSILLTCKENDVVESGQELGYFKFGGSTIIIIIPHNNFMFDSDLVKNSSERIETLVKVGMSIGHTSNVNELKRIRIKVDDPKKIERIKRTISVSDENAKSTGNVTWEYHTLREMMNKDFAGL

Features

Showing features for compositional bias.

TypeIDPosition(s)Description
Compositional bias97-166Polar residues
Compositional bias269-292Polar residues
Compositional bias419-449Acidic residues

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
FN393070
EMBL· GenBank· DDBJ
CAY79932.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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