PA2B1_MICPY
ID PA2B1_MICPY Reviewed; 34 AA.
AC P0CAS9;
DT 16-JUN-2009, integrated into UniProtKB/Swiss-Prot.
DT 16-JUN-2009, sequence version 1.
DT 03-AUG-2022, entry version 33.
DE RecName: Full=Phospholipase A2 B1;
DE Short=svPLA2;
DE EC=3.1.1.4;
DE AltName: Full=Phosphatidylcholine 2-acylhydrolase;
DE Flags: Fragment;
OS Micrurus pyrrhocryptus (Coral snake).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC Serpentes; Colubroidea; Elapidae; Elapinae; Micrurus.
OX NCBI_TaxID=129468;
RN [1]
RP PROTEIN SEQUENCE, AND MASS SPECTROMETRY.
RC TISSUE=Venom;
RX PubMed=19135468; DOI=10.1016/j.toxicon.2008.12.015;
RA Dokmetjian J.C., Del Canto S., Vinzon S., de Jimenez Bonino M.B.;
RT "Biochemical characterization of the Micrurus pyrrhocryptus venom.";
RL Toxicon 53:375-382(2009).
CC -!- FUNCTION: Snake venom phospholipase A2 (PLA2) that inhibits
CC neuromuscular transmission by blocking acetylcholine release from the
CC nerve termini. PLA2 catalyzes the calcium-dependent hydrolysis of the
CC 2-acyl groups in 3-sn-phosphoglycerides (By similarity). {ECO:0000250}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-
CC glycero-3-phosphocholine + a fatty acid + H(+); Xref=Rhea:RHEA:15801,
CC ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:28868,
CC ChEBI:CHEBI:57643, ChEBI:CHEBI:58168; EC=3.1.1.4;
CC Evidence={ECO:0000255|PROSITE-ProRule:PRU10035, ECO:0000255|PROSITE-
CC ProRule:PRU10036};
CC -!- COFACTOR:
CC Name=Ca(2+); Xref=ChEBI:CHEBI:29108; Evidence={ECO:0000250};
CC Note=Binds 1 Ca(2+) ion. {ECO:0000250};
CC -!- SUBCELLULAR LOCATION: Secreted.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC -!- PTM: Contains seven disulfide bonds. {ECO:0000250}.
CC -!- MASS SPECTROMETRY: Mass=14246; Method=Electrospray;
CC Evidence={ECO:0000269|PubMed:19135468};
CC -!- SIMILARITY: Belongs to the phospholipase A2 family. Group II subfamily.
CC {ECO:0000305}.
CC -!- CAUTION: Surprinsingly, this protein (from the Elapidae family) shows a
CC high similarity with phospholipases A2 from the Viperidae family, which
CC belongs to the group II of phospholipases A2, in contrast to the
CC Elapidae family that belongs to the group I. {ECO:0000305}.
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DR AlphaFoldDB; P0CAS9; -.
DR SMR; P0CAS9; -.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0005509; F:calcium ion binding; IEA:InterPro.
DR GO; GO:0004623; F:phospholipase A2 activity; IEA:UniProtKB-EC.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR GO; GO:0050482; P:arachidonic acid secretion; IEA:InterPro.
DR GO; GO:0016042; P:lipid catabolic process; IEA:UniProtKB-KW.
DR GO; GO:0006644; P:phospholipid metabolic process; IEA:InterPro.
DR Gene3D; 1.20.90.10; -; 1.
DR InterPro; IPR001211; PLipase_A2.
DR InterPro; IPR036444; PLipase_A2_dom_sf.
DR PRINTS; PR00389; PHPHLIPASEA2.
DR SUPFAM; SSF48619; SSF48619; 1.
PE 1: Evidence at protein level;
KW Calcium; Direct protein sequencing; Disulfide bond; Hydrolase;
KW Lipid degradation; Lipid metabolism; Metal-binding; Neurotoxin;
KW Presynaptic neurotoxin; Secreted; Toxin.
FT CHAIN 1..>34
FT /note="Phospholipase A2 B1"
FT /id="PRO_0000376926"
FT BINDING 27
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT BINDING 29
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT BINDING 31
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT NON_TER 34
SQ SEQUENCE 34 AA; 3986 MW; 753EA74F07CF5D93 CRC64;
HLLQFNKVIK FETRKNAIPF YAFYGCYCGW GGRG
