PA2B2_ACAAN
ID PA2B2_ACAAN Reviewed; 118 AA.
AC P81237;
DT 15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
DT 15-JUL-1998, sequence version 1.
DT 03-AUG-2022, entry version 93.
DE RecName: Full=Basic phospholipase A2 acanthin-2;
DE Short=svPLA2;
DE EC=3.1.1.4;
DE AltName: Full=Acanthin II;
DE AltName: Full=Phosphatidylcholine 2-acylhydrolase;
OS Acanthophis antarcticus (Common death adder).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC Serpentes; Colubroidea; Elapidae; Acanthophiinae; Acanthophis.
OX NCBI_TaxID=8605;
RN [1]
RP PROTEIN SEQUENCE, FUNCTION, AND MASS SPECTROMETRY.
RC TISSUE=Venom;
RX PubMed=9637731; DOI=10.1006/abbi.1998.0685;
RA Chow G., Subburaju S., Kini R.M.;
RT "Purification, characterization, and amino acid sequence determination of
RT acanthins, potent inhibitors of platelet aggregation from Acanthophis
RT antarcticus (common death adder) venom.";
RL Arch. Biochem. Biophys. 354:232-238(1998).
CC -!- FUNCTION: Snake venom phospholipase A2 (PLA2) that potently inhibits
CC ADP-(IC(50)=12 nM) and collagen-induced (IC(50)=4 nM) platelet
CC aggregation when tested on human whole blood. PLA2 catalyzes the
CC calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-
CC phosphoglycerides. {ECO:0000269|PubMed:9637731}.
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 -!- MASS SPECTROMETRY: Mass=12895.63; Method=Electrospray;
CC Evidence={ECO:0000269|PubMed:9637731};
CC -!- SIMILARITY: Belongs to the phospholipase A2 family. Group I subfamily.
CC D49 sub-subfamily. {ECO:0000305}.
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DR AlphaFoldDB; P81237; -.
DR SMR; P81237; -.
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 CDD; cd00125; PLA2c; 1.
DR Gene3D; 1.20.90.10; -; 1.
DR InterPro; IPR001211; PLipase_A2.
DR InterPro; IPR033112; PLipase_A2_Asp_AS.
DR InterPro; IPR016090; PLipase_A2_dom.
DR InterPro; IPR036444; PLipase_A2_dom_sf.
DR InterPro; IPR033113; PLipase_A2_His_AS.
DR PANTHER; PTHR11716; PTHR11716; 1.
DR Pfam; PF00068; Phospholip_A2_1; 1.
DR PRINTS; PR00389; PHPHLIPASEA2.
DR SMART; SM00085; PA2c; 1.
DR SUPFAM; SSF48619; SSF48619; 1.
DR PROSITE; PS00119; PA2_ASP; 1.
DR PROSITE; PS00118; PA2_HIS; 1.
PE 1: Evidence at protein level;
KW Calcium; Direct protein sequencing; Disulfide bond;
KW Hemostasis impairing toxin; Hydrolase; Lipid degradation; Lipid metabolism;
KW Metal-binding; Platelet aggregation inhibiting toxin; Secreted; Toxin.
FT CHAIN 1..118
FT /note="Basic phospholipase A2 acanthin-2"
FT /id="PRO_0000161592"
FT ACT_SITE 48
FT /evidence="ECO:0000250"
FT ACT_SITE 92
FT /evidence="ECO:0000250"
FT BINDING 28
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT BINDING 30
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT BINDING 32
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT BINDING 49
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250"
FT DISULFID 11..71
FT /evidence="ECO:0000250"
FT DISULFID 27..117
FT /evidence="ECO:0000250"
FT DISULFID 29..45
FT /evidence="ECO:0000250"
FT DISULFID 44..98
FT /evidence="ECO:0000250"
FT DISULFID 51..91
FT /evidence="ECO:0000250"
FT DISULFID 60..84
FT /evidence="ECO:0000250"
FT DISULFID 78..89
FT /evidence="ECO:0000250"
SQ SEQUENCE 118 AA; 12884 MW; E1477D186C06B3EB CRC64;
NLYQFGGMIQ CANKGARSWL SYVNYGCYCG WGGSGTPVDE LDRCCQIHDN CYGEAEKKRC
GPKMTLYSWE CANDVPVCNS KSACEGFVCD CDAAAAKCFA KAPYNKNNIG IGSKTRCQ
