ID   PA2BK_LATCO             Reviewed;         154 AA.
AC   Q8UUH7;
DT   25-NOV-2002, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 1.
DT   03-AUG-2022, entry version 88.
DE   RecName: Full=Basic phospholipase A2 PC20;
DE            Short=svPLA2;
DE            EC=3.1.1.4;
DE   AltName: Full=Phosphatidylcholine 2-acylhydrolase;
DE   Flags: Precursor;
OS   Laticauda colubrina (Yellow-lipped sea krait) (Banded sea krait).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Elapidae; Laticaudinae; Laticauda.
OX   NCBI_TaxID=8628;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   TISSUE=Liver;
RX   PubMed=12076640; DOI=10.1016/s0041-0101(01)00272-0;
RA   Fujimi T.J., Tsuchiya T., Tamiya T.;
RT   "A comparative analysis of invaded sequences from group IA phospholipase
RT   A(2) genes provides evidence about the divergence period of genes groups
RT   and snake families.";
RL   Toxicon 40:873-884(2002).
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 {ECO:0000250}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC   -!- SIMILARITY: Belongs to the phospholipase A2 family. Group I subfamily.
CC       D49 sub-subfamily. {ECO:0000305}.
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DR   EMBL; AB062448; BAB72255.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q8UUH7; -.
DR   SMR; Q8UUH7; -.
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   3: Inferred from homology;
KW   Calcium; Disulfide bond; Hydrolase; Lipid degradation; Lipid metabolism;
KW   Metal-binding; Neurotoxin; Presynaptic neurotoxin; Secreted; Signal; Toxin.
FT   SIGNAL          1..21
FT                   /evidence="ECO:0000255"
FT   PROPEP          22..27
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000022884"
FT   CHAIN           28..154
FT                   /note="Basic phospholipase A2 PC20"
FT                   /id="PRO_0000022885"
FT   ACT_SITE        75
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        119
FT                   /evidence="ECO:0000250"
FT   BINDING         55
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000250"
FT   BINDING         57
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000250"
FT   BINDING         59
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000250"
FT   BINDING         76
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000250"
FT   DISULFID        38..98
FT                   /evidence="ECO:0000250"
FT   DISULFID        54..143
FT                   /evidence="ECO:0000250"
FT   DISULFID        56..72
FT                   /evidence="ECO:0000250"
FT   DISULFID        71..125
FT                   /evidence="ECO:0000250"
FT   DISULFID        78..118
FT                   /evidence="ECO:0000250"
FT   DISULFID        87..111
FT                   /evidence="ECO:0000250"
FT   DISULFID        105..116
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   154 AA;  17006 MW;  01835C7927E29EF1 CRC64;
     MYPAHLLVLL AVCVSLLGAS AISPRPLNLI QFSQLIQCAN KGKRATYHYM DYGCYCSKGG
     SGTPVDALDR CCKTHDDCYG QAEKKGCFPL LSLYNFACFP GAPQCGKGNT CQRFVCACDL
     KAALCFAKSP YNNNYNIDIK KKCQTLIYMR LQTQ