PA2HJ_TRIST
ID PA2HJ_TRIST Reviewed; 122 AA.
AC Q6H3D1;
DT 05-SEP-2012, integrated into UniProtKB/Swiss-Prot.
DT 19-JUL-2004, sequence version 1.
DT 25-MAY-2022, entry version 64.
DE RecName: Full=Basic phospholipase A2 homolog CTs-K49b {ECO:0000303|PubMed:12959640};
DE Short=svPLA2 homolog;
OS Trimeresurus stejnegeri (Chinese green tree viper) (Viridovipera
OS stejnegeri).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC Serpentes; Colubroidea; Viperidae; Crotalinae; Trimeresurus.
OX NCBI_TaxID=39682;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA], PROTEIN SEQUENCE OF 1-23, FUNCTION, MASS
RP SPECTROMETRY, AND SUBCELLULAR LOCATION.
RC STRAIN=Chinese; TISSUE=Venom, and Venom gland;
RX PubMed=12959640; DOI=10.1042/bj20030818;
RA Tsai I.-H., Wang Y.-M., Chen Y.-H., Tsai T.-S., Tu M.-C.;
RT "Venom phospholipases A2 of bamboo viper (Trimeresurus stejnegeri):
RT molecular characterization, geographic variations and evidence of multiple
RT ancestries.";
RL Biochem. J. 377:215-223(2004).
CC -!- FUNCTION: Snake venom phospholipase A2 homolog that lacks catalytic
CC activity (PubMed:12959640). It shows myotoxic and weak anticoagulant
CC activities (PubMed:12959640). A model of myotoxic mechanism has been
CC proposed: an apo Lys49-PLA2 is activated by the entrance of a
CC hydrophobic molecule (e.g. fatty acid) at the hydrophobic channel of
CC the protein leading to a reorientation of a monomer (By similarity).
CC This reorientation causes a transition between 'inactive' to 'active'
CC states, causing alignment of C-terminal and membrane-docking sites
CC (MDoS) side-by-side and putting the membrane-disruption sites (MDiS) in
CC the same plane, exposed to solvent and in a symmetric position for both
CC monomers (By similarity). The MDoS region stabilizes the toxin on
CC membrane by the interaction of charged residues with phospholipid head
CC groups (By similarity). Subsequently, the MDiS region destabilizes the
CC membrane with penetration of hydrophobic residues (By similarity). This
CC insertion causes a disorganization of the membrane, allowing an
CC uncontrolled influx of ions (i.e. calcium and sodium), and eventually
CC triggering irreversible intracellular alterations and cell death (By
CC similarity). {ECO:0000250|UniProtKB:I6L8L6,
CC ECO:0000269|PubMed:12959640}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:12959640}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC {ECO:0000305|PubMed:12959640}.
CC -!- MASS SPECTROMETRY: Mass=13771; Method=Electrospray;
CC Evidence={ECO:0000269|PubMed:12959640};
CC -!- SIMILARITY: Belongs to the phospholipase A2 family. Group II subfamily.
CC K49 sub-subfamily. {ECO:0000305}.
CC -!- CAUTION: Does not bind calcium as one of the calcium-binding sites is
CC lost (Asp->Lys in position 48, which corresponds to 'Lys-49' in the
CC current nomenclature). {ECO:0000305}.
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DR EMBL; AY211938; AAP48896.1; -; mRNA.
DR AlphaFoldDB; Q6H3D1; -.
DR SMR; Q6H3D1; -.
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:InterPro.
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:InterPro.
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 Blood coagulation cascade inhibiting toxin; Direct protein sequencing;
KW Disulfide bond; Hemostasis impairing toxin; Myotoxin; Secreted; Toxin.
FT CHAIN 1..122
FT /note="Basic phospholipase A2 homolog CTs-K49b"
FT /evidence="ECO:0000305|PubMed:12959640"
FT /id="PRO_0000419083"
FT REGION 105..117
FT /note="Important for membrane-damaging activities in
FT eukaryotes and bacteria; heparin-binding"
FT /evidence="ECO:0000250|UniProtKB:P24605"
FT SITE 105
FT /note="Important residue of the cationic membrane-docking
FT site (MDoS)"
FT /evidence="ECO:0000250|UniProtKB:I6L8L6"
FT SITE 108
FT /note="Important residue of the cationic membrane-docking
FT site (MDoS)"
FT /evidence="ECO:0000250|UniProtKB:I6L8L6"
FT SITE 111
FT /note="Hydrophobic membrane-disruption site (MDiS)"
FT /evidence="ECO:0000250|UniProtKB:I6L8L6"
FT SITE 112
FT /note="Cationic membrane-docking site (MDoS)"
FT /evidence="ECO:0000250|UniProtKB:I6L8L6"
FT SITE 117
FT /note="Cationic membrane-docking site (MDoS)"
FT /evidence="ECO:0000250|UniProtKB:I6L8L6"
FT DISULFID 26..115
FT /evidence="ECO:0000250|UniProtKB:Q90249"
FT DISULFID 28..44
FT /evidence="ECO:0000250|UniProtKB:Q90249"
FT DISULFID 43..95
FT /evidence="ECO:0000250|UniProtKB:Q90249"
FT DISULFID 49..122
FT /evidence="ECO:0000250|UniProtKB:Q90249"
FT DISULFID 50..88
FT /evidence="ECO:0000250|UniProtKB:Q90249"
FT DISULFID 75..86
FT /evidence="ECO:0000250|UniProtKB:Q90249"
SQ SEQUENCE 122 AA; 13785 MW; 7C70FEC2B9A6012F CRC64;
SVIELGKMIF QETGKNPATS YGLYGCNCGP GGRRKPKDAT DRCCFLHKCC YKKLTDCDPI
RDSYSYSWVN KAIVCGGDDP HLKEMCECDK AMAICFRENL DTYDKKKKIT LKLSCKKTSE
QC
