3SBA_HEMHA
ID 3SBA_HEMHA Reviewed; 37 AA.
AC P0DQH3;
DT 05-JUN-2019, integrated into UniProtKB/Swiss-Prot.
DT 05-JUN-2019, sequence version 1.
DT 25-MAY-2022, entry version 9.
DE RecName: Full=Hemextin A {ECO:0000303|PubMed:16204244};
DE AltName: Full=Hemachatus extrinsic tenase inhibitor A {ECO:0000303|PubMed:16204244};
DE Flags: Fragment;
OS Hemachatus haemachatus (Rinkhals) (Sepedon haemachatus).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC Serpentes; Colubroidea; Elapidae; Elapinae; Hemachatus.
OX NCBI_TaxID=8626;
RN [1]
RP PROTEIN SEQUENCE, SUBCELLULAR LOCATION, FUNCTION, MASS SPECTROMETRY, AND
RP SUBUNIT.
RC TISSUE=Venom;
RX PubMed=16204244; DOI=10.1074/jbc.m508987200;
RA Banerjee Y., Mizuguchi J., Iwanaga S., Kini R.M.;
RT "Hemextin AB complex, a unique anticoagulant protein complex from
RT Hemachatus haemachatus (African Ringhals cobra) venom that inhibits clot
RT initiation and factor VIIa activity.";
RL J. Biol. Chem. 280:42601-42611(2005).
RN [2]
RP ERRATUM OF PUBMED:16204244.
RA Banerjee Y., Mizuguchi J., Iwanaga S., Kini R.M.;
RL J. Biol. Chem. 281:22427-22427(2006).
RN [3]
RP CRYSTALLIZATION.
RX PubMed=17671372; DOI=10.1107/s1744309107034239;
RA Banerjee Y., Kumar S., Jobichen C., Kini R.M.;
RT "Crystallization and preliminary X-ray diffraction analysis of hemextin A:
RT a unique anticoagulant protein from Hemachatus haemachatus venom.";
RL Acta Crystallogr. F 63:701-703(2007).
RN [4]
RP SUBUNIT.
RC TISSUE=Venom;
RX PubMed=17704148; DOI=10.1529/biophysj.106.100164;
RA Banerjee Y., Lakshminarayanan R., Vivekanandan S., Anand G.S.,
RA Valiyaveettil S., Kini R.M.;
RT "Biophysical characterization of anticoagulant hemextin AB complex from the
RT venom of snake Hemachatus haemachatus.";
RL Biophys. J. 93:3963-3976(2007).
CC -!- FUNCTION: Hemextin A (monomer): exhibits mild anticoagulant activity.
CC It specifically inhibits the activation of FX (F10) by the TF-FVIIa
CC complex (extrinsic tenase complex (ETC)) by non-competitively
CC inhibiting the enzymatic activity of FVIIa.
CC {ECO:0000269|PubMed:16204244}.
CC -!- FUNCTION: Hemextin AB complex: specifically inhibits the activation of
CC FX (F10) by the TF-FVIIa complex (extrinsic tenase complex (ETC))
CC (IC(50)= 100 nM, Ki=25 nM) by non-competitively inhibiting the
CC enzymatic activity of FVIIa. {ECO:0000269|PubMed:16204244}.
CC -!- SUBUNIT: Heterotetramer composed of two A and two B chains; non-
CC covalently linked. Does not exists as a complex in the crude venom.
CC {ECO:0000269|PubMed:16204244, ECO:0000269|PubMed:17704148}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:16204244}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305}.
CC -!- PTM: May contain several disulfide bonds. {ECO:0000305}.
CC -!- MASS SPECTROMETRY: Mass=6835.00; Method=Electrospray;
CC Evidence={ECO:0000269|PubMed:16204244};
CC -!- SIMILARITY: Belongs to the snake three-finger toxin family. Short-chain
CC subfamily. Type IB cytotoxin sub-subfamily. {ECO:0000305}.
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DR AlphaFoldDB; P0DQH3; -.
DR SMR; P0DQH3; -.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR Gene3D; 2.10.60.10; -; 1.
DR InterPro; IPR003572; Cytotoxin_Cobra.
DR InterPro; IPR045860; Snake_toxin-like_sf.
DR PRINTS; PR00282; CYTOTOXIN.
DR SUPFAM; SSF57302; SSF57302; 1.
PE 1: Evidence at protein level;
KW Blood coagulation cascade inhibiting toxin; Direct protein sequencing;
KW Disulfide bond; Hemostasis impairing toxin; Secreted; Toxin.
FT CHAIN 1..>37
FT /note="Hemextin A"
FT /evidence="ECO:0000269|PubMed:16204244"
FT /id="PRO_0000447301"
FT NON_TER 37
SQ SEQUENCE 37 AA; 4237 MW; BBFCE778D8D309BD CRC64;
LKCKNKLVPF LSKTCPEGKN LCYKMTLKKV TPKIKRG