Structural characterization of EMS16, an Antagonist of collagen receptor (GPIa/IIa) from the venom of Echis multisquamatusHorii, K., Okuda, D., Morita, T., Mizuno, H.
(2003) Biochemistry 42: 12497-12502
- PubMed: 14580195
- DOI: 10.1021/bi034890h
- Also Cited By: 1V7P
- PubMed Abstract:
- Characterization and Preliminary Crystallographic Studies of EMS16, an Antagonist of Collagen Receptor (GPIa/IIa) from the Venom of Echis multisquamatus
Okuda, D.,Horii, K.,Mizuno, H.,Morita, T.
(2003) J.BIOCHEM.(TOKYO) 134: 19
- Isolation and characterization of EMS16, a C-lectin type protein from Echis multisquamatus venom, a potent and selective inhibitor of the alpha2beta1 integrin
Marcinkiewicz, C.,Lobb, R.R.,Marcinkiewicz, M.M.,Daniel, J.L.,Smith, J.B.,Dangelmaier, C.,Weinreb, P.H.,Beacham, D.A.,Niewiarowski, S.
(2000) Biochemistry 39: 9859
Snake venoms contain a number of hemostatically active C-type lectin-like proteins (CLPs), which affect the blood coagulation system, endothelial cells, and platelets. CLPs have broad similarities in structure and possess distinct biological function ...
Snake venoms contain a number of hemostatically active C-type lectin-like proteins (CLPs), which affect the blood coagulation system, endothelial cells, and platelets. CLPs have broad similarities in structure and possess distinct biological functions. EMS16, a CLP from Echis multisquamatus venom, which is a potent and selective inhibitor of the collagen receptor, glycoprotein Ia/IIa (integrin alpha2beta1), has been used in the present study to examine structure-function relationships in venom CLPs by X-ray crystallography. The structure of EMS16, determined at a resolution of 1.9 A, revealed a heterodimer involved with domain swapping of the central loop as observed in the structures of other CLPs. A part of the glycan was observed and identified as N-acetyl-D-glucosamine (GlcNAc) in the electron density map at Asn21 of subunit B, an expected glycosylation site. EMS16 had a unique, positively charged electrostatic potential patch on the concave surface that may qualify as a site for interaction with the I-domain of the glycoprotein Ia/IIa.
Department of Biochemistry, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan.