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PDBsum entry 1jwi
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Contents |
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* Residue conservation analysis
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References listed in PDB file
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Key reference
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Title
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Crystal structure of bitiscetin, A von willebrand factor-Dependent platelet aggregation inducer.
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Authors
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S.Hirotsu,
H.Mizuno,
K.Fukuda,
M.C.Qi,
T.Matsui,
J.Hamako,
T.Morita,
K.Titani.
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Ref.
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Biochemistry, 2001,
40,
13592-13597.
[DOI no: ]
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PubMed id
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Abstract
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Bitiscetin, a C-type lectin-like protein isolated from the venom of the snake
Bitis arientans, promotes the interactions between plasma von Willebrand factor
(VWF) and platelet membrane glycoprotein Ib (GPIb) to induce platelet
aggregation. We report here the crystal structure of bitiscetin at 2.0 A
resolution. The overall fold is similar to those of coagulation factor
IX/X-binding protein (IX/X-bp) and flavocetin-A (a GPIb-binding protein),
although these three proteins are functionally distinct from one another. The
characteristic property determining target recognition is explained mainly by
the differences in the surface potential on the central concave surface. A
negatively charged patch on the surface of bitiscetin is a candidate for the
site of binding to the positively charged surface of the VWF A1 domain, as shown
in the case of another platelet aggregation inducer, botrocetin. However, a
positively charged patch near the central concave surface is unique for
bitiscetin and suggests that it is the binding site for the negatively charged
surface of the VWF A3 domain. Thus, the interactions accounting for VWF
activation by bitiscetin possibly involve both the A1 and A3 domains of VWF,
indicating a specific mechanism of VWF activation by bitiscetin.
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