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1gwb

From Proteopedia

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[[Image:1gwb.gif|left|200px]]
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{{STRUCTURE_1gwb| PDB=1gwb | SCENE= }}
{{STRUCTURE_1gwb| PDB=1gwb | SCENE= }}
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'''STRUCTURE OF GLYCOPROTEIN 1B'''
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===STRUCTURE OF GLYCOPROTEIN 1B===
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==Overview==
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Glycoprotein Ib (GPIb) is a platelet receptor with a critical role in mediating the arrest of platelets at sites of vascular damage. GPIb binds to the A1 domain of von Willebrand factor (vWF-A1) at high blood shear, initiating platelet adhesion and contributing to the formation of a thrombus. To investigate the molecular basis of GPIb regulation and ligand binding, we have determined the structure of the N-terminal domain of the GPIb(alpha) chain (residues 1-279). This structure is the first determined from the cell adhesion/signaling class of leucine-rich repeat (LRR) proteins and reveals the topology of the characteristic disulfide-bonded flanking regions. The fold consists of an N-terminal beta-hairpin, eight leucine-rich repeats, a disulfide-bonded loop, and a C-terminal anionic region. The structure also demonstrates a novel LRR motif in the form of an M-shaped arrangement of three tandem beta-turns. Negatively charged binding surfaces on the LRR concave face and anionic region indicate two-step binding kinetics to vWF-A1, which can be regulated by an unmasking mechanism involving conformational change of a key loop. Using molecular docking of the GPIb and vWF-A1 crystal structures, we were also able to model the GPIb.vWF-A1 complex.
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(as it appears on PubMed at http://www.pubmed.gov), where 12087105 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12087105}}
==About this Structure==
==About this Structure==
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[[Category: Transmembrane]]
[[Category: Transmembrane]]
[[Category: Von willebrand disease]]
[[Category: Von willebrand disease]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:05:28 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:12:34 2008''

Revision as of 03:12, 1 July 2008

Image:1gwb.png

Template:STRUCTURE 1gwb

STRUCTURE OF GLYCOPROTEIN 1B

Template:ABSTRACT PUBMED 12087105

About this Structure

1GWB is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of the platelet glycoprotein Ib(alpha) N-terminal domain reveals an unmasking mechanism for receptor activation., Uff S, Clemetson JM, Harrison T, Clemetson KJ, Emsley J, J Biol Chem. 2002 Sep 20;277(38):35657-63. Epub 2002 Jun 26. PMID:12087105

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