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1plf

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[[Image:1plf.gif|left|200px]]
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{{STRUCTURE_1plf| PDB=1plf | SCENE= }}
{{STRUCTURE_1plf| PDB=1plf | SCENE= }}
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'''THE THREE-DIMENSIONAL STRUCTURE OF BOVINE PLATELET FACTOR 4 AT 3.0 ANGSTROMS RESOLUTION'''
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===THE THREE-DIMENSIONAL STRUCTURE OF BOVINE PLATELET FACTOR 4 AT 3.0 ANGSTROMS RESOLUTION===
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==Overview==
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Platelet factor 4 (PF4), which is released by platelets during coagulation, binds very tightly to negatively charged oligosaccharides such as heparin. To date, six other proteins are known that are homologous in sequence with PF4 but have quite different functions. The structure of a tetramer of bovine PF4 complexed with one Ni(CN)4(2-) molecule has been determined at 3.0 A resolution and refined to an R factor of 0.28. The current model contains residues 24-85, no solvent, and one overall temperature factor. Residues 1-13, which carried an oligosaccharide chain, were removed with elastase to induce crystallization; residues 14-23 and presumably 86-88 are disordered in the electron density map. Because no heavy atom derivative was isomorphous with the native crystals, the complex of PF4 with one Ni(CN)4(2-) molecule was solved using a single, highly isomorphous Pt(CN)4(2-) derivative and the iterative, single isomorphous replacement method. The secondary structure of the PF4 subunit, from amino- to carboxyl-terminal end, consists of an extended loop, three strands of antiparallel beta-sheet arranged in a Greek key, and one alpha-helix. The tetramer contains two extended, six-stranded beta-sheets, each formed by two subunits, which are arranged back-to-back to form a "beta-bilayer" structure with two buried salt bridges sandwiched in the middle. The carboxyl-terminal alpha-helices, which contain lysine residues that are thought to be intimately involved in binding heparin, are arranged as antiparallel pairs on the surface of each extended beta-sheet.
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(as it appears on PubMed at http://www.pubmed.gov), where 2914894 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2914894}}
==About this Structure==
==About this Structure==
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[[Category: Edwards, B F.P.]]
[[Category: Edwards, B F.P.]]
[[Category: Platelet factor]]
[[Category: Platelet factor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:13:24 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 16:11:20 2008''

Revision as of 13:11, 29 July 2008

Image:1plf.png

Template:STRUCTURE 1plf

THE THREE-DIMENSIONAL STRUCTURE OF BOVINE PLATELET FACTOR 4 AT 3.0 ANGSTROMS RESOLUTION

Template:ABSTRACT PUBMED 2914894

About this Structure

1PLF is a Single protein structure of sequence from Bos taurus. Full crystallographic information is available from OCA.

Reference

The three-dimensional structure of bovine platelet factor 4 at 3.0-A resolution., St Charles R, Walz DA, Edwards BF, J Biol Chem. 1989 Feb 5;264(4):2092-9. PMID:2914894

Page seeded by OCA on Tue Jul 29 16:11:20 2008

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