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1qql

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[[Image:1qql.gif|left|200px]]
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[[Image:1qql.png|left|200px]]
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{{STRUCTURE_1qql| PDB=1qql | SCENE= }}
{{STRUCTURE_1qql| PDB=1qql | SCENE= }}
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'''THE CRYSTAL STRUCTURE OF FIBROBLAST GROWTH FACTOR 7/1 CHIMERA'''
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===THE CRYSTAL STRUCTURE OF FIBROBLAST GROWTH FACTOR 7/1 CHIMERA===
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==Overview==
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Stromal cell-derived FGF-7 binds and activates only the resident FGFR2IIIb in epithelial cells while FGF-1 and FGF-2 exhibit a broader interaction with multiple isoforms of FGFR. Here we report the structure of FGF-7 that has been solved to 3.1 A resolution by molecular replacement with the structure of a dual function chimera of FGF-7 and FGF-1 (FGF-7/1) which was resolved to 2.3 A. Comparison of the FGF-7 structure to that of FGF-1 and FGF-2 revealed the strongly conserved Calpha backbone among the three FGF polypeptides and the surface hydrophobic patch that forms the primary receptor-binding domain. In contrast, a decrease and dispersion of the positive surface charge density characterized the heparin-binding domain of FGF-7 defined by homology to that of FGF-1 and FGF-2 in complexes with heparin. A simple heparin hexasaccharide that cocrystallized with FGF-1 and FGF-2 and protected both against protease in solution failed to exhibit the same properties with FGF-7. In contrast to FGF-1 and FGF-2, protection of FGF-7 was enhanced by heparin oligosaccharides of increased length with those exhibiting a 3-O-sulfate being the most effective. Protection of FGF-7 required interaction with specifically the fraction of crude heparin retained on antithrombin affinity columns. Conversely, heparin enriched by affinity for immobilized FGF-7 exhibited anti-factor Xa activity similar to that purified on an antithrombin affinity matrix. In contrast, an FGF-1 affinity matrix enriched the fraction of crude heparin with low anti-factor Xa activity. The results provide a structural basis to suggest that the unique FGF-7 heparin-binding (HB) domain underlies a specific restriction in respect to composition and length of the heparan sulfate motif that may impact specificity of localization, stability, and trafficking of FGF-7 in the microenvironment, and formation and activation of the FGFR2IIIb kinase signaling complex in epithelial cells.
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(as it appears on PubMed at http://www.pubmed.gov), where 11724555 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11724555}}
==About this Structure==
==About this Structure==
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[[Category: Ye, S.]]
[[Category: Ye, S.]]
[[Category: Beta-trefoil]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:35:28 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:28:37 2008''

Revision as of 23:28, 27 July 2008

Image:1qql.png

Template:STRUCTURE 1qql

THE CRYSTAL STRUCTURE OF FIBROBLAST GROWTH FACTOR 7/1 CHIMERA

Template:ABSTRACT PUBMED 11724555

About this Structure

1QQL is a Single protein structure of sequence from Rattus norvegicus + homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for interaction of FGF-1, FGF-2, and FGF-7 with different heparan sulfate motifs., Ye S, Luo Y, Lu W, Jones RB, Linhardt RJ, Capila I, Toida T, Kan M, Pelletier H, McKeehan WL, Biochemistry. 2001 Dec 4;40(48):14429-39. PMID:11724555

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