1bht
From Proteopedia
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'''NK1 FRAGMENT OF HUMAN HEPATOCYTE GROWTH FACTOR''' | '''NK1 FRAGMENT OF HUMAN HEPATOCYTE GROWTH FACTOR''' | ||
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[[Category: Ultsch, M H.]] | [[Category: Ultsch, M H.]] | ||
[[Category: Vos, A M.De.]] | [[Category: Vos, A M.De.]] | ||
| - | [[Category: | + | [[Category: C-met receptor angonist/ antagonist]] |
| - | [[Category: | + | [[Category: Growth factor]] |
| - | [[Category: | + | [[Category: Heparin-binding domain]] |
| - | [[Category: | + | [[Category: Kringle]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 11:31:52 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 08:31, 2 May 2008
NK1 FRAGMENT OF HUMAN HEPATOCYTE GROWTH FACTOR
Overview
BACKGROUND: Hepatocyte growth factor (HGF) is a mitogen for hepatocytes and has also been implicated as an epithelial morphogen in tumor invasion. HGF activates its specific cellular receptor, c-met, through an aggregation mechanism potentiated by heparan sulfate glycosaminoglycans. HGF consists of an N-terminal (N) domain, four kringle domains (the first of which carries receptor-binding determinants), and an inactive serine-protease-like domain. NK1, a naturally occurring fragment of HGF, acts as an antagonist of HGF in the absence of heparin. RESULTS: The N domain of NK1 consists of a central five-stranded antiparallel beta sheet flanked by an alpha helix and a two-stranded beta ribbon. The overall N domain structure in the context of the NK1 fragment is similar to the structure of the isolated domain; two lysines and an arginine residue coordinate a bound sulfate ion. The NK1 kringle domain is homologous to kringle 4 from plasminogen, except that the lysine-binding pocket is altered by the insertion of a glycine residue. Here, a HEPES molecule is bound in the pocket. The asymmetric unit of the crystal contains a 'head-to-tail' NK1 dimer. We use this dimer to propose a model of the NK2 fragment of HGF. CONCLUSIONS: A cluster of exposed lysine and arginine residues in or near the hairpin-loop region of the N domain might form part of the NK1 heparin-binding site. In our NK2 model, both kringle domains pack loosely against the N domain, and a long, positively charged groove lines the interface. This groove might be involved in glycosaminoglycan binding. The HGF receptor-binding determinants are clustered near the binding pocket of the first kringle domain, opposite the N domain.
About this Structure
1BHT is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structure of the NK1 fragment of human hepatocyte growth factor at 2.0 A resolution., Ultsch M, Lokker NA, Godowski PJ, de Vos AM, Structure. 1998 Nov 15;6(11):1383-93. PMID:9817840 Page seeded by OCA on Fri May 2 11:31:52 2008
