1nk1
From Proteopedia
NK1 FRAGMENT OF HUMAN HEPATOCYTE GROWTH FACTOR/SCATTER FACTOR (HGF/SF) AT 2.5 ANGSTROM RESOLUTION
Structural highlights
Disease[HGF_HUMAN] Defects in HGF are the cause of deafness autosomal recessive type 39 (DFNB39) [MIM:608265]. A form of profound prelingual sensorineural hearing loss. Sensorineural deafness results from damage to the neural receptors of the inner ear, the nerve pathways to the brain, or the area of the brain that receives sound information.[1] Function[HGF_HUMAN] Potent mitogen for mature parenchymal hepatocyte cells, seems to be a hepatotrophic factor, and acts as a growth factor for a broad spectrum of tissues and cell types. Activating ligand for the receptor tyrosine kinase MET by binding to it and promoting its dimerization.[2] [3] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAlthough ligand-induced receptor dimerization is a common prerequisite for receptor activation, the mode by which different growth factors bind their receptors and cause them to dimerize varies considerably. Here we report the crystal structure at 2.5 A resolution of NK1, a receptor-binding fragment and a natural splice variant of hepatocyte growth factor/scatter factor (HGF/SF). NK1 assembles as a homodimer in the asymmetric unit, revealing a novel mode of growth factor dimerization produced by close packing of the N domain of one subunit and the kringle domain of the other, thus bringing the two linkers in close proximity. The structure suggests the presence of a binding site for heparan sulfate chains and a mechanism by which the NK1 dimer may engage two receptor molecules through clusters of amino acids located on each protomer and on opposite surfaces of the homodimer. We also report that short (14-mer) heparin fragments effectively dimerize NK1 in solution, implying that heparan sulfate chains may stabilize the NK1 dimer. These results provide a basis for the agonistic activity of NK1 and have implications for the mechanism of receptor binding of HGF/SF. Crystal structure of the NK1 fragment of HGF/SF suggests a novel mode for growth factor dimerization and receptor binding.,Chirgadze DY, Hepple JP, Zhou H, Byrd RA, Blundell TL, Gherardi E Nat Struct Biol. 1999 Jan;6(1):72-9. PMID:9886295[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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