1gp9
A New Crystal Form of the Nk1 Splice Variant of Hgf/Sf Demonstrates Extensive Hinge Movement and Suggests that the Nk1 Dimer Originates by Domain Swapping
Structural highlights
DiseaseHGF_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] FunctionHGF_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 PubMedNK1 is a splice variant of the polypeptide growth factor HGF/SF that consists of the N terminal (N) and first kringle (K) domains and retains receptor binding and signalling. While NK1 behaves as a monomer in solution, two independent crystallographic structures have previously shown an identical, tightly packed dimer. Here we report a novel orthorhombic crystal form of NK1 at 2.5 A resolution in which four NK1 protomers are packed in two distinct dimers in the asymmetric unit. Although the basic architecture of the new NK1 dimers is similar to the two described earlier, the new crystal form demonstrates extensive hinge movement between the N and K domain that leads to re-orientation of the receptor-binding sites. The hinge bending is evidence of the paucity of strong interactions between domains within the protomer, in contrast to the extensive interactions between protomers in the dimer. These observations are consistent with domain swapping in the dimer, such that the interdomain interactions of the monomer are replaced by equivalent interprotomer interactions in the dimer and offer a route for protein engineering of NK1 variants which may act as receptor antagonists. A new crystal form of the NK1 splice variant of HGF/SF demonstrates extensive hinge movement and suggests that the NK1 dimer originates by domain swapping.,Watanabe K, Chirgadze DY, Lietha D, de Jonge H, Blundell TL, Gherardi E J Mol Biol. 2002 May 31;319(2):283-8. PMID:12051906[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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