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    The interactions of hepatocyte growth factor/scatter factor and its NK1 and NK2 variants with glycosaminoglycans using a modified gel mobility shift assay. Elucidation of the minimal size of binding and activatory oligosaccharides.

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    Authors
    Lyon, Malcolm
    Deakin, Jon A
    Lietha, Daniel
    Gherardi, Ermanno
    Gallagher, John T
    Affiliation
    Cancer Research UK, University of Manchester, Christie Hospital National Health Service Trust, Wilmslow Road, M20 4BX. MLyon@picr.man.ac.uk
    Issue Date
    2004-10-15
    
    Metadata
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    Abstract
    Full-length hepatocyte growth factor/scatter factor interacts with both heparan and dermatan sulfates and is critically dependent upon them as cofactors for activation of the tyrosine kinase receptor Met. Two C-terminally truncated variants (NK1 and NK2) of this growth factor also occur naturally. Their glycosaminoglycan binding properties are not clear. We have undertaken a comparative study of the heparan/dermatan sulfate binding characteristics of all three proteins. This has entailed the development of a modified gel mobility shift assay, utilizing fluorescence end-tagged oligosaccharides, that is also widely applicable to the analysis of many glycosaminoglycan-protein interactions. Using this we have shown that all three hepatocyte growth factor/scatter factor variants share identical heparan/dermatan sulfate binding properties and that both glycosaminoglycans occupy the same binding site. The minimal size of the oligosaccharide that binds with high affinity in all cases is a tetrasaccharide from heparan sulfate but a hexasaccharide from dermatan sulfate. These findings demonstrate that functional glycosaminoglycan binding is restricted to a binding site situated solely within the small N-terminal domain. The same minimal size fractions are also able to promote hepatocyte growth factor/scatter factor-mediated activation of Met and consequent downstream signaling in the glycosaminoglycan-deficient Chinese hamster ovary pgsA-745 cells. A covalent complex of heparan sulfate tetrasaccharide with monovalent growth factor is also active. The binding and activity of tetrasaccharides put constraints upon the possible interactions and molecular geometry within the ternary signaling complex.
    Citation
    The interactions of hepatocyte growth factor/scatter factor and its NK1 and NK2 variants with glycosaminoglycans using a modified gel mobility shift assay. Elucidation of the minimal size of binding and activatory oligosaccharides. 2004, 279 (42):43560-7 J. Biol. Chem.
    Journal
    The Journal of Biological Chemistry
    URI
    http://hdl.handle.net/10541/78398
    DOI
    10.1074/jbc.M408510200
    PubMed ID
    15292253
    Type
    Article
    Language
    en
    ISSN
    0021-9258
    ae974a485f413a2113503eed53cd6c53
    10.1074/jbc.M408510200
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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