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Publications [#113178] of Harold P. Erickson

Papers Published

  1. S Denda, U Müller, KL Crossin, HP Erickson, LF Reichardt, Utilization of a soluble integrin-alkaline phosphatase chimera to characterize integrin alpha 8 beta 1 receptor interactions with tenascin: murine alpha 8 beta 1 binds to the RGD site in tenascin-C fragments, but not to native tenascin-C., Biochemistry, UNITED STATES, vol. 37 no. 16 (April, 1998), pp. 5464-74, ISSN 0006-2960
    (last updated on 2009/02/12)

    Abstract:
    The integrin alpha 8 beta 1 has been reported to bind to fibronectin, vitronectin, and tenascin-C in cell adhesion or neurite outgrowth assays. Here, we describe cDNA cloning of the murine alpha 8 subunit, purification of a recombinant soluble heterodimer consisting of the extracellular domains of the murine alpha 8 and beta1 subunits, and development of a sensitive binding assay using a modified form of this heterodimer fused to alkaline phosphatase (AP). In binding assays, the purified alpha 8 beta 1-AP chimera exhibited the same divalent ion requirements for activation and binding specificity as cell surface alpha 8 beta 1: in the presence of Mn2+ it bound to fibronectin and vitronectin in an RGDS-peptide inhibitable manner. Contrary to previous reports, we found no evidence that alpha 8 beta 1, expressed on K562 cells or as an AP chimera, interacts strongly with native tenascin-C. In binding, adhesion, and spreading assays, significant interactions were observed only to short fragments of tenascin-C containing the third fibronectin type III repeat which contains an RGD sequence. Full length tenascin-C and longer fragments containing this repeat did not appear to serve as ligands, implying that the RGD site in native tenascin-C is a cryptic binding site for this integrin, exposed by removal of adjacent domains. Soluble integrin-AP chimeras should be generally useful for identifying and characterizing integrin interactions with ligands.

    Keywords:
    Alkaline Phosphatase • Amino Acid Sequence • Animals • Base Sequence • Binding Sites • Cell Adhesion • Chickens • Cloning, Molecular • Dimerization • Humans • Integrin alpha Chains* • Integrins • Mice • Molecular Sequence Data • Oligopeptides • Peptide Fragments • Protein Binding • Recombinant Fusion Proteins • Repetitive Sequences, Nucleic Acid • Solubility • Tenascin • chemistry • genetics • genetics* • isolation & purification • metabolism • metabolism*


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