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    Structure-function studies of an IGF-I analogue that can be chemically cleaved to a two-chain mini-IGF-I

    Geddes, S. and Holst, P. and Grotzinger, J. and Gill, R. and Nugent, P. and De Meyts, P. and Wollmer, A. and Wood, S.P. and Pitts, James (2001) Structure-function studies of an IGF-I analogue that can be chemically cleaved to a two-chain mini-IGF-I. Protein Engineering, Design and Selection 14 (1), pp. 61-65. ISSN 0269-2139.

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    The structure and biological activities of two disulphide isomers of a C-region deletion mutant of insulin-like growth factor-I (IGF-I) which has an Asn–Gly link engineered at the junction of the A- and B-regions were studied before and after chemical cleavage. Circular dichroism (CD) spectra and binding affinity to IGF binding protein 3 (IGFBP3) indicated that the treatment with hydroxylamine did not disrupt the overall tertiary fold of the hormones. Cleavage restored some binding affinity for the IGF-I receptor in both isomers and weakly restored the ability to stimulate incorporation of tritiated thymidine into DNA in NIH 3T3 fibroblasts transfected with the human IGF-I receptor. Cleavage also restored metabolic capacity, as measured by the ability of the isomers to promote lipogenesis in isolated rat adipocytes through the insulin receptor. These results are consistent with the theory that binding of IGF-I to the IGF-I receptor requires a conformational change similar to that involved in insulin binding the insulin receptor. The weak affinity for the IGF-I receptor after cleavage is consistent with the belief that residues in the C-region interact with the IGF-I receptor. This structural difference between insulin and IGF-I gives each a higher binding affinity for its own receptor.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences
    Depositing User: Sarah Hall
    Date Deposited: 14 May 2019 08:37
    Last Modified: 02 Aug 2023 17:51


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