Mutagenesis of basic amino acids in the carboxyl-terminal region of insulin-like growth factor binding protein-5 affects acid-labile subunit binding

Endocrinology
S M FirthR C Baxter

Abstract

Like insulin-like growth factor binding protein-3 (IGFBP-3), IGFBP-5 was recently shown to form ternary complexes with insulin-like growth factor (IGF) and the acid-labile subunit (ALS). Previous studies using IGFBP-5/IGFBP-6 chimeric proteins have identified major and minor ALS binding sites in the carboxyl-terminal and central regions, respectively of IGFBP-5. We now report that ALS binds to IGFBP-3 (K(a) = 1.1 +/- 0.1 liters/nmol) and IGFBP-5 (K(a) = 1.8 +/- 0.5 liters/nmol) with similar binding affinities. Using site-specific mutants, we have identified residues K(211)/R(214)/K(217)/R(218) within the carboxyl-terminal region of IGFBP-5 as being essential for ALS binding. Mutation of K(134)R(136) or K(138)K(139) in the central region of IGFBP-5 resulted in a small decrease in ALS binding.

Citations

May 24, 2013·Journal of Cell Communication and Signaling·Robert C Baxter
Dec 6, 2002·Endocrine Reviews·Sue M Firth, Robert C Baxter
Jun 5, 2003·The Journal of Biological Chemistry·Alison J ButtRobert C Baxter
May 15, 2007·Molecular & Cellular Proteomics : MCP·Mark E GrahamRobert C Baxter

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