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

Endocrinology. 2001 May;142(5):2147. doi: 10.1210/endo.142.5.8284.

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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amino Acid Sequence
  • Humans
  • Insulin-Like Growth Factor Binding Protein 3 / chemistry
  • Insulin-Like Growth Factor Binding Protein 3 / metabolism
  • Insulin-Like Growth Factor Binding Protein 5 / chemistry
  • Insulin-Like Growth Factor Binding Protein 5 / metabolism*
  • Molecular Sequence Data
  • Mutagenesis
  • Protein Subunits
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / metabolism
  • Structure-Activity Relationship

Substances

  • Insulin-Like Growth Factor Binding Protein 3
  • Insulin-Like Growth Factor Binding Protein 5
  • Protein Subunits
  • Recombinant Proteins