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How many insulin-like growth factor binding proteins?

C Collet1, J Candy

  • 1Centre for Molecular Biotechnology, School of Life Sciences, Queensland University of Technology, Brisbane, Australia. c.collet@qut.edu.au

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|August 15, 1998
PubMed
Summary
This summary is machine-generated.

While Mac25, CTGF, nov, and Cyr61 share a domain with insulin-like growth factor binding proteins (IGFBPs), they bind ligands weakly. This suggests two other IGFBPs may exist, distinct from these candidates.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Mac25, connective tissue growth factor (CTGF), nov-oncogene, and Cyr61 have been proposed as insulin-like growth factor binding proteins (IGFBPs).
  • These candidate proteins exhibit low-affinity binding to IGF ligands and share sequence similarity with known IGFBPs primarily in a single N-terminal cysteine-rich domain (CRD).

Purpose of the Study:

  • To evaluate the classification of Mac25, CTGF, nov, and Cyr61 as IGFBPs.
  • To explore the evolutionary origins and functional implications of the CRD in extracellular matrix proteins.
  • To identify potential novel IGFBPs based on genetic linkage data.

Main Methods:

  • Sequence similarity analysis comparing candidate proteins with known IGFBPs.
  • Examination of the conserved cysteine-rich domain (CRD) across various species and protein families.
  • Analysis of linkage relationships of known IGFBPs to infer the existence of new members.

Main Results:

  • Candidate proteins (Mac25, CTGF, nov, Cyr61) demonstrate very low affinity for IGF ligands, questioning their IGFBP status.
  • Sequence homology to recognized IGFBPs is limited to the N-terminal CRD.
  • The CRD is present in diverse extracellular matrix proteins, suggesting modular evolution via exon shuffling.
  • Linkage data for known IGFBPs suggest the potential existence of two additional, undiscovered IGFBPs.

Conclusions:

  • Mac25, CTGF, nov, and Cyr61 are unlikely to be functional IGFBPs due to weak ligand binding.
  • The conserved CRD highlights a modular protein architecture potentially shaped by exon shuffling.
  • Further investigation is warranted to identify the two putative IGFBPs suggested by genetic linkage data.