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Related Experiment Videos

The link proteins

P J Neame1, F P Barry

  • 1Shriners Hospital for Crippled Children, Tampa, Florida.

Experientia
|May 15, 1993
PubMed
Summary
This summary is machine-generated.

Link protein (LP) stabilizes cartilage aggregates by binding hyaluronic acid and aggrecan. Its structure, similar to aggrecan

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Cartilage aggregates are primarily composed of chondroitin-keratan sulfate proteoglycan (aggrecan) and hyaluronic acid (hyaluronan).
  • Link protein (LP) is a glycoprotein crucial for stabilizing these aggregates by bridging hyaluronic acid and aggrecan.

Purpose of the Study:

  • To detail the structure and function of link protein (LP).
  • To explore structure-function relationships of LP by comparing it with related molecules.

Main Methods:

  • Rotary shadowing electron microscopy to estimate aggregate size.
  • Chaotropic dissociation and reassociation studies to understand aggregate stability.
  • Tryptic digestion to isolate and analyze components of the proteoglycan aggregate.

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Main Results:

  • LP significantly enhances the stability and size of proteoglycan aggregates.
  • Tryptic digestion yields a complex of hyaluronic acid, LP, and the aggrecan N-terminal globular domain (HABR).
  • LP and HABR share surprising sequence similarity, divisible into three domains, with C-terminal domains responsible for hyaluronic acid binding.

Conclusions:

  • LP's structure, particularly its immunoglobulin-like N-terminal domain and similar C-terminal domains, dictates its function in cartilage.
  • The structural similarities between LP, HABR, and other hyaluronate-binding proteins (e.g., CD44, TSG-6) suggest conserved binding mechanisms.