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Ehrlich chromogens, probable cross-links in elastin and collagen.

P D Kemp1, J E Scott

  • 1Chemical Morphology, Cell and Structural Biology, University of Manchester, U.K.

The Biochemical Journal
|June 1, 1988
PubMed
Summary

This study identifies and quantifies Ehrlich chromogens (ECs) in tissue elastin and collagen using a novel azo-coupling method. Findings reveal distinct structures and prevalence, particularly in collagen cross-linking regions.

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Area of Science:

  • Biochemistry
  • Biomaterials Science
  • Analytical Chemistry

Background:

  • Tissue proteins like collagen and elastin contain Ehrlich chromogens (ECs) that react with specific reagents.
  • Previous studies identified ECs in collagen, but their presence and nature in elastin were less understood.

Purpose of the Study:

  • To characterize and quantify Ehrlich chromogens (ECs) in tissue elastin and compare them to those in collagen.
  • To develop a method for isolating and analyzing EC-containing peptides from proteolytic digests.

Main Methods:

  • Utilized diazobenzene-coupled polyacrylamide beads for specific absorption of ECs from digests.
  • Employed mild alkaline cleavage and gel chromatography for purification of azo-EC-peptides.
  • Incorporated 15N-labeled sodium nitrite to quantify EC groups and determine molar absorption coefficients.

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Main Results:

  • Developed a method to isolate and purify Ehrlich chromogen-containing peptides (azo-EC-peptides) from elastin and collagen digests.
  • Elastin azo-EC peptides lacked glucose and galactose, unlike collagen azo-EC peptides, and had distinct amino acid profiles.
  • Quantitative analysis suggested a collagen structure with two EC groups shared between four peptide chains, with approximately 15% of adult bovine skin collagen containing EC groups.

Conclusions:

  • Ehrlich chromogens (ECs) are present in both collagen and elastin, but differ in composition and structure.
  • The developed azo-coupling method provides a quantitative approach to study these cross-linking associated moieties.
  • The findings offer insights into the structural organization and cross-linking mechanisms within collagen and elastin.