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Fingerprinting desmosine-containing elastin peptides.

Christoph U Schräder1, Andrea Heinz, Petra Majovsky

  • 1Institute of Pharmacy, Faculty of Natural Sciences I, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.

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|January 22, 2015
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Summary
This summary is machine-generated.

Researchers identified unique product ions from desmosine (DES) and isodesmosine (IDES) cross-links in elastin. This discovery enables a new algorithm for identifying these crucial cross-links in complex biological samples.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Structural Biology

Background:

  • Elastin, a key extracellular matrix protein, provides elasticity to tissues in jawed vertebrates.
  • Its precursor, tropoelastin, is cross-linked to form mature elastin, a process unique to this protein.
  • The unique desmosine (DES) and isodesmosine (IDES) cross-links confer mechanical integrity but hinder structural analysis.

Purpose of the Study:

  • To investigate the fragmentation patterns of desmosine (DES) and isodesmosine (IDES) under collision-induced dissociation (CID).
  • To identify characteristic product ions indicative of intact DES/IDES cross-links.
  • To develop a method for identifying DES/IDES-cross-linked peptides in elastin digests.

Main Methods:

  • Performed energy-resolved collision-induced dissociation (CID) experiments on DES, IDES, their derivatives, and related peptides.
  • Determined the elemental composition of characteristic product ions using exact mass measurements.
  • Developed and applied a similarity-based scoring algorithm to LC-MS/MS data of bovine elastin digests.

Main Results:

  • All investigated DES/IDES compounds produced consistent product ion clusters at elevated collision energies.
  • Exact mass analysis revealed product ions with molecular formulas of the type CxHyN, indicating the pyridinium core remains intact.
  • The developed algorithm successfully identified DES/IDES-cross-linked peptides in bovine elastin digests.

Conclusions:

  • Specific product ions are characteristic of intact DES/IDES cross-links, even under high-energy CID.
  • This finding enables the development of robust algorithms for identifying elastin cross-links.
  • The new approach facilitates the direct investigation of native cross-links in elastin structure.