Identification of glucose-derived cross-linking sites in ribonuclease A.

ABSTRACT: The accumulation of glycation derived cross-links has been widely implicated in extracellular matrix damage in aging and diabetes, yet little information is available on the cross-linking sites in proteins and the intra- versus intermolecular character of cross-linking. Recently, glucosepane, a 7-membered heterocycle formed between lysine and arginine residues, has been found to be the single major cross-link known so far to accumulate during aging. As an approach toward identification of glucose derived cross-linking sites, we have preglycated ribonuclease A first for for 14 days with 500 mM glucose, followed by a 4-week incubation in absence of glucose. MALDI-TOF analysis of tryptic digests revealed the presence of Amadori products (Delta m/ z = 162) at K1, K7, K37 and K41, in accordance

SUBMITTER: Dai Z 

PROVIDER: S-EPMC2574603 | biostudies-literature | 2008 Jul

REPOSITORIES: biostudies-literature