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  • Title: Identification of erythro-beta-hydroxyasparagine in the EGF-like domain of human C1r.
    Author: Arlaud GJ, Van Dorsselaer A, Bell A, Mancini M, Aude C, Gagnon J.
    Journal: FEBS Lett; 1987 Sep 28; 222(1):129-34. PubMed ID: 2820791.
    Abstract:
    Previous studies [(1987) Biochem. J. 241, 711-720] have shown that position 150 of human C1r is occupied by a modified amino acid that, after acid hydrolysis, yields erythro-beta-hydroxyaspartic acid. In view of further investigations on the nature of this residue, peptide CN1a T8/T9 TL8 (positions 147-155) was isolated from C1r A chain by CNBr cleavage followed by enzymatic cleavages by trypsin and thermolysin. Amino acid analysis, sequential Edman degradation and FAB-MS of this peptide indicate that the residue at position 150 is an erythro-beta-hydroxyasparagine resulting from post-translational hydroxylation of asparagine.
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