Spontaneous cleavage of proteins at serine residues

Brian Lyons, Joanne Jamie, Roger J W Truscott*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    Long-lived proteins are found at several sites in the body and they undergo numerous changes as a result of prolonged exposure to physiological conditions. Truncation is a common modification and many cleavages appear to be non-enzymatic, however little is known about the processes involved. In this study we demonstrate, using synthetic peptides that incorporate the sequence of a protein that is known to cleave in older lenses, that truncation on the N-terminal side of serine residues can occur at neutral pH. A mechanism that incorporates an N,O-acyl shift, which is analogous to intein cleavage, is proposed. Such cleavages may explain the origin of abundant peptides derived from crystallins in aged human lenses.

    Original languageEnglish
    Pages (from-to)131-135
    Number of pages5
    JournalInternational Journal of Peptide Research and Therapeutics
    Volume17
    Issue number2
    DOIs
    Publication statusPublished - Jun 2011

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