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    J Biol Chem. 2006 Sep 15;281(37):26985-93. Epub 2006 Jul 13.

    In vitro synthesis of cross-linked murein and its attachment to sacculi by PBP1A from Escherichia coli.

    Born P, Breukink E, Vollmer W.

    Source

    Mikrobielle Genetik, Universität Tübingen, Auf der Morgenstelle 28, 72076 Tübingen, Germany.

    Abstract

    The penicillin-binding protein (PBP) 1A is a major murein (peptidoglycan) synthase in Escherichia coli. The murein synthesis activity of PBP1A was studied in vitro with radioactive lipid II substrate. PBP1A produced murein glycan strands by transglycosylation and formed peptide cross-links by transpeptidation. Time course experiments revealed that PBP1A, unlike PBP1B, required the presence of polymerized glycan strands carrying monomeric peptides for cross-linking activity. PBP1A was capable of attaching nascent murein synthesized from radioactive lipid II to nonlabeled murein sacculi. The attachment of the new material occurred by transpeptidation reactions in which monomeric triand tetrapeptides in the sacculi were the acceptors.

    PMID:
    16840781
    [PubMed - indexed for MEDLINE]
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