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Lookup NU author(s): Professor Waldemar Vollmer
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The pneumococcus is an important Gram-positive pathogen, which shows increasing resistance to antibiotics, including beta -lactams that target peptidoglycan assembly. Understanding cell-wall synthesis, at the molecular and cellular level, is essential for the prospect of combating drug resistance. As a first step towards reconstituting pneumococcal cell-wall assembly in vitro, we present the characterization of the glycosyltransferase activity of penicillin-binding protein (PBP)2a from Streptococcus pneumoniae. Recombinant full-length membrane-anchored PBP2a was purified by ion-exchange chromatography. The glycosyltransferase activity of this enzyme was found to differ from that of a truncated periplasmic form. The full-length protein with its cytoplasmic and transmembrane segment synthesizes longer glycan chains than the shorter form. The transpeptidase active site was functional, as shown by its reactivity towards bocillin and the catalysis of the hydrolysis of a thiol-ester substrate analogue. However, PBP2a did not cross-link the peptide stems of glycan chains in vitro. The absence of transpeptidase activity indicates that an essential component is missing from the in vitro system. Structured digital abstract and by ()
Author(s): Helassa N, Vollmer W, Breukink E, Vernet T, Zapun A
Publication type: Article
Publication status: Published
Journal: FEBS Journal
Print publication date: 08/05/2012
ISSN (print): 1742-464X
ISSN (electronic): 1742-4658
Publisher: Wiley-Blackwell Publishing Ltd.
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