Anchoring of surface proteins to the cell wall of Staphylococcus aureus. Sortase catalyzed in vitro transpeptidation reaction using LPXTG peptide and NH(2)-Gly(3) substrates.
Staphylococcus aureus sortase anchors surface proteins to the cell wall envelope by cleaving polypeptides at the LPXTG motif. Surface proteins are linked to the peptidoglycan by an amide bond between the C-terminal carboxyl and the amino group of the pentaglycine cross-bridge. We find that purified recombinant sortase hydrolyzed peptides bearing an LPXTG motif at the peptide bond between threonine and glycine. In the presence of NH(2)-Gly(3), sortase catalyzed exclusively a transpeptidation reaction, linking the carboxyl group of threonine to the amino group of NH(2)-Gly(3). In the presence of amino group donors the rate of sortase mediated cleavage at the LPXTG motif was increased. Hydrolysis and transpeptidation required the sulfhydryl of cysteine 184, suggesting that sortase catalyzed the transpeptidation reaction of surface protein anchoring via the formation of a thioester acyl-enzyme intermediate.
Ton-That
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Department of Microbiology & Immunology, The Neuropsychiatric Institute, UCLA School of Medicine, Los Angeles, California 90095, USA.
Mazmanian
S K
SK
Faull
K F
KF
Schneewind
O
O
D000595:Amino Acid Sequence; D019881:Aminoacyltransferases / Q000378:metabolism*; D001426:Bacterial Proteins; D001483:Base Sequence; D002384:Catalysis; D002473:Cell Wall / Q000201:enzymology*; D003546:Cysteine Endopeptidases; D017931:DNA Primers; D006898:Hydroxylamines / Q000378:metabolism; D007700:Kinetics; D009842:Oligopeptides / Q000378:metabolism; D010458:Peptidyl Transferases / Q000378:metabolism*; D013211:Staphylococcus aureus / Q000201:enzymology*; D013379:Substrate Specificity
D001426:Bacterial Proteins; D017931:DNA Primers; D006898:Hydroxylamines; D009842:Oligopeptides; D019881:Aminoacyltransferases; C120542:sortase A; D010458:Peptidyl Transferases; D003546:Cysteine Endopeptidases