In vitro activity of recombinant lysostaphin against Staphylococcus aureus isolates from hospitals in Beijing, China.

Abstract:

:Lysostaphin is a glycylglycine endopeptidase. It cleaves the pentaglycine cross-bridge structure unique to the staphylococcal cell wall and is considered to be a potential drug for Staphylococcus aureus. In the present study, the in vitro activity of recombinant lysostaphin was investigated in 257 S. aureus isolates collected from hospital patients in Beijing, China, by determination of MIC and minimum bactericidal concentration (MBC) and a time-kill curve test. An agar dilution method was used for MIC determination in all of the isolates and a macrobroth dilution method was employed to verify MIC values for a subset of the isolates. All of the S. aureus strains were sensitive to the recombinant lysostaphin with MICs ranging from 0.03 to 2 microg ml(-1) in the agar dilution assay. The antibacterial activity of lysostaphin was greater than that of vancomycin and other reference agents. For most of the isolates, the MICs from the agar dilution method were higher than those from the broth dilution method. The MBCs of lysostaphin in the test isolates were between 1- and 8-fold higher than their MIC values. Bactericidal activity (>99.9 % reduction) was observed after 2 h exposure of the isolates to lysostaphin at concentrations of > or =0.5 MIC. Lysostaphin showed a rapid bactericidal activity against the test strains of meticillin-susceptible S. aureus and meticillin-resistant S. aureus. Its activity at > or =0.5 MIC was sustained for at least 6 h. These results will be informative for the clinical application and evaluation of lysostaphin.

journal_name

J Med Microbiol

authors

Yang XY,Li CR,Lou RH,Wang YM,Zhang WX,Chen HZ,Huang QS,Han YX,Jiang JD,You XF

doi

10.1099/jmm.0.46788-0

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

71-76

issue

Pt 1

eissn

0022-2615

issn

1473-5644

journal_volume

56

pub_type

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