JAC Advance Access originally published online on April 29, 2004
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Journal of Antimicrobial Chemotherapy (2004) 53, 971-974
© 2004 The British Society for Antimicrobial Chemotherapy
Antimicrobial activity of clofazimine is not dependent on mycobacterial C-type phospholipases
1 Tuberculosis Research Lead Programme, Medical Research Council, Pretoria; 2 Medical Research Council Unit for Inflammation and Immunity, Department of Immunology, Faculty of Health Sciences, University of Pretoria, PO Box 2034, Pretoria 0001, South Africa
Received 21 November 2003; accepted 27 February 2004
We have used a phospholipase C (PLC)-deletion mutant (plcABC) of the H37Rv strain of Mycobacterium tuberculosis (MTB), as well as a plcA-insertion mutant of Mycobacterium smegmatis, to investigate the possible involvement of PLCs in clofazimine-mediated inhibition of mycobacterial K+ transport and growth. Inactivation of the PLCs of MTB and insertion of the plcA gene into M. smegmatis resulted in a substantial reduction and increase in hydrolysis of phosphatidylcholine (PC), respectively. However, both the mutant and wild-type strains of MTB and M. smegmatis were equally sensitive to the inhibitory effects of clofazimine on K+ uptake and growth. These observations demonstrate that the PLCs of MTB are not involved in the antimicrobial activity of clofazimine.
Keywords: mycobacteria, phospholipase C, Mycobacterium tuberculosis, Mycobacterium smegmatis
* Corresponding author. Tel: +27-12-319-2425; Fax: +27-12-323-0732; E-mail: randerso{at}medic.up.ac.za
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