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Journal of Bacteriology, May 2005, p. 3415-3420, Vol. 187, No. 10
0021-9193/05/$08.00+0     doi:10.1128/JB.187.10.3415-3420.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Role of Mycobacterium tuberculosis Ser/Thr Kinase PknF: Implications in Glucose Transport and Cell Division

Parampal Deol,1,{dagger} Reena Vohra,1,{dagger} Adesh Kumar Saini,1 Amit Singh,2 Harish Chandra,1 Puneet Chopra,1 Taposh K. Das,3 Anil K. Tyagi,2 and Yogendra Singh1*

Institute of Genomics and Integrative Biology, Mall Road, Delhi,1 Department of Biochemistry, University of Delhi, South Campus, New Delhi,2 Department of Anatomy, All India Institute of Medical Sciences, New Delhi, India3

Received 16 December 2004/ Accepted 8 February 2005

Protein kinases have a diverse array of functions in bacterial physiology, with a distinct role in the regulation of development, stress responses, and pathogenicity. pknF, one of the 11 kinases of Mycobacterium tuberculosis, encodes an autophosphorylating, transmembrane serine/threonine protein kinase, which is absent in the fast-growing, nonpathogenic Mycobacterium smegmatis. Herein, we investigate the physiological role of PknF using an antisense strategy with M. tuberculosis and expressing PknF and its kinase mutant (K41M) in M. smegmatis. Expression of PknF in M. smegmatis led to reduction in the growth rate and shortening and swelling of cells with constrictions. Interestingly, an antisense strain of M. tuberculosis expressing a low level of PknF displayed fast growth and a deformed cell morphology compared to the wild-type strain. Electron microscopy showed that most of the cells of the antisense strain were of a smaller size with an aberrant septum. Furthermore, nutrient transport analysis of these strains was conducted using 3H-labeled and 14C-labeled substrates. A significant increase in the uptake of D-glucose but not of glycerol, leucine, or oleic acid was observed in the antisense strain compared to the wild-type strain. The results suggest that PknF plays a direct/indirect role in the regulation of glucose transport, cell growth, and septum formation in M. tuberculosis.

* Corresponding author. Mailing address: Institute of Genomics and Integrative Biology, Mall Road, Near Jubilee Hall, Delhi 110 007, India. Phone: 011-2766 6157. Fax: 011-2766 7471. E-mail: ysingh{at}igib.res.in.

{dagger} These authors contributed equally to this work.

Journal of Bacteriology, May 2005, p. 3415-3420, Vol. 187, No. 10
0021-9193/05/$08.00+0     doi:10.1128/JB.187.10.3415-3420.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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