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Molecular characterisation of ABC transporter type FtsE and FtsX proteins of Mycobacterium tuberculosis.

Mir, Mushtaq Ahmad and Rajeswari, Haryadi S and Veeraraghavan, Usha and Ajitkumar, Parthasarathi (2006) Molecular characterisation of ABC transporter type FtsE and FtsX proteins of Mycobacterium tuberculosis. In: Archives of Microbiology, 185 (2). pp. 147-158.

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Abstract

Elicitation of drug resistance and various survival strategies inside host macrophages have been the hallmarks of Mycobacterium tuberculosis as a successful pathogen. ATP Binding Cassette (ABC) transporter type proteins are known to be involved in the efflux of drugs in bacterial and mammalian systems. FtsE, an ABC transporter type protein, in association with the integral membrane protein FtsX, is involved in the assembly of potassium ion transport proteins and probably of cell division proteins as well, both of which being relevant to tubercle bacillus. In this study, we cloned ftsE gene of M. tuberculosis, overexpressed and purified. The recombinant MtFtsE-6xHis protein and the native MtFtsE protein were found localized on the membrane of E. coli and M. tuberculosis cells, respectively. MtFtsE-6xHis protein showed ATP binding in vitro, for which the K42 residue in the Walker A motif was found essential. While MtFtsE-6xHis protein could partially complement growth defect of E. coli ftsE temperature-sensitive strain MFT1181, co-expression of MtFtsE and MtFtsX efficiently complemented the growth defect, indicating that the MtFtsE and MtFtsX proteins might be performing an associated function. MtFtsE and MtFtsX-6xHis proteins were found to exist as a complex on the membrane of E. coli cells co-expressing the two proteins.

Item Type: Journal Article
Additional Information: copyright of this article belongs to springer.
Keywords: FtsE - FtsX - ABC transporter type protein - Walker A motif - ATP binding - Mycobacterium tuberculosis - cell division
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 24 Feb 2010 09:42
Last Modified: 19 Sep 2010 05:55
URI: http://eprints.iisc.ernet.in/id/eprint/25602

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