Ukr.Biochem.J. 2016; Volume 88, Issue 5, Sep-Oct, pp. 71-81

doi: https://doi.org/10.15407/ubj88.05.071

Mutation of katG in a clinical isolate of Mycobacterium tuberculosis: effects on catalase-peroxidase for isoniazid activation

07.11.2016   Uncategorized   No comments

Purkan1, Ihsanawati2, D. Natalia2, Y. M. Syah2,
D. S. Retnoningrum3, H. S. Kusuma4

1Biochemistry Research Division, Department of Chemistry,
Faculty of Sciences and Technology, Airlangga University; Surabaya, Indonesia;
e-mail: purkan@fst.unair.ac.id;
2Biochemistry Research Division, Faculty of Mathematics and Natural Sciences,
Bandung Institute of Technology, Bandung, Indonesia;
3School of Pharmacy, Bandung Institute of Technology, Bandung, Indonesia;
4Department of Chemical Engineering, Institut Teknologi
Sepuluh Nopember, Surabaya, Indonesia;
e-mail: heriseptyakusuma@gmail.com

Mutations in katG gene are often associated with isoniazid (INH) resistance in Mycobacterium tuberculosis strain. This research was perfomed to identify the katG mutation in clinical isolate (L8) that is resistant to INH at 1 μg/ml. In addition to characterize the catalase-peroxidase of KatG L8 and perform the ab initio structural study of the protein to get a more complete understanding in drug activation and the resistan­ce mechanism. The katG gene was cloned and expressed in Escherichia coli, then followed by characterization of catalase-peroxidase of KatG. The structure modelling was performed to know a basis of alterations in enzyme activity. A substitution of A713G that correspond to Asn238Ser replacement was found in the L8 katG. The Asn238Ser modification leads to a decline in the activity of catalase-peroxidase and INH oxidation of the L8 KatG protein. The catalytic efficiency (Kcat/KM) of mutant KatGAsn238Ser respectively decreases to 41 and 52% for catalase and peroxidase. The mutant KatGAsn238Ser also shows a decrease of 62% in INH oxidation if compared to a wild type KatG (KatGwt). The mutant Asn238Ser might cause instability in the substrate binding­ site of KatG, because of removal of a salt bridge connecting the amine group of Asn238 to the carbo­xyl group of Glu233, which presents in KatGwt. The lost of the salt bridge in the substrate binding site in mutant KatGAsn238Ser created changes unfavorable for enzyme activities, which in turn emerge as INH resistan­ce in the L8 isolate of M. tuberculosis.

Keywords: , , ,

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