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Journal of Bacteriology, December 1999, p. 7161-7167, Vol. 181, No. 23
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Characterization of Activity and Expression of Isocitrate Lyase in Mycobacterium avium and Mycobacterium tuberculosis

Kerstin Höner Zu Bentrup,1,* Andras Miczak,1,2 Dana L. Swenson,1 and David G. Russell1

Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110,1 and Department of Microbiology, Albert Szent-Gyorgyi Medical University, Szeged POB-8-6701, Hungary2

Received 20 May 1999/Accepted 10 September 1999

Analysis by two-dimensional gel electrophoresis revealed that Mycobacterium avium expresses several proteins unique to an intracellular infection. One abundant protein with an apparent molecular mass of 50 kDa was isolated, and the N-terminal sequence was determined. It matches a sequence in the M. tuberculosis database (Sanger) with similarity to the enzyme isocitrate lyase of both Corynebacterium glutamicum and Rhodococcus fascians. Only marginal similarity was observed between this open reading frame (ORF) (termed icl) and a second distinct ORF (named aceA) which exhibits a low similarity to other isocitrate lyases. Both ORFs can be found as distinct genes in the various mycobacterial databases recently published. Isocitrate lyase is a key enzyme in the glyoxylate cycle and is essential as an anapleurotic enzyme for growth on acetate and certain fatty acids as carbon source. In this study we express and purify Icl, as well as AceA proteins, and show that both exhibit isocitrate lyase activity. Various known inhibitors for isocitrate lyase were effective. Furthermore, we present evidence that in both M. avium and M. tuberculosis the production and activity of the isocitrate lyase is enhanced under minimal growth conditions when supplemented with acetate or palmitate.

* Corresponding author. Mailing address: Department of Molecular Microbiology, Washington University Medical School, 660 S. Euclid Ave., Box 8230, St. Louis, MO 63110. Phone: (314) 362-4987. Fax: (314) 362-1232. E-mail: hoenerk{at}borcim.wustl.edu.

Journal of Bacteriology, December 1999, p. 7161-7167, Vol. 181, No. 23
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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