title: Biochemical characterization of a chromosomal toxin-antitoxin system in Mycobacterium tuberculosis.
abstract: In the present paper, we report the biochemical characterization of a chromosomal toxin-antitoxin (TA) system in Mycobacterium tuberculosis, consisting of the Rv1991c gene and its upstream open reading frame (ORF) termed Rv1991a. Rv1991c was characterized as a toxin with ribonuclease activity and Rv1991a as the antitoxin against Rv1991c. Rv1991a interacted with Rv1991c to form a complex. A promoter located immediately upstream of Rv1991a was identified. Both Rv1991a and the Rv1991a-Rv1991c complex were able to bind to the promoter region of the Rv1991a-Rv1991c operon, indicating that the expression of the Rv1991a-Rv1991c operon can be autoregulated.
authors.affiliation: The Key Laboratory for Cell Proliferation and Regulation Biology of Ministry of Education, Institute of Cell Biology, College of Life Sciences, Beijing Normal University, Beijing, China.
authors.forename: Longxuan
authors.initials: L
authors.lastname: Zhao
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000992:Antitoxins / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism; D001427:Bacterial Toxins / Q000378:metabolism*; D002876:Chromosomes, Bacterial / Q000378:metabolism*; D004269:DNA, Bacterial / Q000378:metabolism; D009169:Mycobacterium tuberculosis / Q000201:enzymology / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D012260:Ribonucleases / Q000378:metabolism*
chemical_list: D000992:Antitoxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004269:DNA, Bacterial; D012260:Ribonucleases