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A Sir2 family protein Rv1151c deacetylates HU to alter its DNA binding mode in Mycobacterium tuberculosis

Anand, Chinmay and Garg, Rajni and Ghosh, Soumitra and Nagaraja, Valakunja (2017) A Sir2 family protein Rv1151c deacetylates HU to alter its DNA binding mode in Mycobacterium tuberculosis. In: BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 493 (3). pp. 1204-1209.

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Official URL: http://doi.org/ 10.1016/j.bbrc.2017.09.087


Till recently, knowledge about epigenetic regulation in bacterial world confined largely to DNA methylation. Lysine acetylation/deacetylation of histones is a major contributor for chromatin dynamics in eukaryotes. However, little is known about such epigenetic changes brought about by post translational modifications in bacteria. Here, we describe an example of such mechanism occurring in a histone like protein, HU from Mycobacterium tuberculosis (Mtb). Previously, we demonstrated the interaction and acetylation of Mtb HU (MtHU) by one of the acetyl transferases, Eis. In this work, we demonstrate the deacetylation of acetylated HU (MtHU(Ac)) by Rv1151c, the only Sir2 like protein discovered in Mtb. The DNA binding properties of MtHU are significantly altered upon acetylation but reversed consequent to deacetylation by the deacetylase. Deacetylated HU (MtHUdAc) bound to relaxed DNA leading to the formation of looped and dense molecules as compared to open structures formed by its acetylated form. Interaction of MtHUdAc with linear DNA modifies its organization leading to formation of highly bridged compact structures while binding of MtHUA` leads to the formation of stiff and straight rods. That a nucleoid associated protein can undergo acetylation/deacetylation to alter its DNA binding and architectural role opens up a new dimension of investigation of epigenetic regulation in mycobacteria. (C) 2017 Elsevier Inc. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ACADEMIC PRESS INC ELSEVIER SCIENCE, 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 17 Nov 2017 06:15
Last Modified: 17 Nov 2017 06:15
URI: http://eprints.iisc.ac.in/id/eprint/58249

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