alexa Glycogenomics of Mycobacterium tuberculosis
ISSN: 2161-1068

Mycobacterial Diseases
Open Access

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Review Article

Glycogenomics of Mycobacterium tuberculosis

Anil Kumar Gupta, Amit Singh and Sarman Singh*

Division of Clinical Microbiology and Molecular Medicine, Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi, India

Corresponding Author:
Sarman Singh
Division of Clinical Microbiology and Molecular Medicine
Department of Laboratory Medicine
All India Institute of Medical Sciences
Ansari Nagar, New Delhi-110 029, India
Tel: +91-11-26588484
Fax: +91-11-26588641
E-mail: [email protected]

Received Date: July 03, 2014; Accepted Date: October 30, 2014; Published Date: November 10, 2014

Citation: Gupta AK, Singh A, Singh S (2014) Glycogenomics of Mycobacterium tuberculosis. Mycobact Dis 4:175. doi:10.4172/2161-1068.1000175

Copyright: © 2014 Gupta AK, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

Glycogen is an important energy store of almost all living organisms. It is an alpha linked polymer comprised of thousands of glucose units. In bacteria it is usually synthesized when carbon ions are in excess in the growth medium and its synthesis helps for the survival of the bacteria under such nutritional conditions. Mycobacterium tuberculosis (M. tuberculosis), accumulates glycogen during the adverse condition such as reactive oxygen and nitrogen intermediates, low pH, nutrients and other vital element starvation for their survival in the host. Glycogen also plays a very important role in the pathogenesis of M. tuberculosis. The biosynthesis of glycogens is mediated by glycosyltransferases enzyme which can be divided into two families; glycogen transferase (GT) 3 and glycosyltransferases GT 5. Regulation of glycogen metabolism in bacteria involves a complex mechanism, involving several synthase enzymes such as glycogen synthase A (glgA), glycogen branching enzyme (glgB), and catalytic enzyme (glgC). Another enzyme known as glycogen phosphorylase (glgP), removes extra units of glucose from the non- reducing ends of the glycogen molecule. Several workers have recognized role of glycogen in Mycobacterial pathogenesis, in the recent years. Trehalose-dimycolate (TDM) and trehalose-monomycolate (TMM) present in the cell wall are indeed a precursor of mycolic acid of Mycobacteria, which plays an important role in its invasion and pathogenesis. This review focuses on various cycles and mechanisms involved in the glycogen synthesis in M. tuberculosis and its role in pathogenesis.

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