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Biochemical characterisation of the Mycobacterium tuberculosis phosphoribosyl-1-pyrophosphate synthetase (Mt-PrsA)

Alderwick, Luke J. and Lloyd, Georgina S. and Lloyd, Adrian J and Lovering, Andrew and Eggeling, Lothar and Besra, Gurdyal S (2010) Biochemical characterisation of the Mycobacterium tuberculosis phosphoribosyl-1-pyrophosphate synthetase (Mt-PrsA). Glycobiology. ISSN 0959-6658

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URL of Published Version: http://dx.doi.org/10.1093/glycob/cwq173

Identification Number/DOI: 10.1093/glycob/cwq173

Mycobacterium tuberculosis arabinogalactan (AG) is an essential cell wall component. It provides a molecular framework serving to connect peptidoglycan to the outer mycolic acid layer. The biosynthesis of the arabinan domains of AG and lipoarabinomannan (LAM), occurs via a combination of membrane bound arabinofuranosyltransferases, all of which utilise decaprenol-1-monophosphorabinose as a substrate (DPA). The source of arabinose ultimately destined for deposition into cell wall AG or LAM, originates exclusively from phosphoribosyl-1-pyrophosphate (pRpp), a central metabolite which is also required for other essential metabolic processes, such as de novo purine and pyrimidne biosynthesis. In M. tuberculosis, a single pRpp synthetase enzyme (Mt-PrsA) is soley responsible for the generation of pRpp, by catalysing the transfer of pyrophosphate from ATP to the C1 hydroxyl position of ribose-5-phosphate. Here, we report a detailed biochemical and biophysical study of Mt-PrsA, which exhibits the most rapid enzyme kinetics reported for a pRpp synthetase.

Type of Work:Article
Date:02 November 2010 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Life & Environmental Sciences
Department:School of Biosciences
Subjects:QP Physiology
Institution:University of Birmingham
Copyright Holders:Oxford University Press
ID Code:582
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