Structure and function of enzymes involved in the anaerobic degradation of L-threonine to propionate

Simanshu, Dhirendra K and Chittori, Sagar and Savithri, HS and Murthy, MRN (2007) Structure and function of enzymes involved in the anaerobic degradation of L-threonine to propionate. In: Journal of Biosciences, 32 (2). pp. 1195-1206.

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Abstract

In Escherichia coli and Salmonella typhimurium, L-threonine is cleaved non-oxidatively to propionate via 2-ketobutyrate by biodegradative threonine deaminase, 2-ketobutyrate formate-lyase (or pyruvate formate-lyase), phosphotransacetylase and propionate kinase. In the anaerobic condition, L-threonine is converted to the energy-rich keto acid and this is subsequently catabolised to produce ATP via substrate-level phosphorylation, providing a source of energy to the cells. Most of the enzymes involved in the degradation of L-threonine to propionate are encoded by the anaerobically regulated tdc operon. In the recent past, extensive structural and biochemical studies have been carried out on these enzymes by various groups. Besides detailed structural and functional insights, these studies have also shown the similarities and differences between the other related enzymes present in the metabolic network. In this paper, we review the structural and biochemical studies carried out on these enzymes.

Item Type:	Journal Article
Publication:	Journal of Biosciences
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Crystal structure;L-threonine;propionate metabolism;structure;function relationship.
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit Division of Biological Sciences > Biochemistry
Date Deposited:	18 Jul 2008
Last Modified:	19 Sep 2010 04:47
URI:	http://eprints.iisc.ac.in/id/eprint/15089

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