An organism-independent unified model for activity of orotate phosphoribosyltransferases for orotidine monophosphate synthesis. (25th May 2015)

• Record Type: Journal Article
• Authors: Subrahmanyeswara Rao, N.N.; Deshpande, Parag A.
• Is Part Of: Chemical engineering science. Volume 128(2015)
• Page Start: 109
• Page End: 118
• Publication Date: 2015-05-25
• Subjects: Enzyme catalysis -- Pyrimidine synthesis -- Mechanistic model -- Kinetic analysis -- Non-linear regression; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2015.02.004
• Languages: English
• ISSNs: 0009-2509

Abstract

Abstract: A unified model for orotate phosphoribosyltransferase-action has been developed describing the enzymatic synthesis of orotidine monophosphate, an important intermediate for nucleotide synthesis. The reaction, prevalent in micro-organisms, participates in the de novo nucleotide synthesis pathway, and is a popular target for inhibition to check the growth of Mycobacterium tuberculosis . Features of three enzymatic mechanisms, viz., ping-pong bi-bi mechanism, random kinetic mechanism and sequential kinetic mechanism were incorporated in the unified model to increase the range of successful applicability of the model and to make it organism-independent. The model could successfully describe the kinetics of reaction for the reported data. Kinetics of the reaction with enzyme derived from Mycobacterium tuberculosis, Saccharomyces cerevisiae, Salmonella typhimurium and Plasmodium falciparum was tested and the unified model was found to be valid with a change in the organism from which the enzyme has been derived. The model can serve as a reliable model to describe the kinetics of the reaction with enzyme derived from new organisms without having to do the mechanistic determination owing to organism-independent nature of the model. Abstract : Highlights: We propose a mechanistic model for the action of orotate phosphoribosyltransferase. The model encompassed the features of ping-pong, ordered and random kinetic model. The model proposed was organism-independent. The model was tested to describe the kinetics of orotidine monophosphate synthesis.