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Evolution of the soluble nitrate reductase: Defining the monomeric periplasmic nitrate reductase subgroup

Lookup NU author(s): Dr Clive Butler

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Abstract

Bacterial nitrate reductases can be classified into at least three groups according to their localization and function, namely membrane-bound (NAR) or periplasmic (NAP) respiratory and cytoplasmic assimilatory (NAS) enzymes. Monomeric NASs are the simplest of the soluble nitrate reductases, although heterodimeric NASs exist, and a common structural arrangement of NAP is that of a NapAB heterodimer. Using bioinformatic analysis of published genomes, we have identified more representatives of a monomeric class of NAP, which is the evolutionary link between the monomeric NASs and the heterodimeric NAPs. This has further established the monomeric structural clade of NAP. The operons of the monomeric NAP do not contain NapB and suggest that other redox partners are employed by these enzymes, including NapM or NapG predicted proteins. A structural alignment and comparison of the monomeric and heterodimeric NAPs suggests that a difference in surface polarity is related to the interaction of the respective catalytic subunit and redox partner. ©2006 Biochemical Society.


Publication metadata

Author(s): Jepson BJN, Marietou A, Mohan S, Cole JA, Butler CS, Richardson DJ

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Biochemical Society Transactions: 11th Nitrogen Cycle Meeting

Year of Conference: 2006

Pages: 122-126

ISSN: 0300-5127

Publisher: Portland Press Ltd.

URL: http://dx.doi.org/10.1042/BST0340122

DOI: 10.1042/BST0340122

PubMed id: 16417499

Library holdings: Search Newcastle University Library for this item

ISBN: 14708752


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