Journal
FEBS LETTERS
Volume 561, Issue 1-3, Pages 58-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0014-5793(04)00125-5
Keywords
oxidase; cytochrome bd; topology; membrane protein; beta-lactamase; gene fusion
Funding
- NHLBI NIH HHS [HL16101] Funding Source: Medline
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The cytochrome bd quinol oxidase is a component of the respiratory chain of many prokaryotes. The enzyme contains two subunits, CydA and CydB, which were initially predicted based on the sequence of the Escherichia coli oxidase to have seven and eight transmembrane spans, respectively. More recently, the topological model of CydA was revised to predict nine transmembrane helices, based on additional sequence information from other organisms. In the current work, the topology of the E. coli oxidase was experimentally examined using beta-lactamase gene fusions. The results confirm the revised topology, which places the oxygen reactive site near the periplasmic surface. (C) 2004 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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