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Purification and characterization of malate:quinone oxidoreductase from thermophilic Bacillus sp. PS3

Purification and characterization of malate:quinone oxidoreductase from thermophilic Bacillus sp.... Several bacteria possess membrane-bound dehydrogenases other than cytosolic dehydrogenases in their respiratory chains. In many cases, the membrane-bound malate:quinone oxidoreductases (MQOs) are essential for growth. However, these MQOs are absent in mammalian mitochondria, and therefore may be a potential drug target for pathogenic bacteria. To characterize the kinetic properties of MQOs, we purified MQO from Bacillus sp. PS3, which is a gram-positive and thermophilic bacterium, and cloned the gene encoding MQO based on the obtained partial N-terminus sequence. Purified MQOs showed a molecular mass of ~90 kDa, which was estimated using gel filtration, and it consists of two subunits with a molecular mass of ~50 kDa. Phylogenetic analysis showed a high similarity to the MQO of the Geobacillus group rather than the Bacillus group. Additionally, the purified enzyme was thermostable and it retained menaquinol reduction activity at high temperatures. Although it is difficult to conduct experiments using menaquinol because of its instability, we were able to measure the oxidase activity of cytochrome bd-type quinol oxidase by using menaquinol-1 by coupling this molecule with the menaquinol reduction reaction using purified MQOs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Bioenergetics and Biomembranes Springer Journals

Purification and characterization of malate:quinone oxidoreductase from thermophilic Bacillus sp. PS3

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References (15)

Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media New York
Subject
Chemistry; Bioorganic Chemistry; Biochemistry, general; Animal Anatomy / Morphology / Histology; Animal Biochemistry; Organic Chemistry
ISSN
0145-479X
eISSN
1573-6881
DOI
10.1007/s10863-012-9485-5
pmid
23143325
Publisher site
See Article on Publisher Site

Abstract

Several bacteria possess membrane-bound dehydrogenases other than cytosolic dehydrogenases in their respiratory chains. In many cases, the membrane-bound malate:quinone oxidoreductases (MQOs) are essential for growth. However, these MQOs are absent in mammalian mitochondria, and therefore may be a potential drug target for pathogenic bacteria. To characterize the kinetic properties of MQOs, we purified MQO from Bacillus sp. PS3, which is a gram-positive and thermophilic bacterium, and cloned the gene encoding MQO based on the obtained partial N-terminus sequence. Purified MQOs showed a molecular mass of ~90 kDa, which was estimated using gel filtration, and it consists of two subunits with a molecular mass of ~50 kDa. Phylogenetic analysis showed a high similarity to the MQO of the Geobacillus group rather than the Bacillus group. Additionally, the purified enzyme was thermostable and it retained menaquinol reduction activity at high temperatures. Although it is difficult to conduct experiments using menaquinol because of its instability, we were able to measure the oxidase activity of cytochrome bd-type quinol oxidase by using menaquinol-1 by coupling this molecule with the menaquinol reduction reaction using purified MQOs.

Journal

Journal of Bioenergetics and BiomembranesSpringer Journals

Published: Nov 11, 2012

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