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Stabilization Mechanism of Cytochromec552from a Moderately Thermophilic Bacterium,Hydrogenophilus thermoluteolus. Biosci Biotechnol Biochem 2014; 72:2103-9. [DOI: 10.1271/bbb.80187] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Wakai S, Masanari M, Ikeda T, Yamaguchi N, Ueshima S, Watanabe K, Nishihara H, Sambongi Y. Oxidative phosphorylation in a thermophilic, facultative chemoautotroph, Hydrogenophilus thermoluteolus, living prevalently in geothermal niches. ENVIRONMENTAL MICROBIOLOGY REPORTS 2013; 5:235-242. [PMID: 23584967 DOI: 10.1111/1758-2229.12005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 10/01/2012] [Indexed: 06/02/2023]
Abstract
Hydrogenophilus is a thermophilic, facultative chemoautotroph, which lives prevalently in high temperature geothermal niches. Despite the environmental distribution, little is known about its oxidative phosphorylation. Here, we show that inverted membrane vesicles derived from Hydrogenophilus thermoluteolus cells autotrophically cultivated with H2 formed a proton gradient on the addition of succinate, dl-lactate, and NADH, and exhibited oxidation activity toward these three organic compounds. These indicate the capability of mixotrophic growth of this bacterium. Biochemical analysis demonstrated that the same vesicles contained an F-type ATP synthase. The F1 sector of the ATP synthase purified from H. thermoluteolus membranes exhibited optimal ATPase activity at 65°C. Transformed Escherichia coli membranes expressing H. thermoluteolus F-type ATP synthase exhibited the same temperature optimum for the ATPase. These findings shed light on H. thermoluteolus oxidative phosphorylation from the aspects of membrane bioenergetics and ATPase biochemistry, which must be fundamental and advantageous in the biogeochemical cycles occurred in the high temperature geothermal niches.
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Affiliation(s)
- Satoshi Wakai
- Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
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Ichiki SI, Nakamura S, Ohkubo T, Kobayashi Y, Hasegawa J, Uchiyama S, Nishihara H, Mizuta K, Sambongi Y. Cloning, expression, crystallization and preliminary X-ray characterization of cytochrome c552 from a moderate thermophilic bacterium, Hydrogenophilus thermoluteolus. Acta Crystallogr Sect F Struct Biol Cryst Commun 2005; 61:395-8. [PMID: 16511051 PMCID: PMC1952422 DOI: 10.1107/s1744309105007761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2005] [Accepted: 03/11/2005] [Indexed: 11/11/2022]
Abstract
The amino-acid sequence of cytochrome c552 (PH c552) from a moderately thermophilic bacterium, Hydrogenophilus thermoluteolus, was more than 50% identical to that of cytochrome c from an extreme thermophile, Hydrogenobacter thermophilus (HT c552), and from a mesophile, Pseudomonas aeruginosa (PA c551). The PH c552 gene was overexpressed as a correctly processed holoprotein in the Escherichia coli periplasm. The overexpressed PH c552 has been crystallized by vapour diffusion from polyethylene glycol 4000 pH 6.5. The crystals belong to space group C222(1), with unit-cell parameters a = 48.98, b = 57.99, c = 56.20 A. The crystals diffract X-rays to around 2.1 A resolution.
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Affiliation(s)
- Shin-ichi Ichiki
- Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
| | - Shota Nakamura
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita 565-0871, Japan
| | - Tadayasu Ohkubo
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita 565-0871, Japan
| | - Yuji Kobayashi
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita 565-0871, Japan
| | - Jun Hasegawa
- Daiichi Pharmaceutical Co. Ltd, Edogawa-ku, Tokyo 134-8630, Japan
| | - Susumu Uchiyama
- Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
| | - Hirofumi Nishihara
- Ibaraki University, Chu-ou 3-21-1, Ami-machi, Inashiki-gun, Ibaraki 300-0393, Japan
| | - Keiko Mizuta
- Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
| | - Yoshihiro Sambongi
- Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
- CREST of Japan Science and Technology Corporation, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
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vanden Hoven RN, Santini JM. Arsenite oxidation by the heterotroph Hydrogenophaga sp. str. NT-14: the arsenite oxidase and its physiological electron acceptor. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2004; 1656:148-55. [PMID: 15178476 DOI: 10.1016/j.bbabio.2004.03.001] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2003] [Revised: 03/03/2004] [Accepted: 03/04/2004] [Indexed: 11/19/2022]
Abstract
Heterotrophic arsenite oxidation by Hydrogenophaga sp. str. NT-14 is coupled to the reduction of oxygen and appears to yield energy for growth. Purification and partial characterization of the arsenite oxidase revealed that it (1). contains two heterologous subunits, AroA (86 kDa) and AroB (16 kDa), (2). has a native molecular mass of 306 kDa suggesting an alpha(3)beta(3) configuration, and (3). contains molybdenum and iron as cofactors. Although the Hydrogenophaga sp. str. NT-14 arsenite oxidase shares similarities to the arsenite oxidases purified from NT-26 and Alcaligenes faecalis, it differs with respect to activity and overall conformation. A c-551-type cytochrome was purified from Hydrogenophaga sp. str. NT-14 and appears to be the physiological electron acceptor for the arsenite oxidase. The cytochrome can also accept electrons from the purified NT-26 arsenite oxidase. A hypothetical electron transport chain for heterotrophic arsenite oxidation is proposed.
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Affiliation(s)
- Rachel N vanden Hoven
- Department of Microbiology, La Trobe University, 3086, Victoria, Melbourne, Australia
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Hasegawa J, Shimahara H, Mizutani M, Uchiyama S, Arai H, Ishii M, Kobayashi Y, Ferguson SJ, Sambongi Y, Igarashi Y. Stabilization of Pseudomonas aeruginosa cytochrome c(551) by systematic amino acid substitutions based on the structure of thermophilic Hydrogenobacter thermophilus cytochrome c(552). J Biol Chem 1999; 274:37533-7. [PMID: 10608805 DOI: 10.1074/jbc.274.53.37533] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A heterologous overexpression system for mesophilic Pseudomonas aeruginosa holocytochrome c(551) (PA c(551)) was established using Escherichia coli as a host organism. Amino acid residues were systematically substituted in three regions of PA c(551) with the corresponding residues from thermophilic Hydrogenobacter thermophilus cytochrome c(552) (HT c(552)), which has similar main chain folding to PA c(551), but is more stable to heat. Thermodynamic properties of PA c(551) with one of three single mutations (Phe-7 to Ala, Phe-34 to Tyr, or Val-78 to Ile) showed that these mutants had increased thermostability compared with that of the wild-type. Ala-7 and Ile-78 may contribute to the thermostability by tighter hydrophobic packing, which is indicated by the three dimensional structure comparison of PA c(551) with HT c(552). In the Phe-34 to Tyr mutant, the hydroxyl group of the Tyr residue and the guanidyl base of Arg-47 formed a hydrogen bond, which did not exist between the corresponding residues in HT c(552). We also found that stability of mutant proteins to denaturation by guanidine hydrochloride correlated with that against the thermal denaturation. These results and others described here suggest that significant stabilization of PA c(551) can be achieved through a few amino acid substitutions determined by molecular modeling with reference to the structure of HT c(552). The higher stability of HT c(552) may in part be attributed to some of these substitutions.
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Affiliation(s)
- J Hasegawa
- Daiichi Pharmaceutical Co., Ltd., Edogawa-ku, Tokyo 134-8630, Japan.
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