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Lai D, Khan FST, Rath SP. Multiheme proteins: effect of heme–heme interactions. Dalton Trans 2018; 47:14388-14401. [DOI: 10.1039/c8dt00518d] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
This Frontier illustrates a brief personal account on the effect of heme–heme interactions in dihemes which thereby discloses some of the evolutionary design principles involved in multiheme proteins for their diverse structures and functions.
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Affiliation(s)
- Dipti Lai
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
| | | | - Sankar Prasad Rath
- Department of Chemistry
- Indian Institute of Technology Kanpur
- Kanpur-208016
- India
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Wei H, Dai J, Xia M, Romine MF, Shi L, Beliav A, Tiedje JM, Nealson KH, Fredrickson JK, Zhou J, Qiu D. Functional roles of CymA and NapC in reduction of nitrate and nitrite by Shewanella putrefaciens W3-18-1. MICROBIOLOGY-SGM 2016; 162:930-941. [PMID: 27010745 DOI: 10.1099/mic.0.000285] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Shewanella putrefaciens W3-18-1 harbours two periplasmic nitrate reductase (Nap) gene clusters, NapC-associated nap-alpha (napEDABC) and CymA-dependent nap-beta (napDAGHB), for dissimilatory nitrate respiration. CymA is a member of the NapC/NirT quinol dehydrogenase family and acts as a hub to support different respiratory pathways, including those on iron [Fe(III)] and manganese [Mn(III, IV)] (hydr)oxide, nitrate, nitrite, fumarate and arsenate in Shewanella strains. However, in our analysis it was shown that another NapC/NirT family protein, NapC, was only involved in nitrate reduction, although both CymA and NapC can transfer quinol-derived electrons to a periplasmic terminal reductase or an electron acceptor. Furthermore, our results showed that NapC could only interact specifically with the Nap-alpha nitrate reductase while CymA could interact promiscuously with Nap-alpha, Nap-beta and the NrfA nitrite reductase for nitrate and nitrite reduction. To further explore the difference in specificity, site-directed mutagenesis on both CymA and NapC was conducted and the phenotypic changes in nitrate and nitrite reduction were tested. Our analyses demonstrated that the Lys-91 residue played a key role in nitrate reduction for quinol oxidation and the Asp-166 residue might influence the maturation of CymA. The Asp-97 residue might be one of the key factors that influence the interaction of CymA with the cytochromes NapB and NrfA.
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Affiliation(s)
- Hehong Wei
- Institute of hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jingcheng Dai
- Institute of hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
| | - Ming Xia
- Institute of hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | | | - Liang Shi
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Alex Beliav
- Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - James M Tiedje
- Center for Microbial Ecology, Michigan State University, East Lansing, MI 48824, USA
| | - Kenneth H Nealson
- Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | | | - Jizhong Zhou
- Institute for Environmental Genomics and Department of Plant Biology and Microbiology, University of Oklahoma, OK, Norman, OK 73019, USA
| | - Dongru Qiu
- Institute of hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China
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