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Hederstedt L. Molecular Biology of Bacillus subtilis Cytochromes anno 2020. BIOCHEMISTRY (MOSCOW) 2021; 86:8-21. [DOI: 10.1134/s0006297921010028] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Yu Z, Wu F, Tian J, Guo X, An R, Guo Y. Ammonium glycyrrhizin counteracts liver injury caused by lipopolysaccharide/amoxicillin-clavulanate potassium. Oncotarget 2017; 8:96837-96851. [PMID: 29228575 PMCID: PMC5722527 DOI: 10.18632/oncotarget.18291] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 05/07/2017] [Indexed: 12/31/2022] Open
Abstract
We treated isolated chicken primary hepatocytes with lipopolysaccharide/amoxicillin clavulanate potassium (LPS/AC) to model liver injury and investigate its underlying mechanisms. We also used this model to assess the cytoprotective effects of compound ammonium glycyrrhizin (CAG) in vitro. LPS/AC-induced injury decreased cell viability and increased the activity of serum aspartate transaminase and alanine transaminase. Levels of superoxide dismutase, glutathione, and glutathione peroxidase were lower than control, while levels of the oxidative product malondialdehyde and reactive oxygen species were higher. Treatment with CAG for 24 h ameliorated these changes. Caspase-3 activity assays and flow cytometry revealed increased apoptosis in the model group. However, apoptosis decreased after CAG treatment, as confirmed by Hoechst 33342 staining. We also observed changes in mitochondrial ultrastructure. Real-time PCR and western blot analyses showed that CAG treatment downregulated LPS/AC-induced RNA expression of caspase-3, caspase-9, bax, cytochrome c, and fas, and upregulated the expression of bcl-2. Mitochondrial cytochrome c was released into the cytosol and the inner mitochondrial membrane potential (ΔΨm) was decreased. Our results highlight CAG as a potential therapeutic agent to counteract LPS/AC-induced liver injury.
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Affiliation(s)
- Zugong Yu
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, 210095, China
| | - Feng Wu
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, 210095, China
| | - Jing Tian
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, 210095, China
| | - Xuewen Guo
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, 210095, China
| | - Ran An
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, 210095, China
| | - Yangyang Guo
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, 210095, China
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Yin S, Cui H, Peng X, Fang J, Zuo Z, Deng J, Wang X, Wu B, Guo H. Toxic effect of NiCl2 on development of the bursa of Fabricius in broiler chickens. Oncotarget 2016; 7:125-39. [PMID: 26683707 PMCID: PMC4807987 DOI: 10.18632/oncotarget.6591] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 11/28/2015] [Indexed: 01/10/2023] Open
Abstract
This study was conducted with objective of evaluating the toxic effects of nickel chloride (NiCl2) on development of bursa of Fabricius in broilers fed on diets supplemented with 0, 300, 600 and 900 mg/kg of NiCl2 for 42 days by using the methods of experimental pathology, flow cytometry (FCM), and quantitative real-time polymerase chain reaction (qRT-PCR). The results showed that dietary NiCl2 in 300 mg/kg and over induced toxic suppression in the bursal development, which was characterized by decreasing lymphocytes histopathologically and relative weight, increasing G0/G1 phase (a prolonged nondividing state), reducing S phase (DNA replication) and proliferating index, and increasing percentages of apoptotic cells. Concurrently, the mRNA expression levels of bax, cytochrome c (cyt c), apoptotic peptidase activating factor 1 (Apaf-1), caspase-3, caspase-6, caspase-7 and caspase-9 were increased and the bcl-2 mRNA expression levels were decreased. The toxic suppression of bursal development finally impaired humoral immunity duo to the reduction of B lymphocyte population and B lymphocyte activity in the broiler chicken. This study provides new evidences for further studying the effect mechanism of Ni and Ni compoundson B-cell or bursa of Fabricius.
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Affiliation(s)
- Shuang Yin
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China
| | - Hengmin Cui
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China.,College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Xi Peng
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China.,College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Jing Fang
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China.,College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Zhicai Zuo
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China.,College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Junliang Deng
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China.,College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Xun Wang
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China.,College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, China
| | - Bangyuan Wu
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China
| | - Hongrui Guo
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, Ya'an, Sichuan, China
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Sperling E, Górecki K, Drakenberg T, Hägerhäll C. Functional Differentiation of Antiporter-Like Polypeptides in Complex I; a Site-Directed Mutagenesis Study of Residues Conserved in MrpA and NuoL but Not in MrpD, NuoM, and NuoN. PLoS One 2016; 11:e0158972. [PMID: 27391676 PMCID: PMC4938563 DOI: 10.1371/journal.pone.0158972] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 06/26/2016] [Indexed: 01/29/2023] Open
Abstract
It has long been known that the three largest subunits in the membrane domain (NuoL, NuoM and NuoN) of complex I are homologous to each other, as well as to two subunits (MrpA and MrpD) from a Na+/H+ antiporter, Mrp. MrpA and NuoL are more similar to each other and the same is true for MrpD and NuoN. This suggests a functional differentiation which was proven experimentally in a deletion strain model system, where NuoL could restore the loss of MrpA, but not that of MrpD and vice versa. The simplest explanation for these observations was that the MrpA and MrpD proteins are not antiporters, but rather single subunit ion channels that together form an antiporter. In this work our focus was on a set of amino acid residues in helix VIII, which are only conserved in NuoL and MrpA (but not in any of the other antiporter-like subunits.) and to compare their effect on the function of these two proteins. By combining complementation studies in B. subtilis and 23Na-NMR, response of mutants to high sodium levels were tested. All of the mutants were able to cope with high salt levels; however, all but one mutation (M258I/M225I) showed differences in the efficiency of cell growth and sodium efflux. Our findings showed that, although very similar in sequence, NuoL and MrpA seem to differ on the functional level. Nonetheless the studied mutations gave rise to interesting phenotypes which are of interest in complex I research.
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Affiliation(s)
- Eva Sperling
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, Lund, Sweden
- * E-mail:
| | - Kamil Górecki
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, Lund, Sweden
| | - Torbjörn Drakenberg
- Department of Biophysical Chemistry, Center for Molecular Protein Science, Lund University, Lund, Sweden
| | - Cecilia Hägerhäll
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, Lund, Sweden
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Functional role of the MrpA- and MrpD-homologous protein subunits in enzyme complexes evolutionary related to respiratory chain complex I. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2014; 1837:178-85. [DOI: 10.1016/j.bbabio.2013.09.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 09/18/2013] [Accepted: 09/24/2013] [Indexed: 01/15/2023]
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The Na+ transport in gram-positive bacteria defect in the Mrp antiporter complex measured with 23Na nuclear magnetic resonance. Anal Biochem 2013; 445:80-6. [PMID: 24139955 DOI: 10.1016/j.ab.2013.10.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 10/02/2013] [Accepted: 10/04/2013] [Indexed: 11/20/2022]
Abstract
(23)Na nuclear magnetic resonance (NMR) has previously been used to monitor Na(+) translocation across membranes in gram-negative bacteria and in various other organelles and liposomes using a membrane-impermeable shift reagent to resolve the signals resulting from internal and external Na(+). In this work, the (23)Na NMR method was adapted for measurements of internal Na(+) concentration in the gram-positive bacterium Bacillus subtilis, with the aim of assessing the Na(+) translocation activity of the Mrp (multiple resistance and pH) antiporter complex, a member of the cation proton antiporter-3 (CPA-3) family. The sodium-sensitive growth phenotype observed in a B. subtilis strain with the gene encoding MrpA deleted could indeed be correlated to the inability of this strain to maintain a lower internal Na(+) concentration than an external one.
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Virzintiene E, Moparthi VK, Al-Eryani Y, Shumbe L, Górecki K, Hägerhäll C. Structure and function of the C-terminal domain of MrpA in theBacillus subtilisMrp-antiporter complex - The evolutionary progenitor of the long horizontal helix in complex I. FEBS Lett 2013; 587:3341-7. [DOI: 10.1016/j.febslet.2013.08.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Revised: 08/22/2013] [Accepted: 08/23/2013] [Indexed: 01/15/2023]
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Virzintiene E, Trane M, Hägerhäll C. Revised transmembrane orientation of the NADH:quinone oxidoreductase subunit NuoA. FEBS Lett 2011; 585:3277-83. [PMID: 21925501 DOI: 10.1016/j.febslet.2011.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 09/04/2011] [Accepted: 09/05/2011] [Indexed: 01/14/2023]
Abstract
NuoA is a small membrane spanning subunit of respiratory chain NADH:quinone oxidoreductase (complex I). Unlike the other complex I core protein subunits, the NuoA protein has no known homologue in other enzyme systems. The transmembrane orientation of NuoA cannot be unambiguously predicted, due to the small size of the polypeptide and the varying distribution of charged amino acid residues in NuoA from different organisms. Novel analyses of NuoA from Escherichia coli complex I expressed as fusion proteins to cytochrome c and to alkaline phosphatase demonstrated that the c-terminal end of the polypeptide is localized in the bacterial cytoplasm, in contrast to what was previously reported for the homologous NQO7 subunit from Paracoccus denitrificans complex I.
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Affiliation(s)
- Egle Virzintiene
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, Lund, Sweden
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Moparthi VK, Kumar B, Mathiesen C, Hägerhäll C. Homologous protein subunits from Escherichia coli NADH:quinone oxidoreductase can functionally replace MrpA and MrpD in Bacillus subtilis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2011; 1807:427-36. [PMID: 21236240 DOI: 10.1016/j.bbabio.2011.01.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 01/04/2011] [Accepted: 01/05/2011] [Indexed: 10/18/2022]
Abstract
The complex I subunits NuoL, NuoM and NuoN are homologous to two proteins, MrpA and MrpD, from one particular class of Na+/H+ antiporters. In many bacteria MrpA and MrpD are encoded by an operon comprising 6-7 conserved genes. In complex I these protein subunits are prime candidates for harboring important parts of the proton pumping machinery. Deletion of either mrpA or mrpD from the Bacillus subtilis chromosome resulted in a Na+ and pH sensitive growth phenotype. The deletion strains could be complemented in trans by their respective Mrp protein, but expression of MrpA in the B. subtilis ΔmrpD strain and vice versa did not improve growth at pH 7.4. This corroborates that the two proteins have unique specific functions. Under the same conditions NuoL could rescue B. subtilis ΔmrpA, but improved the growth of B. subtilis ΔmrpD only slightly. NuoN could restore the wild type properties of B. subtilis ΔmrpD, but had no effect on the ΔmrpA strain. Expression of NuoM did not result in any growth improvement under these conditions. This reveals that the complex I subunits NuoL, NuoM and NuoN also demonstrate functional specializations. The simplest explanation that accounts for all previous and current observations is that the five homologous proteins are single ion transporters. Presumably, MrpA transports Na+ whereas MrpD transports H+ in opposite directions, resulting in antiporter activity. This hypothesis has implications for the complex I functional mechanism, suggesting that one Na+ channel, NuoL, and two H+ channels, NuoM and NuoN, are present.
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Affiliation(s)
- Vamsi K Moparthi
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, PO Box 124, S-221 00 Lund, Sweden
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