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Yang G, Hou T, Lin A, Xia X, Quan X, Chen Z, Zhuang L. Sub-inhibitory concentrations of ampicillin affect microbial Fe(III) oxide reduction. JOURNAL OF HAZARDOUS MATERIALS 2023; 451:131131. [PMID: 36917911 DOI: 10.1016/j.jhazmat.2023.131131] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 03/01/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Antibiotics are ubiquitous in the iron-rich environments but their roles in microbial reduction of Fe(III) oxides are still unclear. Using ampicillin and Geobacter soli, this study investigated the underlying mechanism by which antibiotic regulated microbial reduction of Fe(III) oxides. Results showed that sub-minimal inhibitory concentrations (sub-MIC) of ampicillin significantly affected ferrihydrite reduction by G. soli, with a stimulatory effect at 1/64 and 1/32 MIC and an inhibitory effect at 1/8 MIC. Increasing ampicillin concentration resulted in increasing cell length and decreasing bacterial zeta potential that were beneficial for ferrihydrite reduction, and decreasing outer membrane permeability that was unfavorable for ferrihydrite reduction. The respiratory metabolism ability was enhanced by 1/64 and 1/32 MIC ampicillin and reduced by 1/8 MIC ampicillin, which was also responsible for regulation of ferrihydrite reduction by ampicillin. The ferrihydrite reduction showed a positive correlation with the redox activity of extracellular polymeric substances (EPS) which was tied to the cytochrome/polysaccharide ratio and the content of α-helices and β-sheet in EPS. These results suggested that ampicillin regulated microbial Fe(III) oxide reduction through modulating the bacterial morphology, metabolism activity and extracellular electron transfer ability. Our findings provide new insights into the environmental factors regulating biogeochemical cycling of iron.
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Affiliation(s)
- Guiqin Yang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Tiqun Hou
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Annian Lin
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Xue Xia
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Xiaoyun Quan
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Zhili Chen
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Li Zhuang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
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Murgida DH. In Situ Spectroelectrochemical Investigations of Electrode-Confined Electron-Transferring Proteins and Redox Enzymes. ACS OMEGA 2021; 6:3435-3446. [PMID: 33585730 PMCID: PMC7876673 DOI: 10.1021/acsomega.0c05746] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 01/19/2021] [Indexed: 06/09/2023]
Abstract
This perspective analyzes recent advances in the spectroelectrochemical investigation of redox proteins and enzymes immobilized on biocompatible or biomimetic electrode surfaces. Specifically, the article highlights new insights obtained by surface-enhanced resonance Raman (SERR), surface-enhanced infrared absorption (SEIRA), protein film infrared electrochemistry (PFIRE), polarization modulation infrared reflection-absorption spectroscopy (PMIRRAS), Förster resonance energy transfer (FRET), X-ray absorption spectroscopy (XAS), electron paramagnetic resonance (EPR), and differential electrochemical mass spectrometry (DMES)-based spectroelectrochemical methods on the structure, orientation, dynamics, and reaction mechanisms for a variety of immobilized species. This includes small heme and copper electron shuttling proteins, large respiratory complexes, hydrogenases, multicopper oxidases, alcohol dehydrogenases, endonucleases, NO-reductases, and dye decolorizing peroxidases, among other enzymes. Finally, I discuss the challenges and foreseeable future developments toward a better understanding of the functioning of these complex macromolecules and their exploitation in technological devices.
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Affiliation(s)
- Daniel H. Murgida
- Departamento
de Química Inorgánica, Analítica y Química-Física,
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos
Aires 1428, Argentina
- Instituto
de Química Física de los Materiales, Medio Ambiente
y Energía (INQUIMAE), CONICET-Universidad de Buenos Aires, Buenos Aires C1428EHA, Argentina
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Abstract
Transmembrane proteins involved in metabolic redox reactions and photosynthesis catalyse a plethora of key energy-conversion processes and are thus of great interest for bioelectrocatalysis-based applications. The development of membrane protein modified electrodes has made it possible to efficiently exchange electrons between proteins and electrodes, allowing mechanistic studies and potentially applications in biofuels generation and energy conversion. Here, we summarise the most common electrode modification and their characterisation techniques for membrane proteins involved in biofuels conversion and semi-artificial photosynthesis. We discuss the challenges of applications of membrane protein modified electrodes for bioelectrocatalysis and comment on emerging methods and future directions, including recent advances in membrane protein reconstitution strategies and the development of microbial electrosynthesis and whole-cell semi-artificial photosynthesis.
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Guo Y, Hu D, Guo J, Li X, Guo J, Wang X, Xiao Y, Jin H, Liu M, Li Z, Bi D, Zhou Z. The Role of the Regulator Fur in Gene Regulation and Virulence of Riemerella anatipestifer Assessed Using an Unmarked Gene Deletion System. Front Cell Infect Microbiol 2017; 7:382. [PMID: 28971067 PMCID: PMC5609570 DOI: 10.3389/fcimb.2017.00382] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 08/09/2017] [Indexed: 11/29/2022] Open
Abstract
Riemerella anatipestifer, an avian pathogen, has resulted in enormous economic losses to the duck industry globally. Notwithstanding, little is known regarding the physiological, pathogenic and virulence mechanisms of Riemerella anatipestifer (RA) infection. However, the role of Ferric uptake regulator (Fur) in the virulence of R. anatipestifer has not, to date, been demonstrated. Using a genetic approach, unmarked gene deletion system, we evaluated the function of fur gene in the virulence of R. anatipestifer. For this purpose, we constructed a suicide vector containing pheS as a counter selectable marker for unmarked deletion of fur gene to investigate its role in the virulence. After successful transformation of the newly constructed vector, a mutant strain was characterized for genes regulated by iron and Fur using RNA-sequencing and a comparison was made between wild type and mutant strains in both iron restricted and enriched conditions. RNA-seq analysis of the mutant strain in a restricted iron environment showed the downregulation and upregulation of genes which were involved in either important metabolic pathways, transport processes, growth or cell membrane synthesis. Electrophoretic mobility shift assay was performed to identify the putative sequences recognized by Fur. The putative Fur-box sequence was 5′-GATAATGATAATCATTATC-3′. Lastly, the median lethal dose and histopathological investigations of animal tissues also illustrated mild pathological lesions produced by the mutant strain as compared to the wild type RA strain, hence showing declined virulence. Conclusively, an unmarked gene deletion system was successfully developed for RA and the role of the fur gene in virulence was explored comprehensively.
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Affiliation(s)
- Yunqing Guo
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Di Hu
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Jie Guo
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Xiaowen Li
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Jinyue Guo
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Xiliang Wang
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Yuncai Xiao
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Hui Jin
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural UniversityWuhan, China
| | - Mei Liu
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Zili Li
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
| | - Dingren Bi
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China.,State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural UniversityWuhan, China
| | - Zutao Zhou
- College of Veterinary Medicine, Huazhong Agricultural UniversityWuhan, China.,Key Lab of Preventive Veterinary Medicine of Hubei Province, Huazhong Agricultural UniversityWuhan, China
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