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Chhaya A, Sharma A, Dattu Hade M, Kaur J, Dikshit KL. Transcript analysis and expression of the glbO gene, encoding truncated hemoglobin,O, of M. smegmatis implicate its role under hypoxia and oxidative stress. Gene X 2022; 841:146759. [PMID: 35933051 DOI: 10.1016/j.gene.2022.146759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 07/24/2022] [Indexed: 12/12/2022] Open
Abstract
Although truncated hemoglobin O, (trHbO), is ubiquitous among mycobacteria, its physiological function is not very obvious and may be diverse. In an attempt to understand role of trHbO in cellular metabolism of a non-pathogenic mycobacterium, we analysed expression profile of the glbO gene, encoding trHbO, in M. smegmatis and studied implications of its overexpression on physiology of its host under different environmental conditions. Quantitative RT-PCR indicated that transcript level of the glbO gene remains low at a basal level under aerobic growth cycle of M. smegmatis but its level gets induced significantly during low oxygen, oxidative stress and macrophage infection. Overexpression of the glbO gene enhanced growth of M. smegmatis under hypoxia, promoted pellicle biofilm formation and provided resistance towards oxidative stress. Additionally, glbO gene overexpressing M. smegmatis exhibited enhanced cell survival over isogenic control cells and altered the level of pro- and anti- inflammatory cytokines during intracellular infection. These results suggested important role of trHbO, in supporting the cellular metabolism and survival of M, smegmatis both under low oxygen and oxidative stress.
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Affiliation(s)
- Ajay Chhaya
- Department of Biotechnology, Panjab University, Chandigarh 160014, India
| | - Aashish Sharma
- Department of Biotechnology, Panjab University, Chandigarh 160014, India
| | - Mangesh Dattu Hade
- Department of Biotechnology, Panjab University, Chandigarh 160014, India
| | - Jagdeep Kaur
- Department of Biotechnology, Panjab University, Chandigarh 160014, India
| | - Kanak L Dikshit
- Department of Biotechnology, Panjab University, Chandigarh 160014, India.
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Yu F, Zhao X, Wang Z, Liu L, Yi L, Zhou J, Li J, Chen J, Du G. Recent Advances in the Physicochemical Properties and Biotechnological Application of Vitreoscilla Hemoglobin. Microorganisms 2021; 9:microorganisms9071455. [PMID: 34361891 PMCID: PMC8306070 DOI: 10.3390/microorganisms9071455] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 07/03/2021] [Accepted: 07/04/2021] [Indexed: 11/16/2022] Open
Abstract
Vitreoscilla hemoglobin (VHb), the first discovered bacterial hemoglobin, is a soluble heme-binding protein with a faster rate of oxygen dissociation. Since it can enhance cell growth, product synthesis and stress tolerance, VHb has been widely applied in the field of metabolic engineering for microorganisms, plants, and animals. Especially under oxygen-limited conditions, VHb can interact with terminal oxidase to deliver enough oxygen to achieve high-cell-density fermentation. In recent years, with the development of bioinformatics and synthetic biology, several novel physicochemical properties and metabolic regulatory effects of VHb have been discovered and numerous strategies have been utilized to enhance the expression level of VHb in various hosts, which greatly promotes its applications in biotechnology. Thus, in this review, the new information regarding structure, function and expressional tactics for VHb is summarized to understand its latest applications and pave a new way for the future improvement of biosynthesis for other products.
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Affiliation(s)
- Fei Yu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
| | - Xinrui Zhao
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- Correspondence: (X.Z.); (G.D.)
| | - Ziwei Wang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
| | - Luyao Liu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
| | - Lingfeng Yi
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
| | - Jingwen Zhou
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
| | - Jianghua Li
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
| | - Jian Chen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
| | - Guocheng Du
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; (F.Y.); (Z.W.); (L.L.); (L.Y.); (J.Z.); (J.L.); (J.C.)
- Science Center for Future Foods, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China
- Correspondence: (X.Z.); (G.D.)
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