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An P, Yang C, Li W, Zhao D, Xiang H. The Isolation and Characterization of a Novel Psychrotolerant Cellulolytic Bacterium, Microbacterium sp. QXD-8 T. Microorganisms 2024; 12:303. [PMID: 38399707 PMCID: PMC10892437 DOI: 10.3390/microorganisms12020303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 12/29/2023] [Accepted: 01/08/2024] [Indexed: 02/25/2024] Open
Abstract
Cellulolytic microorganisms play a crucial role in agricultural waste disposal. Strain QXD-8T was isolated from soil in northern China. Similarity analyses of the 16S rRNA gene, as well as the 120 conserved genes in the whole-genome sequence, indicate that it represents a novel species within the genus Microbacterium. The Microbacterium sp. QXD-8T was able to grow on the CAM plate with sodium carboxymethyl cellulose as a carbon source at 15 °C, forming a transparent hydrolysis circle after Congo red staining, even though the optimal temperature for the growth and cellulose degradation of strain QXD-8T was 28 °C. In the liquid medium, it effectively degraded cellulose and produced reducing sugars. Functional annotation revealed the presence of encoding genes for the GH5, GH6, and GH10 enzyme families with endoglucanase activity, as well as the GH1, GH3, GH39, and GH116 enzyme families with β-glucosidase activity. Additionally, two proteins in the GH6 family, one in the GH10, and two of nine proteins in the GH3 were predicted to contain a signal peptide and transmembrane region, suggesting their potential for extracellularly degrade cellulose. Based on the physiological features of the type strain QXD-8T, we propose the name Microbacterium psychrotolerans for this novel species. This study expands the diversity of psychrotolerant cellulolytic bacteria and provides a potential microbial resource for straw returning in high-latitude areas at low temperatures.
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Affiliation(s)
- Peng An
- College of Life Science, Sichuan Normal University, Chengdu 610101, China; (P.A.); (W.L.)
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China;
| | - Changjialian Yang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China;
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Li
- College of Life Science, Sichuan Normal University, Chengdu 610101, China; (P.A.); (W.L.)
| | - Dahe Zhao
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China;
| | - Hua Xiang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China;
- University of Chinese Academy of Sciences, Beijing 100049, China
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Sinha D, Banerjee S, Mandal S, Basu A, Banerjee A, Balachandran S, Chandra Mandal N, Chaudhury S. Enhanced biogas production from Lantana camara via bioaugmentation of cellulolytic bacteria. BIORESOURCE TECHNOLOGY 2021; 340:125652. [PMID: 34332446 DOI: 10.1016/j.biortech.2021.125652] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/19/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
A study was designed to isolate cellulolytic bacteria from termite-gut and soil, optimizing their cellulase production to enhance biogas generation, using Lantana camara as a substrate. Out of 57 bacteria screened, two isolates DSB1 and DSB12, showed significant cellulolytic activity. 16S rRNA based methods identified these isolates as Microbacterium sp. and Arthrobacter sp. respectively. Maximum cellulase activity of 1.26 ± 0.044 U/ml and 1.31 ± 0.052 U/ml for DSB1 and DSB12 was observed at pH 7 and 7.2 under 35⁰C and 37⁰C, respectively. The L. camara biomass substrate with cow dung as an inoculum, bioaugmented with DSB1 and DSB12 separately, was tested for biogas production, producing 950 l/kg and 980 l/kg VS biogas with 57% and 60% methane, respectively. DSB1 and DSB12 revealed as potent cellulase producers that can be harnessed in the anaerobic digester for biomass conversion practices for enhanced biogas production.
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Affiliation(s)
- Debasree Sinha
- Department of Environmental Studies, Siksha -Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India
| | - Sandipan Banerjee
- Mycology and Plant Pathology Laboratory, Department of Botany, Siksha-Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India
| | - Subhrangshu Mandal
- Department of Botany, Siksha-Bhavana, Visva-Bharati, Santiniketan, Birbhum, West Bengal, 731235, India
| | - Aman Basu
- Department of Environmental Studies, Siksha -Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India; Department of Biology, York University, Toronto, Ontario, Canada
| | - Aishiki Banerjee
- Department of Environmental Studies, Siksha -Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India
| | - Srinivasan Balachandran
- Department of Environmental Studies, Siksha -Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India
| | - Narayan Chandra Mandal
- Mycology and Plant Pathology Laboratory, Department of Botany, Siksha-Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India
| | - Shibani Chaudhury
- Department of Environmental Studies, Siksha -Bhavana, Visva-Bharati, Santiniketan, West Bengal, 731235, India.
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Su Y, Shao M, Li T, Lin L. KaAhl, a Novel N-Acylhomoserine Lactonase from Kushneria avicenniae and Attenuated Effect on the Virulence of Erwinia carotovora. BIOTECHNOL BIOPROC E 2021. [DOI: 10.1007/s12257-020-0230-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Steiner E, Margesin R. Production and partial characterization of a crude cold-active cellulase (CMCase) from Bacillus mycoides AR20-61 isolated from an Alpine forest site. ANN MICROBIOL 2020. [DOI: 10.1186/s13213-020-01607-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Purpose
To evaluate the production of a cold-active CMCase (endoglucanase) by Bacillus mycoides AR20-61 isolated from Alpine forest soil and to characterize the crude enzyme.
Methods
After studying the effect of cultivation parameters (medium composition, temperature, NaCl concentration, pH) on bacterial growth and enzyme production, the crude enzyme was characterized with regard to the effect of pH, temperature, and inhibitors on enzyme activity and stability.
Result
Optimum growth and enzyme production occurred at 20–25 °C, pH 7, and 1–1.5% (w/v) CMC. Despite high biomass production over the whole growth temperature range (10–35 °C), enzyme production was low at 10 and 35 °C. CMC concentration had a minor effect on growth, independent of the growth temperature, but a significant effect on CMCase production at temperatures ≥ 20 °C. The crude enzyme was active over a broad temperature range (0–60 °C); the apparent optimum temperature for activity was at 40–50 °C. The cultivation temperature influenced the effect of temperature on enzyme activity and stability. A significantly higher thermosensitivity of the enzyme produced at a cultivation temperature of 10 °C compared to that produced at 25 °C was noted at 50 and 65 °C. The enzyme was highly active over a pH range of 4–6 and showed optimum activity at pH 5. No activity was lost after 60 min of incubation at 30 °C and pH 4–9. The CMCase was resistant against a number of monovalent and divalent metal ions, metal-chelating agents, and phenol.
Conclusion
The CMCase produced by the studied strain is characterized by high activities in the low temperature range (down to 0 °C) and acidic pH range, high stability over a broad pH range, and high resistance against a number of effectors. Our results also demonstrate the different, independent roles of temperature in bacterial growth, enzyme production, nutrient requirements during enzyme production, and enzyme characteristics regarding thermosensitivity, which has not yet been described for cellulases.
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