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Kang M, Chhetri G, Kim J, Kim I, Seo T. Pontibacter cellulosilyticus sp. nov., a carboxymethyl cellulose-hydrolysing bacterium isolated from coastal water. Int J Syst Evol Microbiol 2021; 71. [PMID: 34694986 DOI: 10.1099/ijsem.0.005058] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A Gram-stain-negative, rod-shaped, non-motile, red-pink bacterium designated SD6T was isolated from coastal marine water at Sadong Beach, Ulleung Island, South Korea. Cells of SD6T grew at 10-42 °C (optimum, 30 °C), pH 5.0-9.0 (optimum, pH 6.0-7.0) and at 0-8.0 % (w/v) NaCl (optimum, 0-3 %). Moreover, 16S rRNA gene sequence analysis indicated that strain SD6T was a member of the genus Pontibacter, sharing similarities to Pontibacter aydingkolensis XAAS-1T (98.0 %), Pontibacter amylolyticus 9-2T (97.3 %), Pontibacter korlensis X14-1T (97.2 %) and Pontibacter soli HYL7-26T (96.8 %). The predominant fatty acids of strain SD6T were identified as iso-C15 : 0 and summed feature 4 (comprising anteiso-C17 : 1 B and/or iso-C17 : 1 I) and the sole respiratory quinone was identified as MK-7 (menaquinone 7). Major polar lipids included phosphatidylethanolamine, one unidentified phosphoglycolipid, two unidentified glycolipids and one unidentified lipid. The average nucleotide identity and in silico DNA-DNA hybridization values of strain SD6T with its closely related strains were 72.8-79.8 % and 19.2-22.6 %, respectively. The genomic DNA G+C content was 45.4 mol%. In accordance with the results of phenotypic, chemotaxonomic and phylogenetic data, strain SD6T represents a novel species of the genus Pontibacter, for which the name Pontibacter cellulosilyticus sp. nov. is proposed. The type strain is SD6T (=KACC 21543T=NBRC 114313T=JCM 31022T).
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Affiliation(s)
- Minchung Kang
- Department of Life Science, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Geeta Chhetri
- Department of Life Science, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Jiyoun Kim
- Department of Life Science, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Inhyup Kim
- Department of Life Science, Dongguk University-Seoul, Goyang 10326, Republic of Korea
| | - Taegun Seo
- Department of Life Science, Dongguk University-Seoul, Goyang 10326, Republic of Korea
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Banerjee S, Maiti TK, Roy RN. Production, purification, and characterization of cellulase from Acinetobacter junii GAC 16.2, a novel cellulolytic gut isolate of Gryllotalpa africana, and its effects on cotton fiber and sawdust. ANN MICROBIOL 2020. [DOI: 10.1186/s13213-020-01569-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Ma L, Zhao Y, Meng L, Wang X, Yi Y, Shan Y, Liu B, Zhou Y, Lü X. Isolation of Thermostable Lignocellulosic Bacteria From Chicken Manure Compost and a M42 Family Endocellulase Cloning From Geobacillus thermodenitrificans Y7. Front Microbiol 2020; 11:281. [PMID: 32174898 PMCID: PMC7054444 DOI: 10.3389/fmicb.2020.00281] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 02/07/2020] [Indexed: 01/01/2023] Open
Abstract
The composting ecosystem provides a potential resource for finding new microorganisms with the capability for cellulose degradation. In the present study, Congo red method was used for the isolating of thermostable lignocellulose-degrading bacteria from chicken manure compost. A thermophilic strain named as Geobacillus thermodenitrificans Y7 with acid-resident property was successfully isolated and employed to degrade raw switchgrass at 60°C for 5 days, which resulted in the final degradation rates of cellulose, xylan, and acid-insoluble lignin as 18.64, 12.96, and 17.21%, respectively. In addition, GC-MS analysis about aromatic degradation affirm the degradation of lignin by G. thermodenitrificans Y7. Moreover, an endocellulase gene belong to M42 family was successfully cloned from G. thermodenitrificans Y7 and expressed in Escherichia coli BL21. Recombinant enzyme Cel-9 was purified by Ni-NTA column based the His-tag, and the molecular weight determined as 40.4 kDa by SDA-PAGE. The characterization of the enzyme Cel-9 indicated that the maximum enzyme activity was realized at 50°C and pH 8.6 and, Mn2+ could greatly improve the CMCase enzyme activity of Cel-9 at 10 mM, which was followed by Fe2+ and Co2+. Besides, it also found that the β-1,3-1,4, β-1,3, β-1,4, and β-1,6 glucan linkages all could be hydrolyzed by enzyme Cel-9. Finally, during the application of enzyme Cel-9 to switchgrass, the saccharification rates achieved to 1.81 ± 0.04% and 2.65 ± 0.03% for 50 and 100% crude enzyme, respectively. All these results indicated that both the strain G. thermodenitrificans Y7 and the recombinant endocellulase Cel-9 have the potential to be applied to the biomass industry.
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Affiliation(s)
- Lingling Ma
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yuchun Zhao
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Limin Meng
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Xin Wang
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yanglei Yi
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yuanyuan Shan
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Bianfang Liu
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yuan Zhou
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Xin Lü
- Laboratory of Bioresources, College of Food Science and Engineering, Northwest A&F University, Yangling, China
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Wang ZY, Wang RX, Zhou JS, Cheng JF, Li YH. An assessment of the genomics, comparative genomics and cellulose degradation potential of Mucilaginibacter polytrichastri strain RG4-7. BIORESOURCE TECHNOLOGY 2020; 297:122389. [PMID: 31757614 DOI: 10.1016/j.biortech.2019.122389] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 10/22/2019] [Accepted: 11/06/2019] [Indexed: 06/10/2023]
Abstract
In this study, whole genome sequencing and comparative genomic analyses were performed for Mucilaginibacter polytrichastri RG4-7 and its carboxymethyl cellulose degradation potential was assessed. The results showed that the genome of strain RG4-7 was 5.84 Mb and contained 5019 predicted genes, in which a high proportion of strain-specific genes were related to carbohydrate metabolism. The carboxymethyl cellulose (CMC) degradation and cellulase activity tests revealed the strong cellulose degradation ability, CMCase and β-glucosidase activity in strain RG4-7. Real-time RT-PCR testing of most cellulose degradation related glycoside hydrolase (GH) families showed that GH9 (OKS85969), GH1 (OKS85832), GH3 (OKS89331 and OKS85615) were significantly up-regulated when strain RG4-7 was inoculated with CMC-Na, which suggested that GH9, GH1 and GH3 might determine its cellulose degradation ability. Certainly, further research need to be done to elucidate cellulose degradation mechanisms in strain RG4-7 in order to develop its industrial application value in lignocellulosic biomass degradation and waste management.
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Affiliation(s)
- Zi Yue Wang
- College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Rui Xue Wang
- College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Jun Shi Zhou
- College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Jian Fei Cheng
- College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Yan Hong Li
- College of Life Sciences, Capital Normal University, Beijing 100048, China.
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