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Choudhuri I, Khanra K, Maity P, Patra A, Maity GN, Pati BR, Nag A, Mondal S, Bhattacharyya N. Structure and biological properties of exopolysaccharide isolated from Citrobacter freundii. Int J Biol Macromol 2020; 168:537-549. [PMID: 33316341 DOI: 10.1016/j.ijbiomac.2020.12.063] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 09/25/2020] [Accepted: 12/07/2020] [Indexed: 02/08/2023]
Abstract
This study aimed to investigate the molecular characterization, antioxidant activity in vitro, cytotoxicity study of an exopolysaccharide isolated from Citrobacter freundii. Firstly, the culture conditions were standardized by the Design of experiments (DoE) based approach, and the final yield of thecrude exopolysaccharide was optimized at 2568 ± 169 mg L-1. One large fraction of exopolysaccharide was obtained from the culture filtrate by size exclusion chromatography and molecular characteristics were studied. A new mannose rich exopolysaccharide (Fraction-I) with average molecular weight ~ 1.34 × 105 Da was isolated. The sugar analysis showed the presence of mannose and glucose in a molar ratio of nearly 7:2 respectively. The structure of the repeating unit in the exopolysaccharide was determined through chemical and 1D/2D- NMR experiments as: Finally, the antioxidant activity, and the cytotoxicity of the exopolysaccharide were investigated and the relationship with molecular properties was discussed as well.
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Affiliation(s)
- Indranil Choudhuri
- Department of Biotechnology, Panskura Banamali College, P.O. - Panskura R.S., Purba Medinipur, West Bengal PIN-721152, India
| | - Kalyani Khanra
- Department of Biotechnology, Panskura Banamali College, P.O. - Panskura R.S., Purba Medinipur, West Bengal PIN-721152, India
| | - Prasenjit Maity
- Department of Chemistry, Sabang Sajanikanta Mahavidyalaya, Sabang, Paschim Midnapore, West Bengal PIN-721166, India
| | - Anutosh Patra
- Department of Biotechnology, Panskura Banamali College, P.O. - Panskura R.S., Purba Medinipur, West Bengal PIN-721152, India
| | - Gajendra Nath Maity
- Department of Chemistry, Panskura Banamali College, P.O. - Panskura R.S., Purba Medinipur, West Bengal PIN-721152, India
| | - Bikas Ranjan Pati
- Dept. of Microbiology, Vidyasagar University, Medinipur, West Bengal PIN-721102, India
| | - Anish Nag
- Department of Life Sciences, CHRIST (Deemed to be University), Bengaluru PIN-560029, India
| | - Soumitra Mondal
- Department of Chemistry, Panskura Banamali College, P.O. - Panskura R.S., Purba Medinipur, West Bengal PIN-721152, India.
| | - Nandan Bhattacharyya
- Department of Biotechnology, Panskura Banamali College, P.O. - Panskura R.S., Purba Medinipur, West Bengal PIN-721152, India.
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Jiang X, Cui X, Liu W, Xu H, Zheng B. Genetic characterization of a novel sequence type of multidrug-resistant Citrobacter freundii strain recovered from wastewater treatment plant. Infect Drug Resist 2019; 12:2775-2779. [PMID: 31564927 PMCID: PMC6735533 DOI: 10.2147/idr.s213525] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 08/16/2019] [Indexed: 12/29/2022] Open
Abstract
A multidrug-resistant Citrobacter freundii strain R17 was isolated from a wastewater treatment plant in China. Whole-genome sequencing of strain R17 revealed a new sequence type (ST412) chromosome (length 5,124,258 bp) and an Inc FII (Yp) group plasmid pCFR17_1 (length 206,820 bp). A total of 13 antibiotic-resistance genes (ARGs) that confer resistance to eight different antibiotic groups were encoded by strain R17 and 12 of them were carried by plasmid pCFR17_1. These data and analysis suggest that the environment-derived C. freundii strains may serve as potential sources of ARGs and highlight the need of further surveillance of this bacteria in the future.
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Affiliation(s)
- Xiawei Jiang
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Xinjie Cui
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Wenhong Liu
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, People's Republic of China
| | - Hao Xu
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China
| | - Beiwen Zheng
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China
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