title: Isolation and characterization of Shigella flexneri G3, capable of effective cellulosic saccharification under mesophilic conditions.
abstract: A novel Shigella strain (Shigella flexneri G3) showing high cellulolytic activity under mesophilic, anaerobic conditions was isolated and characterized. The bacterium is Gram negative, short rod shaped, and nonmotile and displays effective production of glucose, cellobiose, and other oligosaccharides from cellulose (Avicel PH-101) under optimal conditions (40°C and pH 6.5). Approximately 75% of the cellulose was hydrolyzed in modified ATCC 1191 medium containing 0.3% cellulose, and the oligosaccharide production yield and specific production rate reached 375 mg g Avicel(-1) and 6.25 mg g Avicel(-1) h(-1), respectively, after a 60-hour incubation. To our knowledge, this represents the highest oligosaccharide yield and specific rate from cellulose for mesophilic bacterial monocultures reported so far. The results demonstrate that S. flexneri G3 is capable of rapid conversion of cellulose to oligosaccharides, with potential biofuel applications under mesophilic conditions.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China. waj0578@hit.edu.cn
authors.forename: Aijie
authors.initials: A
authors.lastname: Wang
authors.forename: Lingfang
authors.initials: L
authors.lastname: Gao
authors.forename: Nanqi
authors.initials: N
authors.lastname: Ren
authors.forename: Jifei
authors.initials: J
authors.lastname: Xu
authors.forename: Chong
authors.initials: C
authors.lastname: Liu
authors.forename: Guangli
authors.initials: G
authors.lastname: Cao
authors.forename: Hao
authors.initials: H
authors.lastname: Yu
authors.forename: Wenzong
authors.initials: W
authors.lastname: Liu
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Hemme
authors.forename: Zhili
authors.initials: Z
authors.lastname: He
authors.forename: Jizhong
authors.initials: J
authors.lastname: Zhou
mesh_terms: D000693:Anaerobiosis; D002482:Cellulose / Q000378:metabolism*; D016000:Cluster Analysis; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D008124:Locomotion; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012763:Shigella flexneri / Q000145:classification* / Q000302:isolation & purification / Q000378:metabolism* / Q000502:physiology; D013696:Temperature
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D002482:Cellulose