title: Characterization of three cryptic plasmids from Lactobacillus plantarum G63 that was isolated from Chinese pickle.
abstract: Three plasmids from Lactobacillus plantarum G63, pG6301, pG6302 and pG6303, were sequenced and have molecular sizes of 3516-bp, 9112-bp and 10047-bp, respectively. We determined the replicons of these plasmids. The pG6301 plasmid carried a replication gene that functioned by the rolling-circle replication mechanism. The Rep protein of pG6302 shared extremely low similarity with a reported plasmid, pLME300, which replicated by a bi-directional mechanism. Both the Rep protein and OriV analyses indicated a similar replication mechanism in pG6302. Conversely, we found neither the Rep protein nor OriV when we analyzed the whole sequence of pG6303. This finding may illustrate a novel replication mechanism. Additionally, the transposon, a mobilization element, was analyzed and compared to a similar insertion sequence (IS) element. A predicted lysozyme gene, pG6303 guhA, was heterologously expressed, but no activity was detected. The pG6302 and pG6303 plasmids contain new replicons and may be useful vector candidates for future molecular manipulation of L. plantarum.
authors.affiliation: Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China.
authors.forename: Xuedong
authors.initials: X
authors.lastname: Xi
authors.forename: Jing
authors.initials: J
authors.lastname: Fan
authors.forename: Ying
authors.initials: Y
authors.lastname: Hou
authors.forename: Jinhua
authors.initials: J
authors.lastname: Gu
authors.forename: Wenjing
authors.initials: W
authors.lastname: Shen
authors.forename: Zhoukun
authors.initials: Z
authors.lastname: Li
authors.forename: Zhongli
authors.initials: Z
authors.lastname: Cui
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D004261:DNA Replication; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000235:genetics*; D005285:Fermentation; D015964:Gene Expression Regulation, Bacterial; D048191:Lactiplantibacillus plantarum / Q000235:genetics* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D009113:Muramidase / Q000235:genetics*; D010957:Plasmids; D018741:Replication Origin; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014675:Vegetables / Q000382:microbiology
chemical_list: D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D009113:Muramidase
keywords: Cryptic plasmid; IS; Lactobacillus plantarum; Mobilization; Rep; Replicon