Dourado PL, Cardoso VL, Coelho ASG, Bataus LAM. Sequence analysis and characterization of plasmid pLK39 isolated from endophytic Salmonella sp. isolated from Solanum lycocarpum.
Curr Microbiol 2014;
69:846-51. [PMID:
25086582 DOI:
10.1007/s00284-014-0663-z]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Accepted: 06/11/2014] [Indexed: 10/24/2022]
Abstract
The complete nucleotide sequence of a small cryptic plasmid pLK39 isolated from endophytic Salmonella sp. was determined. This plasmid is 4,029 bp long with an overall GC content of 55.4 %. Sequence analyses of pLK39 revealed extensive homology to several plasmids: pRK10, pK, pSW200, pBERT, pST728/06-2, pSW100, pEC3, and pUCD5000. Using the ORF Finder program, 35 putative ORFs was identified, 30 showed more than 35 residues. After performing a search for homologous sequences to the pLK39 at BLASTn software on NCBI, it was ascertained that the plasmid has a ColE1-like replication origin and also a region of mobilization proteins from relaxase family (mobCABD). Besides these mobilization proteins, the pLK39 codes a putative DUF903 protein family, which is characterized as assumed external cytoplasmic membrane lipoprotein. A recombinant form of pLK39 carrying a kanamycin resistance gene is stably maintained in Escherichia coli cells grown in the absence of selection pressure. pLK39 was compatible with pUC18, pBR322, and pACYC184.
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