Identification and sequence analysis of IS1297, an ISS1-like insertion sequence in a Leuconostoc strain.
The insertion sequence (IS) ISS1 from Lactococcus lactis was amplified from lactococcal genomic DNA using a primer to the 18-bp inverted repeat sequence. The amplified product hybridized to a single EcoRI fragment in a total genomic DNA digest of Leuconostoc mesenteroides ssp. dextranicum NZDRI 2218. The DNA sequence of this ISS1-like element (IS1297) and the Le. mesenteroides sequences flanking the IS were determined and compared with other iso-ISS1 elements. No direct repeats were found immediately flanking IS1297; however, direct repeats were present approximately 60 bp on either side of the insertion site. IS1297 contained a major open reading frame (ORF) of 681 bp, encoding a putative 226-amino-acid protein with 96.5% homology to the presumed transposase of ISS1. An overlapping ORF of 174 bp in the same orientation was also present. A putative ORF in the opposite orientation to the transposase ORF, which has been shown in some iso-ISS1 elements, was not present in IS1297. IS1297 was shown to hybridize with other dairy Leuconostoc strains. This is the first sequence of an ISS1-like element from a genus other than Lactococcus; however, IS1297 has close similarity to the lactococcal iso-ISS1 elements, especially the iso-ISS1 element from the lactose plasmid, pTD1.
New Zealand Dairy Research Institute, Palmerston North, New Zealand. lawrence.ward@nzdri.org.nz
L J
LJ
Ward
J C
JC
Brown
G P
GP
Davey
D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D004254:DNA Nucleotidyltransferases / Q000235:genetics; D017931:DNA Primers; D004251:DNA Transposable Elements / Q000235:genetics*; D013294:Lactococcus lactis / Q000235:genetics*; D007934:Leuconostoc / Q000235:genetics*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012091:Repetitive Sequences, Nucleic Acid; D019895:Transposases
D017931:DNA Primers; D004251:DNA Transposable Elements; D004254:DNA Nucleotidyltransferases; D019895:Transposases