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LldI, a plasmid-encoded type I restriction and modification system in Lactococcus lactis
1Cooperative Research Centre for Food Industry Innovation, Department of Biotechnology, University of New South Wales, Sydney, Australia.
DNA Sequence : the Journal of DNA Sequencing and Mapping
|November 25, 2000
Abstract:
A plasmid-encoded type I restriction and modification (R-M) system, designated LldI, was identified in Lactococcus lactis biovar diacetylactis LD10-1. LldI consists of three genes encoding endonuclease, methylase and specificity subunits, respectively. RT-PCR analysis revealed that the three genes are co-transcribed as a polycistronic mRNA in L. lactis. The specificity subunit of LldI differs significantly in the target recognition domains from those of other type I R-M systems, suggesting that LldI confers a novel specificity in L. lactis.