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Published on: July 7, 2026
DNA sequence analysis of a cryptic plasmid pL2 from Lactococcus lactis subsp. lactis
Shiao-Ming Chang1, Tsong-Rong Yan
1Institute of Bioengineering, Tatung University, Taipei, 104, Taiwan.
Abstract:
A cryptic plasmid pL2 was isolated from Lactococcus lactis subsp. lactis and its complete nucleotide sequence was determined (5,299 bp, GenBank accession No. DQ917780). Its replication mode was identified as a theta-type belonging to the pAM beta 1 family. Analysis of the nucleotide sequence revealed that pL2 contained a transfer origin, a replication origin, and five putative open reading frames (ORF1-5). ORF1 (386 amino acids) was homologous to replication protein RepB. The other open reading frames were cryptic. A small counter-transcript RNA (ctRNA) coding region was also observed.
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