Retron for the 67-base multicopy single-stranded DNA from Escherichia coli: A potential transposable element encoding both reverse transcriptase and Dam methylase functions

Hsu Mei-Yin Hsu, Inouye Masayori Inouye, Inouye Sumiko Inouye

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Abstract

The region (retron-Ec67) required for the biosynthesis of a branched-RNA-linked multicopy single-stranded DNA (msDNA-Ec67) from a clinical isolate of Escherichia coli was mapped at a position equivalent to 19 min on the K-12 chromosome. The element containing the retron consisted of a unique 34-kilobase sequence that was flanked by direct repeats of a 26-base-pair sequence found in the K-12 chromosomal DNA. This suggests that the 34-kilobase element was probably integrated into the E. coli genome by a mechanism related to transposition or phage integration. In the 34-kilobase sequence an open reading frame of 285 residues was found, which displays 44% sequence identity with the E. coli Dam methylase. Interestingly, there are three GATC sequences, the site of Dam methylation, in the promoter region of the gene for reverse transcriptase.

Original languageEnglish (US)
Pages (from-to)9454-9458
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume87
Issue number23
DOIs
StatePublished - 1990

All Science Journal Classification (ASJC) codes

  • General

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