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Two independent retrons with highly diverse reverse transcriptases in Myxococcus xanthus
S Inouye1, P J Herzer, M Inouye
1Department of Biochemistry, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, Piscataway 08854.
Summary
Myxococcus xanthus possesses two distinct retrons, genetic elements responsible for synthesizing multicopy single-stranded DNA (msDNA). Structural analysis reveals similarities and differences in these retron systems, suggesting diverse evolutionary origins.
Area of Science:
- Molecular Biology
- Bacterial Genetics
- Genomics
Background:
- Myxococcus xanthus, a Gram-negative soil bacterium, harbors a reverse transcriptase (RT).
- This RT is linked to a retron element responsible for synthesizing multicopy single-stranded DNA (msDNA).
Purpose of the Study:
- To investigate the presence and characteristics of retron elements in M. xanthus.
- To analyze the structural organization and sequence homology of a retron system responsible for msDNA-Mx65 synthesis.
Main Methods:
- Structural analysis of the retron element for msDNA-Mx65.
- Sequence alignment and comparison of the open reading frame (ORF) with known reverse transcriptase sequences.
Main Results:
- M. xanthus contains two independent, unlinked retrons, producing msDNA-Mx162 and msDNA-Mx65.
- The retron for msDNA-Mx65 shares a similar gene arrangement (msdRNA, msDNA, ORF) with the Mx162 retron.
- The ORF encodes a 427-amino acid polypeptide with a conserved reverse transcriptase domain (47% identity to Mx162 RT) and a divergent N-terminal domain.
Conclusions:
- M. xanthus possesses at least two distinct retron systems.
- The identified retron elements exhibit both conserved and divergent features, suggesting independent evolutionary trajectories.