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Degradative plasmids from sphingomonads.

Andreas Stolz1

  • 1Institut für Mikrobiologie, Universität Stuttgart, Stuttgart, Germany.

FEMS Microbiology Letters
|October 12, 2013
PubMed
Summary

Sphingomonadaceae megaplasmids facilitate the degradation of diverse pollutants. This study classifies these plasmids into three groups based on replication, partition, and conjugation proteins, aiding in understanding their catabolic functions.

Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Sphingomonadaceae bacteria harbor large plasmids (megaplasmids) enabling degradation of recalcitrant compounds.
  • Recent genome sequencing projects have revealed numerous sphingomonad plasmids.

Purpose of the Study:

  • To classify sphingomonad megaplasmids based on genetic elements.
  • To understand the role of these plasmids in the catabolic flexibility of sphingomonads.

Main Methods:

  • Comparative sequence analysis of plasmid-encoded proteins.
  • Classification based on replication initiation (Rep) proteins, plasmid partition (ParAB) proteins, and conjugation (tra/vir) genes.
  • Analysis of publicly available plasmid sequences.

Main Results:

Keywords:
biodegradationconjugationincompatibility groupsreplication initiation (Rep) proteins

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  • Sphingomonad plasmids encode four main groups of replication initiation (Rep) proteins: RepA_C, Rep_3, RPA, and HTH-36.
  • 'Degradative megaplasmids' involved in xenobiotic degradation fall into three groups based on their Rep proteins (RepA_C, Rep_3, or RPA).
  • Plasmid partition proteins (ParAB) and conjugation genes (tra/vir-like) further support this classification and suggest conjugative transfer capabilities.

Conclusions:

  • Sphingomonad megaplasmids can be classified into distinct groups based on key protein families involved in their maintenance and transfer.
  • This classification provides insights into the genetic basis of the catabolic versatility of Sphingomonadaceae.
  • The identified transfer functions suggest potential for horizontal gene transfer of these degradative plasmids.