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Bacterial classifications derived from recA protein sequence comparisons

S Karlin1, G M Weinstock, V Brendel

  • 1Department of Mathematics, Stanford University, California 94305-2125, USA.

Journal of Bacteriology
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

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RecA protein comparisons reveal evolutionary insights into bacterial classification. Sequence analysis subclassified proteobacteria and gram-positive bacteria, suggesting mosaic evolution of RecA.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • RecA protein is crucial for DNA repair and recombination in bacteria.
  • Understanding RecA evolution can illuminate bacterial phylogeny and classification.

Purpose of the Study:

  • To compare RecA protein sequences from diverse bacterial species.
  • To investigate the evolutionary relationships and classification of bacteria using RecA sequence data.

Main Methods:

  • Comparative sequence analysis of 62 eubacterial RecA proteins.
  • Utilized a novel method based on significant segment pair alignment for pairwise similarity scores.
  • Grouped sequences based on high similarity scores and consistent score ranges.

Main Results:

Related Experiment Videos

  • Subclassified gamma-proteobacteria into vertebrate host and soil habitat groups.
  • Identified two distinct groups within alpha-proteobacteria; beta-proteobacteria classification is complex.
  • Gram-positive bacteria split into three low and three high G+C content groups, though not uniformly homogeneous.
  • Eukaryotic RAD proteins and bacteriophage T4 UvsX protein showed specific alignment patterns with bacterial RecA.

Conclusions:

  • RecA sequence comparisons provide a basis for bacterial subclassification.
  • The distribution of conserved regions suggests a mosaic evolution of the RecA protein.
  • Highlights potential inconsistencies in bacterial classifications derived solely from RecA sequence data.