Related Experiment Videos
Evolutionary conservation of RecA genes in relation to protein structure and function
1Department of Mathematics, Stanford University, Stanford, California 94305-2125, USA.
Journal of Bacteriology
|April 1, 1996
Summary
Evolutionary analysis of RecA protein reveals conserved regions critical for ATP binding and DNA interaction. These findings illuminate RecA
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Structural Biology
Background:
- The RecA protein is essential for homologous recombination and DNA repair in bacteria.
- Understanding RecA's structure-function relationships is crucial for deciphering its biological roles.
Purpose of the Study:
- To investigate the evolutionary conservation of functional and structural regions within the RecA protein.
- To identify key amino acid residues and segments important for RecA's activity.
Main Methods:
- Comparative analysis of 63 eubacterial RecA protein sequences.
- Evaluation of evolutionary conservation patterns across different RecA regions.
- Correlation of conservation data with known RecA mutation studies and functional assays.
Main Results:
- Identified invariant amino acid segments corresponding to the ATP-binding A site and a novel segment (residues 145-149) near the ATP hydrolysis B site.
- Observed conservation of residues at the monomer-monomer interface, suggesting electrostatic mediation of polymerization.
- Delineated regions involved in DNA interaction, LexA binding, and filament-filament contacts.
- Proposed Arginine 243 as a key site for DNA and LexA binding competition.
Conclusions:
- The study highlights the functional significance of conserved regions in RecA, including a previously unassigned segment.
- Electrostatic interactions play a major role in RecA monomer polymerization.
- Conservation patterns provide insights into RecA's DNA binding mechanism and interactions with other proteins.