The RecA protein is highly conserved at the amino-acid sequence level
between even distantly related bacterial species. This conservation of sequence
suggests that the function of RecA is also highly conserved.
Here are some alignments of RecA proteins generated using the ClustalW program (with a few manual modifications by myself):
Here are pretty print files with conserved positions highlighted for a sample of RecAs from some distantly related species of bacteria.
Here are some other alignments (from my J. Mol. Evol. paper)
Check out the RecA Prosite Entry
Check out the RecA Blocks Entry
Check out the RecA HSSP Entry
Check out the RecA Fingerprint from the Print Motif Database
Check out the RecA section of the Protein Family Database