Multiple sequence alignment of the RAD52 protein superfamily. The coloring reflects the consensus at 90% conservation. The coloring scheme and secondary structure assignment abbreviations are as in Fig. 1. Species abbreviations are as follows: BPul36: Bacteriophage ul36. Cab: Clostridium acetobutylicum, Dr: Deinococcus radiodurans, Hs: Homo sapiens, Kla: Kluyveromyces lactis, NC: Neurospora crassa, Sc: Saccharomyces cerevisiae, Sp: Schizosaccharomyces pombe, Sparatyphi: Salmonella paratyphi A, Ralbus: Ruminococcus albus. The Shiga toxin-converting phage RAD52-like protein (gi: 17977996) is nearly identical to the Salmonella paratyphi A RAD52 like protein. The RAD52-like proteins from Bacteriophage ul36 (gi: 8248159) and Ruminococcus albus are respectively adjacent to genes encoding the single-strand binding protein and the λ-type exonuclease.