Homologous bacterial metalloproteases ECP32⁄grimelysin from Serratia grimesiiand protealysin fromSerratia proteamaculansare involved in the invasion of the nonpathogenic bacteria in eukaryotic cells and are sug-gested to translocate into the cytoplasm [Bozhokina ESet al. (2011) Cell Biol Int35, 111–118].