Needed for both DNA binding and transport. It is absolutely required for the uptake of transforming DNA but not for binding. Its role in binding may be indirect. Localizes in a nonuniform, punctate manner in competent cells, unlike some other competence proteins is not localized to the cell poles (PubMed:16009133). Expressed in cells competent for DNA transformation; that is 5-20% of the population (PubMed:16009133). Expression activated by ComK (PubMed:11918817).