Peptidase A24, or the prepilin peptidase as it is also known, processes the N-terminus of the prepilins [1]. The processing is essential for the correct formation of the pseudopili of type IV bacterial protein secretion. The enzyme is found across eubacteria and archaea [2].

1: The type 4 prepilin peptidases comprise a novel family of aspartic acid proteases. LaPointe CF, Taylor RK; J Biol Chem 2000;275:1502-1510. PMID:10625704

2: Archaeal homolog of bacterial type IV prepilin signal peptidases with broad substrate specificity. Albers SV, Szabo Z, Driessen AJ; J Bacteriol 2003;185:3918-3925. PMID:12813086