This protein specifically catalyzes the removal of signal peptides from prolipoproteins. Release of signal peptides from bacterial membrane prolipoproteins. Hydrolyzes -Xaa-Yaa-Zaa-|-(S,diacylglyceryl)Cys-, in which Xaa is hydrophobic (preferably Leu), and Yaa (Ala or Ser) and Zaa (Gly or Ala) have small, neutral side chains. Protein modification; lipoprotein biosynthesis (signal peptide cleavage). Belongs to the peptidase A8 family.