In a subset of species that make coenzyme PQQ (pyrrolo-quinoline-quinone), this probable peptidase is found in the PQQ biosynthesis region and is thought to act as a protease on PqqA (TIGR02107), a probable peptide precursor of the coenzyme. PQQ is required for some glucose dehydrogenases and alcohol dehydrogenases. [Biosynthesis of cofactors, prosthetic groups, and carriers, Other]
Jiyao W et al.(2023). "The conserved domain database in 2023.",