PmPacifastin-like gene was identified from a SSH library of PmproPO1/2 knockdown shrimp.
PmPacifastin-like protein contains both pacifastin light chain- and kunitz-domains.
Suppression of PmPacifastin-like gene significantly increased shrimp PO activity.
PmPacifastin-like gene implicates in the negative regulation of the shrimp proPO system.