* Mutagenesis (GeneEditor in vitro Site-Directed Mutagenesis System Kit, Promega) on pHA-Pph21 was performed using the following primers: Fw 5’-GCAGAAAGACGCCAGATTACTTTGCATGAGTATGTATACATATATGCATC-3’ Rev 5’-GATGCATATATGTATACATACTCATGCAAAGTAATCTGGCGTCTTTCTGC-3’ Substituted residues leading to Leu369Ala mutation are indicated in bold.