Using the pBluescript II/SBgl3 plasmid as a template, the mature
SBgl3 gene with and without a polyhistidine tag was PCR-amplified
using the SBgl3-F-1 primer containing a XhoI site and either the
SBgl3-R-1 or SBgl3-R-His primer, which both contained XbaI sites.
After digestion with XhoI and XbaI, the PCR product was cloned
into the vector pPICZaA (Invitrogen). The construct was confirmed
by DNA sequencing carried out by Macrogen and designated
pPICZaA/SBgl3His. The pPICZaA/SBgl3His plasmid was linearized
with SacI and transformed into P. pastoris GS115 by electroporation.
Positive transformants harboring the SBgl3 gene were selected
on YPDS plates containing 100 lg/ml zeocin.