A single colony of recombinant P. pastoris GS115 carrying
pJT3 or pPIC9K from an MD plate was precultured in
20mL buffered minimal medium (BMG) (13.4 g L1 YNB
without amino acids, 4104 g L1 biotin, 10 g L1 glycerol
and 100mM potassium phosphate, pH 6.0) at 30 1C for 24 h
in a shaking incubator (OD600nm6–8). Cells were harvested,
pellets resuspended in 100mL BMM and grown at
30 1C for 7 days in a shaking incubator. Absolute methanol
was added at intervals of 24 h to a final concentration of
0.5% to maintain gene expression. Culture aliquots (1 mL)
were collected daily and cells were removed by centrifugation
at 8000 g for 15 min. The supernatant was assayed for
lipase activity as described above