Stabilization of penicillin G acylase against pH by chemical cross-linking


Kazan D., Ertan H., Erarslan A.

PROCESS BIOCHEMISTRY, cilt.31, ss.135-140, 1996 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 31 Konu: 2
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1016/0032-9592(95)00038-0
  • Dergi Adı: PROCESS BIOCHEMISTRY
  • Sayfa Sayıları: ss.135-140

Özet

The effect of pHs between 2.0 and 10.0 on the inactivation kinetics of penicillin G acylase (PGA) obtained from a mutant of Escherichia coli ATCC 11105 and the stabilization of enzyme against pH by chemical cross-linking with dimethyladipimidate (DMA) were studied. The inactivation mechanisms of native and DMA cross-linked PGA both appeared to obey first-order inactivation kinetics during prolonged incubation of enzyme solutions at 40 degrees C and at different pH values. The lowest inactivation rate constants were obtained with both native and DMA cross-linked PGA at pH 7.0. Inactivation rate constants decreased with an increase in pH from 2.0 to 7.0 and then increased again at pH values above 7.0. Chemical cross-linking of PGA by DMA resulted in the stabilization of enzyme against pH. Highest enhancement of pH stabilization (nearly four-fold) was obtained at pH 7.0 and 8.0.