Optimization of temperature-glycerol -pH conditions for fed-batch fermentation process for recombinant hookworm (Ancylostoma caninurn) anticoagulant peptide (AcAP-5) production by Pichia pastoris

Authors

Mehmet InanFollow
Vijay Chiruvolu
Kent M. Eskridge, University of Nebraska-LincolnFollow
George P. Vlasuk
Kenneth Dickerson
Scott Brown
Michael M. MeagherFollow

ORCID IDs

Kent M. Eskridge

Date of this Version

12-10-1998

Comments

This paper was originally published in the Journal of “Enzyme and Microbial Technology © 1999 Elsevier Sciences Inc.

Abstract

This study was undertaken to determine the optimum pH, temperature and glycerol feed rate for the production of recombinant hookworm (Ancylostoma caninum) anticoagulant peptide (rAcAP-5) by Pichia pastoris using response surface methodology (RSM). A central composite design was used as an experimental design for allocation of treatment combinations in three blocks. The variables selected for study were pH, temperature and glycerol feed rate. pH was the most important variable affecting yield, specific yield and specific activity of rAcAP-5. Glycerol feed rate had a significant effect on the specific activity of rAcAP-5 (% of total secreted protein) while temperature did not have a significant effect on the responses. The data showed a trend that gave maximum responses and there was no blocking effect on the responses. The RSM formulated three second order polynomial empirical models relating to the responses. From these models it was possible to determine the optimum conditions variables for maximum yield of rAcAP-5 (1.2g I-1), the maximum specific yield of rAcAP-5 (11.5 mg g -1dry cell) and the maximum specific activity of rAcAP-5 (96% of total secreted protein).