Pichia pastoris fermentation optimization

Energy state and testing a growth-associated model

Bradley A. Plantz, Jayanta Sinha, Lorelie Villarete, Kenneth Nickerson, Vicki L Schlegel

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A growth-associated model was applied to the production of recombinant ovine interferon-τ (rOvIFN-τ) with Pichia pastoris for the purpose of manufacturing preclinical and clinical active material. This model predicts that product yields will be the greatest when the specific growth of the culture is maintained at a steady and optimal rate. However, rOvIFN-τ yields did not meet the expected linear model but most closely corresponded to a polynomial relationship. After transitioning from glycerol to methanol, product accumulated for 31-45 h, and then the yield decreased. This production shift, which has been termed decoupling, was clearly related to time on methanol and not culture density. It was determined that a correlation exists between the decoupling point and a drop in energy state of the cell when expressing β-galactosidase. By assigning decoupling as a constraint that limits productivity and by reformulating the growth medium, the time prior to decoupling increased to 46.8±2.4 h, product yield improved for rOvIFN-τ from 203 to 337 mg l-1, and the coefficient of variation for yield decreased from 67.9 to 23.3%. A robust and stable fermentation process was realized, resulting in a 210% improvement in total yield from 557±357 to 1,172±388 mg.

Original languageEnglish (US)
Pages (from-to)297-305
Number of pages9
JournalApplied Microbiology and Biotechnology
Volume72
Issue number2
DOIs
StatePublished - Sep 1 2006

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Interferons
Pichia
Fermentation
Electron energy levels
Sheep
Methanol
Testing
Growth
Galactosidases
Glycerol
Linear Models
Productivity
Polynomials

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

Cite this

Pichia pastoris fermentation optimization : Energy state and testing a growth-associated model. / Plantz, Bradley A.; Sinha, Jayanta; Villarete, Lorelie; Nickerson, Kenneth; Schlegel, Vicki L.

In: Applied Microbiology and Biotechnology, Vol. 72, No. 2, 01.09.2006, p. 297-305.

Research output: Contribution to journalArticle

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