Abstract
The methanol–glycerol co-feeding during the induction stage for heterologous protein production in Pichia pastoris has shown significant productive applications. Available model analysis applied to this dual-limited condition is scarce and normally does not consider the interaction effects between the substrates. In this work, a dual-limited growth model of P. pastoris considering an interactive kinetic effect was applied to an optimised fed-batch process production of heterologous Rhizopus oryzae lipase (ROL). In the proposed model, the growth kinetics on glycerol is fully expressed, whereas methanol kinetics is modulated by the co-metabolisation of glycerol, resulting in an enhancing effect of glycerol-specific growth rate. The modelling approach of fed-batch cultures also included the methanol volatilisation caused by the aeration that was found to be a not-negligible phenomenon. The model predicts the ability of P. pastoris to keep control of the methanol concentration in the broth during ROL-optimised production process in fed batch and fits satisfactorily the specific cell growth rate and ROL production. Implications of interaction effect are discussed applying the general procedure of modelling approach.
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Abbreviations
- µ:
-
Specific growth rate (h−1)
- µin :
-
Enhancing growth rate parameter (h−1)
- D:
-
Dilution rate (h−1)
- X:
-
Biomass concentration (g l−1)
- V:
-
Volume of broth (l)
- S:
-
Substrate concentration (g l−1)
- KS :
-
Half-saturation constant (g l−1)
- KI :
-
Methanol inhibition constant (g l−1)
- q:
-
Specific substrate consumption rate (g gX−1 h−1)
- YX/G :
-
Glycerol yield coefficient (gX gG−1)
- YX/M :
-
Methanol yield coefficient (gX gM−1)
- \({Y_{X/G}}^{{Ov}}\) :
-
Overall glycerol yield coefficient (gX gG−1)
- \({Y_{X/M}}^{{Ov}}\) :
-
Overall methanol yield coefficient (gX gM−1)
- kev :
-
Volatilisation first-order constant (h−1)
- qP :
-
Specific ROL productivity (UA gX−1 h−1)
- F:
-
Feed rate (l h−1)
- β(0, 1, 2, 3, 4, 5) :
-
Polynomial coefficients
- Max:
-
Maximal
- 0:
-
Initial
- M:
-
Methanol
- G:
-
Glycerol
- 1:
-
Metabolic glycerol pathway
- 2:
-
Metabolic methanol pathway
- f:
-
Feed
- Des:
-
Designed
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Acknowledgements
This work was supported by Project N°11110486 from Fondo Nacional de Ciencia y Tecnología (FONDECYT, Chile). C. Canales wishes to thank Comisión Nacional de Investigación Científica y Tecnológica (CONICYT, Chile) for scholarship support.
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Canales, C., Altamirano, C. & Berrios, J. The growth of Pichia pastoris Mut+ on methanol–glycerol mixtures fits to interactive dual-limited kinetics: model development and application to optimised fed-batch operation for heterologous protein production. Bioprocess Biosyst Eng 41, 1827–1838 (2018). https://doi.org/10.1007/s00449-018-2005-1
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DOI: https://doi.org/10.1007/s00449-018-2005-1