title: A comparative study of glycerol and sorbitol as co-substrates in methanol-induced cultures of Pichia pastoris: temperature effect and scale-up simulation.
abstract: The production of recombinant proteins by Pichia pastoris under AOX1 promoter is usually performed using methanol together with either glycerol or sorbitol as co-substrate. Although both co-substrates have been widely used, comparative studies are scarce. In addition, these comparisons have been performed at different specific growth rate (µ) that it is well known that has an important effect on productivity. Thus, the effect of using these co-substrates on the production of Rhyzopus oryzae lipase (ROL) by P. pastoris was compared in continuous cultures growing at the same µ at either 22 or 30 °C. Results show that using glycerol as co-substrate led to higher volumetric productivities, and lower specific and volumetric methanol consumption rates. Scale-up simulation with 10-10,000 L bioreactor sizes indicated that glycerol produced the highest volumetric productivity of ROL with lower aeration requirements. Therefore, glycerol rises as a better option than sorbitol in ROL production.
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso, Chile. julio.berrios@pucv.cl.
authors.forename: Julio
authors.initials: J
authors.lastname: Berrios
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso, Chile.
authors.forename: María-Olga
authors.initials: MO
authors.lastname: Flores
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso, Chile.
authors.forename: Alvaro
authors.initials: A
authors.lastname: Díaz-Barrera
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso, Chile.
authors.forename: Claudia
authors.initials: C
authors.lastname: Altamirano
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso, Chile.
authors.forename: Irene
authors.initials: I
authors.lastname: Martínez
authors.affiliation: School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso, Chile.
authors.forename: Zaida
authors.initials: Z
authors.lastname: Cabrera
mesh_terms: D019149:Bioreactors; D003470:Culture Media / Q000737:chemistry*; D005656:Fungal Proteins / Q000096:biosynthesis; D005990:Glycerol / Q000737:chemistry*; D007218:Industrial Microbiology; D008049:Lipase / Q000096:biosynthesis; D000432:Methanol / Q000737:chemistry*; D010843:Pichia / Q000201:enzymology*; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000096:biosynthesis; D012233:Rhizopus / Q000201:enzymology; D013012:Sorbitol / Q000737:chemistry*; D013696:Temperature
chemical_list: D003470:Culture Media; D005656:Fungal Proteins; D011994:Recombinant Proteins; D013012:Sorbitol; D008049:Lipase; D005990:Glycerol; D000432:Methanol
keywords: Continuous culture; Glycerol; Methanol induction; Pichia pastoris; Recombinant protein; Sorbitol