Article (Scientific journals)
Role of Dissimilative Pathway of Komagataella phaffii (Pichia pastoris): Formaldehyde Toxicity and Energy Metabolism.
Berrios, Julio; Theron, Chrispian; Steels, Sébastien et al.
2022In Microorganisms, 10 (7), p. 1466
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Keywords :
Komagataella phaffii; Pichia pastoris; dissimilative pathway; formaldehyde dehydrogenase; methanol; Virology; Microbiology (medical); Microbiology
Abstract :
[en] Komagataella phaffii (aka Pichia pastoris) is a yeast able to grow in methanol as the sole carbon and energy source. This substrate is converted into formaldehyde, a toxic intermediary that can either be assimilated to biomass or dissimilated to CO2 through the enzymes formaldehyde dehydrogenase (FLD) and formate dehydrogenase, also producing energy in the form of NADH. The dissimilative pathway has been described as an energy producing and a detoxifying route, but conclusive evidence has not been provided for this. In order to elucidate this theory, we generated mutants lacking the FLD activity (Δfld1) and used flux analysis to evaluate the metabolic impact of this disrupted pathway. Unexpectedly, we found that the specific growth rate of the Δfld1 strain was only slightly lower (92%) than the control. In contrast, the sensitivity to formaldehyde pulses (up to 8mM) was significantly higher in the Δfld1 mutant strain and was associated with a higher maintenance energy. In addition, the intracellular flux estimation revealed a high metabolic flexibility of K. phaffii in response to the disrupted pathway. Our results suggest that the role of the dissimilative pathway is mainly to protect the cells from the harmful effect of formaldehyde, as they were able to compensate for the energy provided from this pathway when disrupted.
Disciplines :
Biotechnology
Author, co-author :
Berrios, Julio ;  School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso 2340000, Chile
Theron, Chrispian  ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Microbial technologies ; GeneMill, Institute of Systems, Molecular and Integrative Biology, Biosciences Building, University of Liverpool, Crown Street, Liverpool L69 7BE, UK
Steels, Sébastien ;  Université de Liège - ULiège > Département GxABT > Microbial technologies
Ponce, Belén ;  School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso 2340000, Chile
Velastegui, Edgar;  School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso 2340000, Chile ; Microbial Processes and Interactions, TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Av. de la Faculté 2B, 5030 Gembloux, Belgium
Bustos Cosios, Cristina Veronica  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Altamirano, Claudia;  School of Biochemical Engineering, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2085, Valparaíso 2340000, Chile
Fickers, Patrick  ;  Université de Liège - ULiège > Département GxABT > Microbial technologies
Language :
English
Title :
Role of Dissimilative Pathway of Komagataella phaffii (Pichia pastoris): Formaldehyde Toxicity and Energy Metabolism.
Publication date :
20 July 2022
Journal title :
Microorganisms
eISSN :
2076-2607
Publisher :
MDPI AG, Switzerland
Volume :
10
Issue :
7
Pages :
1466
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ANID - Agencia Nacional de Investigación y Desarrollo [CL]
WBI - Wallonie-Bruxelles International [BE]
Available on ORBi :
since 24 November 2022

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