Anaerobic alpha-Amylase Production and Secretion with Fumarate as the Final Electron Acceptor in Saccharomyces cerevisiae
Journal article, 2013

In this study, we focus on production of heterologous alpha-amylase in the yeast Saccharomyces cerevisiae under anaerobic conditions. We compare the metabolic fluxes and transcriptional regulation under aerobic and anaerobic conditions, with the objective of identifying the final electron acceptor for protein folding under anaerobic conditions. We find that yeast produces more amylase under anaerobic conditions than under aerobic conditions, and we propose a model for electron transfer under anaerobic conditions. According to our model, during protein folding the electrons from the endoplasmic reticulum are transferred to fumarate as the final electron acceptor. This model is supported by findings that the addition of fumarate under anaerobic (but not aerobic) conditions improves cell growth, specifically in the alpha-amylase-producing strain, in which it is not used as a carbon source. Our results provide a model for the molecular mechanism of anaerobic protein secretion using fumarate as the final electron acceptor, which may allow for further engineering of yeast for improved protein secretion under anaerobic growth conditions.

ero1p

metabolism

systems biology

eukaryotes

stress

recombinant proteins

endoplasmic-reticulum

yeast

degradation

disulfide bond formation

Author

Zihe Liu

Chalmers, Chemical and Biological Engineering, Life Sciences, System Biology

Tobias Österlund

Chalmers, Chemical and Biological Engineering, Life Sciences, System Biology

Jin Hou

Chalmers, Chemical and Biological Engineering, Life Sciences, System Biology

Dina Petranovic Nielsen

Chalmers, Chemical and Biological Engineering, Life Sciences, System Biology

Jens B Nielsen

Chalmers, Chemical and Biological Engineering, Life Sciences, System Biology

Applied and Environmental Microbiology

0099-2240 (ISSN) 1098-5336 (eISSN)

Vol. 79 9 2962-2967

Industrial Systems Biology of Yeast and A. oryzae (INSYSBIO)

European Commission (FP7), 2010-01-01 -- 2014-12-31.

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Areas of Advance

Life Science Engineering (2010-2018)

Subject Categories

Chemical Sciences

DOI

10.1128/AEM.03207-12

More information

Created

10/8/2017