RRC ID 73915
Author Narazaki Y, Nomura Y, Morita K, Shimizu H, Matsuda F.
Title Expression of Saccharomyces cerevisiae cDNAs to enhance the growth of non-ethanol-producing S. cerevisiae strains lacking pyruvate decarboxylases.
Journal J Biosci Bioeng
Abstract Metabolic engineering of Saccharomyces cerevisiae often requires a restriction on the ethanol biosynthesis pathway. The non-ethanol-producing strains, however, are slow growers. In this study, a cDNA library constructed from S. cerevisiae was used to improve the slow growth of non-ethanol-producing S. cerevisiae strains lacking all pyruvate decarboxylase enzymes (Pdc-, YSM021). Among the obtained 120 constructs expressing cDNAs, 34 transformants showed a stable phenotype with quicker growth. Sequence analysis showed that the open reading frames of PDC1, DUG1 (Cys-Gly metallo-di-peptidase in the glutathione degradation pathway), and TEF1 (translational elongation factor EF-1 alpha) genes were inserted into the plasmids of 32, 1, and 1 engineered strains, respectively. DUG1 function was confirmed by the construction of YSM021 pGK416-DUG1 strain because the specific growth rate of YSM021 pGK416-DUG1 (0.032 ± 0.0005 h-1) was significantly higher than that of the control strains (0.029 ± 0.0008 h-1). This suggested that cysteine supplied from glutathione was probably used for cell growth and for construction of Fe-S clusters. The results showed that the overexpression of cDNAs is a promising approach to engineer S. cerevisiae metabolism.
Volume 126(3)
Pages 317-321
Published 2018-9-1
DOI 10.1016/j.jbiosc.2018.03.008
PII S1389-1723(17)30919-2
PMID 29636254
MeSH Cysteine / metabolism DNA, Complementary / genetics DNA, Complementary / metabolism Dipeptidases / genetics* Dipeptidases / metabolism Ethanol / metabolism* Gene Expression Regulation, Fungal Glutathione / metabolism Metabolic Engineering / methods* Metabolic Networks and Pathways / genetics Organisms, Genetically Modified Plasmids Pyruvate Decarboxylase / genetics* Pyruvate Decarboxylase / metabolism Saccharomyces cerevisiae* / enzymology Saccharomyces cerevisiae* / genetics Saccharomyces cerevisiae* / growth & development Saccharomyces cerevisiae* / metabolism Saccharomyces cerevisiae Proteins / genetics* Saccharomyces cerevisiae Proteins / metabolism
IF 2.366
Yeast pGK416