Isolation of copper-tolerant mutants of sake yeast with defective peptide uptake

Autor: Shodo Hara, Haruhiko Mizoguchi, Keiji Furukawa, Tasuku Yamada
Rok vydání: 2005
Předmět:
Zdroj: Journal of Bioscience and Bioengineering. 100:460-465
ISSN: 1389-1723
DOI: 10.1263/jbb.100.460
Popis: Mutants of Saccharomyces cerevisiae that have a decreased peptide uptake ability were isolated from sake yeast. A copper medium containing copper sulfate, histidylleucine and sodium lactate as a carbon source was used for the isolation. One mutant showed a decreased peptide uptake ability due to PTR2 transcriptional repression, but for other mutants, the decrease was not due to the transcriptional repression. The peptide concentration in sake brewed with these mutants increased to about 1.5-fold that of sake brewed with the parental strain. The angiotensin I-converting enzyme (ACE) inhibitory activity of sake brewed with the mutant was about 3.6-fold that of sake brewed with the parental strain.
Databáze: OpenAIRE