In high-quality sake brewing, the cerulenin-resistant sake yeast K1801 with high ethyl caproate-producing ability has been used widely; however, K1801 has a defective spindle assembly checkpoint (SAC). To identify the mutation causing this defect, we first searched for sake yeasts with a SAC-defect like K1801 and found that K13 had such a defect. Then, we searched for a common SNP in only K1801 and K13 by examining 15 checkpoint-related genes in 23 sake yeasts, and found 1 mutation, R48P of Cdc55, the PP2A regulatory B subunit that is important for the SAC. Furthermore, we confirmed that the Cdc55-R48P mutation was responsible for the SAC-defect in K1801 by molecular genetic analyses. Morphological analysis indicated that this mutation caused a high cell morphological variation. But this mutation did not affect the excellent brewing properties of K1801. Thus, this mutation is a target for breeding of a new risk-free K1801 with normal checkpoint integrity.

• PMID: 27191586
• DOI full text
• PubMed
• PubTator

Reference Type

Journal Article

Authors

Goshima T, Nakamura R, Kume K, Okada H, Ichikawa E, Tamura H, Hasuda H, Inahashi M, Okazaki N, Akao T, ... Show all

Primary Lit For

Additional Lit For

Review For