title: Adaptive mutation of Acetobacter pasteurianus SKU1108 enhances acetic acid fermentation ability at high temperature.
abstract: In vitro adaptation is one of the most challenging subjects in biology to understand adaptive evolution. Microbial adaptation to temperature is not only interesting in terms of understanding the adaptation mechanism, but also useful for industrial applications. In this study, we attempted the in vitro adaptation of Acetobacter pasteurianus SKU1108 by repeating its cultivation under high-temperature acetic acid fermentation conditions. As a result, thermo-adapted strains having the higher fermentation ability than the wild-type strain were obtained. Mutations and/or disruptions in several proteins of the adapted strains were detected with NGS sequencing technology. In particular, two different adapted strains had mutations or disruptions in three specific genes in common, suggesting that these genes are essential for thermotolerance or fermentation at higher temperature. In order to clarify their involvement in thermotolerance, two of the three genes were disrupted and their phenotype was examined. The results showed that mutations of the two proteins, MarR and an amino acid transporter, are partly responsible for higher fermentation ability and/or thermotolerance. Thus, it was suggested that these elevated abilities of the adapted strains are acquired by assembling several single gene mutations including the above two mutations.
authors.affiliation: Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi 753-8515, Japan.
authors.forename: Minenosuke
authors.initials: M
authors.lastname: Matsutani
authors.forename: Mitsuteru
authors.initials: M
authors.lastname: Nishikura
authors.forename: Natsaran
authors.initials: N
authors.lastname: Saichana
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Hatano
authors.forename: Uraiwan
authors.initials: U
authors.lastname: Masud-Tippayasak
authors.forename: Gunjana
authors.initials: G
authors.lastname: Theergool
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Yakushi
authors.forename: Kazunobu
authors.initials: K
authors.lastname: Matsushita
mesh_terms: D019342:Acetic Acid / Q000378:metabolism*; D000091:Acetobacter / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D005285:Fermentation / Q000235:genetics / Q000502:physiology; D016680:Genome, Bacterial / Q000235:genetics; D009154:Mutation; D013696:Temperature
chemical_list: D001426:Bacterial Proteins; D019342:Acetic Acid