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Ohnishi S, Kawano-Kawada M, Yamamoto Y, Akiyama K, Sekito T. A vacuolar membrane protein Vsb1p contributes to the vacuolar compartmentalization of basic amino acids in Schizosaccharomyces pombe. Biosci Biotechnol Biochem 2022; 86:763-769. [PMID: 35289847 DOI: 10.1093/bbb/zbac041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 03/10/2022] [Indexed: 11/12/2022]
Abstract
Accumulation levels of Arg, Lys, and His in vacuoles of Schizosaccharomyces pombe cells were drastically decreased by the disruption of SPAC24H6.11c (vsb1+) gene identified by a homology search with the VSB1 gene of Saccharomyces cerevisiae. The Vsb1p fused with green fluorescent protein particularly localized at vacuolar membranes in S. pombe cells. Overexpression of vsb1+ markedly increased vacuolar levels of basic amino acids; however, overexpression of the vsb1D174A mutant did not affect the levels of these amino acids. These results suggest that the vsb1+ contributes to the accumulation of basic amino acids into the vacuoles of S. pombe, and the aspartate residue in the putative first transmembrane domain conserved among fungal homologs is crucial for the function of Vsb1p.
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Affiliation(s)
- Shota Ohnishi
- Laboratory of Molecular Physiology and Genetics, Faculty of Agriculture, Graduate School of Agriculture, Ehime University, Matsuyama, Japan
| | - Miyuki Kawano-Kawada
- Laboratory of Molecular Physiology and Genetics, Faculty of Agriculture, Graduate School of Agriculture, Ehime University, Matsuyama, Japan.,Division of Cell-Free Sciences, Proteo-Science Center, Ehime University, Matsuyama, Japan.,Advanced Research Support Center, Ehime University, Matsuyama, Japan
| | - Yusuke Yamamoto
- Laboratory of Molecular Physiology and Genetics, Faculty of Agriculture, Graduate School of Agriculture, Ehime University, Matsuyama, Japan
| | - Koichi Akiyama
- Laboratory of Molecular Physiology and Genetics, Faculty of Agriculture, Graduate School of Agriculture, Ehime University, Matsuyama, Japan.,Advanced Research Support Center, Ehime University, Matsuyama, Japan
| | - Takayuki Sekito
- Laboratory of Molecular Physiology and Genetics, Faculty of Agriculture, Graduate School of Agriculture, Ehime University, Matsuyama, Japan.,Division of Cell-Free Sciences, Proteo-Science Center, Ehime University, Matsuyama, Japan
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