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Applied and Environmental Microbiology, May 2001, p. 2083-2087, Vol. 67, No. 5
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.5.2083-2087.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Genetically Controlled Self-Aggregation of Cell-Surface-Engineered Yeast Responding to Glucose Concentration

Wen Zou, Mitsuyoshi Ueda, and Atsuo Tanaka*

Laboratory of Applied Biological Chemistry, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan

Received 6 November 2000/Accepted 2 March 2001

We constructed an arming (cell-surface-engineered) yeast displaying two types of agglutinin (modified a-agglutinin and alpha -agglutinin) on the cell surface, with agglutination being independent of both mating type and pheromones. The modified a-agglutinin was artificially prepared by the fusion of the genes encoding Aga1p and Aga2p. The modified a-agglutinin could induce agglutination of cells displaying Agalpha 1p (alpha -agglutinin). The upstream region of the isocitrate lyase gene of Candida tropicalis (UPR-ICL), active at a low glucose concentration, was used as the promoter to express the modified a-agglutinin- and alpha -agglutinin-encoding genes. The arming yeast displaying both agglutinins agglutinated and sedimented in response to decreased glucose concentration. When the glucose concentration was high, the arming yeast grew normally. In the late log phase, when the glucose concentration became very low, agglutination occurred suddenly and drastically and yeast cells sedimented completely. Sedimentation was confirmed by weighing the aggregated cells after filtration of the broth. Strains in which aggregation can be genetically controlled can be used in industrial processes in which the separation of yeast cells from the supernatant is necessary.


* Corresponding author. Mailing address: Laboratory of Applied Biological Chemistry, Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan. Phone: 81-75-753-5524. Fax: 81-75-753-5534. E-mail: atsuo{at}sbchem.kyoto-u.ac.jp.


Applied and Environmental Microbiology, May 2001, p. 2083-2087, Vol. 67, No. 5
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.5.2083-2087.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.






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