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Appl Environ Microbiol

Title:		Genetically controlled self-aggregation of cell-surface-engineered yeast responding to glucose concentration
Author(s):		Zou W; Ueda M; Tanaka A;
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"
Journal Title:		Appl Environ Microbiol
Year:		2001
Volume:		67
Issue:		5
Page Number:		2083 - 2087
DOI:		10.1128/AEM.67.5.2083-2087.2001
ISSN/ISBN:		0099-2240 (Print) 1098-5336 (Electronic) 0099-2240 (Linking)
Abstract:		"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 Agalpha1p (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"
Keywords:		"*Agglutination Culture Media Gene Expression Regulation, Fungal Glucose/*pharmacology Isocitrate Lyase/genetics/metabolism Mating Factor Peptides/genetics/*metabolism Promoter Regions, Genetic Recombinant Fusion Proteins/metabolism Saccharomyces cerevisia;"
Notes:		"MedlineZou, W Ueda, M Tanaka, A eng Research Support, Non-U.S. Gov't 2001/04/25 Appl Environ Microbiol. 2001 May; 67(5):2083-7. doi: 10.1128/AEM.67.5.2083-2087.2001"