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Protein Engineering, Vol. 14, No. 9, 663-667, September 2001
© 2001 Oxford University Press

Increasing the thermostability of Flavobacterium meningosepticum glycerol kinase by changing Ser329 to Asp in the subunit interface region

Shin-ichi Sakasegawa1,4, Hideki Takehara2, Issei Yoshioka1, Mamoru Takahashi1, Yoshitaka Kagimoto1, Hideo Misaki1, Haruhiko Sakuraba3 and Toshihisa Ohshima3

1 Asahi Kasei Corporation, Shizuoka 410-2321, 2 Molecular Gene Technics, Genetic Resource Technology, Kyushu University, Fukuoka 812-8581 and 3 Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, Tokushima 770-8506, Japan

The thermostability enhancement of Flavobacterium meningosepticum glycerol kinase (FGK) by random mutagenesis in the subunit interface region was investigated. A single Escherichia coli transformant, which produced a more thermostable glycerol kinase than the parent enzyme, was obtained. The nucleotide sequence of the gene of the mutant enzyme (FGK2615) was determined, and the four amino acid replacements were identified as Glu327 to Asp, Ser329 to Asp, Thr330 to Ala and Ser334 to Lys. Although the properties of FGK2615 were fundamentally similar to those of the parent enzyme, the thermostability and Km for ATP had changed. The thermostability of FGK2615 was apparently increased; the temperature at which the enzyme activity is inactivated by 50% for a 30-min incubation of FGK2615 was determined to be 72.1°C which was 3.1°C higher than that of the parent FGK. Four additional mutants each having a single amino acid replacement (Glu327 to Asp, Ser329 to Asp, Thr330 to Ala and Ser334 to Lys) were prepared and their thermostability and Km for substrates were evaluated. The effect of the substitution of Ser329 to Asp is discussed.


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