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- W2260908209 abstract "An intracellular levansucrase gene, lscR from Rahnella aquatilis ATCC15552, was cloned and its nucleotide sequence was determined. Nucleotide sequence analysis of this gene revealed a 1,248 bp open reading frame coding for a protein of 415 amino acids. The levansucrase was expressed by using a T7 promoter in Escherichia coli BL21 (DE3) and the enzyme activity was detected in the cytoplasmic fraction. The optimum pH and temperature of this enzyme for levan formation was pH 6 and 30°C, respectively. The deduced amino acid sequence of the lscR gene showed a high sequence similarity (59-89%) with Gram-negative levansucrases, while the level of similarity with Gram-positive enzymes was less than 42%. Multiple alignments of levansucrase sequences reported from Gram-negative and Gram-positive bacteria revealed seven conserved regions. A comparison of the catalytic properties and deduced amino acid sequence of lscR with those of other bacterial levansucrases strongly suggest that Gram-negative and Gram-positive levansucrases have an overall different structure, but they have a similar structure at the active site." @default.
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- W2260908209 date "2001-01-01" @default.
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- W2260908209 title "Cloning and sequence analysis of a levansucrase gene from Rahnella aquatilis ATCC15552" @default.
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