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Article Abstract
The aim of this study was to establish one of the most efficient biocatalytic processes for turanose production by applying a robust (AS) mutant developed through site-directed mutagenesis. A gene encoding the amylosucrase of (AS) was cloned and used as a mutagenesis template. Among the AS variants generated by the site-directed point mutation, four different single-point mutants (P200R, V202I, Y265F, and Y414F) were selected to create double-point mutants, among which AS displayed the greatest turanose productivity without losing the thermostability of native AS. The turanose yield of AS reached 89.3% at 50 °C after 6 h with 1.0 M sucrose + 1.0 M fructose. AS produced significantly more turanose than AS-wild type (WT) by 2 times and completed the reaction faster by another 2 times. Thus, turanose productivity (82.0 g/(L h)) by AS was highly improved from 28.1 g/(L h) of AS-WT with 2.0 M sucrose + 0.75 M fructose.
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