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    • 97. 发明申请
    • IMPROVED B-FRUCTOFURANOSIDASE
    • 改良的B-FRUCTOFURANOSIDASE
    • US20160319263A1
    • 2016-11-03
    • US15107500
    • 2014-12-26
    • B FOOD SCIENCE CO., LTD.MICROBIOPHARM JAPAN CO., LTD.
    • Takumi TOCHIOSaki NAKAMURAMisa YAHARATadashi FUJIIKeisuke TAMURA
    • C12N9/26C12P19/14
    • C12N9/2431C12P19/14C12Y302/01026
    • [Problem] To provide an improved β-fructofuranosidase which enables the production of kestose with high efficiency while reducing the amount of a by-product such as nystose produced during the production of kestose.[Solution] An improved β-fructofuranosidase comprising an amino acid sequence which is produced by introducing an amino acid mutation into an amino acid sequence for a β-fructofuranosidase having 60% or higher identity to the amino acid sequence for wild-type β-fructofuranosidase which is represented by SEQ ID NO: 2, wherein the amino acid mutation is such a mutation that, when amino acid sequence alignment is performed, a histidine (H) residue corresponding to the position 395 as numbered from the N-terminal of the amino acid sequence for the wild-type β fructofuranosidase which is represented by SEQ ID NO: 2 can be replaced by an arginine (R) residue or a lysine (K) residue.
    • [解决方案]一种改进的β-呋喃果糖苷酶,其包含通过将氨基酸突变引入与野生型β-呋喃果糖苷酶的氨基酸序列具有60%或更高同一性的β-呋喃果糖苷酶的氨基酸序列而产生的氨基酸序列 其由SEQ ID NO:2表示,其中氨基酸突变是这样的突变,当进行氨基酸序列比对时,对应于从氨基的N末端编号的位置395的组氨酸(H)残基 由SEQ ID NO:2表示的野生型β呋喃果糖苷酶的酸序列可以被精氨酸(R)残基或赖氨酸(K)残基所代替。