Mutant gene of xylanase in high acid-base reaction range and point mutation process thereof
A technology of xylanase and acid-base reaction, which can be used in genetic engineering, plant genetic improvement, botanical equipment and methods, etc. effect of tolerance
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Embodiment 1
[0027] Please refer to Fig. 1, embodiment 1 of the present invention mainly utilizes a point mutation method to mutate the 41st amino acid of a xylanase gene from asparagine to aspartic acid to form a high acid-base reaction Mutant genes for a range of xylanases. More specifically, the present invention uses the point mutation method to further form a mutant gene of xylanase with a high acid-base reaction range through the following steps:
[0028] The first step S1 is to produce the xylanase gene using a vector to form a first recombinant plastid, and then transform the first recombinant plastid into a competent cell to further form a wild type expression vector;
[0029] The second step S2 is to mix the first recombinant plasmid with a dNTP, a buffer solution [reactionbuffer], a forward primer [forward primer], a reverse primer [reverse primer] and a polymerase [ polymerase] carry out a polymerase chain reaction [polymerase chain reaction] to form a second recombinant plas...
Embodiment 2
[0044] Please refer to FIG. 2 and FIG. 7 , the gene sequence of the mutant xylanase gene of Example 2 of the present invention contains the sequence shown in FIG. 7 [Sequence ID number: 4, SEQ ID NO: 4].
[0045] In FIG. 7 , the region marked with a frame line is the position of the mutation, which is the 21st amino acid of sequence identification number: 4, and is aspartic acid. Wherein, because the sequence identification number: 4 is the gene sequence formed for the 21st to 200th amino acids in the sequence identification number: 3. Furthermore, it can be understood that although the mutated positions are different from the positions of Sequence Identification Number: 3 and Sequence Identification Number: 4, the positions of the mutated amino acids are substantially the same. Therefore, it can be found that the mutant gene of xylanase containing the gene sequence of SEQ ID NO: 4 also has the effect of improving the acid-base tolerance, acid-base reaction range and activity ...
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Abstract
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