The present invention provides a 5'-
methylthioadenosine phosphorylase mutant, the
amino acid sequence of which is derived from a
mutation of the sequence shown in SEQ ID No. 3 of the sequence table, wherein the
mutation is selected from at least one of the following: H64A, P131D, W114N, L206S, E168Q, F217V, F217S, F217W, R219A, R219Q, R219F, V184A and V184T. The present invention also provides its application in the catalytic synthesis of 2'-fluoro-2'-
deoxyadenosine. The
mutant H64A / W114N / L206S of the present invention has an
enzyme activity of 1.31 U / g, while the ApMTAP unmutated
enzyme strain has an
enzyme activity of 0.11 U / g, which is about 12 times higher than the enzyme activity, that is, the yield of 2'-fluoro-2'-
deoxyadenosine has been greatly improved, and is suitable for the field of
enzyme catalysis.