The present invention provides mutant nucleotidylyl-transferases, such as E
p
, having altered substrate specificity; methods for their production; and methods of producing nucleotide sugars, which utilize these nucleotidylyl-transferases. The present invention also provides methods of synthesizing desired nucleotide sugars using natural and/or modified E
p
or other nucleotidyltransferases; and nucleotide sugars sythesized by the present methods. The present invention further provides new glycosyl phosphates, and methods for making them.
本发明提供了突变核苷酸转移酶,例如Ep,具有改变的底物特异性;其生产方法;以及利用这些核苷酸转移酶生产核苷酸糖的方法。本发明还提供了使用天然和/或改性的Epor或其他核苷酸转移酶合成所需核苷酸糖的方法;以及通过本方法合成的核苷酸糖。本发明还提供了新的糖基
磷酸酯,以及制备它们的方法。