The invention includes methods for identifying polymerases, such as modified terminal nucleotidyl transferases (TdT), that are capable of binding nucleotides comprising removable 3′-O-blocking moieties to a nucleic acid initiator, without the use of a template. The invention further includes the identified polymerases, and methods of using the polymerases for de novo synthesis of predetermined oligonucleotide sequences.
本发明包括鉴定聚合酶的方法,如修饰的末端核苷酸转移酶(TdT),这种聚合酶能够在不使用模板的情况下将包含可移动的 3′-O-阻遏分子的核苷酸与核酸
引发剂结合。本发明还包括已鉴定的聚合酶,以及使用这些聚合酶从头合成预定寡核苷酸序列的方法。