Molecular versatility: Unusual reactivities such as hydrolysis, nucleophilic aromatic substitution, and addition reactions of human orotidine‐5′‐monophosphate decarboxylase are explained by crystal structures and involve a nucleophilic lysine residue that normally is expected to act solely as a general base (RP=phosphoribosyl, R=CO2H, CN, acetyl, N3, I; R′=OH, SH, acetyl, hydroxymethyl).
分子多功能性:异常的反应性,例如
水解,亲核芳香族取代以及人orotidine-5'-单
磷酸脱羧酶的加成反应,都由晶体结构解释,并且涉及亲核赖
氨酸残基,通常预期其仅作为一般碱基起作用(RP =
磷酸核糖基,R = CO 2 H,CN,乙酰基,N 3,I; R′= OH,SH,乙酰基,羟甲基)。