USER™（尿嘧啶-特异性切除试剂）酶在尿嘧啶位置产生一个单核苷酸缺口。USER 酶是尿嘧啶 DNA 糖基化酶（UDG）和 DNA 糖基化酶-裂解酶 Endo VIII 的混合物。UDG 催化尿嘧啶碱基的切割，形成一个脱碱基（脱嘧啶）位点，但保持磷酸二酯骨架结构完整。Endo VIII 的裂解酶活力使脱碱基位点 3´ 和 5´ 端的磷酸二酯键断裂，释放无碱基的脱氧核糖。

T4 PDG（T4 嘧啶二聚体糖基化酶）既有 DNA 糖基化酶活性，又有 AP 裂解酶活性。16 KD 的蛋白质可识别因紫外线照射引起的 cis-syn 型环丁烷嘧啶二聚体。该酶切割嘧啶二聚体的 5´ 端糖苷键，同时其内切酶活性切割 AP 位点上的磷酸二酯键。

南极热敏 UDG (尿嘧啶-DNA 糖基化酶)能有效地水解单链或双链 DNA 上的尿嘧啶，产生的缺嘧啶位点，在高温或高 pH 下，极易水解断裂。升高温度和 pH 都会影响其水解活性。该产品对高温敏感，50℃ 以上就可以将酶完全失活。

Afu 尿嘧啶-DNA 糖基化酶（Afu UDG）是 E.coli 尿嘧啶-DNA 糖基化酶（UDG）热稳定的同源蛋白，来源于闪烁古生球菌（Archaeoglobus fulgidus）。该酶从含尿嘧啶的 DNA 上催化释放尿嘧啶，能有效地水解双链和单链 DNA 上的尿嘧啶。

biotechrabbit™ Heat Labile Uracil–DNA Glycosylase selectively degrades uracil-containing PCR products. After performing PCR or RT-PCR using dUTP instead of dTTP, PCR products remain intact after treatment with Heat Labile Uracil–DNA Glycosylase, whereas contaminating DNA (i.e., not amplified) is degraded. Heat Labile Uracil–DNA Glycosylase is completely and irreversibly inactivated by moderate heat treatment at 50⁰C, allowing contamination control in RT-qPCR. The enzyme hydrolyses the N-glycosylic bond between the deoxyribose sugar and the base in uracil-containing DNA leaving an abasic (apyrimidinic) site in DNA but does not modify uracils in RNA. Heat Labile Uracil–DNA Glycosylase is highly active at 20–40°C. No cofactors or divalent cations are required for activity, and the enzyme is active in most PCR and RT-PCR buffers. Although the enzyme is active a pH 6.5–9.0, the optimal pH 7.5 is in 50 mM NaCl.

E. coli 尿嘧啶-DNA 糖基化酶（UDG）催化从含尿嘧啶的 DNA 上释放尿嘧啶。UDG 能有效地水解单链或双链 DNA 上的尿嘧啶，但不能从 6 碱基或更少的寡核苷酸上水解尿嘧啶。

biotechrabbit™ Heat Labile Uracil–DNA Glycosylase selectively degrades uracil-containing PCR products. After performing PCR or RT-PCR using dUTP instead of dTTP, PCR products remain intact after treatment with Heat Labile Uracil–DNA Glycosylase, whereas contaminating DNA (i.e., not amplified) is degraded. Heat Labile Uracil–DNA Glycosylase is completely and irreversibly inactivated by moderate heat treatment at 50⁰C, allowing contamination control in RT-qPCR. The enzyme hydrolyses the N-glycosylic bond between the deoxyribose sugar and the base in uracil-containing DNA leaving an abasic (apyrimidinic) site in DNA but does not modify uracils in RNA. Heat Labile Uracil–DNA Glycosylase is highly active at 20–40°C. No cofactors or divalent cations are required for activity, and the enzyme is active in most PCR and RT-PCR buffers. Although the enzyme is active a pH 6.5–9.0, the optimal pH 7.5 is in 50 mM NaCl.

Fpg（甲酰胺嘧啶 [fapy]-DNA 糖基化酶）也称作 8-氧代鸟嘌呤 DNA 糖基化酶，既有 N-端糖基化酶活性也有 AP-裂解酶活性。N-端糖基化酶活性可以切下双链 DNA 上受损的嘌呤碱基，产生一个脱嘌呤（AP）位点。AP-裂解酶活性可以切割 AP 位点的 3´ 或 5´ 端，因此可以除去 AP 位点，产生一个具有 3´ 和 5´ 磷酸的碱基缺口。