A: T4 RNA Ligase 2 is an ATP-dependent RNA ligase that catalyzes phosphodiester bond formation between nucleic acids.
A: ATP activates the enzyme by forming an enzyme-AMP intermediate, which transfers AMP to the 5′-phosphate of the donor nucleic acid, enabling ligation.
A: This is a full-length clone T4 RNA Ligase 2.
A: T4 RNA Ligase 1 ligates ssRNA end-to-end, while T4 RNA Ligase 2 specializes in nick ligation in double-stranded nucleic acids in a template-dependent manner.
A: T4 RNA Ligase 2 shows high activity on nicked double-stranded RNA because it evolved to specialize in repairing and modifying RNA duplexes. In contrast, T4 RNA Ligase 1 evolved to function primarily on single-stranded substrates. These evolutionary differences in their natural cellular roles explain why Ligase 2 efficiently seals nicks in dsRNA, while Ligase 1 does not.
A: Use a splint molecule for ssRNA substrates, maintain optimal ATP concentration, and incubate at recommended temperatures (usually 25-37°C).
A: A splint molecule provides complementary base pairing that aligns the ends of the ssRNA correctly, enabling efficient ligation.
A: Include a no-enzyme control, a no-ATP control, and a positive control with known ligation efficiency to validate results.
