Nandakumar J, Shuman S.

J Biol Chem. 2005 Jun 24;280(25):23484-9. doi:10.1074/jbc.M500831200

Dual mechanisms whereby a broken RNA end assists the catalysis of its repair by T4 RNA ligase 2.

Complete Appylation by RNL2 is possible in absence of Mg2+, but is slower.