Nucleic Acids Res. 2003 Dec 15;31(24):7247-54 doi:10.1093/nar/gkg914

Blondal T, Hjorleifsdottir SH, Fridjonsson OF, Aevarsson A, Skirnisdottir S, Hermannsdottir AG, Hreggvidsson GO, Smith AV, Kristjansson JK.

Discovery and characterization of a thermostable bacteriophage RNA ligase homologous to T4 RNA ligase 1.

Optimal pH between 6 and 7. Enhanced by 25% PEG 6000 and 1 mM HCC.