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Nucleic Acids Research, 1984, Vol. 12, No. 21 8235-8251
© 1984

ENZYMOLOGY

Polymer-stimulated ligation: enhanced ligation of oligo- and polynucleotides by T4 RNA ligase in polymer solutions

Barbara Harrison and Steven B. Zimmerman

Laboratory of Molecular Biology, National Institute of Arthritis, Diabetes, and Digestive and Kidney Diseases, National Institutes of Health Bethesda, MD 20205, USA

Received August 13, 1984. Accepted October 5, 1984.

The effects of macromolecular crowding were tested on several reactions catalyzed by T4 RNA ligase. The rate of cyclization of oligoriboadenylates was stimulated up to 10-fold by relatively high concentrations of several polymers (polyethylene glycol (PEG) 8000 or 20,000; bovine plasma albumin; Ficoll 70). In addition, higher concentrations of PEG 8000 or PEG 20,000 allowed the novel formation of large linear products from the oligoriboadenylates. Also stimulated by high concentrations of PEG 8000 were the rate at which T4 RNA ligase joined p(dT)10 to oligoriboadenylates and the rate at which the enzyme activated p(dT)n by transfer of an adenylyl moiety from ATP to the oligonucleo-tides. These results with T4 RNA ligase are compared to earlier studies on the effects of crowding on DNA ligases.


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