Thermophilic HB8 DNA ligase: effects of polyethylene glycols and polyamines on blunt-end ligation of DNA

Journal of Biochemistry
M Takahashi, T Uchida

Abstract

NB8 DNA ligase from an extract of Thermus thermophilus HB8 could catalyze blunt-end ligation in the presence of high concentration of polyethylene glycols (PEG) or in the presence of polyamines. In the presence of high molecular weight PEG 20,000, 6,000, or 1,000 (8-28%), the enzyme catalyzed blunt-end intermolecular joining to yield linear oligomers, but no circular DNA forms. But in the presence of low molecular PEG 400, 200 (8-80%), or the monomer, ethylene glycol (16-80%), the circular forms were also detected by intramolecular ligation. In the presence of polyamines, the blunt-end ligation products were linear oligomers and the optimum concentrations were as follows: caldopentamine (0.05 mM), thermine (0.1-0.2 mM), spermine (0.2 mM), thermospermine (0.4 mM), and sperminediol (0.75 mM). Spermidine and putrescine were less capable of producing oligomers. PEG and polyamines elevated the ligation temperature by HB8 DNA ligase. The optimum temperature of blunt-end ligation was about 65 degrees C.

Citations

Apr 7, 2007·Nucleic Acids Research·Yuk-Hang Chan, Joseph T Y Wong
Mar 23, 1987·FEBS Letters·M Takahashi, M Senshu
Mar 7, 2020·International Journal of Molecular Sciences·Yaping LiangLiangwei Liu
Aug 3, 2019·Cold Spring Harbor Protocols·Michael R Green, Joseph Sambrook

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