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Nucleic Acids Research, 1989, Vol. 17, No. 13 4957-4974
© 1989

CHEMISTRY

Synthesis and properties of oligonucleotides containing 4-thiothyniidine, 5-methyl-2-pyrunidinone-1-ß-D(2'-dexoyriboside) and 2-thiothvmidine

Bernard A. Connolly and Patrick C. Newman

Department of Biochemistry, University of Southampton Bassett Crescent East, Southampton SO9 3TU, UK

Received April 21, 1989. Revised June 5, 1989. Accepted June 5, 1989.

Methods are given for the synthesis of derivatives of 4-thiothymidine (4ST), 5-methyl-2-pyrimidinone-l-ß-D(2'-deoxyriboside) (4HT) and 2-thiothymidine (2ST) suitable for incorporation into oligodeoxynucelotides by the cyanoethyl phosphoramidite method. 4HT and 2ST are incorporated with no base protection but the sulphur atom in 4ST is protected with an S-sulphenylmethyl (-SCH3) function. This can be removed with dithiothreitol after synthesis. These T analogues have been incorporated into GACGATATCGTC, a self-complementary dodecamer containing the Eco RV recognition site (underlined), in place of the two T residues within this site. Although pure dodecamers are obtained in each case the syntheses are not as efficient as those seen when normal unmodified bases are used mainly due to the chemical reactivity of 4ST, 4HT and 2ST. Some of the chemical properties of oligonucleotides containing these bases (reactivity towards NH3) as well as their physical properties (melting temperatures, U.V., fluorescence and circular dichroism spectra) have been determined and are discussed.


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