title: Chemical synthesis of tridecanucleoside dodecaphosphate sequence of SV40 DNA.
abstract: The preparation, by the phosphotriester approach, of d[C-T-A-T-T-C-C-A-G-A-A-G-T] from one tetranucleoside triphosphate and three trinucleoside diphosphate blocks is described. The use of the o-dibromomethylbenzoyl (DBMB) protecting group in oligodeoxyribonucleotide synthesis is described for the first time. Internucleotide linkages are protected by o-chlorophenyl groups which are finally removed by treatment with the N1, N1, N3, N3-tetramethylguanidinium salt of syn-4-nitrobenzaldoxime. The first phosphorylation step (leading to phosphodiester intermediates) is carried out by treatment with o-chlorophenyl phosphorodi-(1,2,4-triazolide) followed by treatment with water and triethylamine. 1-Mesitylenesulphonyl-3-nitro-1,2,4-triazole (MSNT) is used as the activating agent in the second phosphorylation step in which 5'-protected mono- and di-nucleotides are condensed with nucleoside building blocks containing unprotected 3'-hydroxy functions.
mesh_terms: D001483:Base Sequence; D004279:DNA, Viral / Q000138:chemical synthesis*; D008722:Methods; D011089:Polydeoxyribonucleotides / Q000138:chemical synthesis*; D013539:Simian virus 40 / Q000378:metabolism*
chemical_list: D004279:DNA, Viral; D011089:Polydeoxyribonucleotides