title: Synthesis and physical characterization of the self-complementary, alternating pyrimidine/purine hexanucleotide d[CGTACG].
abstract: The hexanucleotide d(CGTACG) has been synthesized by a phosphotriester method in which, for the first time, an O-6 protected deoxyguanosine derivative has been used to avoid side reactions of the guanine residues. Conformational analysis by circular dichroism shows that d(CGTACG) maintains a B form under conditions (5 M NaCl) where the all C/G hexanucleotide d(CG)3 adopts a Z form, even though d(CGTACG) is a fully alternating pyrimidine/purine molecular. The delta H for the helix-to-coil transition has been measured.
mesh_terms: D001483:Base Sequence; D002942:Circular Dichroism; D007202:Indicators and Reagents; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis*; D009841:Oligonucleotides / Q000138:chemical synthesis*; D013816:Thermodynamics
chemical_list: D007202:Indicators and Reagents; D009838:Oligodeoxyribonucleotides; D009841:Oligonucleotides