title: Preparation and properties of the repeating sequence polymers d(A-I-C)n-d(I-C-T)n and d(A-G-C)n-d(G-C-T)n.
abstract: The repeating sequence polymer d(A-I-C)n-d(I-C-T)n has been prepared using the chemically synthesized oligomers d(A-G-C)4 and d(C-T-G)4 and the DNA polymerase from Micrococcus luteus. The enzymatically synthesized polymer was used as template for preparation of d(A-G-C)n-d(G-C-T)n. Both deoxyribonucleotide polymers were characterized by nearest neighbor analyses, buoyant density measurements in cesium chloride and cesium sulfate, melting temperature, and circular dichroism (CD) spectra. The ribopolymers r(A-I-C)n-r(I-C-U)n and r(A-G-C)n-r(G-C-U)n were transcribed from d(A-I-C)n-d(I-C-T)n, and their CD spectra were compared with those of the respective deoxyribonucleotide polymers.
mesh_terms: D001483:Base Sequence; D002942:Circular Dichroism; D004254:DNA Nucleotidyltransferases / Q000378:metabolism; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology; D007700:Kinetics; D008837:Micrococcus / Q000201:enzymology; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D009841:Oligonucleotides / Q000138:chemical synthesis; D011119:Polynucleotides / Q000096:biosynthesis*; D013056:Spectrophotometry, Ultraviolet; D013698:Templates, Genetic; D014158:Transcription, Genetic
chemical_list: D009841:Oligonucleotides; D011119:Polynucleotides; D004254:DNA Nucleotidyltransferases; D012321:DNA-Directed RNA Polymerases