title: The regulatory region of MS2 phage RNA replicase cistron. III. Characterization of fragments resulting from S1 nuclease digestion.
abstract: The functionally active fragments MS2 R(-53 leads to 6) and MS2 R(-53 leads to 3) comprising the regulatory region for the replicase cistron have been isolated from MS2 RNA-coat protein complex following T1 RNase digestion. In order to obtain shorter fragments, active in coat protein binding and initiation of translation, MS2 R(-53 leads to 6) was cleaved with S1 nuclease. The results indicate that S1 nuclease attacks the most susceptible loop regions of the two hairpin helices of MSZ R(-53) leads to 6). Among the three fragments which have been isolated, only MS2 R(-35/33 leads to 6) containing the intact hairpin (b) region with initiation codon AUG is active in the coat protein binding. Functional activity exerted by another polynucleotide MS R(-17 leads to 6) supports the assumption that specific binding with the coat protein is determined by the hairpin (b) region prior to the replicase cistron.
mesh_terms: D001483:Base Sequence; D003090:Coliphages / Q000378:metabolism*; D005809:Genes, Regulator; D005814:Genes, Viral; D009690:Nucleic Acid Conformation; D009843:Oligoribonucleotides / Q000032:analysis; D012316:RNA Nucleotidyltransferases / Q000096:biosynthesis*; D012367:RNA, Viral / Q000378:metabolism; D012324:RNA-Dependent RNA Polymerase / Q000096:biosynthesis*; D006163:Ribonuclease T1; D012260:Ribonucleases; D014764:Viral Proteins / Q000032:analysis
chemical_list: D009843:Oligoribonucleotides; D012367:RNA, Viral; D014764:Viral Proteins; D012316:RNA Nucleotidyltransferases; D012324:RNA-Dependent RNA Polymerase; D012260:Ribonucleases; D006163:Ribonuclease T1