title: Size and turnover of polyadenylic acid-containing ribonucleic acids in a fragile mutant of Saccharomyces cerevisiae.
abstract: Ribonucleic acid-containing polyadenylic acid [poly(A)+-RNA] was studied in lysates from an osmotic-sensitive mutant of Saccharomyces cerevisiae characterized by low nuclease activity. The poly(A)+-RNA fraction, analyzed by electrophoresis in polyacrylamide-formamide gels, constitutes a heterogeneous population of molecules, with molecular weights ranging from 0.2 X 10(6) to 3 X 10(6) and having an average of 1.2 X 10(6). The turnover rate of poly(A)+-RNA was determined by the decay of radioactivity after a cold uracil chase, and the observed half-life of 21 min corresponds to about 10% of the cell doubling time. Poly(A)+-RNA was analyzed by gel electrophoresis under denaturing and non-denaturing conditions. A correlation was established between the apparent secondary structure and the turnover rate of poly(A)+-RNA species.
mesh_terms: D004591:Electrophoresis, Polyacrylamide Gel; D006207:Half-Life; D008970:Molecular Weight; D009154:Mutation; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D011061:Poly A / Q000378:metabolism; D012313:RNA / Q000032:analysis / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000378:metabolism*
chemical_list: D011061:Poly A; D012313:RNA