title: Effect on transcription of low-molecular-weight RNA from calf thymus chromatin.
abstract: 1. Two low-molecular-weight nuclear RNA fractions were isolated from the loosely-bound non-histone proteins of calf thymus chromatin: RNA I (of 4 - 5.5S, heterogeneous on polyacrylamide-gel electrohoresis), and RNA IV (of about 3S). 2. Under the reinitiation conditions, RNA I stimulates about 2.5-fold the template properties of homologous chromatin with bacterial RNA polymerase, while RNA IV inhibits these properties by about 50%. 3. When reinitiation is blocked, RNA I stimulates both the initiation and elongation steps (by 20 - 30% and 60%, respectively). 4. The two RNA fractions equally inhibit transcription (by 30 - 35%) with free homologous DNA as a template.
mesh_terms: D000818:Animals; D002417:Cattle; D002843:Chromatin; D066298:In Vitro Techniques; D008970:Molecular Weight; D012313:RNA / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D013698:Templates, Genetic; D013950:Thymus Gland; D014158:Transcription, Genetic
chemical_list: D002843:Chromatin; D012313:RNA