FACTORS INFLUENCING GENETIC TRANSCRIPTION-INITIATION AND TERMINATION

影响基因转录起始和终止的因素

• 批准号: 4693710
• 负责人: R CROUCH
• 金额: --
• 依托单位: EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH & HUMAN DEVELOPMENT
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/4693710
• 关键词: DNA directed RNA polymerase; Escherichia coli; chromatography; electron microscopy; gel electrophoresis; genetic mapping; genetic transcription; immunochemistry; messenger RNA; molecular cloning; nucleic acid metabolism; nucleic acid sequence; ribonuclease III; ribosomal RNA

RNA plays an important role in cellular regulation -- either by its presence in active form or by its total absence. It has been known for several years that transcription of DNA does not necessarily lead to productive, mature RNA molecures. Cleavage of these RNA molecules often is required for the RNA molecules to mature or to act as an intermediate in other processes (e.g., priming of DNA replication). These cleavage events are a subset of a general maturation pathway known as RNA processing. Work of this Intramural Research Project is concerned with two types of RNA processing, generation of RNA primers for DNA replication and ribosomal RNA processing in higher eukaryotes. A mutant of rnh (Ribonuclease H) of E. coli is poorly viable in combination with recBC mutants. We have taken advantage of this observation to construct a double mutant (rnh, recBts) that is temperature sensitive for growth. Screening DNAs from a variety of sources has permitted us to clone (1) mutant E. coli rnh genes (2) a Salmonella ribonuclease H gene and (3) a DNA from Saccharomyces cervisiae. In a second area, we have demonstrated that U3RNA (a nuclear small RNA) can form relatively stable complexes with rRNA precursors. The latter observation supports the idea that U3RNA is involved in rRNA processing.

RNA在细胞调控中扮演着重要的角色——无论是通过它的