Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.649515
Title: Genetic analysis of yeast RNase MRP
Author: Dichtl, Bernhard
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1998
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Abstract:
RNase MRP is a ribonucleoprotein particle (RNP) with endoribonucleolytic activity which is involved in the processing of pre-rRNA at site A3. A genetic screen for mutants which are synthetic lethal (sl) with a temperature sensitive (ts) mutation in the RNA component of RNase MRP (rrp2-1) has been performed in order to identify new gene products which physically and/or functionally interact with RNase MRP. Analysis of the obtained sl mutant strains led to the identification of a new and essential gene, POP3. Depletion of Pop3p in vivo results in a phenotype characteristic of the loss of RNase MRP activity; A3 cleavage is inhibited, leading to under-accumulation of the short form of the 5.8S rRNA (5.8SS) and formation of an aberrant 5.8S rRNA precursor which is 5' extended to site A2. Pop3p depletion also inhibits pre-tRNA processing. Primary tRNA transcripts accumulate, as well as spliced but 5' and 3' unprocessed pre-tRNAs. The Pop3p depletion phenotypes resemble those previously described for mutations in components of RNase MRP and RNase P (rrp2-1, rpr1-1 and pop1-1). Immunoprecipitation of epitope tagged Pop3p efficiently co-precipitates the RNA components of both RNase MRP and RNase P. Thus, Pop3p is a common component of both RNPs and is required for the function of both enzymes in vivo. Strain SL158 carried a mutation in HAL2 which is sl in combination with rrp2-1. Hal2p is an enzyme that converts pAp (adenosine 3', 5' bisphosphate), a product of sulfate assimilation, into 5' AMP and Pi.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.649515  DOI: Not available
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