Document Detail

The central region of the yeast U4 snRNA is not important for hammerhead catalysis, but may act as a domain spacer.
MedLine Citation:
PMID:  8643386     Owner:  NLM     Status:  MEDLINE    
Several distinct domains of U4 small nuclear (sn)RNA interact with other components of the spliceosome and are essential for pre-mRNA splicing. We have previously shown that single point mutations (Hu et al., 1995) in the central domain of the yeast U4 snRNA do not effect cell growth. In contrast to our results, this region has been reported to possess metal-binding or catalytic activity in vitro (Yang et al., 1994). In order to test if large mutations in the central domain effect cell growth and/or in vivo splicing, we have carried out further mutational analyses of this domain. A deletion of nucleotides from 62 to 88, including all those corresponding to the invariable positions of the hypothetical hammerhead, does not affect cell growth at/or above 25 degrees C. In addition, the central region (nucleotides 69-88) can be replaced by two copies of a 38-nt spacer inserted in the same orientation without any effect on cell growth or nuclear RNA splicing. These results suggest that the central domain of U4 snRNA functions primarily to separate the 5'- and 3'- domains of the snRNA by an optimal distance.
J Hu; D Field; A Wang; J D Friesen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Nucleic acids symposium series     Volume:  -     ISSN:  0261-3166     ISO Abbreviation:  Nucleic Acids Symp. Ser.     Publication Date:  1995  
Date Detail:
Created Date:  1996-07-17     Completed Date:  1996-07-17     Revised Date:  2010-04-28    
Medline Journal Info:
Nlm Unique ID:  8007206     Medline TA:  Nucleic Acids Symp Ser     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  25-8     Citation Subset:  IM    
Department of Molecular and Medical Genetics, University of Toronto, Ontario, Canada.
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MeSH Terms
Base Sequence
DNA Primers / genetics
Molecular Sequence Data
Nucleic Acid Conformation
RNA Splicing
RNA, Catalytic / chemistry,  genetics,  metabolism
RNA, Fungal / chemistry*,  genetics,  metabolism*
RNA, Small Nuclear / chemistry*,  genetics,  metabolism*
Saccharomyces cerevisiae / genetics,  growth & development,  metabolism
Spliceosomes / metabolism
Grant Support
15628//Canadian Institutes of Health Research
Reg. No./Substance:
0/DNA Primers; 0/RNA, Catalytic; 0/RNA, Fungal; 0/RNA, Small Nuclear

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