Linked Life Data

8849776

Source:http://linkedlifedata.com/resource/pubmed/id/8849776

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1996-11-27
pubmed:abstractText
We have introduced a single photochemical crosslinking reagent into specific sites in the central domain of U6 to identify the sites that are in close proximity to the pre-mRNA substrate. Four distinct U6 snRNAs were synthesized with a single 4-thiouridine (4-thioU) at positions 46, 51, 54, and 57, respectively. Synthetic U6 RNA containing the 4-thioU modifications can functionally reconstitute splicing activity in cell-free yeast splicing extracts depleted of endogenous U6 snRNA. Upon photoactivation with UV (>300 nm), 4-thioU at position 46 forms crosslinks to pre-mRNA near the 5' splice site at nt +4, +5, +6, and +7 in the intron, whereas 4-thioU at position 51 crosslinks to the pre-mRNA at positions -2, -1, +1, +2, +3, and at the invariant G in the lariat intermediate. All crosslinks are dependent on the presence of ATP and the splicing substrate. The two crosslinks to the pre-mRNA from position 46 and 51 of U6 can also occur in prp2 heat-inactivated yeast splicing extracts blocked immediately prior to the first chemical step. Significantly, the crosslink from position 51 can undergo subsequent splicing when the mutant extract is complemented with functional Prp2 protein in a chase experiment, indicating that the crosslink reflects a functional interaction that is maintained during the first step. The crosslink to lariat intermediate appears when the mutant spliceosomes are complemented with functional Prp2 protein added exogenously. This experiment is a paradigm for future studies in which different mutant extracts are used to establish the stage in assembly at which particular RNA-RNA interactions defined by unique crosslinks occur.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Actins, http://linkedlifedata.com/resource/pubmed/chemical/Affinity Labels, http://linkedlifedata.com/resource/pubmed/chemical/Cross-Linking Reagents, http://linkedlifedata.com/resource/pubmed/chemical/DEAD-box RNA Helicases, http://linkedlifedata.com/resource/pubmed/chemical/Fungal Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Guanosine, http://linkedlifedata.com/resource/pubmed/chemical/PRP2 protein, S cerevisiae, http://linkedlifedata.com/resource/pubmed/chemical/RNA, Fungal, http://linkedlifedata.com/resource/pubmed/chemical/RNA, Small Nuclear, http://linkedlifedata.com/resource/pubmed/chemical/RNA Precursors, http://linkedlifedata.com/resource/pubmed/chemical/Saccharomyces cerevisiae Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Thiouridine
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1355-8382
pubmed:author
pubmed:issnType
Print
pubmed:volume
2
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
995-1010
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Site-specific crosslinks of yeast U6 snRNA to the pre-mRNA near the 5' splice site.
pubmed:affiliation
Division of Biology, California Institute of Technology, Pasadena 91125, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.