Publication Date:
1996-11-08
Description:
A minor class of metazoan introns has well-conserved splice sites with 5'-AU-AC-3' boundaries, compared to the 5'-GU-AG-3' boundaries and degenerate splice sites of conventional introns. Splicing of the AT-AC intron 2 of a sodium channel (SCN4A) precursor messenger RNA in vitro did not require inhibition of conventional splicing and required adenosine triphosphate, magnesium, and U12 small nuclear RNA (snRNA). When exon 3 was followed by the 5' splice site from the downstream conventional intron, splicing of intron 2 was greatly stimulated. This effect was U1 snRNA-dependent, unlike the basal AT-AC splicing reaction. Therefore, U1-mediated exon definition interactions can coordinate the activities of major and minor spliceosomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, Q -- Krainer, A R -- GM42699/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Nov 8;274(5289):1005-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cold Spring Harbor Laboratory, Post Office Box 100, Cold Spring Harbor, NY 11724-2208, USA. krainer@cshl.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8875927" target="_blank"〉PubMed〈/a〉
Keywords:
Adenosine Triphosphate/pharmacology
;
Animals
;
*Exons
;
HeLa Cells
;
Humans
;
*Introns
;
Magnesium/pharmacology
;
*RNA Splicing
;
RNA, Small Nuclear/*metabolism
;
Ribonucleoprotein, U1 Small Nuclear/metabolism
;
Ribonucleoproteins, Small Nuclear/metabolism
;
Sodium Channels/*genetics
;
Spliceosomes/genetics
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
