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Organization of core spliceosomal components U5 snRNA loop I and U4/U6 Di-snRNP within U4/U6.U5 Tri-snRNP as revealed by electron cryomicroscopy.

Abstract：

:In eukaryotes, pre-mRNA exons are interrupted by large noncoding introns. Alternative selection of exons and nucleotide-exact removal of introns are performed by the spliceosome, a highly dynamic macromolecular machine. U4/U6.U5 tri-snRNP is the largest and most conserved building block of the spliceosome. By 3D electron cryomicroscopy and labeling, the exon-aligning U5 snRNA loop I is localized at the center of the tetrahedrally shaped tri-snRNP reconstructed to approximately 2.1 nm resolution in vitrified ice. Independent 3D reconstructions of its subunits, U4/U6 and U5 snRNPs, show how U4/U6 and U5 combine to form tri-snRNP and, together with labeling experiments, indicate a close proximity of the spliceosomal core components U5 snRNA loop I and U4/U6 at the center of tri-snRNP. We suggest that this central tri-snRNP region may be the site to which the prespliceosomal U2 snRNA has to approach closely during formation of the catalytic core of the spliceosome.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Sander B,Golas MM,Makarov EM,Brahms H,Kastner B,Lührmann R,Stark H

doi

10.1016/j.molcel.2006.08.021

subject

Has Abstract

pub_date

2006-10-20 00:00:00

pages

267-78

issue

2

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(06)00603-4

journal_volume

24

pub_type

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