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. 2002 Apr;8(4):426-39.
doi: 10.1017/s1355838202021088.

Purification and characterization of native spliceosomes suitable for three-dimensional structural analysis

Melissa S Jurica  1 , Lawrence J Licklider, Steven R Gygi, Nikolaus Grigorieff, Melissa J Moore
Affiliations

Purification and characterization of native spliceosomes suitable for three-dimensional structural analysis

Melissa S Jurica et al. RNA. 2002 Apr.

Abstract

We describe characterization of spliceosomes affinity purified under native conditions. These spliceosomes consist largely of C complex containing splicing intermediates. After C complex assembly on an MS2 affinity-tagged pre-mRNA substrate containing a 3' splice site mutation, followed by RNase H digestion of earlier complexes, spliceosomes were purified by size exclusion and affinity selection. This protocol yielded 40S C complexes in sufficient quantities to visualize in negative stain by electron microscopy. Complexes purified in this way contain U2, U5, and U6 snRNAs, but very little U1 or U4 snRNA. Analysis by tandem mass spectrometry confirmed the presence of core snRNP proteins (SM and LSM), U2 and U5 snRNP-specific proteins, and the second step factors Prp16, Prp17, Slu7, and Prp22. In contrast, proteins specific to earlier splicing complexes, such as U2AF and U1 snRNP components, were not detected in C complex, but were present in similarly purified H complex. Images of these spliceosomes revealed single particles with dimensions of approximately 270 x 240 A that assort into well-defined classes. These images represent an important first step toward attaining a comprehensive three-dimensional understanding of pre-mRNA splicing.

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References

    1. Proc Natl Acad Sci U S A. 1997 Oct 28;94(22):11798-802 - PubMed
    1. Mol Cell Biol. 1993 Mar;13(3):1876-82 - PubMed
    1. Mol Cell Biol. 1998 Apr;18(4):2055-66 - PubMed
    1. EMBO J. 1998 Apr 1;17(7):2095-106 - PubMed
    1. Genes Dev. 1998 Apr 1;12(7):996-1009 - PubMed

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