NDLI: The association of the U1-specific 70K and C proteins with U1 snRNPs is mediated in part by common U snRNP proteins.

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The association of the U1-specific 70K and C proteins with U1 snRNPs is mediated in part by common U snRNP proteins.

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The association of the U1-specific 70K and C proteins with U1 snRNPs is mediated in part by common U snRNP proteins.

Content Provider	PubMed Central
Author	Nelissen, R. L. Will, C. L. Van, Venrooij W. J. Lührmann, R.
Abstract	The U1 small nuclear ribonucleoprotein particle (snRNP)-specific 70K and A proteins are known to bind directly to stem-loops of the U1 snRNA, whereas the U1-C protein does not bind to naked U1 snRNA, but depends on other U1 snRNP protein components for its association. Focusing on the U1-70K and U1-C proteins, protein-protein interactions contributing to the association of these particle-specific proteins with the U1 snRNP were studied. Immunoprecipitation of complexes formed after incubation of naked U1 snRNA or purified U1 snRNPs lacking their specific proteins (core U1 snRNP) with in vitro translated U1-C protein, revealed that both common snRNP proteins and the U1-70K protein are required for the association of U1-C with the U1 snRNP. Binding studies with various in vitro translated U1-70K mutants demonstrated that the U1-70K N-terminal domain is necessary and sufficient for the interaction of U1-C with core U1 snRNPs. Surprisingly, several N-terminal fragments of the U1-70K protein, which lacked the U1-70K RNP-80 motif and did not bind naked U1 RNA, associated stably with core U1 snRNPs. This suggests that a new U1-70K binding site is generated upon association of common U1 snRNP proteins with U1 RNA. The interaction between the N-terminal domain of U1-70K and the core RNP domain was specific for the U1 snRNP; stable binding was not observed with core U2 or U5 snRNPs, suggesting essential structural differences among snRNP core domains. Evidence for direct protein-protein interactions between U1-specific proteins and common snRNP proteins was supported by chemical crosslinking experiments using purified U1 snRNPs. Individual crosslinks between the U1-70K and the common D2 or B'/B protein, as well as between U1-C and B'/B, were detected. A model for the assembly of U1 snRNP is presented in which the complex of common proteins on the RNA backbone functions as a platform for the association of the U1-specific proteins.
Starting Page	4113
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	17
Volume Number	13
Language	English
Publisher Date	1994-09-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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