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. 1989 Jul;9(7):2975–2982. doi: 10.1128/mcb.9.7.2975

The U1 RNA-binding site of the U1 small nuclear ribonucleoprotein (snRNP)-associated A protein suggests a similarity with U2 snRNPs.

C Lutz-Freyermuth 1, J D Keene 1, C Lutz-Reyermuth 1
PMCID: PMC362765  PMID: 2528681

Abstract

The site of interaction between human U1 RNA and one of its uniquely associated proteins, A, was examined with in vitro binding assays. The A protein bound directly to stem-loop II of U1 RNA in a region which exhibits sequence similarity to U2 RNA. The similarity with U2 RNA was in a region that has been shown to interact with a U2 RNA-associated protein. The A protein-binding site on U1 RNA overlapped a previously described epitope for an RNA-specific human autoantibody (S. L. Deutscher and J. D. Keene, Proc. Natl. Acad. Sci. USA 85:3299-3303, 1988), supporting the hypothesis that the anti-RNA antibody originated as an anti-idiotypic response to A protein-specific autoantibodies.

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Selected References

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