1a9n
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CRYSTAL STRUCTURE OF THE SPLICEOSOMAL U2B-U2A' PROTEIN COMPLEX BOUND TO A FRAGMENT OF U2 SMALL NUCLEAR RNA
OverviewOverview
We have determined the crystal structure at 2.4 A resolution of a ternary, complex between the spliceosomal U2B"/U2A' protein complex and, hairpin-loop IV of U2 small nuclear RNA. Unlike its close homologue the, U1A protein, U2B" binds to its cognate RNA only in the presence of U2A', which contains leucine-rich repeats in its sequence. The concave surface, of a parallel beta-sheet within the leucine-rich-repeat region of U2A', interacts with the ribonucleoprotein domain of U2B" on the surface, opposite its RNA-binding surface. The basic carboxy-terminal region of, U2A' interacts with the RNA stem. The crystal structure reveals how, protein-protein interaction regulates RNA-binding specificity, and how, replacing only a few key residues allows the U2B" and U1A proteins to, discriminate between their cognate RNA hairpins by forming alternative, networks of interactions.
About this StructureAbout this Structure
1A9N is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of the spliceosomal U2B"-U2A' protein complex bound to a fragment of U2 small nuclear RNA., Price SR, Evans PR, Nagai K, Nature. 1998 Aug 13;394(6694):645-50. PMID:9716128
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