1a9n

<table><tr><td colspan='2'>[[1a9n]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/ ] and [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1A9N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1A9N FirstGlance]. <br>

</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1a9n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1a9n OCA], [https://pdbe.org/1a9n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1a9n RCSB], [https://www.ebi.ac.uk/pdbsum/1a9n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1a9n ProSAT]</span></td></tr>

[[https://www.uniprot.org/uniprot/RU2B_HUMAN RU2B_HUMAN]] Involved in pre-mRNA splicing. This protein is associated with snRNP U2. It binds stem loop IV of U2 snRNA only in presence of the U2A' protein. [[https://www.uniprot.org/uniprot/RU2A_HUMAN RU2A_HUMAN]] This protein is associated with sn-RNP U2. It helps the A' protein to bind stem loop IV of U2 snRNA.

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== Publication Abstract from PubMed ==

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.

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<ref>PMID:9716128</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Human]]

[[Category: Evans, P R]]

[[Category: Nagai, K]]

[[Category: Price, S R]]

[[Category: Snrnp]]