View source for 1k1g


==STRUCTURAL BASIS FOR RECOGNITION OF THE INTRON BRANCH SITE RNA BY SPLICING FACTOR 1==
<StructureSection load='1k1g' size='340' side='right'caption='[[1k1g]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1k1g]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K1G OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1K1G FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1k1g FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k1g OCA], [https://pdbe.org/1k1g PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1k1g RCSB], [https://www.ebi.ac.uk/pdbsum/1k1g PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1k1g ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SF01_HUMAN SF01_HUMAN] Necessary for the ATP-dependent first step of spliceosome assembly. Binds to the intron branch point sequence (BPS) 5'-UACUAAC-3' of the pre-mRNA. May act as transcription repressor.<ref>PMID:8752089</ref> <ref>PMID:10449420</ref> <ref>PMID:9660765</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/k1/1k1g_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1k1g ConSurf].
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== Publication Abstract from PubMed ==
During spliceosome assembly, splicing factor 1 (SF1) specifically recognizes the intron branch point sequence (BPS) UACUAAC in the pre-mRNA transcripts. We show that the KH-QUA2 region of SF1 defines an enlarged KH (hn RNP K) fold which is necessary and sufficient for BPS binding. The 3' part of the BPS (UAAC), including the conserved branch point adenosine (underlined), is specifically recognized in a hydrophobic cleft formed by the Gly-Pro-Arg-Gly motif and the variable loop of the KH domain. The QUA2 region recognizes the 5' nucleotides of the BPS (ACU). The branch point adenosine acting as the nucleophile in the first biochemical step of splicing is deeply buried. BPS RNA recognition suggests how SF1 may facilitate subsequent formation of the prespliceosomal complex A.

Structural basis for recognition of the intron branch site RNA by splicing factor 1.,Liu Z, Luyten I, Bottomley MJ, Messias AC, Houngninou-Molango S, Sprangers R, Zanier K, Kramer A, Sattler M Science. 2001 Nov 2;294(5544):1098-102. PMID:11691992<ref>PMID:11691992</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1k1g" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Bottomley MJ]]
[[Category: Houngninou-Molango S]]
[[Category: Kramer A]]
[[Category: Liu Z]]
[[Category: Luyten I]]
[[Category: Messias AC]]
[[Category: Sattler M]]
[[Category: Sprangers R]]
[[Category: Zanier K]]