1up1

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(New page: 200px<br /> <applet load="1up1" size="450" color="white" frame="true" align="right" spinBox="true" caption="1up1, resolution 1.9&Aring;" /> '''UP1, THE TWO RNA-REC...)
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[[Image:1up1.gif|left|200px]]<br />
 
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<applet load="1up1" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1up1, resolution 1.9&Aring;" />
 
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'''UP1, THE TWO RNA-RECOGNITION MOTIF DOMAIN OF HNRNP A1'''<br />
 
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==Overview==
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==UP1, THE TWO RNA-RECOGNITION MOTIF DOMAIN OF HNRNP A1==
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BACKGROUND: Heterogeneous nuclear ribonucleoprotein (hnRNP) A1 is one of, the most abundant core proteins of hnRNP complexes in metazoan nuclei. It, behaves as a global regulator of alternative pre-mRNA splicing by, antagonizing the activities of several serine/arginine-rich splicing, factors (SR proteins), resulting in the activation of distal alternative, 5' splice sites and skipping of optional exons. Purified hnRNP A1 has, nucleic acid annealing activity. The protein also shuttles continuously, between the nucleus and the cytoplasm, a process mediated by signals, within its C-terminal glycine-rich domain. The N-terminal region of human, hnRNP A1, termed unwinding protein 1 (UP1), contains two RNA-recognition, motifs (RRMs), RRM1 and RRM2. Understanding the structural elements by, which hnRNP A1 interacts with RNA will have broad implications for studies, of RNA processing. RESULTS: The crystal structure of UP1 has been, determined to 1.9 A resolution. Each RRM independently adopts the, characteristic RRM fold, consisting of a four-stranded antiparallel, beta-pleated sheet and two alpha helices packed on one side of the beta, sheet. The two RRMs are antiparallel and held in close contact, mainly by, two Arg-Asp ion pairs. As a result, the two four-stranded beta sheets are, brought together to form an extended RNA-binding surface. A segment of the, linker connecting the two RRMs is flexible in the absence of bound RNA, but the general location of the linker suggests that it can make direct, contacts with RNA. Comparison with other RRM structures indicates that a, short 310 helix, found immediately N-terminal to the first beta strand in, RRM1, may interact with RNA directly. CONCLUSIONS: The RRM is one of the, most common and best characterized RNA-binding motifs. In certain cases, one RRM is sufficient for sequence-specific and high affinity RNA binding;, but in other cases, synergy between several RRMs within a single protein, is required. This study shows how two RRMs are organized in a single, polypeptide. The two independently folded RRMs in UP1 are held together in, a fixed geometry, enabling the two RRMs to function as a single entity in, binding RNA, and so explaining the synergy between the RRMs. The UP1, structure also suggests that residues which lie outside of the RRMs can, make potentially important interactions with RNA.
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<StructureSection load='1up1' size='340' side='right'caption='[[1up1]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1up1]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UP1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1UP1 FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1up1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1up1 OCA], [https://pdbe.org/1up1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1up1 RCSB], [https://www.ebi.ac.uk/pdbsum/1up1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1up1 ProSAT]</span></td></tr>
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</table>
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== Disease ==
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[https://www.uniprot.org/uniprot/ROA1_HUMAN ROA1_HUMAN] Amyotrophic lateral sclerosis;Inclusion body myopathy with Paget disease of bone and frontotemporal dementia. The disease is caused by mutations affecting the gene represented in this entry.<ref>PMID:23455423</ref> The disease is caused by mutations affecting the gene represented in this entry.<ref>PMID:23455423</ref>
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== Function ==
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[https://www.uniprot.org/uniprot/ROA1_HUMAN ROA1_HUMAN] Involved in the packaging of pre-mRNA into hnRNP particles, transport of poly(A) mRNA from the nucleus to the cytoplasm and may modulate splice site selection. May play a role in HCV RNA replication.<ref>PMID:17229681</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/up/1up1_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1up1 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1UP1 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1UP1 OCA].
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*[[Nucleoprotein 3D structures|Nucleoprotein 3D structures]]
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== References ==
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==Reference==
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<references/>
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Crystal structure of human UP1, the domain of hnRNP A1 that contains two RNA-recognition motifs., Xu RM, Jokhan L, Cheng X, Mayeda A, Krainer AR, Structure. 1997 Apr 15;5(4):559-70. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9115444 9115444]
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Cheng, X.]]
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[[Category: Cheng X]]
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[[Category: Jokhan, L.]]
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[[Category: Jokhan L]]
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[[Category: Krainer, A.R.]]
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[[Category: Krainer AR]]
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[[Category: Mayeda, A.]]
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[[Category: Mayeda A]]
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[[Category: Xu, R.M.]]
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[[Category: Xu R-M]]
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[[Category: nuclear proteinhnrnp a1]]
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[[Category: rna-binding]]
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[[Category: rna-recognition motif]]
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[[Category: up1]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 12 19:37:18 2007''
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Current revision

UP1, THE TWO RNA-RECOGNITION MOTIF DOMAIN OF HNRNP A1

PDB ID 1up1

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