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| | ==Crystal Structure of the Hepatitis Delta Virus Gemonic Ribozyme Precursor, with C75U mutaion, in EDTA solution== | | ==Crystal Structure of the Hepatitis Delta Virus Gemonic Ribozyme Precursor, with C75U mutaion, in EDTA solution== |
| - | <StructureSection load='1vbx' size='340' side='right' caption='[[1vbx]], [[Resolution|resolution]] 2.70Å' scene=''> | + | <StructureSection load='1vbx' size='340' side='right'caption='[[1vbx]], [[Resolution|resolution]] 2.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1vbx]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VBX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1VBX FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1vbx]] is a 2 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=1VBX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1VBX FirstGlance]. <br> |
| - | </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1drz|1drz]], [[1cx0|1cx0]], [[1vby|1vby]], [[1vbz|1vbz]], [[1vc0|1vc0]], [[1sjf|1sjf]], [[1vc5|1vc5]], [[1vc6|1vc6]], [[1vc7|1vc7]]</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7Å</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1vbx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vbx OCA], [http://pdbe.org/1vbx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1vbx RCSB], [http://www.ebi.ac.uk/pdbsum/1vbx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1vbx ProSAT]</span></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=1vbx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vbx OCA], [https://pdbe.org/1vbx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1vbx RCSB], [https://www.ebi.ac.uk/pdbsum/1vbx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1vbx ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SNRPA_HUMAN SNRPA_HUMAN]] Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro.<ref>PMID:9848648</ref> | + | [https://www.uniprot.org/uniprot/SNRPA_HUMAN SNRPA_HUMAN] Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro.<ref>PMID:9848648</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | ==See Also== | | ==See Also== |
| - | *[[Nucleoprotein|Nucleoprotein]] | + | *[[Nucleoprotein 3D structures|Nucleoprotein 3D structures]] |
| - | *[[Ribozyme|Ribozyme]] | + | *[[Ribozyme 3D structures|Ribozyme 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Cate, J H.D]] | + | [[Category: Large Structures]] |
| - | [[Category: Ding, F]] | + | [[Category: Cate JHD]] |
| - | [[Category: Doudna, J A]] | + | [[Category: Ding F]] |
| - | [[Category: Ke, A]] | + | [[Category: Doudna JA]] |
| - | [[Category: Zhou, K]] | + | [[Category: Ke A]] |
| - | [[Category: Hdv]]
| + | [[Category: Zhou K]] |
| - | [[Category: Precursor]]
| + | |
| - | [[Category: Ribozyme]]
| + | |
| - | [[Category: Rna]]
| + | |
| - | [[Category: Translation-rna complex]]
| + | |
| - | [[Category: U1a]]
| + | |
| Structural highlights
Function
SNRPA_HUMAN Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro.[1]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Ribozymes enhance chemical reaction rates using many of the same catalytic strategies as protein enzymes. In the hepatitis delta virus (HDV) ribozyme, site-specific self-cleavage of the viral RNA phosphodiester backbone requires both divalent cations and a cytidine nucleotide. General acid-base catalysis, substrate destabilization and global and local conformational changes have all been proposed to contribute to the ribozyme catalytic mechanism. Here we report ten crystal structures of the HDV ribozyme in its pre-cleaved state, showing that cytidine is positioned to activate the 2'-OH nucleophile in the precursor structure. This observation supports its proposed role as a general base in the reaction mechanism. Comparison of crystal structures of the ribozyme in the pre- and post-cleavage states reveals a significant conformational change in the RNA after cleavage and that a catalytically critical divalent metal ion from the active site is ejected. The HDV ribozyme has remarkable chemical similarity to protein ribonucleases and to zymogens for which conformational dynamics are integral to biological activity. This finding implies that RNA structural rearrangements control the reactivity of ribozymes and ribonucleoprotein enzymes.
A conformational switch controls hepatitis delta virus ribozyme catalysis.,Ke A, Zhou K, Ding F, Cate JH, Doudna JA Nature. 2004 May 13;429(6988):201-5. PMID:15141216[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Lutz CS, Cooke C, O'Connor JP, Kobayashi R, Alwine JC. The snRNP-free U1A (SF-A) complex(es): identification of the largest subunit as PSF, the polypyrimidine-tract binding protein-associated splicing factor. RNA. 1998 Dec;4(12):1493-9. PMID:9848648
- ↑ Ke A, Zhou K, Ding F, Cate JH, Doudna JA. A conformational switch controls hepatitis delta virus ribozyme catalysis. Nature. 2004 May 13;429(6988):201-5. PMID:15141216 doi:http://dx.doi.org/10.1038/nature02522
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