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==Solution Structure of a Circular-Permuted Variant of the Potent HIV-inactivating Protein Cyanovirin-N==
==Solution Structure of a Circular-Permuted Variant of the Potent HIV-inactivating Protein Cyanovirin-N==
<StructureSection load='1n02' size='340' side='right'caption='[[1n02]], [[NMR_Ensembles_of_Models | 26 NMR models]]' scene=''>
<StructureSection load='1n02' size='340' side='right'caption='[[1n02]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1n02]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Anabaena_variabilis_var._ellipsospora Anabaena variabilis var. ellipsospora]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1N02 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1N02 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1n02]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Nostoc_ellipsosporum Nostoc ellipsosporum]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1N02 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1N02 FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2ezm|2ezm]]</div></td></tr>
</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=1n02 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1n02 OCA], [https://pdbe.org/1n02 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1n02 RCSB], [https://www.ebi.ac.uk/pdbsum/1n02 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1n02 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=1n02 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1n02 OCA], [https://pdbe.org/1n02 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1n02 RCSB], [https://www.ebi.ac.uk/pdbsum/1n02 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1n02 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/CVN_NOSEL CVN_NOSEL]] Mannose-binding lectin.<ref>PMID:9210678</ref> <ref>PMID:12678493</ref>
[https://www.uniprot.org/uniprot/CVN_NOSEL CVN_NOSEL] Mannose-binding lectin.<ref>PMID:9210678</ref> <ref>PMID:12678493</ref>  
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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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=1n02 ConSurf].
</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=1n02 ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The high-resolution solution structure of a monomeric circular permuted (cp) variant of the potent HIV-inactivating protein cyanovirin-N (CV-N) was determined by NMR. Comparison with the wild-type (wt) structure revealed that the observed loss in stability of cpCV-N compared to the wt protein is due to less favorable packing of several residues at the pseudo twofold axis that are responsible for holding the two halves of the molecule together. In particular, the N and C-terminal amino acid residues exhibit conformational flexibility, resulting in fewer and less favorable contacts between them. The important hydrophobic and hydrogen-bonding network between residues W49, D89, H90, Y100 and E101 that was observed in wt CV-N is no longer present. For instance, Y100 and E101 are flexible and the tryptophan side-chain is in a different conformation compared to the wt protein. The stability loss amounts to approximately 2kcal/mol and the mobility of the protein is evident by fast amide proton exchange throughout the chain. Mutation of the single proline residue to glycine (P52G) did not substantially affect the stability of the protein, in contrast to the finding for wtCV-N. The binding of high-mannose type oligosaccharides to cpCV-N was also investigated. Similar to wtCV-N, two carbohydrate-binding sites were identified on the protein and the Man alpha1--&gt;2Man linked moieties on the sugar were delineated as binding epitopes. Unlike in wtCV-N, the binding sites on cpCV-N are structurally similar and exhibit comparable binding affinities for the respective sugars. On the basis of the studies presented here and previous results on high-mannose binding to wtCV-N, we discuss a model for the interaction between gp120 and CV-N.
Solution structure of a circular-permuted variant of the potent HIV-inactivating protein cyanovirin-N: structural basis for protein stability and oligosaccharide interaction.,Barrientos LG, Louis JM, Ratner DM, Seeberger PH, Gronenborn AM J Mol Biol. 2003 Jan 3;325(1):211-23. PMID:12473463<ref>PMID:12473463</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1n02" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Anabaena variabilis var. ellipsospora]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Barrientos, L G]]
[[Category: Nostoc ellipsosporum]]
[[Category: Gronenborn, A M]]
[[Category: Barrientos LG]]
[[Category: Viral protein inhibitor]]
[[Category: Gronenborn AM]]
[[Category: Virus/viral protein inhibitor]]

Revision as of 08:44, 10 April 2024

Solution Structure of a Circular-Permuted Variant of the Potent HIV-inactivating Protein Cyanovirin-N

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