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2pys

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Revision as of 08:57, 10 September 2015

Crystal Structure of a Five Site Mutated Cyanovirin-N with a Mannose Dimer Bound at 1.8 A Resolution

Structural highlights

2pys is a 2 chain structure with sequence from Anabaena variabilis var. ellipsospora. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1lom, 1m5m, 2ezm, 1iiy, 1l5e, 3ezm
Gene:	CYANOVIRN-N (Anabaena variabilis var. ellipsospora)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[CVN_NOSEL] Mannose-binding lectin.^[1] ^[2]

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

Cyanovirin-N (CV-N) is a 101 amino acid cyanobacterial lectin with potent antiviral activity against HIV, mediated by high-affinity binding to branched N-linked oligomannosides on the viral surface envelope protein gp120. The protein contains two carbohydrate-binding domains, A and B, each of which binds short oligomannosides independently in vitro. The interaction to gp120 could involve either a single domain or both domains simultaneously; it is not clear which mode would elicit the antiviral activity. The model is complicated by the formation of a domain-swapped dimer form, in which part of each domain is exchanged between two monomers, which contains four functional carbohydrate-binding domains. To clarify whether multivalent interactions with gp120 are necessary for the antiviral activity, we engineered a novel mutant, P51G-m4-CVN, in which the binding site on domain A has been knocked out; in addition, a [P51G] mutation prevents the formation of domain-swapped dimers under physiological conditions. Here, we present the crystal structures at 1.8 A of the free and of the dimannose-bound forms of P51G-m4-CVN, revealing a monomeric structure in which only domain B is bound to dimannose. P51G-m4-CVN binds gp120 with an affinity almost 2 orders of magnitude lower than wt CV-N and is completely inactive against HIV. The tight binding to gp120 is recovered in the domain-swapped version of P51G-m4-CVN, prepared under extreme conditions. Our findings show that the presence of at least two oligomannoside-binding sites, either by the presence of intact domains A and B or by formation of domain-swapped dimers, is essential for activity.

A monovalent mutant of cyanovirin-N provides insight into the role of multiple interactions with gp120 for antiviral activity.,Fromme R, Katiliene Z, Giomarelli B, Bogani F, Mc Mahon J, Mori T, Fromme P, Ghirlanda G Biochemistry. 2007 Aug 14;46(32):9199-207. Epub 2007 Jul 18. PMID:17636873^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Boyd MR, Gustafson KR, McMahon JB, Shoemaker RH, O'Keefe BR, Mori T, Gulakowski RJ, Wu L, Rivera MI, Laurencot CM, Currens MJ, Cardellina JH 2nd, Buckheit RW Jr, Nara PL, Pannell LK, Sowder RC 2nd, Henderson LE. Discovery of cyanovirin-N, a novel human immunodeficiency virus-inactivating protein that binds viral surface envelope glycoprotein gp120: potential applications to microbicide development. Antimicrob Agents Chemother. 1997 Jul;41(7):1521-30. PMID:9210678
↑ Botos I, Wlodawer A. Cyanovirin-N: a sugar-binding antiviral protein with a new twist. Cell Mol Life Sci. 2003 Feb;60(2):277-87. PMID:12678493
↑ Fromme R, Katiliene Z, Giomarelli B, Bogani F, Mc Mahon J, Mori T, Fromme P, Ghirlanda G. A monovalent mutant of cyanovirin-N provides insight into the role of multiple interactions with gp120 for antiviral activity. Biochemistry. 2007 Aug 14;46(32):9199-207. Epub 2007 Jul 18. PMID:17636873 doi:10.1021/bi700666m

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2pys"

@@ Line 2: / Line 2: @@
 <StructureSection load='2pys' size='340' side='right' caption='[[2pys]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2pys]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Nostoc_ellipsosporum Nostoc ellipsosporum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PYS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2PYS FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2pys]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Anabaena_variabilis_var._ellipsospora Anabaena variabilis var. ellipsospora]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PYS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2PYS FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1lom|1lom]], [[1m5m|1m5m]], [[2ezm|2ezm]], [[1iiy|1iiy]], [[1l5e|1l5e]], [[3ezm|3ezm]]</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CYANOVIRN-N ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=45916 Nostoc ellipsosporum])</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CYANOVIRN-N ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=45916 Anabaena variabilis var. ellipsospora])</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=2pys FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pys OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2pys RCSB], [http://www.ebi.ac.uk/pdbsum/2pys PDBsum]</span></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=2pys FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pys OCA], [http://pdbe.org/2pys PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2pys RCSB], [http://www.ebi.ac.uk/pdbsum/2pys PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 28: / Line 28: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2pys" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>
 __TOC__
 </StructureSection>
-[[Category: Nostoc ellipsosporum]]
+[[Category: Anabaena variabilis var. ellipsospora]]
 [[Category: Fromme, P]]
 [[Category: Fromme, R]]

2pys

From Proteopedia

Revision as of 08:57, 10 September 2015

Crystal Structure of a Five Site Mutated Cyanovirin-N with a Mannose Dimer Bound at 1.8 A Resolution

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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