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3k3q

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{{Seed}}
 
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[[Image:3k3q.jpg|left|200px]]
 
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==Crystal Structure of a Llama Antibody complexed with the C. Botulinum Neurotoxin Serotype A Catalytic Domain==
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The line below this paragraph, containing "STRUCTURE_3k3q", creates the "Structure Box" on the page.
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<StructureSection load='3k3q' size='340' side='right' caption='[[3k3q]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[3k3q]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Clobh Clobh] and [http://en.wikipedia.org/wiki/Camelus_glama Camelus glama]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3K3Q OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3K3Q FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">llama VHH immunoglobulin ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9844 Camelus glama]), botA, CBO0806, CLC_0862, neurotoxin catalytic domain ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=441771 CLOBH])</td></tr>
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{{STRUCTURE_3k3q| PDB=3k3q | SCENE= }}
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Bontoxilysin Bontoxilysin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.24.69 3.4.24.69] </span></td></tr>
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<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=3k3q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3k3q OCA], [http://pdbe.org/3k3q PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3k3q RCSB], [http://www.ebi.ac.uk/pdbsum/3k3q PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3k3q ProSAT]</span></td></tr>
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</table>
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== Function ==
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[[http://www.uniprot.org/uniprot/BXA1_CLOBH BXA1_CLOBH]] Inhibits acetylcholine release. The botulinum toxin binds with high affinity to peripheral neuronal presynaptic membrane to the secretory vesicle protein SV2. It binds directly to the largest luminal loop of SV2A, SV2B and SV2C. It is then internalized by receptor-mediated endocytosis. The C-terminus of the heavy chain (H) is responsible for the adherence of the toxin to the cell surface while the N-terminus mediates transport of the light chain from the endocytic vesicle to the cytosol. After translocation, the light chain (L) hydrolyzes the 197-Gln-|-Arg-198 bond in SNAP-25, thereby blocking neurotransmitter release. Inhibition of acetylcholine release results in flaccid paralysis, with frequent heart or respiratory failure.
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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/k3/3k3q_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=3k3q ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Ingestion or inhalation of botulinum neurotoxin (BoNT) results in botulism, a severe and frequently fatal disease. Current treatments rely on antitoxins, which, while effective, cannot reverse symptoms once BoNT has entered the neuron. For treatments that can reverse intoxication, interest has focused on developing inhibitors of the enzymatic BoNT light chain (BoNT Lc). Such inhibitors typically mimic substrate and bind in or around the substrate cleavage pocket. To explore the full range of binding sites for serotype A light chain (BoNT/A Lc) inhibitors, we created a library of non-immune llama single-domain VHH (camelid heavy-chain variable region derived from heavy-chain-only antibody) antibodies displayed on the surface of the yeast Saccharomyces cerevisiae. Library selection on BoNT/A Lc yielded 15 yeast-displayed VHH with equilibrium dissociation constants (K(d)) from 230 to 0.03 nM measured by flow cytometry. Eight of 15 VHH inhibited the cleavage of substrate SNAP25 (synaptosome-associated protein of 25,000 Da) by BoNT/A Lc. The most potent VHH (Aa1) had a solution K(d) for BoNT/A Lc of 1.47 x 10(-)(10) M and an IC(50) (50% inhibitory concentration) of 4.7 x 10(-)(10) M and was resistant to heat denaturation and reducing conditions. To understand the mechanism by which Aa1 inhibited catalysis, we solved the X-ray crystal structure of the BoNT/A Lc-Aa1 VHH complex at 2.6 A resolution. The structure reveals that the Aa1 VHH binds in the alpha-exosite of the BoNT/A Lc, far from the active site for catalysis. The study validates the utility of non-immune llama VHH libraries as a source of enzyme inhibitors and identifies the BoNT/A Lc alpha-exosite as a target for inhibitor development.
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===Crystal Structure of a Llama Antibody complexed with the C. Botulinum Neurotoxin Serotype A Catalytic Domain===
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A single-domain llama antibody potently inhibits the enzymatic activity of botulinum neurotoxin by binding to the non-catalytic alpha-exosite binding region.,Dong J, Thompson AA, Fan Y, Lou J, Conrad F, Ho M, Pires-Alves M, Wilson BA, Stevens RC, Marks JD J Mol Biol. 2010 Apr 9;397(4):1106-18. Epub 2010 Feb 6. PMID:20138889<ref>PMID:20138889</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 3k3q" style="background-color:#fffaf0;"></div>
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==See Also==
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The line below this paragraph, {{ABSTRACT_PUBMED_20138889}}, adds the Publication Abstract to the page
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*[[Botulinum neurotoxin|Botulinum neurotoxin]]
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(as it appears on PubMed at http://www.pubmed.gov), where 20138889 is the PubMed ID number.
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*[[Llama Antibody Inhibits Botulinum Neruotoxin|Llama Antibody Inhibits Botulinum Neruotoxin]]
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== References ==
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{{ABSTRACT_PUBMED_20138889}}
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<references/>
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__TOC__
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==About this Structure==
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</StructureSection>
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3K3Q is a 3 chains structure with sequences from [http://en.wikipedia.org/wiki/Clostridium_botulinum_a_str._hall Clostridium botulinum a str. hall] and [http://en.wikipedia.org/wiki/Lama_glama Lama glama]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3K3Q OCA].
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==Reference==
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<ref group="xtra">PMID:20138889</ref><references group="xtra"/>
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[[Category: Bontoxilysin]]
[[Category: Bontoxilysin]]
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[[Category: Clostridium botulinum a str. hall]]
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[[Category: Camelus glama]]
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[[Category: Lama glama]]
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[[Category: Clobh]]
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[[Category: Dong, J.]]
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[[Category: Dong, J]]
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[[Category: Marks, J D.]]
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[[Category: Marks, J D]]
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[[Category: Stevens, R C.]]
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[[Category: Stevens, R C]]
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[[Category: Thompson, A A.]]
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[[Category: Thompson, A A]]
[[Category: Antibody]]
[[Category: Antibody]]
[[Category: Bont]]
[[Category: Bont]]
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[[Category: Vhh]]
[[Category: Vhh]]
[[Category: Zinc]]
[[Category: Zinc]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 25 13:30:43 2010''
 

Current revision

Crystal Structure of a Llama Antibody complexed with the C. Botulinum Neurotoxin Serotype A Catalytic Domain

3k3q, resolution 2.60Å

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