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1two

From Proteopedia

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[[Image:1two.gif|left|200px]]
 
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{{Structure
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==NMR structure of the pheromone binding protein from Antheraea polyphemus at acidic pH==
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|PDB= 1two |SIZE=350|CAPTION= <scene name='initialview01'>1two</scene>
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<StructureSection load='1two' size='340' side='right'caption='[[1two]]' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1two]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Antheraea_polyphemus Antheraea polyphemus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TWO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1TWO FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
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|GENE=
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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=1two FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1two OCA], [https://pdbe.org/1two PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1two RCSB], [https://www.ebi.ac.uk/pdbsum/1two PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1two ProSAT]</span></td></tr>
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}}
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PBP_ANTPO PBP_ANTPO] This major soluble protein in olfactory sensilla of male moths might serve to solubilize the extremely hydrophobic pheromone molecules and to transport pheromone through the aqueous lymph to receptors located on olfactory cilia.
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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/tw/1two_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=1two ConSurf].
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<div style="clear:both"></div>
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'''NMR structure of the pheromone binding protein from Antheraea polyphemus at acidic pH'''
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==See Also==
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*[[Pheromone binding protein|Pheromone binding protein]]
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__TOC__
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==Overview==
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</StructureSection>
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Olfaction in moths is one of the most impressive examples of chemical communication found in nature for its exquisite sensitivity and selectivity. Pheromone-binding proteins (PBPs), present in the antennae of male moth and other insect species, bind the hydrophobic pheromone molecules and transport them to the G protein-coupled olfactory receptor proteins. The targeted delivery of these non-polar ligands to membrane-bound receptors involves ligand release on or near the target cell membranes, the molecular details of which are still not well understood. The PBP from the giant silk moth Antheraea polyphemus (ApolPBP) binds acetate pheromone only at pH above 6.0, and its structure at pH 6.3 has been determined previously. Here we report the solution NMR structure of ApolPBP at the acidic pH 5.2. Comparison of the present structure to that at neutral pH reveals the details of the pH-induced conformational changes and provides mechanistic clues for ligand release at acidic pH. The ApolPBP pH-induced structural change is quite different from that observed for alcohol binding Bombyx mori PBP (BmorPBP), where the C-terminal segment folds into a helix and occupies the ligand binding cavity. We observe a reorientation of helices alpha1, alpha3, and alpha4 at acidic pH caused by protonation of His69, His70 and His95 in the interior. This provides the driving force behind the opening of the ligand binding cavity and the release of the pheromone molecule from its carrier protein near the membrane.
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==About this Structure==
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1TWO is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Antheraea_polyphemus Antheraea polyphemus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TWO OCA].
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==Reference==
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Structural consequences of the pH-induced conformational switch in A.polyphemus pheromone-binding protein: mechanisms of ligand release., Zubkov S, Gronenborn AM, Byeon IJ, Mohanty S, J Mol Biol. 2005 Dec 16;354(5):1081-90. Epub 2005 Oct 27. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16289114 16289114]
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[[Category: Antheraea polyphemus]]
[[Category: Antheraea polyphemus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Mohanty, S.]]
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[[Category: Mohanty S]]
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[[Category: Zubkov, S.]]
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[[Category: Zubkov S]]
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[[Category: apolpbp]]
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[[Category: conformational switch]]
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[[Category: conformational transition]]
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[[Category: pbp]]
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[[Category: pheromone binding protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 14:24:13 2008''
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Current revision

NMR structure of the pheromone binding protein from Antheraea polyphemus at acidic pH

PDB ID 1two

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