1eqd

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[[Image:1eqd.gif|left|200px]]
 
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==CRYSTAL STRUCTURE OF NITROPHORIN 4 COMPLEXED WITH CN==
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The line below this paragraph, containing "STRUCTURE_1eqd", creates the "Structure Box" on the page.
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<StructureSection load='1eqd' size='340' side='right'caption='[[1eqd]], [[Resolution|resolution]] 1.60&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'>[[1eqd]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rhodnius_prolixus Rhodnius prolixus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EQD FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.6&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene>, <scene name='pdbligand=CYN:CYANIDE+ION'>CYN</scene></td></tr>
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{{STRUCTURE_1eqd| PDB=1eqd | SCENE= }}
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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=1eqd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eqd OCA], [https://pdbe.org/1eqd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1eqd RCSB], [https://www.ebi.ac.uk/pdbsum/1eqd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1eqd ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/NP4_RHOPR NP4_RHOPR] Heme-based protein that deliver nitric oxide gas (NO) to the victim while feeding, resulting in vasodilation and inhibition of platelet aggregation. Also bind tightly to histamine, which is released by the host to induce wound healing (By similarity).
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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/eq/1eqd_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1eqd 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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The nitrophorins comprise an unusual family of proteins that use ferric (Fe(III)) heme to transport highly reactive nitric oxide (NO) from the salivary gland of a blood sucking bug to the victim, resulting in vasodilation and reduced blood coagulation. We have determined structures of nitrophorin 4 in complexes with H2O, cyanide and nitric oxide. These structures reveal a remarkable feature: the nitrophorins have a broadly open distal pocket in the absence of NO, but upon NO binding, three or more water molecules are expelled and two loops fold into the distal pocket, resulting in the packing of hydrophobic groups around the NO molecule and increased distortion of the heme. In this way, the protein apparently forms a 'hydrophobic trap' for the NO molecule. The structures are very accurate, ranging between 1.6 and 1.4 A resolutions.
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'''CRYSTAL STRUCTURE OF NITROPHORIN 4 COMPLEXED WITH CN'''
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Nitric oxide binding to nitrophorin 4 induces complete distal pocket burial.,Weichsel A, Andersen JF, Roberts SA, Montfort WR Nat Struct Biol. 2000 Jul;7(7):551-4. PMID:10876239<ref>PMID:10876239</ref>
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==Overview==
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The nitrophorins comprise an unusual family of proteins that use ferric (Fe(III)) heme to transport highly reactive nitric oxide (NO) from the salivary gland of a blood sucking bug to the victim, resulting in vasodilation and reduced blood coagulation. We have determined structures of nitrophorin 4 in complexes with H2O, cyanide and nitric oxide. These structures reveal a remarkable feature: the nitrophorins have a broadly open distal pocket in the absence of NO, but upon NO binding, three or more water molecules are expelled and two loops fold into the distal pocket, resulting in the packing of hydrophobic groups around the NO molecule and increased distortion of the heme. In this way, the protein apparently forms a 'hydrophobic trap' for the NO molecule. The structures are very accurate, ranging between 1.6 and 1.4 A resolutions.
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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1EQD is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Rhodnius_prolixus Rhodnius prolixus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQD OCA].
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</div>
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<div class="pdbe-citations 1eqd" style="background-color:#fffaf0;"></div>
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==Reference==
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==See Also==
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Nitric oxide binding to nitrophorin 4 induces complete distal pocket burial., Weichsel A, Andersen JF, Roberts SA, Montfort WR, Nat Struct Biol. 2000 Jul;7(7):551-4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10876239 10876239]
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*[[Nitrophorin|Nitrophorin]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Rhodnius prolixus]]
[[Category: Rhodnius prolixus]]
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[[Category: Single protein]]
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[[Category: Andersen JF]]
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[[Category: Andersen, J F.]]
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[[Category: Montfort WR]]
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[[Category: Montfort, W R.]]
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[[Category: Roberts SA]]
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[[Category: Roberts, S A.]]
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[[Category: Weichsel A]]
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[[Category: Weichsel, A.]]
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[[Category: Beta barrel]]
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[[Category: Cyanide]]
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[[Category: Ferric heme]]
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[[Category: Lipocalin fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:24:25 2008''
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Current revision

CRYSTAL STRUCTURE OF NITROPHORIN 4 COMPLEXED WITH CN

PDB ID 1eqd

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