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<StructureSection load='2asn' size='340' side='right'caption='[[2asn]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
<StructureSection load='2asn' size='340' side='right'caption='[[2asn]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2asn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Rhopr Rhopr]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ASN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ASN FirstGlance]. <br>
<table><tr><td colspan='2'>[[2asn]] 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=2ASN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ASN FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1pee|1pee]], [[1pm1|1pm1]]</div></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene></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=2asn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2asn OCA], [https://pdbe.org/2asn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2asn RCSB], [https://www.ebi.ac.uk/pdbsum/2asn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2asn 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=2asn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2asn OCA], [https://pdbe.org/2asn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2asn RCSB], [https://www.ebi.ac.uk/pdbsum/2asn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2asn ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/NP2_RHOPR NP2_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).  Specifically inhibits factor IXa-catalyzed activation of factor X in the presence of calcium and phospholipids irrespective of the presence or absence of factor VIIIa.  
[https://www.uniprot.org/uniprot/NP2_RHOPR NP2_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).  Specifically inhibits factor IXa-catalyzed activation of factor X in the presence of calcium and phospholipids irrespective of the presence or absence of factor VIIIa.
== 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=2asn 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=2asn ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Nitrophorin 2 (NP2) (also known as prolixin-S) is a salivary protein that transports nitric oxide, binds histamine, and acts as an anticoagulant during blood feeding by the insect Rhodnius prolixus. The 2.0-A crystal structure of NP2 reveals an eight-stranded antiparallel beta-barrel containing a ferric heme coordinated through His(57), similar to the structures of NP1 and NP4. All four Rhodnius nitrophorins transport NO and sequester histamine through heme binding, but only NP2 acts as an anticoagulant. Here, we demonstrate that recombinant NP2, but not recombinant NP1 or NP4, is a potent anticoagulant; recombinant NP3 also displays minor activity. Comparison of the nitrophorin structures suggests that a surface region near the C terminus and the loops between beta strands B-C and E-F is responsible for the anticoagulant activity. NP2 also displays larger NO association rates and smaller dissociation rates than NP1 and NP4, which may result from a more open and more hydrophobic distal pocket, allowing more rapid solvent reorganization on ligand binding. The NP2 protein core differs from NP1 and NP4 in that buried Glu(53), which allows for larger NO release rates when deprotonated, hydrogen bonds to invariant Tyr(81). Surprisingly, this tyrosine lies on the protein surface in NP1 and NP4.
The crystal structure of nitrophorin 2. A trifunctional antihemostatic protein from the saliva of Rhodnius prolixus.,Andersen JF, Montfort WR J Biol Chem. 2000 Sep 29;275(39):30496-503. PMID:10884386<ref>PMID:10884386</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2asn" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Nitrophorin|Nitrophorin]]
*[[Nitrophorin|Nitrophorin]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Rhopr]]
[[Category: Rhodnius prolixus]]
[[Category: Berry, R E]]
[[Category: Berry RE]]
[[Category: Montfort, W R]]
[[Category: Montfort WR]]
[[Category: Walker, F A]]
[[Category: Walker FA]]
[[Category: Weichsel, A]]
[[Category: Weichsel A]]
[[Category: Beta barrel]]
[[Category: Ferric heme]]
[[Category: Imidazole]]
[[Category: Lipocalin]]
[[Category: Transport protein]]

Revision as of 07:29, 23 August 2023

Crystal structure of D1A mutant of nitrophorin 2 complexed with imidazole

2asn, resolution 1.70Å

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