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== | ==Crystal Structure of Eosinophil Cationic Protein in Complex with 2',5'-ADP at 2.0 A resolution Reveals the Details of the Ribonucleolytic Active site== | ||
Eosinophil cationic protein (ECP) is a component of the eosinophil granule | <StructureSection load='1h1h' size='340' side='right'caption='[[1h1h]], [[Resolution|resolution]] 2.00Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1h1h]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H1H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1H1H FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A2P:ADENOSINE-2-5-DIPHOSPHATE'>A2P</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=1h1h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h1h OCA], [https://pdbe.org/1h1h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1h1h RCSB], [https://www.ebi.ac.uk/pdbsum/1h1h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1h1h ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/ECP_HUMAN ECP_HUMAN] Cytotoxin and helminthotoxin with low-efficiency ribonuclease activity. Possesses a wide variety of biological activities. Exhibits antibacterial activity, including cytoplasmic membrane depolarization of preferentially Gram-negative, but also Gram-positive strains. Promotes E.coli outer membrane detachment, alteration of the overall cell shape and partial loss of cell content.<ref>PMID:2501794</ref> <ref>PMID:19450231</ref> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/h1/1h1h_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</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=1h1h ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Eosinophil cationic protein (ECP) is a component of the eosinophil granule matrix. It shows marked toxicity against helminth parasites, bacteria single-stranded RNA viruses, and host epithelial cells. Secretion of human ECP is related to eosinophil-associated allergic, asthmatic, and inflammatory diseases. ECP belongs to the pancreatic ribonuclease superfamily of proteins, and the crystal structure of ECP in the unliganded form (determined previously) exhibited a conserved RNase A fold [Boix, E., et al. (1999) Biochemistry 38, 16794-16801]. We have now determined a high-resolution (2.0 A) crystal structure of ECP in complex with adenosine 2',5'-diphosphate (2',5'-ADP) which has revealed the details of the ribonucleolytic active site. Residues Gln-14, His-15, and Lys-38 make hydrogen bond interactions with the phosphate at the P(1) site, while His-128 interacts with the purine ring at the B(2) site. A new phosphate binding site, P(-)(1), has been identified which involves Arg-34. This study is the first detailed structural analysis of the nucleotide recognition site in ECP and provides a starting point for the understanding of its substrate specificity and low catalytic efficiency compared with that of the eosinophil-derived neurotoxin (EDN), a close homologue. | |||
The crystal structure of eosinophil cationic protein in complex with 2',5'-ADP at 2.0 A resolution reveals the details of the ribonucleolytic active site.,Mohan CG, Boix E, Evans HR, Nikolovski Z, Nogues MV, Cuchillo CM, Acharya KR Biochemistry. 2002 Oct 8;41(40):12100-6. PMID:12356310<ref>PMID:12356310</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1h1h" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Ribonuclease 3D structures|Ribonuclease 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Acharya | [[Category: Acharya KR]] | ||
[[Category: Boix | [[Category: Boix E]] | ||
[[Category: Cuchillo | [[Category: Cuchillo CM]] | ||
[[Category: Evans | [[Category: Evans HR]] | ||
[[Category: Mohan | [[Category: Mohan CG]] | ||
[[Category: Nikolovski | [[Category: Nikolovski Z]] | ||
[[Category: Nogues | [[Category: Nogues MV]] | ||