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3hzd
From Proteopedia
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| - | [[Image:3hzd.png|left|200px]] | ||
| - | + | ==Crystal structure of bothropstoxin-I (BthTX-I), a PLA2 homologue from Bothrops jararacussu venom== | |
| - | + | <StructureSection load='3hzd' size='340' side='right'caption='[[3hzd]], [[Resolution|resolution]] 1.91Å' scene=''> | |
| - | + | == Structural highlights == | |
| - | + | <table><tr><td colspan='2'>[[3hzd]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bothrops_jararacussu Bothrops jararacussu]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3HZD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3HZD 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]] 1.91Å</td></tr> | |
| - | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=LI:LITHIUM+ION'>LI</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=3hzd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hzd OCA], [https://pdbe.org/3hzd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3hzd RCSB], [https://www.ebi.ac.uk/pdbsum/3hzd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3hzd ProSAT]</span></td></tr> | |
| - | + | </table> | |
| - | + | == Function == | |
| - | + | [https://www.uniprot.org/uniprot/PA2H1_BOTJR PA2H1_BOTJR] Snake venom phospholipase A2 homolog that lacks enzymatic activity. Shows local myotoxic activity (PubMed:11018293, PubMed:12079495, PubMed:31906173). Induces inflammation, since it induces edema and leukocytes infiltration (PubMed:11018293, PubMed:31906173). In addition, it induces NLRP3 NLRP3, ASC (PYCARD), caspase-1 (CASP1), and IL-1beta (IL1B) gene expression in the gastrocnemius muscle, showing that it is able to activate NLRP3 inflammasome (PubMed:31906173). It also damages artificial and myoblast membranes by a calcium-independent mechanism, has bactericidal activity, and induces neuromuscular blockade (PubMed:27531710). A model of myotoxic mechanism has been proposed: an apo Lys49-PLA2 is activated by the entrance of a hydrophobic molecule (e.g. fatty acid) at the hydrophobic channel of the protein leading to a reorientation of a monomer (PubMed:27531710) (By similarity). This reorientation causes a transition between 'inactive' to 'active' states, causing alignment of C-terminal and membrane-docking sites (MDoS) side-by-side and putting the membrane-disruption sites (MDiS) in the same plane, exposed to solvent and in a symmetric position for both monomers (PubMed:27531710) (By similarity). The MDoS region stabilizes the toxin on membrane by the interaction of charged residues with phospholipid head groups (PubMed:27531710) (By similarity). Subsequently, the MDiS region destabilizes the membrane with penetration of hydrophobic residues (PubMed:27531710) (By similarity). This insertion causes a disorganization of the membrane, allowing an uncontrolled influx of ions (i.e. calcium and sodium), and eventually triggering irreversible intracellular alterations and cell death (PubMed:27531710) (By similarity).[UniProtKB:I6L8L6]<ref>PMID:11018293</ref> <ref>PMID:11829743</ref> <ref>PMID:12079495</ref> <ref>PMID:17157889</ref> <ref>PMID:17346668</ref> <ref>PMID:18160090</ref> <ref>PMID:27531710</ref> <ref>PMID:3176051</ref> <ref>PMID:31906173</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/hz/3hzd_consurf.spt"</scriptWhenChecked> | |
| - | + | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |
| - | + | <text>to colour the structure by Evolutionary Conservation</text> | |
| - | == | + | </jmolCheckbox> |
| - | [[3hzd]] is a 2 chain structure | + | </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=3hzd ConSurf]. |
| + | <div style="clear:both"></div> | ||
==See Also== | ==See Also== | ||
| - | *[[Phospholipase A2]] | + | *[[Phospholipase A2 3D structures|Phospholipase A2 3D structures]] |
| - | + | *[[Phospholipase A2 homolog|Phospholipase A2 homolog]] | |
| - | == | + | == References == |
| - | < | + | <references/> |
| + | __TOC__ | ||
| + | </StructureSection> | ||
[[Category: Bothrops jararacussu]] | [[Category: Bothrops jararacussu]] | ||
| - | [[Category: | + | [[Category: Large Structures]] |
| - | [[Category: | + | [[Category: Fernandes CAH]] |
| - | [[Category: | + | [[Category: Fontes MRM]] |
| - | [[Category: | + | [[Category: Marchi-Salvador DP]] |
| - | + | [[Category: Silva MCO]] | |
| - | + | [[Category: Soares AM]] | |
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Current revision
Crystal structure of bothropstoxin-I (BthTX-I), a PLA2 homologue from Bothrops jararacussu venom
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