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==CRYSTAL STRUCTURE OF RTX DOMAIN BLOCK V OF ADENYLATE CYCLASE TOXIN FROM BORDETELLA PERTUSSIS== | ==CRYSTAL STRUCTURE OF RTX DOMAIN BLOCK V OF ADENYLATE CYCLASE TOXIN FROM BORDETELLA PERTUSSIS== | ||
<StructureSection load='5cvw' size='340' side='right' caption='[[5cvw]], [[Resolution|resolution]] 1.25Å' scene=''> | <StructureSection load='5cvw' size='340' side='right'caption='[[5cvw]], [[Resolution|resolution]] 1.25Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5cvw]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CVW OCA]. For a <b>guided tour on the structure components</b> use [ | <table><tr><td colspan='2'>[[5cvw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bordetella_pertussis_18323 Bordetella pertussis 18323]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CVW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5CVW FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.25Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5cvw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5cvw OCA], [https://pdbe.org/5cvw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5cvw RCSB], [https://www.ebi.ac.uk/pdbsum/5cvw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5cvw ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://www.uniprot.org/uniprot/CYAA_BORP1 CYAA_BORP1] This adenylate cyclase belongs to a special class of bacterial toxin. It causes whooping cough by acting on mammalian cells by elevating cAMP-concentration and thus disrupts normal cell function.<ref>PMID:2905265</ref> | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Calcium-binding RTX proteins are equipped with C-terminal secretion signals and translocate from the Ca(2+)-depleted cytosol of Gram-negative bacteria directly into the Ca(2+)-rich external milieu, passing through the "channel-tunnel" ducts of type I secretion systems (T1SSs). Using Bordetella pertussis adenylate cyclase toxin, we solved the structure of an essential C-terminal assembly that caps the RTX domains of RTX family leukotoxins. This is shown to scaffold directional Ca(2+)-dependent folding of the carboxy-proximal RTX repeat blocks into beta-rolls. The resulting intramolecular Brownian ratchets then prevent backsliding of translocating RTX proteins in the T1SS conduits and thereby accelerate excretion of very large RTX leukotoxins from bacterial cells by a vectorial "push-ratchet" mechanism. Successive Ca(2+)-dependent and cosecretional acquisition of a functional RTX toxin structure in the course of T1SS-mediated translocation, through RTX domain folding from the C-terminal cap toward the N terminus, sets a paradigm that opens for design of virulence inhibitors of major pathogens. | |||
Calcium-Driven Folding of RTX Domain beta-Rolls Ratchets Translocation of RTX Proteins through Type I Secretion Ducts.,Bumba L, Masin J, Macek P, Wald T, Motlova L, Bibova I, Klimova N, Bednarova L, Veverka V, Kachala M, Svergun DI, Barinka C, Sebo P Mol Cell. 2016 Apr 7;62(1):47-62. doi: 10.1016/j.molcel.2016.03.018. PMID:27058787<ref>PMID:27058787</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 5cvw" style="background-color:#fffaf0;"></div> | |||
== References == | == References == | ||
<references/> | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: | [[Category: Bordetella pertussis 18323]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: Barinka C]] | ||
[[Category: | [[Category: Bumba L]] | ||
[[Category: | [[Category: Motlova L]] | ||
Latest revision as of 14:23, 10 January 2024
CRYSTAL STRUCTURE OF RTX DOMAIN BLOCK V OF ADENYLATE CYCLASE TOXIN FROM BORDETELLA PERTUSSISCRYSTAL STRUCTURE OF RTX DOMAIN BLOCK V OF ADENYLATE CYCLASE TOXIN FROM BORDETELLA PERTUSSIS
Structural highlights
FunctionCYAA_BORP1 This adenylate cyclase belongs to a special class of bacterial toxin. It causes whooping cough by acting on mammalian cells by elevating cAMP-concentration and thus disrupts normal cell function.[1] Publication Abstract from PubMedCalcium-binding RTX proteins are equipped with C-terminal secretion signals and translocate from the Ca(2+)-depleted cytosol of Gram-negative bacteria directly into the Ca(2+)-rich external milieu, passing through the "channel-tunnel" ducts of type I secretion systems (T1SSs). Using Bordetella pertussis adenylate cyclase toxin, we solved the structure of an essential C-terminal assembly that caps the RTX domains of RTX family leukotoxins. This is shown to scaffold directional Ca(2+)-dependent folding of the carboxy-proximal RTX repeat blocks into beta-rolls. The resulting intramolecular Brownian ratchets then prevent backsliding of translocating RTX proteins in the T1SS conduits and thereby accelerate excretion of very large RTX leukotoxins from bacterial cells by a vectorial "push-ratchet" mechanism. Successive Ca(2+)-dependent and cosecretional acquisition of a functional RTX toxin structure in the course of T1SS-mediated translocation, through RTX domain folding from the C-terminal cap toward the N terminus, sets a paradigm that opens for design of virulence inhibitors of major pathogens. Calcium-Driven Folding of RTX Domain beta-Rolls Ratchets Translocation of RTX Proteins through Type I Secretion Ducts.,Bumba L, Masin J, Macek P, Wald T, Motlova L, Bibova I, Klimova N, Bednarova L, Veverka V, Kachala M, Svergun DI, Barinka C, Sebo P Mol Cell. 2016 Apr 7;62(1):47-62. doi: 10.1016/j.molcel.2016.03.018. PMID:27058787[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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