3j9c

From Proteopedia

(Difference between revisions)

Revision as of 02:02, 11 March 2017

CryoEM single particle reconstruction of anthrax toxin protective antigen pore at 2.9 Angstrom resolution

Structural highlights

3j9c is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[PAG_BACAN] One of the three proteins composing the anthrax toxin, the agent which infects many mammalian species and that may cause death. PA binds to a receptor (ATR) in sensitive eukaryotic cells, thereby facilitating the translocation of the enzymatic toxin components, edema factor and lethal factor, across the target cell membrane. PA associated with LF causes death when injected, PA associated with EF produces edema. PA induces immunity to infection with anthrax.

Publication Abstract from PubMed

Anthrax toxin, comprising protective antigen, lethal factor, and oedema factor, is the major virulence factor of Bacillus anthracis, an agent that causes high mortality in humans and animals. Protective antigen forms oligomeric prepores that undergo conversion to membrane-spanning pores by endosomal acidification, and these pores translocate the enzymes lethal factor and oedema factor into the cytosol of target cells. Protective antigen is not only a vaccine component and therapeutic target for anthrax infections but also an excellent model system for understanding the mechanism of protein translocation. On the basis of biochemical and electrophysiological results, researchers have proposed that a phi (Phi)-clamp composed of phenylalanine (Phe)427 residues of protective antigen catalyses protein translocation via a charge-state-dependent Brownian ratchet. Although atomic structures of protective antigen prepores are available, how protective antigen senses low pH, converts to active pore, and translocates lethal factor and oedema factor are not well defined without an atomic model of its pore. Here, by cryo-electron microscopy with direct electron counting, we determine the protective antigen pore structure at 2.9-A resolution. The structure reveals the long-sought-after catalytic Phi-clamp and the membrane-spanning translocation channel, and supports the Brownian ratchet model for protein translocation. Comparisons of four structures reveal conformational changes in prepore to pore conversion that support a multi-step mechanism by which low pH is sensed and the membrane-spanning channel is formed.

Atomic structure of anthrax protective antigen pore elucidates toxin translocation.,Jiang J, Pentelute BL, Collier RJ, Zhou ZH Nature. 2015 May 28;521(7553):545-9. doi: 10.1038/nature14247. Epub 2015 Mar 16. PMID:25778700^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Jiang J, Pentelute BL, Collier RJ, Zhou ZH. Atomic structure of anthrax protective antigen pore elucidates toxin translocation. Nature. 2015 May 28;521(7553):545-9. doi: 10.1038/nature14247. Epub 2015 Mar 16. PMID:25778700 doi:http://dx.doi.org/10.1038/nature14247

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/3j9c"

@@ Line 1: / Line 1: @@
 ==CryoEM single particle reconstruction of anthrax toxin protective antigen pore at 2.9 Angstrom resolution==
 <StructureSection load='3j9c' size='340' side='right' caption='[[3j9c]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[3j9c]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3J9C OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3J9C 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></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3j9c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3j9c OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3j9c RCSB], [http://www.ebi.ac.uk/pdbsum/3j9c PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3j9c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3j9c OCA], [http://pdbe.org/3j9c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3j9c RCSB], [http://www.ebi.ac.uk/pdbsum/3j9c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3j9c ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 16: / Line 17: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 3j9c" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Anthrax protective antigen|Anthrax protective antigen]]
 == References ==
 <references/>

3j9c

From Proteopedia

Revision as of 02:02, 11 March 2017

CryoEM single particle reconstruction of anthrax toxin protective antigen pore at 2.9 Angstrom resolution

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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