6u2k

From Proteopedia

(Difference between revisions)

Current revision

EM structure of MPEG-1 (L425K, alpha conformation) soluble pre-pore complex

6u2k, resolution 2.93Å

Structural highlights

6u2k is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 2.93Å
Ligands:
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

MPEG1_HUMAN Plays a key role in the innate immune response following bacterial infection by inserting into the bacterial surface to form pores (By similarity). By breaching the surface of phagocytosed bacteria, allows antimicrobial effectors to enter the bacterial periplasmic space and degrade bacterial proteins such as superoxide dismutase sodC which contributes to bacterial virulence (By similarity). Shows antibacterial activity against a wide spectrum of Gram-positive, Gram-negative and acid-fast bacteria (PubMed:23753625, PubMed:26402460, PubMed:30609079). Reduces the viability of the intracytosolic pathogen L.monocytogenes by inhibiting acidification of the phagocytic vacuole of host cells which restricts bacterial translocation from the vacuole to the cytosol (By similarity). Required for the antibacterial activity of reactive oxygen species and nitric oxide (By similarity).[UniProtKB:A1L314]^[1] ^[2] ^[3]

Publication Abstract from PubMed

Macrophage-expressed gene 1 (MPEG1/Perforin-2) is a perforin-like protein that functions within the phagolysosome to damage engulfed microbes. MPEG1 is thought to form pores in target membranes, however, its mode of action remains unknown. We use cryo-Electron Microscopy (cryo-EM) to determine the 2.4 A structure of a hexadecameric assembly of MPEG1 that displays the expected features of a soluble prepore complex. We further discover that MPEG1 prepore-like assemblies can be induced to perforate membranes through acidification, such as would occur within maturing phagolysosomes. We next solve the 3.6 A cryo-EM structure of MPEG1 in complex with liposomes. These data reveal that a multi-vesicular body of 12 kDa (MVB12)-associated beta-prism (MABP) domain binds membranes such that the pore-forming machinery of MPEG1 is oriented away from the bound membrane. This unexpected mechanism of membrane interaction suggests that MPEG1 remains bound to the phagolysosome membrane while simultaneously forming pores in engulfed bacterial targets.

The cryo-EM structure of the acid activatable pore-forming immune effector Macrophage-expressed gene 1.,Pang SS, Bayly-Jones C, Radjainia M, Spicer BA, Law RHP, Hodel AW, Parsons ES, Ekkel SM, Conroy PJ, Ramm G, Venugopal H, Bird PI, Hoogenboom BW, Voskoboinik I, Gambin Y, Sierecki E, Dunstone MA, Whisstock JC Nat Commun. 2019 Sep 19;10(1):4288. doi: 10.1038/s41467-019-12279-2. PMID:31537793^[4]

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

References

↑ Fields KA, McCormack R, de Armas LR, Podack ER. Perforin-2 restricts growth of Chlamydia trachomatis in macrophages. Infect Immun. 2013 Aug;81(8):3045-54. doi: 10.1128/IAI.00497-13. Epub 2013 Jun, 10. PMID:23753625 doi:http://dx.doi.org/10.1128/IAI.00497-13
↑ McCormack RM, de Armas LR, Shiratsuchi M, Fiorentino DG, Olsson ML, Lichtenheld MG, Morales A, Lyapichev K, Gonzalez LE, Strbo N, Sukumar N, Stojadinovic O, Plano GV, Munson GP, Tomic-Canic M, Kirsner RS, Russell DG, Podack ER. Perforin-2 is essential for intracellular defense of parenchymal cells and phagocytes against pathogenic bacteria. Elife. 2015 Sep 24;4. doi: 10.7554/eLife.06508. PMID:26402460 doi:http://dx.doi.org/10.7554/eLife.06508
↑ Strbo N, Pastar I, Romero L, Chen V, Vujanac M, Sawaya AP, Jozic I, Ferreira ADF, Wong LL, Head C, Stojadinovic O, Garcia D, O'Neill K, Drakulich S, Taller S, Kirsner RS, Tomic-Canic M. Single cell analyses reveal specific distribution of anti-bacterial molecule Perforin-2 in human skin and its modulation by wounding and Staphylococcus aureus infection. Exp Dermatol. 2019 Mar;28(3):225-232. doi: 10.1111/exd.13870. Epub 2019 Feb 12. PMID:30609079 doi:http://dx.doi.org/10.1111/exd.13870
↑ Pang SS, Bayly-Jones C, Radjainia M, Spicer BA, Law RHP, Hodel AW, Parsons ES, Ekkel SM, Conroy PJ, Ramm G, Venugopal H, Bird PI, Hoogenboom BW, Voskoboinik I, Gambin Y, Sierecki E, Dunstone MA, Whisstock JC. The cryo-EM structure of the acid activatable pore-forming immune effector Macrophage-expressed gene 1. Nat Commun. 2019 Sep 19;10(1):4288. doi: 10.1038/s41467-019-12279-2. PMID:31537793 doi:http://dx.doi.org/10.1038/s41467-019-12279-2

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/6u2k"

Categories: Homo sapiens | Large Structures | Bayly-Jones C | Pang SS

@@ Line 3: / Line 3: @@
 <SX load='6u2k' size='340' side='right' viewer='molstar' caption='[[6u2k]], [[Resolution|resolution]] 2.93&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6u2k]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6U2K OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6U2K FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6u2k]] 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=6U2K OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6U2K FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.93&#8491;</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MPEG1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6u2k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6u2k OCA], [http://pdbe.org/6u2k PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6u2k RCSB], [http://www.ebi.ac.uk/pdbsum/6u2k PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6u2k 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=6u2k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6u2k OCA], [https://pdbe.org/6u2k PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6u2k RCSB], [https://www.ebi.ac.uk/pdbsum/6u2k PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6u2k ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[http://www.uniprot.org/uniprot/MPEG1_HUMAN MPEG1_HUMAN]] Plays a key role in the innate immune response following bacterial infection by inserting into the bacterial surface to form pores (By similarity). By breaching the surface of phagocytosed bacteria, allows antimicrobial effectors to enter the bacterial periplasmic space and degrade bacterial proteins such as superoxide dismutase sodC which contributes to bacterial virulence (By similarity). Shows antibacterial activity against a wide spectrum of Gram-positive, Gram-negative and acid-fast bacteria (PubMed:23753625, PubMed:26402460, PubMed:30609079). Reduces the viability of the intracytosolic pathogen L.monocytogenes by inhibiting acidification of the phagocytic vacuole of host cells which restricts bacterial translocation from the vacuole to the cytosol (By similarity). Required for the antibacterial activity of reactive oxygen species and nitric oxide (By similarity).[UniProtKB:A1L314]<ref>PMID:23753625</ref> <ref>PMID:26402460</ref> <ref>PMID:30609079</ref>
+[https://www.uniprot.org/uniprot/MPEG1_HUMAN MPEG1_HUMAN] Plays a key role in the innate immune response following bacterial infection by inserting into the bacterial surface to form pores (By similarity). By breaching the surface of phagocytosed bacteria, allows antimicrobial effectors to enter the bacterial periplasmic space and degrade bacterial proteins such as superoxide dismutase sodC which contributes to bacterial virulence (By similarity). Shows antibacterial activity against a wide spectrum of Gram-positive, Gram-negative and acid-fast bacteria (PubMed:23753625, PubMed:26402460, PubMed:30609079). Reduces the viability of the intracytosolic pathogen L.monocytogenes by inhibiting acidification of the phagocytic vacuole of host cells which restricts bacterial translocation from the vacuole to the cytosol (By similarity). Required for the antibacterial activity of reactive oxygen species and nitric oxide (By similarity).[UniProtKB:A1L314]<ref>PMID:23753625</ref> <ref>PMID:26402460</ref> <ref>PMID:30609079</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 19: / Line 19: @@
 </div>
 <div class="pdbe-citations 6u2k" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Cytolysin 3D structures|Cytolysin 3D structures]]
 == References ==
 <references/>
 __TOC__
 </SX>
-[[Category: Human]]
+[[Category: Homo sapiens]]
 [[Category: Large Structures]]
-[[Category: Bayly-Jones, C]]
+[[Category: Bayly-Jones C]]
-[[Category: Pang, S S]]
+[[Category: Pang SS]]
-[[Category: Immune system]]
-[[Category: Immunity]]
-[[Category: Macpf]]
-[[Category: Macrophage]]
-[[Category: Mpeg-1/perforin-2]]
-[[Category: Pore forming protein]]

6u2k

From Proteopedia

Current revision

EM structure of MPEG-1 (L425K, alpha conformation) soluble pre-pore complex

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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