5umi

From Proteopedia

(Difference between revisions)

Current revision

Clostridium difficile TcdA-CROPs bound to PA50 Fab

Structural highlights

5umi is a 5 chain structure with sequence from Clostridioides difficile and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 3.23Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TCDA_CLODI Precursor of a cytotoxin that targets and disrupts the colonic epithelium, inducing the host inflammatory and innate immune responses and resulting in diarrhea and pseudomembranous colitis (PubMed:20844489). TcdA and TcdB constitute the main toxins that mediate the pathology of C.difficile infection, an opportunistic pathogen that colonizes the colon when the normal gut microbiome is disrupted (PubMed:19252482, PubMed:20844489). Compared to TcdB, TcdA is less virulent and less important for inducing the host inflammatory and innate immune responses (PubMed:19252482). This form constitutes the precursor of the toxin: it enters into host cells and mediates autoprocessing to release the active toxin (Glucosyltransferase TcdA) into the host cytosol (By similarity). Targets colonic epithelia by binding to some receptor, and enters host cells via clathrin-mediated endocytosis (By similarity). Binding to LDLR, as well as carbohydrates and sulfated glycosaminoglycans on host cell surface contribute to entry into cells (PubMed:1670930, PubMed:31160825, PubMed:16622409). In contrast to TcdB, Frizzled receptors FZD1, FZD2 and FZD7 do not act as host receptors in the colonic epithelium for TcdA (PubMed:27680706). Once entered into host cells, acidification in the endosome promotes the membrane insertion of the translocation region and formation of a pore, leading to translocation of the GT44 and peptidase C80 domains across the endosomal membrane (By similarity). This activates the peptidase C80 domain and autocatalytic processing, releasing the N-terminal part (Glucosyltransferase TcdA), which constitutes the active part of the toxin, in the cytosol (PubMed:17334356, PubMed:19553670, PubMed:27571750).[UniProtKB:P18177]^[1] ^[2] ^[3] ^[4] ^[5] ^[6] ^[7] ^[8] ^[9] Active form of the toxin, which is released into the host cytosol following autoprocessing and inactivates small GTPases (PubMed:7775453, PubMed:24905543, PubMed:30622517, PubMed:22747490, PubMed:22267739). Acts by mediating monoglucosylation of small GTPases of the Rho family (Rac1, RhoA, RhoB, RhoC, Rap2A and Cdc42) in host cells at the conserved threonine residue located in the switch I region ('Thr-37/35'), using UDP-alpha-D-glucose as the sugar donor (PubMed:7775453, PubMed:24905543, PubMed:30622517, PubMed:22747490, PubMed:22267739). Monoglucosylation of host small GTPases completely prevents the recognition of the downstream effector, blocking the GTPases in their inactive form, leading to actin cytoskeleton disruption and cell death, resulting in the loss of colonic epithelial barrier function (PubMed:7775453). Also able to catalyze monoglucosylation of some members of the Ras family (H-Ras/HRAS, K-Ras/KRAS and N-Ras/NRAS), but with much less efficiency than with Rho proteins, suggesting that it does not act on Ras proteins in vivo (PubMed:30622517).^[10] ^[11] ^[12] ^[13] ^[14]

Publication Abstract from PubMed

Clostridium difficile is a clinically significant pathogen that causes mild-to-severe (and often recurrent) colon infections. Disease symptoms stem from the activities of two large, multidomain toxins known as TcdA and TcdB. The toxins can bind, enter, and perturb host cell function through a multistep mechanism of receptor binding, endocytosis, pore formation, autoproteolysis, and glucosyltransferase-mediated modification of host substrates. Monoclonal antibodies that neutralize toxin activity provide a survival benefit in preclinical animal models and prevent recurrent infections in human clinical trials. However, the molecular mechanisms involved in these neutralizing activities are unclear. To this end, we performed structural studies on a neutralizing monoclonal antibody, PA50, a humanized mAb with both potent and broad-spectrum neutralizing activity, in complex with TcdA. Electron microscopy imaging and multiangle light-scattering analysis revealed that PA50 binds multiple sites on the TcdA C-terminal combined repetitive oligopeptides (CROPs) domain. A crystal structure of two PA50 Fabs bound to a segment of the TcdA CROPs helped define a conserved epitope that is distinct from previously identified carbohydrate-binding sites. Binding of TcdA to the host cell surface was directly blocked by either PA50 mAb or Fab and suggested that receptor blockade is the mechanism by which PA50 neutralizes TcdA. These findings highlight the importance of the CROPs C terminus in cell-surface binding and a role for neutralizing antibodies in defining structural features critical to a pathogen's mechanism of action. We conclude that PA50 protects host cells by blocking the binding of TcdA to cell surfaces.

Use of a neutralizing antibody helps identify structural features critical for binding of Clostridium difficile toxin TcdA to the host cell surface.,Kroh HK, Chandrasekaran R, Rosenthal K, Woods R, Jin X, Ohi MD, Nyborg AC, Rainey GJ, Warrener P, Spiller BW, Lacy DB J Biol Chem. 2017 Sep 1;292(35):14401-14412. doi: 10.1074/jbc.M117.781112. Epub, 2017 Jul 13. PMID:28705932^[15]

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

References

↑ Greco A, Ho JG, Lin SJ, Palcic MM, Rupnik M, Ng KK. Carbohydrate recognition by Clostridium difficile toxin A. Nat Struct Mol Biol. 2006 May;13(5):460-1. Epub 2006 Apr 16. PMID:16622409 doi:http://dx.doi.org/10.1038/nsmb1084
↑ Tucker KD, Wilkins TD. Toxin A of Clostridium difficile binds to the human carbohydrate antigens I, X, and Y. Infect Immun. 1991 Jan;59(1):73-8. doi: 10.1128/iai.59.1.73-78.1991. PMID:1670930 doi:http://dx.doi.org/10.1128/iai.59.1.73-78.1991
↑ Reineke J, Tenzer S, Rupnik M, Koschinski A, Hasselmayer O, Schrattenholz A, Schild H, von Eichel-Streiber C. Autocatalytic cleavage of Clostridium difficile toxin B. Nature. 2007 Mar 22;446(7134):415-9. doi: 10.1038/nature05622. Epub 2007 Mar 4. PMID:17334356 doi:http://dx.doi.org/10.1038/nature05622
↑ Lyras D, O'Connor JR, Howarth PM, Sambol SP, Carter GP, Phumoonna T, Poon R, Adams V, Vedantam G, Johnson S, Gerding DN, Rood JI. Toxin B is essential for virulence of Clostridium difficile. Nature. 2009 Apr 30;458(7242):1176-9. doi: 10.1038/nature07822. Epub 2009 Mar 1. PMID:19252482 doi:http://dx.doi.org/10.1038/nature07822
↑ Pruitt RN, Chagot B, Cover M, Chazin WJ, Spiller B, Lacy DB. Structure-function analysis of inositol hexakisphosphate-induced autoprocessing in Clostridium difficile toxin A. J Biol Chem. 2009 Aug 14;284(33):21934-40. Epub 2009 Jun 24. PMID:19553670 doi:10.1074/jbc.M109.018929
↑ Kuehne SA, Cartman ST, Heap JT, Kelly ML, Cockayne A, Minton NP. The role of toxin A and toxin B in Clostridium difficile infection. Nature. 2010 Oct 7;467(7316):711-3. doi: 10.1038/nature09397. Epub 2010 Sep 15. PMID:20844489 doi:http://dx.doi.org/10.1038/nature09397
↑ Chumbler NM, Rutherford SA, Zhang Z, Farrow MA, Lisher JP, Farquhar E, Giedroc DP, Spiller BW, Melnyk RA, Lacy DB. Crystal structure of Clostridium difficile toxin A. Nat Microbiol. 2016 Jan 11;1:15002. doi: 10.1038/nmicrobiol.2015.2. PMID:27571750 doi:http://dx.doi.org/10.1038/nmicrobiol.2015.2
↑ Tao L, Zhang J, Meraner P, Tovaglieri A, Wu X, Gerhard R, Zhang X, Stallcup WB, Miao J, He X, Hurdle JG, Breault DT, Brass AL, Dong M. Frizzled proteins are colonic epithelial receptors for C. difficile toxin B. Nature. 2016 Oct 20;538(7625):350-355. doi: 10.1038/nature19799. Epub 2016 Sep, 28. PMID:27680706 doi:http://dx.doi.org/10.1038/nature19799
↑ Tao L, Tian S, Zhang J, Liu Z, Robinson-McCarthy L, Miyashita SI, Breault DT, Gerhard R, Oottamasathien S, Whelan SPJ, Dong M. Sulfated glycosaminoglycans and low-density lipoprotein receptor contribute to Clostridium difficile toxin A entry into cells. Nat Microbiol. 2019 Oct;4(10):1760-1769. doi: 10.1038/s41564-019-0464-z. Epub, 2019 Jun 3. PMID:31160825 doi:http://dx.doi.org/10.1038/s41564-019-0464-z
↑ Pruitt RN, Chumbler NM, Rutherford SA, Farrow MA, Friedman DB, Spiller B, Lacy DB. Structural determinants of the Clostridium difficile toxin A glucosyltransferase activity. J Biol Chem. 2012 Jan 20. PMID:22267739 doi:10.1074/jbc.M111.298414
↑ D'Urzo N, Malito E, Biancucci M, Bottomley MJ, Maione D, Scarselli M, Martinelli M. The structure of Clostridium difficile TcdA-GT domain bound to Mn(2+) and UDP provides insight into glucosyltransferase activity and product release. FEBS J. 2012 Jul 2. doi: 10.1111/j.1742-4658.2012.08688.x. PMID:22747490 doi:10.1111/j.1742-4658.2012.08688.x
↑ Genth H, Pauillac S, Schelle I, Bouvet P, Bouchier C, Varela-Chavez C, Just I, Popoff MR. Haemorrhagic toxin and lethal toxin from Clostridium sordellii strain vpi9048: molecular characterization and comparative analysis of substrate specificity of the large clostridial glucosylating toxins. Cell Microbiol. 2014 Nov;16(11):1706-21. doi: 10.1111/cmi.12321. Epub 2014 Aug 4. PMID:24905543 doi:http://dx.doi.org/10.1111/cmi.12321
↑ Genth H, Junemann J, Lammerhirt CM, Lucke AC, Schelle I, Just I, Gerhard R, Pich A. Difference in Mono-O-Glucosylation of Ras Subtype GTPases Between Toxin A and Toxin B From Clostridioides difficile Strain 10463 and Lethal Toxin From Clostridium sordellii Strain 6018. Front Microbiol. 2018 Dec 21;9:3078. doi: 10.3389/fmicb.2018.03078. eCollection, 2018. PMID:30622517 doi:http://dx.doi.org/10.3389/fmicb.2018.03078
↑ Just I, Wilm M, Selzer J, Rex G, von Eichel-Streiber C, Mann M, Aktories K. The enterotoxin from Clostridium difficile (ToxA) monoglucosylates the Rho proteins. J Biol Chem. 1995 Jun 9;270(23):13932-6. doi: 10.1074/jbc.270.23.13932. PMID:7775453 doi:http://dx.doi.org/10.1074/jbc.270.23.13932
↑ Kroh HK, Chandrasekaran R, Rosenthal K, Woods R, Jin X, Ohi MD, Nyborg AC, Rainey GJ, Warrener P, Spiller BW, Lacy DB. Use of a neutralizing antibody helps identify structural features critical for binding of Clostridium difficile toxin TcdA to the host cell surface. J Biol Chem. 2017 Sep 1;292(35):14401-14412. doi: 10.1074/jbc.M117.781112. Epub, 2017 Jul 13. PMID:28705932 doi:http://dx.doi.org/10.1074/jbc.M117.781112

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/5umi"

@@ Line 1: / Line 1: @@
 ==Clostridium difficile TcdA-CROPs bound to PA50 Fab==
-<StructureSection load='5umi' size='340' side='right' caption='[[5umi]], [[Resolution|resolution]] 3.23&Aring;' scene=''>
+<StructureSection load='5umi' size='340' side='right'caption='[[5umi]], [[Resolution|resolution]] 3.23&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5umi]] is a 5 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5UMI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5UMI FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5umi]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Clostridioides_difficile Clostridioides difficile] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5UMI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5UMI FirstGlance]. <br>
-</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=5umi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5umi OCA], [http://pdbe.org/5umi PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5umi RCSB], [http://www.ebi.ac.uk/pdbsum/5umi PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5umi ProSAT]</span></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.23&#8491;</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=5umi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5umi OCA], [https://pdbe.org/5umi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5umi RCSB], [https://www.ebi.ac.uk/pdbsum/5umi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5umi ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[http://www.uniprot.org/uniprot/TOXA_PEPDI TOXA_PEPDI]] Only after the enteral delivery of the enterotoxin A may the characteristic disease called pseudomembranous colitis be induced.
+[https://www.uniprot.org/uniprot/TCDA_CLODI TCDA_CLODI] Precursor of a cytotoxin that targets and disrupts the colonic epithelium, inducing the host inflammatory and innate immune responses and resulting in diarrhea and pseudomembranous colitis (PubMed:20844489). TcdA and TcdB constitute the main toxins that mediate the pathology of C.difficile infection, an opportunistic pathogen that colonizes the colon when the normal gut microbiome is disrupted (PubMed:19252482, PubMed:20844489). Compared to TcdB, TcdA is less virulent and less important for inducing the host inflammatory and innate immune responses (PubMed:19252482). This form constitutes the precursor of the toxin: it enters into host cells and mediates autoprocessing to release the active toxin (Glucosyltransferase TcdA) into the host cytosol (By similarity). Targets colonic epithelia by binding to some receptor, and enters host cells via clathrin-mediated endocytosis (By similarity). Binding to LDLR, as well as carbohydrates and sulfated glycosaminoglycans on host cell surface contribute to entry into cells (PubMed:1670930, PubMed:31160825, PubMed:16622409). In contrast to TcdB, Frizzled receptors FZD1, FZD2 and FZD7 do not act as host receptors in the colonic epithelium for TcdA (PubMed:27680706). Once entered into host cells, acidification in the endosome promotes the membrane insertion of the translocation region and formation of a pore, leading to translocation of the GT44 and peptidase C80 domains across the endosomal membrane (By similarity). This activates the peptidase C80 domain and autocatalytic processing, releasing the N-terminal part (Glucosyltransferase TcdA), which constitutes the active part of the toxin, in the cytosol (PubMed:17334356, PubMed:19553670, PubMed:27571750).[UniProtKB:P18177]<ref>PMID:16622409</ref> <ref>PMID:1670930</ref> <ref>PMID:17334356</ref> <ref>PMID:19252482</ref> <ref>PMID:19553670</ref> <ref>PMID:20844489</ref> <ref>PMID:27571750</ref> <ref>PMID:27680706</ref> <ref>PMID:31160825</ref>   Active form of the toxin, which is released into the host cytosol following autoprocessing and inactivates small GTPases (PubMed:7775453, PubMed:24905543, PubMed:30622517, PubMed:22747490, PubMed:22267739). Acts by mediating monoglucosylation of small GTPases of the Rho family (Rac1, RhoA, RhoB, RhoC, Rap2A and Cdc42) in host cells at the conserved threonine residue located in the switch I region ('Thr-37/35'), using UDP-alpha-D-glucose as the sugar donor (PubMed:7775453, PubMed:24905543, PubMed:30622517, PubMed:22747490, PubMed:22267739). Monoglucosylation of host small GTPases completely prevents the recognition of the downstream effector, blocking the GTPases in their inactive form, leading to actin cytoskeleton disruption and cell death, resulting in the loss of colonic epithelial barrier function (PubMed:7775453). Also able to catalyze monoglucosylation of some members of the Ras family (H-Ras/HRAS, K-Ras/KRAS and N-Ras/NRAS), but with much less efficiency than with Rho proteins, suggesting that it does not act on Ras proteins in vivo (PubMed:30622517).<ref>PMID:22267739</ref> <ref>PMID:22747490</ref> <ref>PMID:24905543</ref> <ref>PMID:30622517</ref> <ref>PMID:7775453</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 21: / Line 22: @@
 __TOC__
 </StructureSection>
-[[Category: Chandrasekaran, R]]
+[[Category: Clostridioides difficile]]
-[[Category: Jin, X]]
+[[Category: Homo sapiens]]
-[[Category: Kroh, H K]]
+[[Category: Large Structures]]
-[[Category: Lacy, D B]]
+[[Category: Chandrasekaran R]]
-[[Category: Nyborg, A C]]
+[[Category: Jin X]]
-[[Category: Ohi, M D]]
+[[Category: Kroh HK]]
-[[Category: Rainey, G J]]
+[[Category: Lacy DB]]
-[[Category: Rosenthal, K]]
+[[Category: Nyborg AC]]
-[[Category: Spiller, B W]]
+[[Category: Ohi MD]]
-[[Category: Warrener, P]]
+[[Category: Rainey GJ]]
-[[Category: Woods, R]]
+[[Category: Rosenthal K]]
-[[Category: Toxin antibody]]
+[[Category: Spiller BW]]
-[[Category: Toxin-immune system complex]]
+[[Category: Warrener P]]
+[[Category: Woods R]]

5umi

From Proteopedia

Current revision

Clostridium difficile TcdA-CROPs bound to PA50 Fab

Structural highlights

Function

Publication Abstract from PubMed

References

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