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Lindgren C, Tyagi M, Viljanen J, Toms J, Ge C, Zhang N, Holmdahl R, Kihlberg J, Linusson A. Dynamics Determine Signaling in a Multicomponent System Associated with Rheumatoid Arthritis. J Med Chem 2018; 61:4774-4790. [PMID: 29727183 DOI: 10.1021/acs.jmedchem.7b01880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Strategies that target multiple components are usually required for treatment of diseases originating from complex biological systems. The multicomponent system consisting of the DR4 major histocompatibility complex type II molecule, the glycopeptide CII259-273 from type II collagen, and a T-cell receptor is associated with development of rheumatoid arthritis (RA). We introduced non-native amino acids and amide bond isosteres into CII259-273 and investigated the effect on binding to DR4 and the subsequent T-cell response. Molecular dynamics simulations revealed that complexes between DR4 and derivatives of CII259-273 were highly dynamic. Signaling in the overall multicomponent system was found to depend on formation of an appropriate number of dynamic intramolecular hydrogen bonds between DR4 and CII259-273, together with the positioning of the galactose moiety of CII259-273 in the DR4 binding groove. Interestingly, the system tolerated modifications at several positions in CII259-273, indicating opportunities to use analogues to increase our understanding of how rheumatoid arthritis develops and for evaluation as vaccines to treat RA.
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Affiliation(s)
- Cecilia Lindgren
- Department of Chemistry , Umeå University , SE-901 87 Umeå , Sweden
| | - Mohit Tyagi
- Department of Chemistry-BMC , Uppsala University , Box 576, SE-751 23 Uppsala , Sweden
| | - Johan Viljanen
- Department of Chemistry-BMC , Uppsala University , Box 576, SE-751 23 Uppsala , Sweden
| | - Johannes Toms
- Department of Chemistry-BMC , Uppsala University , Box 576, SE-751 23 Uppsala , Sweden
| | - Changrong Ge
- Medical Inflammation Research, Department of Medical Biochemistry and Biophysics , Karolinska Institute , SE-171 77 Stockholm , Sweden
| | - Naru Zhang
- Medical Inflammation Research, Department of Medical Biochemistry and Biophysics , Karolinska Institute , SE-171 77 Stockholm , Sweden.,School of Pharmaceutical Science , Southern Medical University , Guangzhou , China
| | - Rikard Holmdahl
- Medical Inflammation Research, Department of Medical Biochemistry and Biophysics , Karolinska Institute , SE-171 77 Stockholm , Sweden.,School of Pharmaceutical Science , Southern Medical University , Guangzhou , China
| | - Jan Kihlberg
- Department of Chemistry-BMC , Uppsala University , Box 576, SE-751 23 Uppsala , Sweden
| | - Anna Linusson
- Department of Chemistry , Umeå University , SE-901 87 Umeå , Sweden
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Structure-Based Drug Discovery for Botulinum Neurotoxins. Curr Top Microbiol Immunol 2012; 364:197-218. [DOI: 10.1007/978-3-642-33570-9_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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3
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Philippe C, Milcent T, Nguyen Thi Ngoc T, Crousse B, Bonnet-Delpon D. Synthesis of New Trifluoromethylated Hydroxyethylamine-Based Scaffolds. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900578] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Moe ST, Thompson AB, Smith GM, Fredenburg RA, Stein RL, Jacobson AR. Botulinum neurotoxin serotype A inhibitors: small-molecule mercaptoacetamide analogs. Bioorg Med Chem 2009; 17:3072-9. [PMID: 19329331 DOI: 10.1016/j.bmc.2009.03.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2009] [Revised: 03/05/2009] [Accepted: 03/06/2009] [Indexed: 01/14/2023]
Abstract
Botulinum neurotoxin elicits its paralytic activity through a zinc-dependant metalloprotease that cleaves proteins involved in neurotransmitter release. Currently, no drugs are available to reverse the effects of botulinum intoxication. Herein we report the design of a novel series of mercaptoacetamide small-molecule inhibitors active against botulinum neurotoxin serotype A. These analogs show low micromolar inhibitory activity against the isolated enzyme. Structure-activity relationship studies for a series of mercaptoacetamide analogs of 5-amino-3-phenylpyrazole reveal components essential for potent inhibitory activity.
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Affiliation(s)
- Scott T Moe
- Absolute Science, Inc., Lexington, MA 02421, United States
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Brunger AT, Rummel A. Receptor and substrate interactions of clostridial neurotoxins. Toxicon 2009; 54:550-60. [PMID: 19268493 PMCID: PMC2756235 DOI: 10.1016/j.toxicon.2008.12.027] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2008] [Revised: 12/01/2008] [Accepted: 12/02/2008] [Indexed: 01/27/2023]
Abstract
The high potency of clostridial neurotoxins relies predominantly on their neurospecific binding and specific hydrolysis of SNARE proteins. Their multi-step mode of mechanism can be ascribed to their multi-domain three-dimensional structure. The C-terminal H(CC)-domain interacts subsequently with complex polysialo-gangliosides such as GT1b and a synaptic vesicle protein receptor via two neighbouring binding sites, resulting in highly specific uptake of the neurotoxins at synapses of cholinergic motoneurons. After its translocation the enzymatically active light chain specifically hydrolyses specific SNARE proteins, preventing SNARE complex assembly and thereby blocking exocytosis of neurotransmitter.
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Affiliation(s)
- Axel T Brunger
- The Howard Hughes Medical Institute and Departments of Molecular and Cellular Physiology, Neurology and Neurological Sciences, Structural Biology, and Photon Science, Stanford University, J.H. Clark Center, E300C, 318 Campus Drive, Stanford, CA 94305, USA.
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Philippe C, Milcent T, Crousse B, Bonnet-Delpon D. Non Lewis acid catalysed epoxide ring opening with amino acid esters. Org Biomol Chem 2009; 7:2026-8. [DOI: 10.1039/b902081k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Willis B, Eubanks LM, Dickerson TJ, Janda KD. The strange case of the botulinum neurotoxin: using chemistry and biology to modulate the most deadly poison. Angew Chem Int Ed Engl 2008; 47:8360-79. [PMID: 18844202 DOI: 10.1002/anie.200705531] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In the classic novella "The Strange Case of Dr. Jekyll and Mr. Hyde", Robert Louis Stevenson paints a stark picture of the duality of good and evil within a single man. Botulinum neurotoxin (BoNT), the most potent known toxin, possesses an analogous dichotomous nature: It shows a pronounced morbidity and mortality, but it is used with great effect in much lower doses in a wide range of clinical scenarios. Recently, tremendous strides have been made in the basic understanding of the structure and function of BoNT, which have translated into widespread efforts towards the discovery of biomacromolecules and small molecules that specifically modulate BoNT activity. Particular emphasis has been placed on the identification of inhibitors that can counteract BoNT exposure in the event of a bioterrorist attack. This Review summarizes the current advances in the development of therapeutics, including vaccines, peptides, and small-molecule inhibitors, for the prevention and treatment of botulism.
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Affiliation(s)
- Bert Willis
- Department of Chemistry, Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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Willis B, Eubanks L, Dickerson T, Janda K. Der seltsame Fall des Botulinum-Neurotoxins: chemische und biologische Modulierung des tödlichsten aller Gifte. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200705531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Antimicrobial Peptides: New Recognition Molecules for Detecting Botulinum Toxins. SENSORS 2007; 7:2808-2824. [PMID: 28903262 PMCID: PMC3965214 DOI: 10.3390/s7112808] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Accepted: 11/14/2007] [Indexed: 11/20/2022]
Abstract
Many organisms secrete antimicrobial peptides (AMPs) for protection against harmful microbes. The present study describes detection of botulinum neurotoxoids A, B and E using AMPs as recognition elements in an array biosensor. While AMP affinities were similar to those for anti-botulinum antibodies, differences in binding patterns were observed and can potentially be used for identification of toxoid serotype. Furthermore, some AMPs also demonstrated superior detection sensitivity compared to antibodies: toxoid A could be detected at 3.5 LD50 of the active toxin in a 75-min assay, whereas toxoids B and E were detected at 14 and 80 LD50 for their respective toxins.
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Fang H, Luo W, Henkel J, Barbieri J, Green N. A yeast assay probes the interaction between botulinum neurotoxin serotype B and its SNARE substrate. Proc Natl Acad Sci U S A 2006; 103:6958-63. [PMID: 16636286 PMCID: PMC1447522 DOI: 10.1073/pnas.0510816103] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The seven functionally distinct serotypes (A-G) of botulinum neurotoxin (BoNT) are dichains consisting of light chain (LC) with zinc-dependent endoprotease activity connected by one disulfide bond to heavy chain with neuronal-cell translocation and receptor-binding domains. LC-mediated proteolysis of soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins and consequent inhibition of synaptic vesicle fusion to the presynaptic membrane of human motor neurons are responsible for flaccid paralysis associated with botulism. LC endoproteolysis is complex, requiring highly extended SNARE sequences at the surface of intracellular membranes and prompting our development of a genetically amenable assay to monitor the interaction between BoNT/LC and its SNARE substrate. Using BoNT serotype B as a model, the assay employs a chimeric SNARE protein where a portion of neuronal synaptobrevin (Sb) is fused to Snc2p, a Sb ortholog required for protein secretion from yeast cells. Regulated expression of serotype B-LC in yeast leads to cleavage of the chimera and a conditional growth defect. To assess utility of this assay for monitoring SNARE protein cleavage, we growth-selected chimeric SNARE mutations that inhibited proteolysis. When these mutations were introduced into Sb and examined for cleavage, substrate residues located near and distal to the cleavage site were important, including residues positioned near the Sb transmembrane domain, an unexplored aspect of BoNT cell intoxication. Additional mutations were positioned in a nine-residue SNARE motif, supporting a previously assigned role for this motif in LC recognition and providing proof of principle for the application of yeast-based technology to study intracellular BoNT/LC endoproteases.
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Affiliation(s)
- Hong Fang
- Department of Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, TN 37232-2363, USA.
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Breidenbach MA, Brunger AT. New insights into clostridial neurotoxin-SNARE interactions. Trends Mol Med 2005; 11:377-81. [PMID: 16006188 DOI: 10.1016/j.molmed.2005.06.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Revised: 06/10/2005] [Accepted: 06/27/2005] [Indexed: 11/29/2022]
Abstract
Botulinum neurotoxin serotype A (BoNT/A) has achieved a dichotomous status in modern medicine; it is both a versatile treatment for several neurological disorders and a lethal poison responsible for causing the neuroparalytic syndrome botulism. The extent of paralysis largely depends on the dosage of toxin received. The toxins block neurotransmitter release by delivering their Zn(2+)-dependent protease components to the presynaptic side of chemical synapses. These highly specialized enzymes exclusively hydrolyze peptide bonds within SNARE (soluble N-ethylmaleiamide-sensitive factor attachment protein receptor) proteins. Recently, the structural basis for the highly specific interaction between BoNT/A and its target SNARE, SNAP-25 (synaptosomal-associated protein of 25kDa), was elucidated. New details regarding the nature of the toxin-SNARE interactions could be exploited for novel inhibitor design.
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Affiliation(s)
- Mark A Breidenbach
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, CA 94305, USA
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Haug BE, Brewer M, Rich DH. Facile degradative lactonization of Gln-Arg and Gln-Phe hydroxyethylene dipeptide derivatives. THE JOURNAL OF PEPTIDE RESEARCH : OFFICIAL JOURNAL OF THE AMERICAN PEPTIDE SOCIETY 2005; 65:77-83. [PMID: 15759328 DOI: 10.1111/j.1399-3011.2004.00208.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
We have found that hydroxyrthylene (HE) dipeptide analogs of Gln-Arg and Gln-Phe are usually susceptible to acid catalyzed lactonization. The synthesis of substrate-based transition state analog inhibitors of botulinum neurotoxin metalloprotease inhibitors that contain the Gln-Arg or the Gln-Phe HE units is complicated by this facile degradative lactonization.
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Affiliation(s)
- B E Haug
- School of Pharmacy and Department of Chemistry, University of Wisconsin-Madison, USA
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Abstract
[structure: see text] The protected Gln-Phe hydroxyethylene dipeptide isostere 1 was synthesized as a precursor for preparation of potential inhibitors of Botulinum neurotoxin B metalloprotease. The method allows for the synthesis of additional hydroxyethylene dipeptide isosteres such as 2 with functionalized P1 side chains. The isosteres prepared were coupled with a dipeptide to produce protected pseudotetrapeptide derivatives.
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Affiliation(s)
- Bengt Erik Haug
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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