1
|
Shapiro J, Post SJ, Smith GC, Wuest WM. Total Synthesis of the Reported Structure of Cahuitamycin A: Insights into an Elusive Natural Product Scaffold. Org Lett 2023; 25:9243-9248. [PMID: 38155597 PMCID: PMC10758118 DOI: 10.1021/acs.orglett.3c03993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/13/2023] [Accepted: 12/13/2023] [Indexed: 12/30/2023]
Abstract
In a 2016 screen of natural product extracts, a new family of natural products, the cahuitamycins, was discovered and found to inhibit biofilm formation in the human pathogen Acinetobacter baumannii. The proposed molecular structures contained an unusual piperazic acid residue, which piqued interest related to their structure/function and biosynthesis. Herein we disclose the first total synthesis of the proposed structure of cahuitamycin A in a 12-step longest linear sequence and 18% overall yield. Comparison of spectral and biological data of the authentic natural product and synthetic compound revealed inconsistentancies with the isolated metabolite. We therefore executed the diverted total synthesis of three isomeric compounds, which were also found to be disparate from the isolated natural product. This work sets the stage for future synthetic and biochemical investigations of an important class of natural products.
Collapse
Affiliation(s)
- Justin
A. Shapiro
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Savannah J. Post
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Gavin C. Smith
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - William M. Wuest
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
- Emory
Antibiotic Resistance Center, Emory University, Atlanta, Georgia 30322, United States
| |
Collapse
|
2
|
Golden M, Post SJ, Rivera R, Wuest WM. Investigating the Role of Metabolism for Antibiotic Combination Therapies in Pseudomonas aeruginosa. ACS Infect Dis 2023; 9:2386-2393. [PMID: 37938982 PMCID: PMC10714402 DOI: 10.1021/acsinfecdis.3c00452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/01/2023] [Accepted: 11/02/2023] [Indexed: 11/10/2023]
Abstract
Antibacterial resistance poses a severe threat to public health; an anticipated 14-fold increase in multidrug-resistant (MDR) bacterial infections is expected to occur by 2050. Contrary to antibiotics, combination therapies are the standard of care for antiviral and anticancer treatments, as synergistic drug-drug interactions can decrease dosage and resistance development. In this study, we investigated combination treatments of a novel succinate dehydrogenase inhibitor (promysalin) with specific inhibitors of metabolism and efflux alongside a panel of clinically approved antibiotics in synergy studies. Through these investigations, we determined that promysalin can work synergistically with vancomycin and antagonistically with aminoglycosides and a glyoxylate shunt pathway inhibitor at subinhibitory concentrations; however, these cooperative effects do not reduce minimum inhibitory concentrations. The variability of these results underscores the complexity of targeting metabolism for combination therapies in antibiotic development.
Collapse
Affiliation(s)
- Martina
M. Golden
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Savannah J. Post
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Renata Rivera
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - William M. Wuest
- Department
of Chemistry, Emory University, Atlanta, Georgia 30322, United States
- Emory
Antibiotic Resistance Center, Emory School of Medicine, Emory University, Atlanta, Georgia 30322, United States
| |
Collapse
|
3
|
Michaud ME, Allen RA, Morrison-Lewis KR, Sanchez CA, Minbiole KPC, Post SJ, Wuest WM. Quaternary Phosphonium Compound Unveiled as a Potent Disinfectant against Highly Resistant Acinetobacter baumannii Clinical Isolates. ACS Infect Dis 2022; 8:2307-2314. [PMID: 36301313 DOI: 10.1021/acsinfecdis.2c00382] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Acinetobacter baumannii is classified as a highest threat pathogen, urgently necessitating novel antimicrobials that evade resistance to combat its spread. Quaternary ammonium compounds (QACs) have afforded a valuable first line of defense against antimicrobial resistant pathogens as broad-spectrum amphiphilic disinfectant molecules. However, a paucity of innovation in this space has driven the emergence of QAC resistance. Through this work, we sought to identify next-generation disinfectant molecules with efficacy against highly resistant A. baumannii clinical isolates. We selected 12 best-in-class molecules from our previous investigations of quaternary ammonium and quaternary phosphonium compounds (QPCs) to test against a panel of 35 resistant A. baumannii clinical isolates. The results highlighted the efficacy of our next-generation compounds over leading commercial QACs, with our best-in-class QAC (2Pyr-11,11) and QPC (P6P-10,10) displaying improved activities with a few exceptions. Furthermore, we elucidated a correlation between colistin resistance and QAC resistance, wherein the only pan-resistant isolate of the panel, also harboring colistin resistance, exhibited resistance to all tested QACs. Notably, P6P-10,10 maintained efficacy against this strain with an IC90 of 3 μM. In addition, P6P-10,10 displayed minimum biofilm eradication concentrations as low as 32 μM against extensively drug resistant clinical isolates. Lastly, examining the development of disinfectant resistance and cross-resistance, we generated QAC-resistant A. baumannii mutants and observed the development of QAC cross-resistance. In contrast, neither disinfectant resistance nor cross-resistance was observed in A. baumannii under P6P-10,10 treatment. Taken together, the results of this work illustrate the need for novel disinfectant compounds to treat resistant pathogens, such as A. baumannii, and underscore the promise of QPCs, such as P6P-10,10, as viable next-generation disinfectant molecules.
Collapse
Affiliation(s)
- Marina E Michaud
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Ryan A Allen
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | | | - Christian A Sanchez
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Kevin P C Minbiole
- Department of Chemistry, Villanova University, Villanova, Pennsylvania 19085, United States
| | - Savannah J Post
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - William M Wuest
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States.,Emory Antibiotic Resistance Center, Emory University School of Medicine, Atlanta, Georgia 30322, United States
| |
Collapse
|
4
|
Post SJ, Keohane CE, Rossiter LM, Kaplan AR, Khowsathit J, Matuska K, Karanicolas J, Wuest WM. Correction to “Target-Based Design of Promysalin Analogs Identifies a New Putative Binding Cleft in Succinate Dehydrogenase”. ACS Infect Dis 2022; 8:1376. [DOI: 10.1021/acsinfecdis.2c00256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
5
|
Jolly CS, Kochanowski E, Dodd CJ, Post SJ, Hill HM, Turlington M. Diastereoselective Synthesis of Terminal Bromo-Substituted Propargylamines via Generation of Lithium Bromoacetylide and Addition to Chiral N- tert-Butanesulfinyl Aldimines. J Org Chem 2021; 86:2667-2681. [PMID: 33448846 DOI: 10.1021/acs.joc.0c02697] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The stereoselective synthesis of terminal bromo-substituted propargylamines via in situ generation of lithium bromoacetylide from 1,2-dibromoethene and addition to Ellman chiral N-tert-butanesulfinyl aldimines is reported. Modest to good yields (43-85%) and diastereoselectivity (dr = 3:1 to >20:1) were achieved for a range of aryl, heteroaryl, alkyl, and α,β-unsaturated substrates. Terminal bromo-substituted propargylamines prepared via this method can be directly used in the frequently employed Cadiot-Chodkiewicz coupling to produce functionalized diynes. The method reported here increases the structural diversity of chiral terminal bromo-substituted propargylamines that can be readily synthesized as previous methods for the stereoselective synthesis of these compounds rely on amino acid precursors from the chiral pool.
Collapse
Affiliation(s)
- Charles S Jolly
- Department of Chemistry & Biochemistry, Berry College, Mount Berry, Georgia 30149, United States
| | - Emma Kochanowski
- Department of Chemistry & Biochemistry, Berry College, Mount Berry, Georgia 30149, United States
| | - Cayden J Dodd
- Department of Chemistry & Biochemistry, Berry College, Mount Berry, Georgia 30149, United States
| | - Savannah J Post
- Department of Chemistry & Biochemistry, Berry College, Mount Berry, Georgia 30149, United States
| | - Harrison M Hill
- Department of Chemistry & Biochemistry, Berry College, Mount Berry, Georgia 30149, United States
| | - Mark Turlington
- Department of Chemistry & Biochemistry, Berry College, Mount Berry, Georgia 30149, United States
| |
Collapse
|
6
|
Sommers KJ, Bentley BS, Carden RG, Post SJ, Allen RA, Kontos RC, Black JW, Wuest WM, Minbiole KPC. Metallocene QACs: The Incorporation of Ferrocene Moieties into monoQAC and bisQAC Structures. ChemMedChem 2020; 16:467-471. [PMID: 33197298 DOI: 10.1002/cmdc.202000605] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 11/12/2020] [Indexed: 01/12/2023]
Abstract
Inspired by the incorporation of metallocene functionalities into a variety of bioactive structures, particularly antimicrobial peptides, we endeavored to broaden the structural variety of quaternary ammonium compounds (QACs) by the incorporation of the ferrocene moiety. Accordingly, 23 ferrocene-containing mono- and bisQACs were prepared in high yields and tested for activity against a variety of bacteria, including Gram-negative strains and a panel of clinically isolated MRSA strains. Ferrocene QACs were shown to be effective antiseptics with some displaying single-digit micromolar activity against all bacteria tested, demonstrating yet another step in the expansion of structural variety of antiseptic QACs.
Collapse
Affiliation(s)
- Kyle J Sommers
- Department of Chemistry, Villanova University, Villanova, PA 19085, USA
| | - Brian S Bentley
- Department of Chemistry, Villanova University, Villanova, PA 19085, USA
| | - Robert G Carden
- Department of Chemistry, Villanova University, Villanova, PA 19085, USA
| | - Savannah J Post
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
| | - Ryan A Allen
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
| | - Renee C Kontos
- Department of Chemistry, Villanova University, Villanova, PA 19085, USA
| | - Jacob W Black
- Department of Chemistry, Villanova University, Villanova, PA 19085, USA
| | - William M Wuest
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
| | | |
Collapse
|
7
|
Post SJ, Keohane CE, Rossiter LM, Kaplan AR, Khowsathit J, Matuska K, Karanicolas J, Wuest WM. Target-Based Design of Promysalin Analogues Identifies a New Putative Binding Cleft in Succinate Dehydrogenase. ACS Infect Dis 2020; 6:1372-1377. [PMID: 32286041 PMCID: PMC7293565 DOI: 10.1021/acsinfecdis.0c00024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Promysalin is a small-molecule natural product that specifically inhibits growth of the Gram-negative pathogen Pseudomonas aeruginosa (PA). This activity holds promise in the treatment of multidrug resistant infections found in immunocompromised patients with chronic illnesses, such as cystic fibrosis. In 2015, our lab completed the first total synthesis; subsequent analogue design and SAR investigation enabled identification of succinate dehydrogenase (Sdh) as the biological target in PA. Herein, we report the target-guided design of new promysalin analogues with varying alkyl chains, one of which is on par with our most potent analogue to date. Computational docking revealed that some analogues have a different orientation in the Sdh binding pocket, placing the terminal carbon proximal to a tryptophan residue. This inspired the design of an extended side chain analogue bearing a terminal phenyl moiety, providing a basis for the design of future analogues.
Collapse
Affiliation(s)
- Savannah J Post
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Colleen E Keohane
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Lauren M Rossiter
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Anna R Kaplan
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Jittasak Khowsathit
- Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, United States
| | - Katie Matuska
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - John Karanicolas
- Molecular Therapeutics Program, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, United States
| | - William M Wuest
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
- Emory Antibiotic Resistance Center, Emory School of Medicine, Emory University, Atlanta, Georgia 30322, United States
| |
Collapse
|
8
|
Post SJ, Shapiro JA, Wuest WM. Connecting iron acquisition and biofilm formation in the ESKAPE pathogens as a strategy for combatting antibiotic resistance. Medchemcomm 2019; 10:505-512. [PMID: 31057729 PMCID: PMC6482887 DOI: 10.1039/c9md00032a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 03/20/2019] [Indexed: 12/24/2022]
Abstract
The rise of antibiotic resistant bacteria has become a problem of global concern. Of particular interest are the ESKAPE pathogens, species with high rates of multi-drug resistant infections. Novel antibiotic mechanisms of action are necessary to compliment traditional therapeutics. Recent research has focused on targeting virulence factors as a method of combatting infection without creating selective pressure for resistance or damaging the host commensal microbiome. Some investigations into one such virulence behavior, iron acquisition, have displayed additional effects on another virulence behavior, biofilm formation. The use of exogenous iron-chelators, gallium as an iron mimic, and inhibition of siderophore-mediated iron acquisition are all strategies for disturbing iron-homeostasis that have implicated effects on biofilms. However, the exact nature of this connection remains ambiguous. Herein we summarize these findings and identify opportunities for further investigation.
Collapse
Affiliation(s)
- Savannah J Post
- Department of Chemistry , Emory University , Atlanta , GA 30322 , USA .
| | - Justin A Shapiro
- Department of Chemistry , Emory University , Atlanta , GA 30322 , USA .
| | - William M Wuest
- Department of Chemistry , Emory University , Atlanta , GA 30322 , USA .
- Antibiotic Resistance Center , Emory University School of Medicine , Atlanta , GA 30322 , USA
| |
Collapse
|
9
|
Doiron JE, Le CA, Ody BK, Brace JB, Post SJ, Thacker NL, Hill HM, Breton GW, Mulder MJ, Chang S, Bridges TM, Tang L, Wang W, Rowe SM, Aller SG, Turlington M. Evaluation of 1,2,3-Triazoles as Amide Bioisosteres In Cystic Fibrosis Transmembrane Conductance Regulator Modulators VX-770 and VX-809. Chemistry 2019; 25:3662-3674. [PMID: 30650214 PMCID: PMC6469399 DOI: 10.1002/chem.201805919] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 01/14/2019] [Indexed: 12/25/2022]
Abstract
The 1,2,3-triazole has been successfully utilized as an amide bioisostere in multiple therapeutic contexts. Based on this precedent, triazole analogues derived from VX-809 and VX-770, prominent amide-containing modulators of the cystic fibrosis transmembrane conductance regulator (CFTR), were synthesized and evaluated for CFTR modulation. Triazole 11, derived from VX-809, displayed markedly reduced efficacy in F508del-CFTR correction in cellular TECC assays in comparison to VX-809. Surprisingly, triazole analogues derived from potentiator VX-770 displayed no potentiation of F508del, G551D, or WT-CFTR in cellular Ussing chamber assays. However, patch clamp analysis revealed that triazole 60 potentiates WT-CFTR similarly to VX-770. The efficacy of 60 in the cell-free patch clamp experiment suggests that the loss of activity in the cellular assay could be due to the inability of VX-770 triazole derivatives to reach the CFTR binding site. Moreover, in addition to the negative impact on biological activity, triazoles in both structural classes displayed decreased metabolic stability in human microsomes relative to the analogous amides. In contrast to the many studies that demonstrate the advantages of using the 1,2,3-triazole, these findings highlight the negative impacts that can arise from replacement of the amide with the triazole and suggest that caution is warranted when considering use of the 1,2,3-triazole as an amide bioisostere.
Collapse
Affiliation(s)
- Jake E. Doiron
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Christina A. Le
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA),
| | - Britton K. Ody
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Jonathon B. Brace
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Savannah J. Post
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Nathan L. Thacker
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Harrison M. Hill
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Gary W. Breton
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| | - Matthew J. Mulder
- Vanderbilt Center for Neuroscience Drug Discovery, Nashville, Tennessee 37232 (USA)
| | - Sichen Chang
- Vanderbilt Center for Neuroscience Drug Discovery, Nashville, Tennessee 37232 (USA)
| | - Thomas M. Bridges
- Vanderbilt Center for Neuroscience Drug Discovery, Nashville, Tennessee 37232 (USA)
| | - Liping Tang
- Departments of Medicine and Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
| | - Wei Wang
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
| | - Steven M. Rowe
- Departments of Medicine and Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
- Department of Cell, Development, and Integrative Biology, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA)
| | - Stephen G. Aller
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, Alabama 35205 (USA),
| | - Mark Turlington
- Department of Chemistry and Biochemistry, Berry College, Mount Berry, Georgia 30165 (USA),
| |
Collapse
|