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Nguyen TTH, O'Brien CJ, Tran MLN, Olson SH, Settineri NS, Prusiner SB, Paras NA, Conrad J. Water-Soluble Iridium Photoredox Catalyst for the Trifluoromethylation of Biomolecule Substrates in Phosphate Buffered Saline Solvent. Org Lett 2021; 23:3823-3827. [PMID: 33929208 DOI: 10.1021/acs.orglett.1c00871] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The development of a water-soluble iridium catalyst enables the trifluoromethylation of polar small molecules and peptides in DMSO solution or aqueous media. The reaction was optimized in a microtiter plate format under ambient air, using commercial Langlois reagent as a CF3 radical source, blue LEDs for excitation, and using DPBS as solvent to provide up to 60% CF3- peptide.
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Affiliation(s)
- Terrence-Thang H Nguyen
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Connor J O'Brien
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Minh L N Tran
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Steven H Olson
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States.,Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Nicholas S Settineri
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
| | - Stanley B Prusiner
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States.,Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States.,Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California 94158, United States
| | - Nick A Paras
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States.,Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Jay Conrad
- Institute for Neurodegenerative Diseases (IND), Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States.,Department of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
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Zhang Z, Ortega D, Rush A, Blankenship LR, Cheng ZJ, Moore RE, Tran MLN, Sandoval LG, Aboulhosn K, Watanabe S, Cortez KS, Perlman DH, Semmelhack MF, Miller Conrad LC. Antibiotic Adjuvant Activity Revealed in a Photoaffinity Approach to Determine the Molecular Target of Antipyocyanin Compounds. ACS Infect Dis 2021; 7:535-543. [PMID: 33587590 DOI: 10.1021/acsinfecdis.0c00160] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Infections with Pseudomonas aeruginosa are a looming threat to public health. New treatment strategies are needed to combat this pathogen, for example, by blocking the production of virulence factors like pyocyanin. A photoaffinity analogue of an antipyocyanin compound was developed to interrogate the inhibitor's molecular mechanism of action. While we sought to develop antivirulence inhibitors, the proteomics results suggested that the compounds had antibiotic adjuvant activity. Unexpectedly, we found that these compounds amplify the bactericidal activity of colistin, a well-characterized antibiotic, suggesting they may represent a first-in-class antibiotic adjuvant therapy. Analogues have the potential not only to widen the therapeutic index of cationic antimicrobial peptides like colistin, but also to be effective against colistin-resistant strains, strengthening our arsenal to combat P. aeruginosa infections.
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Affiliation(s)
- Zinan Zhang
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08544, United States
| | - Dominic Ortega
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Anthony Rush
- Department of Bioengineering, Stanford University, 443 Via Ortega, Stanford, California 94305, United States
| | - Lauren R. Blankenship
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Zi Jun Cheng
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Rebecca E. Moore
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Minh L. N. Tran
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Lucero G. Sandoval
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Kareem Aboulhosn
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Seiichiro Watanabe
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - Kendra S. Cortez
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
| | - David H. Perlman
- Princeton Proteomics and Mass Spectrometry Center, Princeton University, Washington Road, Princeton, New Jersey 08544, United States
| | - Martin F. Semmelhack
- Department of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08544, United States
| | - Laura C. Miller Conrad
- Department of Chemistry, San José State University, 1 Washington Square, San Jose, California 95192, United States
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Chaparian RR, Tran MLN, Miller Conrad LC, Rusch DB, van Kessel JC. Global H-NS counter-silencing by LuxR activates quorum sensing gene expression. Nucleic Acids Res 2020; 48:171-183. [PMID: 31745565 PMCID: PMC7145609 DOI: 10.1093/nar/gkz1089] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 10/15/2019] [Accepted: 11/18/2019] [Indexed: 01/03/2023] Open
Abstract
Bacteria coordinate cellular behaviors using a cell-cell communication system termed quorum sensing. In Vibrio harveyi, the master quorum sensing transcription factor LuxR directly regulates >100 genes in response to changes in population density. Here, we show that LuxR derepresses quorum sensing loci by competing with H-NS, a global transcriptional repressor that oligomerizes on DNA to form filaments and bridges. We first identified H-NS as a repressor of bioluminescence gene expression, for which LuxR is a required activator. In an hns deletion strain, LuxR is no longer necessary for transcription activation of the bioluminescence genes, suggesting that the primary role of LuxR is to displace H-NS to derepress gene expression. Using RNA-seq and ChIP-seq, we determined that H-NS and LuxR co-regulate and co-occupy 28 promoters driving expression of 63 genes across the genome. ChIP-PCR assays show that as autoinducer concentration increases, LuxR protein accumulates at co-occupied promoters while H-NS protein disperses. LuxR is sufficient to evict H-NS from promoter DNA in vitro, which is dependent on LuxR DNA binding activity. From these findings, we propose a model in which LuxR serves as a counter-silencer at H-NS-repressed quorum sensing loci by disrupting H-NS nucleoprotein complexes that block transcription.
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Affiliation(s)
| | - Minh L N Tran
- Department of Chemistry, San Jose State University, San Jose, CA, USA
| | | | - Douglas B Rusch
- Center for Genomics and Bioinformatics, Indiana University, Bloomington, IN, USA
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