1
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Guy CS, Gott JA, Ramírez-Cárdenas J, de Wolf C, Furze CM, West G, Muñoz-García JC, Angulo J, Fullam E. Fluorinated trehalose analogues for cell surface engineering and imaging of Mycobacterium tuberculosis. Chem Sci 2024:d4sc00721b. [PMID: 39144457 PMCID: PMC11317875 DOI: 10.1039/d4sc00721b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 06/13/2024] [Indexed: 08/16/2024] Open
Abstract
The sensitive, rapid and accurate diagnosis of Mycobacterium tuberculosis (Mtb) infection is a central challenge in controlling the global tuberculosis (TB) pandemic. Yet the detection of mycobacteria is often made difficult by the low sensitivity of current diagnostic tools, with over 3.6 million TB cases missed each year. To overcome these limitations there is an urgent need for next-generation TB diagnostic technologies. Here we report the use of a discrete panel of native 19F-trehalose (F-Tre) analogues to label and directly visualise Mtb by exploiting the uptake of fluorine-modified trehalose analogues via the mycobacterial trehalose LpqY-SugABC ATP-binding cassette (ABC) importer. We discovered the extent of modified F-Tre uptake correlates with LpqY substrate recognition and characterisation of the interacting sites by saturation transfer difference NMR coupled with molecular dynamics provides a unique glimpse into the molecular basis of fluorine-modified trehalose import in Mtb. Lipid profiling demonstrated that F-Tre analogues modified at positions 2, 3 and 6 are incorporated into mycobacterial cell-surface trehalose-containing glycolipids. This rapid one-step labelling approach facilitates the direct visualisation of F-Tre-labelled Mtb by Focused Ion Beam (FIB) Secondary Ion Mass Spectrometry (SIMS), enabling detection of the Mtb pathogen. Collectively, our findings highlight that F-Tre analogues have potential as tools to probe and unravel Mtb biology and can be exploited to detect and image TB.
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Affiliation(s)
- Collette S Guy
- School of Life Sciences, University of Warwick Coventry CV4 7AL UK +44 (0)2476 574239
| | | | - Jonathan Ramírez-Cárdenas
- Instituto de Investigaciones Químicas (IIQ), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla Avenida Américo Vespucio, 49 Sevilla 41092 Spain
| | - Christopher de Wolf
- School of Life Sciences, University of Warwick Coventry CV4 7AL UK +44 (0)2476 574239
| | - Christopher M Furze
- School of Life Sciences, University of Warwick Coventry CV4 7AL UK +44 (0)2476 574239
| | - Geoff West
- WMG, University of Warwick Coventry CV4 7AL UK
| | - Juan C Muñoz-García
- Instituto de Investigaciones Químicas (IIQ), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla Avenida Américo Vespucio, 49 Sevilla 41092 Spain
| | - Jesus Angulo
- Instituto de Investigaciones Químicas (IIQ), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla Avenida Américo Vespucio, 49 Sevilla 41092 Spain
| | - Elizabeth Fullam
- School of Life Sciences, University of Warwick Coventry CV4 7AL UK +44 (0)2476 574239
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2
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Khan RMN, Ahn YM, Marriner GA, Via LE, D'Hooge F, Seo Lee S, Yang N, Basuli F, White AG, Tomko JA, Frye LJ, Scanga CA, Weiner DM, Sutphen ML, Schimel DM, Dayao E, Piazza MK, Gomez F, Dieckmann W, Herscovitch P, Mason NS, Swenson R, Kiesewetter DO, Backus KM, Geng Y, Raj R, Anthony DC, Flynn JL, Barry CE, Davis BG. Distributable, metabolic PET reporting of tuberculosis. Nat Commun 2024; 15:5239. [PMID: 38937448 PMCID: PMC11211441 DOI: 10.1038/s41467-024-48691-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 05/09/2024] [Indexed: 06/29/2024] Open
Abstract
Tuberculosis remains a large global disease burden for which treatment regimens are protracted and monitoring of disease activity difficult. Existing detection methods rely almost exclusively on bacterial culture from sputum which limits sampling to organisms on the pulmonary surface. Advances in monitoring tuberculous lesions have utilized the common glucoside [18F]FDG, yet lack specificity to the causative pathogen Mycobacterium tuberculosis (Mtb) and so do not directly correlate with pathogen viability. Here we show that a close mimic that is also positron-emitting of the non-mammalian Mtb disaccharide trehalose - 2-[18F]fluoro-2-deoxytrehalose ([18F]FDT) - is a mechanism-based reporter of Mycobacteria-selective enzyme activity in vivo. Use of [18F]FDT in the imaging of Mtb in diverse models of disease, including non-human primates, successfully co-opts Mtb-mediated processing of trehalose to allow the specific imaging of TB-associated lesions and to monitor the effects of treatment. A pyrogen-free, direct enzyme-catalyzed process for its radiochemical synthesis allows the ready production of [18F]FDT from the most globally-abundant organic 18F-containing molecule, [18F]FDG. The full, pre-clinical validation of both production method and [18F]FDT now creates a new, bacterium-selective candidate for clinical evaluation. We anticipate that this distributable technology to generate clinical-grade [18F]FDT directly from the widely-available clinical reagent [18F]FDG, without need for either custom-made radioisotope generation or specialist chemical methods and/or facilities, could now usher in global, democratized access to a TB-specific PET tracer.
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Affiliation(s)
- R M Naseer Khan
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- Clinical Pharmacology Lab, Clinical Center, NIHBC, NIH, Bethesda, MD, USA
| | - Yong-Mo Ahn
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Gwendolyn A Marriner
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Laura E Via
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
- Tuberculosis Imaging Program, DIR, NIAID, NIH, Bethesda, MD, USA
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Francois D'Hooge
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Seung Seo Lee
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- School of Chemistry, University of Southampton, Southampton, UK
| | - Nan Yang
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- The Rosalind Franklin Institute, Oxfordshire, UK
| | - Falguni Basuli
- Chemistry and Synthesis Center, NHLBI, NIH, Bethesda, MD, USA
| | - Alexander G White
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, USA
| | - Jaime A Tomko
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, USA
| | - L James Frye
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, USA
| | - Charles A Scanga
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, USA
| | - Danielle M Weiner
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Michelle L Sutphen
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Daniel M Schimel
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
| | - Emmanuel Dayao
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA
| | | | - Felipe Gomez
- Tuberculosis Imaging Program, DIR, NIAID, NIH, Bethesda, MD, USA
| | - William Dieckmann
- Positron Emission Tomography Department, Clinical Center, NIH, Bethesda, MD, USA
| | - Peter Herscovitch
- Positron Emission Tomography Department, Clinical Center, NIH, Bethesda, MD, USA
| | - N Scott Mason
- Department of Radiology, University of Pittsburgh, Pittsburgh, USA
| | - Rolf Swenson
- Chemistry and Synthesis Center, NHLBI, NIH, Bethesda, MD, USA
| | - Dale O Kiesewetter
- Molecular Tracer and Imaging Core Facility, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, MD, USA
| | - Keriann M Backus
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- Biological Chemistry Department, David Geffen School of Medicine, UCLA, Los Angeles, CA, USA
| | - Yiqun Geng
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Ritu Raj
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | | | - JoAnne L Flynn
- Department of Microbiology and Molecular Genetics, University of Pittsburgh, Pittsburgh, USA
| | - Clifton E Barry
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD, USA.
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa.
| | - Benjamin G Davis
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK.
- The Rosalind Franklin Institute, Oxfordshire, UK.
- Department of Pharmacology, University of Oxford, Oxford, UK.
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3
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Kalera K, Liu R, Lim J, Pathirage R, Swanson DH, Johnson UG, Stothard AI, Lee JJ, Poston AW, Woodruff PJ, Ronning DR, Eoh H, Swarts BM. Targeting Mycobacterium tuberculosis Persistence through Inhibition of the Trehalose Catalytic Shift. ACS Infect Dis 2024; 10:1391-1404. [PMID: 38485491 PMCID: PMC11019547 DOI: 10.1021/acsinfecdis.4c00138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 04/13/2024]
Abstract
Tuberculosis (TB), caused by Mycobacterium tuberculosis (Mtb), is the leading cause of death worldwide by infectious disease. Treatment of Mtb infection requires a six-month course of multiple antibiotics, an extremely challenging regimen necessitated by Mtb's ability to form drug-tolerant persister cells. Mtb persister formation is dependent on the trehalose catalytic shift, a stress-responsive metabolic remodeling mechanism in which the disaccharide trehalose is liberated from cell surface glycolipids and repurposed as an internal carbon source to meet energy and redox demands. Here, using a biofilm-persister model, metabolomics, and cryo-electron microscopy (EM), we found that azidodeoxy- and aminodeoxy-d-trehalose analogues block the Mtb trehalose catalytic shift through inhibition of trehalose synthase TreS (Rv0126), which catalyzes the isomerization of trehalose to maltose. Out of a focused eight-member compound panel constructed by chemoenzymatic synthesis, the natural product 2-trehalosamine exhibited the highest potency and significantly potentiated first- and second-line TB drugs in broth culture and macrophage infection assays. We also report the first structure of TreS bound to a substrate analogue inhibitor, obtained via cryo-EM, which revealed conformational changes likely essential for catalysis and inhibitor binding that can potentially be exploited for future therapeutic development. Our results demonstrate that inhibition of the trehalose catalytic shift is a viable strategy to target Mtb persisters and advance trehalose analogues as tools and potential adjunctive therapeutics for investigating and targeting mycobacterial persistence.
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Affiliation(s)
- Karishma Kalera
- Department
of Chemistry and Biochemistry, Central Michigan
University, Mount
Pleasant, Michigan 48859, United States
- Biochemistry,
Cell, and Molecular Biology Program, Central
Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Rachel Liu
- Department
of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, United States
| | - Juhyeon Lim
- Department
of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, United States
| | - Rasangi Pathirage
- Department
of Pharmaceutical Sciences, University of
Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Daniel H. Swanson
- Department
of Chemistry and Biochemistry, Central Michigan
University, Mount
Pleasant, Michigan 48859, United States
| | - Ulysses G. Johnson
- Department
of Chemistry and Biochemistry, Central Michigan
University, Mount
Pleasant, Michigan 48859, United States
- Biochemistry,
Cell, and Molecular Biology Program, Central
Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Alicyn I. Stothard
- Department
of Chemistry and Biochemistry, Central Michigan
University, Mount
Pleasant, Michigan 48859, United States
| | - Jae Jin Lee
- Department
of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, United States
| | - Anne W. Poston
- Department
of Chemistry and Biochemistry, Central Michigan
University, Mount
Pleasant, Michigan 48859, United States
| | - Peter J. Woodruff
- Department
of Chemistry, University of Southern Maine, Portland, Maine 04104, United States
| | - Donald R. Ronning
- Department
of Pharmaceutical Sciences, University of
Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Hyungjin Eoh
- Department
of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, United States
| | - Benjamin M. Swarts
- Department
of Chemistry and Biochemistry, Central Michigan
University, Mount
Pleasant, Michigan 48859, United States
- Biochemistry,
Cell, and Molecular Biology Program, Central
Michigan University, Mount Pleasant, Michigan 48859, United States
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4
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Shrestha P, Karmacharya J, Han SR, Lee JH, Oh TJ. Elucidation of bacterial trehalose-degrading trehalase and trehalose phosphorylase: physiological significance and its potential applications. Glycobiology 2024; 34:cwad084. [PMID: 37847605 PMCID: PMC10969515 DOI: 10.1093/glycob/cwad084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 10/11/2023] [Accepted: 10/11/2023] [Indexed: 10/19/2023] Open
Abstract
Bacteria possess diverse metabolic and genetic processes, resulting in the inability of certain bacteria to degrade trehalose. However, some bacteria do have the capability to degrade trehalose, utilizing it as a carbon source, and for defense against environmental stress. Trehalose, a disaccharide, serves as a carbon source for many bacteria, including some that are vital for pathogens. The degradation of trehalose is carried out by enzymes like trehalase (EC 3.2.1.28) and trehalose phosphorylase (EC 2.4.1.64/2.4.1.231), which are classified under the glycoside hydrolase families GH37, GH15, and GH65. Numerous studies and reports have explored the physiological functions, recombinant expression, enzymatic characteristics, and potential applications of these enzymes. However, further research is still being conducted to understand their roles in bacteria. This review aims to provide a comprehensive summary of the current understanding of trehalose degradation pathways in various bacteria, focusing on three key areas: (i) identifying different trehalose-degrading enzymes in Gram-positive and Gram-negative bacteria, (ii) elucidating the mechanisms employed by trehalose-degrading enzymes belonging to the glycoside hydrolases GH37, GH15, and GH65, and (iii) discussing the potential applications of these enzymes in different sectors. Notably, this review emphasizes the bacterial trehalose-degrading enzymes, specifically trehalases (GH37, GH15, and GH65) and trehalose phosphorylases (GH65), in both Gram-positive and Gram-negative bacteria, an aspect that has not been highlighted before.
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Affiliation(s)
- Prasansah Shrestha
- Department of Life Sciences and Biochemical Engineering, Graduate School, Sun Moon University, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon, Asan-si, Chungcheongnam-do, 31460, South Korea
| | - Jayram Karmacharya
- Department of Life Sciences and Biochemical Engineering, Graduate School, Sun Moon University, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon, Asan-si, Chungcheongnam-do, 31460, South Korea
| | - So-Ra Han
- Department of Life Sciences and Biochemical Engineering, Graduate School, Sun Moon University, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon, Asan-si, Chungcheongnam-do, 31460, South Korea
- Genome-based Bio-IT Convergence Institute, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon Asan-si, Chungcheongnam-do, 31460, South Korea
| | - Jun Hyuck Lee
- Research Unit of Cryogenic Novel Materials, Korea Polar Research Institute, 26 Songdomirae-ro, Yeonsu-gu, Incheon 21990, South Korea
| | - Tae-Jin Oh
- Department of Life Sciences and Biochemical Engineering, Graduate School, Sun Moon University, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon, Asan-si, Chungcheongnam-do, 31460, South Korea
- Genome-based Bio-IT Convergence Institute, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon Asan-si, Chungcheongnam-do, 31460, South Korea
- Department of Pharmaceutical Engineering and Biotechnology, Sun Moon University, 70 Sunmoon-ro 221beon-gil, Tangjeong-myeon, Asan-si, Chungcheongnam-do 31460, South Korea
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5
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Liu Z, Lepori I, Chordia MD, Dalesandro BE, Guo T, Dong J, Siegrist MS, Pires MM. A Metabolic-Tag-Based Method for Assessing the Permeation of Small Molecules Across the Mycomembrane in Live Mycobacteria. Angew Chem Int Ed Engl 2023; 62:e202217777. [PMID: 36700874 PMCID: PMC10159989 DOI: 10.1002/anie.202217777] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/05/2023] [Accepted: 01/24/2023] [Indexed: 01/27/2023]
Abstract
The general lack of permeability of small molecules observed for Mycobacterium tuberculosis (Mtb) is most ascribed to its unique cell envelope. More specifically, the outer mycomembrane is hypothesized to be the principal determinant for access of antibiotics to their molecular targets. We describe a novel assay that combines metabolic tagging of the peptidoglycan, which sits directly beneath the mycomembrane, click chemistry of test molecules, and a fluorescent labeling chase step, to measure the permeation of small molecules. We showed that the assay workflow was robust and compatible with high-throughput analysis in mycobacteria by testing a small panel of azide-tagged molecules. The general trend is similar across the two types of mycobacteria with some notable exceptions. We anticipate that this assay platform will lay the foundation for medicinal chemistry efforts to understand and improve uptake of both existing drugs and newly-discovered compounds into mycobacteria.
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Affiliation(s)
- Zichen Liu
- Department of Chemistry, University of Virginia, Charlottesville, United States
| | - Irene Lepori
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, United States
- Department of Microbiology, University of Massachusetts, Amherst, United States
| | - Mahendra D. Chordia
- Department of Chemistry, University of Virginia, Charlottesville, United States
| | | | - Taijie Guo
- Institute of Translational Medicine, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200232, China
| | - Jiajia Dong
- Institute of Translational Medicine, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200232, China
| | - M. Sloan Siegrist
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, United States
- Department of Microbiology, University of Massachusetts, Amherst, United States
| | - Marcos M. Pires
- Department of Chemistry, University of Virginia, Charlottesville, United States
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6
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Naseer Khan R, Ahn YM, Marriner GA, Via LE, D’Hooge F, Lee SS, Yang N, Basuli F, White AG, Tomko JA, Frye LJ, Scanga CA, Weiner DM, Sutphen ML, Schimel DM, Dayao E, Piazza MK, Gomez F, Dieckmann W, Herscovitch P, Mason NS, Swenson R, Kiesewetter DO, Backus KM, Geng Y, Raj R, Anthony DC, Flynn JL, Barry CE, Davis BG. Distributable, Metabolic PET Reporting of Tuberculosis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.04.03.535218. [PMID: 37333343 PMCID: PMC10274857 DOI: 10.1101/2023.04.03.535218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2023]
Abstract
Tuberculosis remains a large global disease burden for which treatment regimens are protracted and monitoring of disease activity difficult. Existing detection methods rely almost exclusively on bacterial culture from sputum which limits sampling to organisms on the pulmonary surface. Advances in monitoring tuberculous lesions have utilized the common glucoside [18F]FDG, yet lack specificity to the causative pathogen Mycobacterium tuberculosis (Mtb) and so do not directly correlate with pathogen viability. Here we show that a close mimic that is also positron-emitting of the non-mammalian Mtb disaccharide trehalose - 2-[18F]fluoro-2-deoxytrehalose ([18F]FDT) - can act as a mechanism-based enzyme reporter in vivo. Use of [18F]FDT in the imaging of Mtb in diverse models of disease, including non-human primates, successfully co-opts Mtb-specific processing of trehalose to allow the specific imaging of TB-associated lesions and to monitor the effects of treatment. A pyrogen-free, direct enzyme-catalyzed process for its radiochemical synthesis allows the ready production of [18F]FDT from the most globally-abundant organic 18F-containing molecule, [18F]FDG. The full, pre-clinical validation of both production method and [18F]FDT now creates a new, bacterium-specific, clinical diagnostic candidate. We anticipate that this distributable technology to generate clinical-grade [18F]FDT directly from the widely-available clinical reagent [18F]FDG, without need for either bespoke radioisotope generation or specialist chemical methods and/or facilities, could now usher in global, democratized access to a TB-specific PET tracer.
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Affiliation(s)
- R.M. Naseer Khan
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Yong-Mo Ahn
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
| | - Gwendolyn A. Marriner
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
| | - Laura E. Via
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
- Tuberculosis Imaging Program, DIR, NIAID, NIH, Bethesda, MD 20892
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Francois D’Hooge
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Seung Seo Lee
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- School of Chemistry, University of Southampton, Southampton, UK
| | - Nan Yang
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- The Rosalind Franklin Institute, Oxfordshire, OX11 0FA, UK
| | - Falguni Basuli
- Chemistry and Synthesis Center, NHLBI, NIH, Bethesda, MD USA
| | - Alexander G. White
- Department of Microbiology and Molecular Genetics, University of Pittsburgh
| | - Jaime A. Tomko
- Department of Microbiology and Molecular Genetics, University of Pittsburgh
| | - L. James Frye
- Department of Microbiology and Molecular Genetics, University of Pittsburgh
| | - Charles A. Scanga
- Department of Microbiology and Molecular Genetics, University of Pittsburgh
| | - Danielle M. Weiner
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
| | - Michelle L. Sutphen
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
| | - Daniel M. Schimel
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
| | - Emmanuel Dayao
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
| | | | - Felipe Gomez
- Tuberculosis Imaging Program, DIR, NIAID, NIH, Bethesda, MD 20892
| | - William Dieckmann
- Positron Emission Tomography Department, Clinical Center, NIH, Bethesda, MD USA 20892
| | - Peter Herscovitch
- Positron Emission Tomography Department, Clinical Center, NIH, Bethesda, MD USA 20892
| | | | - Rolf Swenson
- Chemistry and Synthesis Center, NHLBI, NIH, Bethesda, MD USA
| | - Dale O. Kiesewetter
- Molecular Tracer and Imaging Core Facility, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, MD 20892
| | - Keriann M. Backus
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Yiqun Geng
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Ritu Raj
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
| | - Daniel C. Anthony
- Laboratory of Experimental Neuropathology, Department of Pharmacology, University of Oxford, Oxford OX1 3QT, UK
| | - JoAnne L. Flynn
- Department of Microbiology and Molecular Genetics, University of Pittsburgh
| | - Clifton E. Barry
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, Division of Intramural Research (DIR), National Institute of Allergy and Infectious Disease (NIAID), National Institutes of Health (NIH), Bethesda, MD USA
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Benjamin G. Davis
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK
- The Rosalind Franklin Institute, Oxfordshire, OX11 0FA, UK
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7
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Zheng Q, Chang PV. Shedding Light on Bacterial Physiology with Click Chemistry. Isr J Chem 2023; 63:e202200064. [PMID: 37841997 PMCID: PMC10569449 DOI: 10.1002/ijch.202200064] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Indexed: 11/11/2022]
Abstract
Bacteria constitute a major lifeform on this planet and play numerous roles in ecology, physiology, and human disease. However, conventional methods to probe their activities are limited in their ability to visualize and identify their functions in these diverse settings. In the last two decades, the application of click chemistry to label these microbes has deepened our understanding of bacterial physiology. With the development of a plethora of chemical tools that target many biological molecules, it is possible to track these microorganisms in real-time and at unprecedented resolution. Here, we review click chemistry, including bioorthogonal reactions, and their applications in imaging bacterial glycans, lipids, proteins, and nucleic acids using chemical reporters. We also highlight significant advances that have enabled biological discoveries that have heretofore remained elusive.
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Affiliation(s)
- Qiuyu Zheng
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853
| | - Pamela V Chang
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853
- Cornell Center for Immunology, Cornell University, Ithaca, NY 14853
- Cornell Institute of Host-Microbe Interactions and Disease, Cornell University, Ithaca, NY 14853
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8
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Banahene N, Kavunja HW, Swarts BM. Chemical Reporters for Bacterial Glycans: Development and Applications. Chem Rev 2022; 122:3336-3413. [PMID: 34905344 PMCID: PMC8958928 DOI: 10.1021/acs.chemrev.1c00729] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Bacteria possess an extraordinary repertoire of cell envelope glycans that have critical physiological functions. Pathogenic bacteria have glycans that are essential for growth and virulence but are absent from humans, making them high-priority targets for antibiotic, vaccine, and diagnostic development. The advent of metabolic labeling with bioorthogonal chemical reporters and small-molecule fluorescent reporters has enabled the investigation and targeting of specific bacterial glycans in their native environments. These tools have opened the door to imaging glycan dynamics, assaying and inhibiting glycan biosynthesis, profiling glycoproteins and glycan-binding proteins, and targeting pathogens with diagnostic and therapeutic payload. These capabilities have been wielded in diverse commensal and pathogenic Gram-positive, Gram-negative, and mycobacterial species─including within live host organisms. Here, we review the development and applications of chemical reporters for bacterial glycans, including peptidoglycan, lipopolysaccharide, glycoproteins, teichoic acids, and capsular polysaccharides, as well as mycobacterial glycans, including trehalose glycolipids and arabinan-containing glycoconjugates. We cover in detail how bacteria-targeting chemical reporters are designed, synthesized, and evaluated, how they operate from a mechanistic standpoint, and how this information informs their judicious and innovative application. We also provide a perspective on the current state and future directions of the field, underscoring the need for interdisciplinary teams to create novel tools and extend existing tools to support fundamental and translational research on bacterial glycans.
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Affiliation(s)
- Nicholas Banahene
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States
- Biochemistry, Cell, and Molecular Biology Program, Central Michigan University, Mount Pleasant, MI, United States
| | - Herbert W. Kavunja
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States
- Biochemistry, Cell, and Molecular Biology Program, Central Michigan University, Mount Pleasant, MI, United States
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9
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Parker HL, Tomás RMF, Furze CM, Guy CS, Fullam E. Asymmetric trehalose analogues to probe disaccharide processing pathways in mycobacteria. Org Biomol Chem 2021; 18:3607-3612. [PMID: 32350493 DOI: 10.1039/d0ob00253d] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The uptake and metabolism of the disaccharide trehalose by Mycobacterium tuberculosis is essential for the virulence of this pathogen. Here we describe the chemoenzymatic synthesis of new azido-functionalised asymmetric trehalose probes that resist degradation by mycobacterial enzymes and are used to probe trehalose processing pathways in mycobacteria.
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Affiliation(s)
- Hadyn L Parker
- School of Life Sciences, University of Warwick, Coventry, CV4 7AL, UK.
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10
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Ignacio BJ, Bakkum T, Bonger KM, Martin NI, van Kasteren SI. Metabolic labeling probes for interrogation of the host-pathogen interaction. Org Biomol Chem 2021; 19:2856-2870. [PMID: 33725048 DOI: 10.1039/d0ob02517h] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Bacterial infections are still one of the leading causes of death worldwide; despite the near-ubiquitous availability of antibiotics. With antibiotic resistance on the rise, there is an urgent need for novel classes of antibiotic drugs. One particularly troublesome class of bacteria are those that have evolved highly efficacious mechanisms for surviving inside the host. These contribute to their virulence by immune evasion, and make them harder to treat with antibiotics due to their residence inside intracellular membrane-limited compartments. This has sparked the development of new chemical reporter molecules and bioorthogonal probes that can be metabolically incorporated into bacteria to provide insights into their activity status. In this review, we provide an overview of several classes of metabolic labeling probes capable of targeting either the peptidoglycan cell wall, the mycomembrane of mycobacteria and corynebacteria, or specific bacterial proteins. In addition, we highlight several important insights that have been made using these metabolic labeling probes.
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Affiliation(s)
- Bob J Ignacio
- Institute for Molecules and Materials, Radbout Universiteit, Nijmegen, Gelderland, Netherlands
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11
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Abstract
The mycomembrane layer of the mycobacterial cell envelope is a barrier to environmental, immune, and antibiotic insults. There is considerable evidence of mycomembrane plasticity during infection and in response to host-mimicking stresses. The mycomembrane layer of the mycobacterial cell envelope is a barrier to environmental, immune, and antibiotic insults. There is considerable evidence of mycomembrane plasticity during infection and in response to host-mimicking stresses. Since mycobacteria are resource and energy limited under these conditions, it is likely that remodeling has distinct requirements from those of the well-characterized biosynthetic program that operates during unrestricted growth. Unexpectedly, we found that mycomembrane remodeling in nutrient-starved, nonreplicating mycobacteria includes synthesis in addition to turnover. Mycomembrane synthesis under these conditions occurs along the cell periphery, in contrast to the polar assembly of actively growing cells, and both liberates and relies on the nonmammalian disaccharide trehalose. In the absence of trehalose recycling, de novo trehalose synthesis fuels mycomembrane remodeling. However, mycobacteria experience ATP depletion, enhanced respiration, and redox stress, hallmarks of futile cycling and the collateral dysfunction elicited by some bactericidal antibiotics. Inefficient energy metabolism compromises the survival of trehalose recycling mutants in macrophages. Our data suggest that trehalose recycling alleviates the energetic burden of mycomembrane remodeling under stress. Cell envelope recycling pathways are emerging targets for sensitizing resource-limited bacterial pathogens to host and antibiotic pressure.
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12
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Kumar G, Narayan R, Kapoor S. Chemical Tools for Illumination of Tuberculosis Biology, Virulence Mechanisms, and Diagnosis. J Med Chem 2020; 63:15308-15332. [PMID: 33307693 DOI: 10.1021/acs.jmedchem.0c01337] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Tuberculosis (TB) remains one of the deadliest infectious diseases and begs the scientific community to up the ante for research and exploration of completely novel therapeutic avenues. Chemical biology-inspired design of tunable chemical tools has aided in clinical diagnosis, facilitated discovery of therapeutics, and begun to enable investigation of virulence mechanisms at the host-pathogen interface of Mycobacterium tuberculosis. This Perspective highlights chemical tools specific to mycobacterial proteins and the cell lipid envelope that have furnished rapid and selective diagnostic strategies and provided unprecedented insights into the function of the mycobacterial proteome and lipidome. We discuss chemical tools that have enabled elucidating otherwise intractable biological processes by leveraging the unique lipid and metabolite repertoire of mycobacterial species. Some of these probes represent exciting starting points with the potential to illuminate poorly understood aspects of mycobacterial pathogenesis, particularly the host membrane-pathogen interactions.
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Affiliation(s)
- Gautam Kumar
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
| | - Rishikesh Narayan
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, Ponda 403 401, Goa, India
| | - Shobhna Kapoor
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India.,Wadhwani Research Center for Bioengineering, Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
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13
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Hevey R. The Role of Fluorine in Glycomimetic Drug Design. Chemistry 2020; 27:2240-2253. [DOI: 10.1002/chem.202003135] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Indexed: 11/10/2022]
Affiliation(s)
- Rachel Hevey
- Department of Pharmaceutical Sciences University of Basel, Pharmazentrum Klingelbergstrasse 50 4056 Basel Switzerland
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14
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Cambier CJ, Banik SM, Buonomo JA, Bertozzi CR. Spreading of a mycobacterial cell-surface lipid into host epithelial membranes promotes infectivity. eLife 2020; 9:60648. [PMID: 33226343 PMCID: PMC7735756 DOI: 10.7554/elife.60648] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 11/23/2020] [Indexed: 12/31/2022] Open
Abstract
Several virulence lipids populate the outer cell wall of pathogenic mycobacteria. Phthiocerol dimycocerosate (PDIM), one of the most abundant outer membrane lipids, plays important roles in both defending against host antimicrobial programs and in evading these programs altogether. Immediately following infection, mycobacteria rely on PDIM to evade Myd88-dependent recruitment of microbicidal monocytes which can clear infection. To circumvent the limitations in using genetics to understand virulence lipids, we developed a chemical approach to track PDIM during Mycobacterium marinum infection of zebrafish. We found that PDIM's methyl-branched lipid tails enabled it to spread into host epithelial membranes to prevent immune activation. Additionally, PDIM’s affinity for cholesterol promoted this phenotype; treatment of zebrafish with statins, cholesterol synthesis inhibitors, decreased spreading and provided protection from infection. This work establishes that interactions between host and pathogen lipids influence mycobacterial infectivity and suggests the use of statins as tuberculosis preventive therapy by inhibiting PDIM spread.
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Affiliation(s)
- C J Cambier
- Department of Chemistry, Stanford University, Stanford, United States
| | - Steven M Banik
- Department of Chemistry, Stanford University, Stanford, United States
| | - Joseph A Buonomo
- Department of Chemistry, Stanford University, Stanford, United States
| | - Carolyn R Bertozzi
- Department of Chemistry, Stanford University, Stanford, United States.,Howard Hughes Medical Institute, Stanford University, Stanford, United States
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15
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Kalera K, Stothard AI, Woodruff PJ, Swarts BM. The role of chemoenzymatic synthesis in advancing trehalose analogues as tools for combatting bacterial pathogens. Chem Commun (Camb) 2020; 56:11528-11547. [PMID: 32914793 PMCID: PMC7919099 DOI: 10.1039/d0cc04955g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Trehalose, a disaccharide of glucose, is increasingly recognized as an important contributor to virulence in major bacterial pathogens, such as Mycobacterium tuberculosis, Clostridioides difficile, and Burkholderia pseudomallei. Accordingly, bacterial trehalose metabolic pathways that are not present in humans have gained traction as targets for antibiotic and diagnostic development. Toward this goal, trehalose can be modified through a combination of rational design and synthesis to produce functionalized trehalose analogues, which can be deployed to probe or inhibit bacterial trehalose metabolism. However, the unique α,α-1,1-glycosidic bond and C2 symmetry of trehalose make analogue synthesis via traditional chemical methods very challenging. We and others have turned to the creation of chemoenzymatic synthesis methods, which in principle allow the use of nature's trehalose-synthesizing enzymes to stereo- and regioselectively couple simple, unprotected substrates to efficiently and conveniently generate trehalose analogues. Here, we provide a contextual account of our team's development of a trehalose analogue synthesis method that employs a highly substrate-tolerant, thermostable trehalose synthase enzyme, TreT from Thermoproteus tenax. Then, in three vignettes, we highlight how chemoenzymatic synthesis has accelerated the development of trehalose-based imaging probes and inhibitors that target trehalose-utilizing bacterial pathogens. We describe the role of TreT catalysis and related methods in the development of (i) tools for in vitro and in vivo imaging of mycobacteria, (ii) anti-biofilm compounds that sensitize drug-tolerant mycobacteria to clinical anti-tubercular compounds, and (iii) degradation-resistant trehalose analogues that block trehalose metabolism in C. difficile and potentially other trehalose-utilizing bacteria. We conclude by recapping progress and discussing priorities for future research in this area, including improving the scope and scale of chemoenzymatic synthesis methods to support translational research and expanding the functionality and applicability of trehalose analogues to study and target diverse bacterial pathogens.
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Affiliation(s)
- Karishma Kalera
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, USA.
| | - Alicyn I Stothard
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, USA.
| | - Peter J Woodruff
- Department of Chemistry, University of Southern Maine, Portland, ME, USA
| | - Benjamin M Swarts
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, USA.
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16
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Mestrom L, Marsden SR, van der Eijk H, Laustsen JU, Jeffries CM, Svergun DI, Hagedoorn PL, Bento I, Hanefeld U. Anomeric Selectivity of Trehalose Transferase with Rare l-Sugars. ACS Catal 2020; 10:8835-8839. [PMID: 32953231 PMCID: PMC7493220 DOI: 10.1021/acscatal.0c02117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/21/2020] [Indexed: 11/30/2022]
Abstract
Retaining LeLoir glycosyltransferases catalyze the formation of glycosidic bonds between nucleotide sugar donors and carbohydrate acceptors. The anomeric selectivity of trehalose transferase from Thermoproteus uzoniensis was investigated for both d- and l-glycopyranose acceptors. The enzyme couples a wide range of carbohydrates, yielding trehalose analogues with conversion and enantioselectivity of >98%. The anomeric selectivity inverts from α,α-(1 → 1)-glycosidic bonds for d-glycopyranose acceptors to α,β-(1 → 1)-glycosidic bonds for l-glycopyranose acceptors, while (S)-selectivity was retained for both types of sugar acceptors. Comparison of protein crystal structures of trehalose transferase in complex with α,α-trehalose and an unnatural α,β-trehalose analogue highlighted the mechanistic rationale for the observed inversion of anomeric selectivity.
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Affiliation(s)
- Luuk Mestrom
- Department
of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Stefan R. Marsden
- Department
of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Hessel van der Eijk
- Department
of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Jesper U. Laustsen
- European
Molecular Biology Laboratory, EMBL, Hamburg Unit, Notkestraβe 85, 22607 Hamburg, Germany
| | - Cy M. Jeffries
- European
Molecular Biology Laboratory, EMBL, Hamburg Unit, Notkestraβe 85, 22607 Hamburg, Germany
| | - Dmitri I. Svergun
- European
Molecular Biology Laboratory, EMBL, Hamburg Unit, Notkestraβe 85, 22607 Hamburg, Germany
| | - Peter-Leon Hagedoorn
- Department
of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Isabel Bento
- European
Molecular Biology Laboratory, EMBL, Hamburg Unit, Notkestraβe 85, 22607 Hamburg, Germany
| | - Ulf Hanefeld
- Department
of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
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17
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Kuenstner EJ, Palumbo EA, Levine J, Snyder NL. Synthesis of isobemisiose, neosartose, and fischerose: three α-1,6-linked trehalose-based oligosaccharides identified from Neosartorya fischeri. RSC Adv 2020; 10:22726-22729. [PMID: 35514568 PMCID: PMC9054618 DOI: 10.1039/d0ra04137h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 06/04/2020] [Indexed: 11/21/2022] Open
Abstract
Three complex α-1,6-linked trehalose-based oligosaccharides with unique preservation properties, isobemisiose, neosartose, and fischerose, were recently identified from the extreme stress-tolerant ascospores of Neosartorya fischeri. Herein, we report the first concise, scalable, and iterative chemical synthesis of these oligosaccharides from a differentially protected thioglycoside donor and a selectively protected, asymmetric trehalose acceptor. This work constitutes an improved synthesis of isobemisiose, and is also the first reported synthesis of neosartose, a tetrasaccharide, and fischerose, a pentasaccharide, in good yield. Importantly, in-depth studies of biological function are enabled by this synthetic platform.
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Affiliation(s)
- E J Kuenstner
- Department of Chemistry, Davidson College Box 7120 Davidson NC 28036 USA
| | - E A Palumbo
- Department of Chemistry, Davidson College Box 7120 Davidson NC 28036 USA
| | - J Levine
- Department of Chemistry, Davidson College Box 7120 Davidson NC 28036 USA
| | - N L Snyder
- Department of Chemistry, Davidson College Box 7120 Davidson NC 28036 USA
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18
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Mestrom L, Marsden SR, McMillan DGG, Schoevaart R, Hagedoorn P, Hanefeld U. Comparison of Enzymes Immobilised on Immobeads and Inclusion Bodies: A Case Study of a Trehalose Transferase. ChemCatChem 2020. [DOI: 10.1002/cctc.202000241] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Luuk Mestrom
- Biokatalyse, Afdeling BiotechnologieTechnische Universiteit Delft Van Der Maasweg 9 2629 HZ Delft The Netherlands
| | - Stefan R. Marsden
- Biokatalyse, Afdeling BiotechnologieTechnische Universiteit Delft Van Der Maasweg 9 2629 HZ Delft The Netherlands
| | - Duncan G. G. McMillan
- Biokatalyse, Afdeling BiotechnologieTechnische Universiteit Delft Van Der Maasweg 9 2629 HZ Delft The Netherlands
| | - Rob Schoevaart
- ChiralVisionHoog-Harnasch 44 2635 DL Den Hoorn The Netherlands
| | - Peter‐Leon Hagedoorn
- Biokatalyse, Afdeling BiotechnologieTechnische Universiteit Delft Van Der Maasweg 9 2629 HZ Delft The Netherlands
| | - Ulf Hanefeld
- Biokatalyse, Afdeling BiotechnologieTechnische Universiteit Delft Van Der Maasweg 9 2629 HZ Delft The Netherlands
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19
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Ausmus AP, Hogue M, Snyder JL, Rundell SR, Bednarz KM, Banahene N, Swarts BM. Ferrier Carbocyclization-Mediated Synthesis of Enantiopure Azido Inositol Analogues. J Org Chem 2020; 85:3182-3191. [DOI: 10.1021/acs.joc.9b03064] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alex P. Ausmus
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Maxwell Hogue
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Justin L. Snyder
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Sarah R. Rundell
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Krestina M. Bednarz
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Nicholas Banahene
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
| | - Benjamin M. Swarts
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, Michigan 48859, United States
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20
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Williams DA, Pradhan K, Paul A, Olin IR, Tuck OT, Moulton KD, Kulkarni SS, Dube DH. Metabolic inhibitors of bacterial glycan biosynthesis. Chem Sci 2020; 11:1761-1774. [PMID: 34123271 PMCID: PMC8148367 DOI: 10.1039/c9sc05955e] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 01/08/2020] [Indexed: 12/14/2022] Open
Abstract
The bacterial cell wall is a quintessential drug target due to its critical role in colonization of the host, pathogen survival, and immune evasion. The dense cell wall glycocalyx contains distinctive monosaccharides that are absent from human cells, and proper assembly of monosaccharides into higher-order glycans is critical for bacterial fitness and pathogenesis. However, the systematic study and inhibition of bacterial glycosylation enzymes remains challenging. Bacteria produce glycans containing rare deoxy amino sugars refractory to traditional glycan analysis, complicating the study of bacterial glycans and the creation of glycosylation inhibitors. To ease the study of bacterial glycan function in the absence of detailed structural or enzyme information, we crafted metabolic inhibitors based on rare bacterial monosaccharide scaffolds. Metabolic inhibitors were assessed for their ability to interfere with glycan biosynthesis and fitness in pathogenic and symbiotic bacterial species. Three metabolic inhibitors led to dramatic structural and functional defects in Helicobacter pylori. Strikingly, these inhibitors acted in a bacteria-selective manner. These metabolic inhibitors will provide a platform for systematic study of bacterial glycosylation enzymes not currently possible with existing tools. Moreover, their selectivity will provide a pathway for the development of novel, narrow-spectrum antibiotics to treat infectious disease. Our inhibition approach is general and will expedite the identification of bacterial glycan biosynthesis inhibitors in a range of systems, expanding the glycochemistry toolkit.
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Affiliation(s)
- Daniel A Williams
- Department of Chemistry & Biochemistry, Bowdoin College 6600 College Station Brunswick ME 04011 USA
| | - Kabita Pradhan
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Ankita Paul
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Ilana R Olin
- Department of Chemistry & Biochemistry, Bowdoin College 6600 College Station Brunswick ME 04011 USA
| | - Owen T Tuck
- Department of Chemistry & Biochemistry, Bowdoin College 6600 College Station Brunswick ME 04011 USA
| | - Karen D Moulton
- Department of Chemistry & Biochemistry, Bowdoin College 6600 College Station Brunswick ME 04011 USA
| | - Suvarn S Kulkarni
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Danielle H Dube
- Department of Chemistry & Biochemistry, Bowdoin College 6600 College Station Brunswick ME 04011 USA
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21
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Danielson ND, Collins J, Stothard AI, Dong QQ, Kalera K, Woodruff PJ, DeBosch BJ, Britton RA, Swarts BM. Degradation-resistant trehalose analogues block utilization of trehalose by hypervirulent Clostridioides difficile. Chem Commun (Camb) 2019; 55:5009-5012. [PMID: 30968891 PMCID: PMC6499371 DOI: 10.1039/c9cc01300h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Trehalose is used as an additive in thousands of foods, cosmetics, and pharmaceutical products, and it is being investigated as a therapeutic for multiple human diseases. However, its ability to be used as a carbon source by microbes is a concern, as highlighted by the recent finding that trehalose can be metabolized by and potentially enhance the virulence of epidemic Clostridioides difficile. Here, we show that trehalose analogues designed to resist enzymatic degradation are incapable of being used as carbon sources by C. difficile. Furthermore, we demonstrate that trehalose analogues, but not the known trehalase inhibitor validamycin A, inhibit native trehalose utilization by hypervirulent C. difficile. Thus, degradation-resistant trehalose analogues are valuable as trehalase inhibitors and as surrogates for or co-additives with trehalose in applications where enzymatic breakdown is a concern.
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Affiliation(s)
- Noah D Danielson
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, USA.
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22
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Artificial Fusion of mCherry Enhances Trehalose Transferase Solubility and Stability. Appl Environ Microbiol 2019; 85:AEM.03084-18. [PMID: 30737350 DOI: 10.1128/aem.03084-18] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Accepted: 02/01/2019] [Indexed: 11/20/2022] Open
Abstract
LeLoir glycosyltransferases are important biocatalysts for the production of glycosidic bonds in natural products, chiral building blocks, and pharmaceuticals. Trehalose transferase (TreT) is of particular interest since it catalyzes the stereo- and enantioselective α,α-(1→1) coupling of a nucleotide sugar donor and monosaccharide acceptor for the synthesis of disaccharide derivatives. Heterologously expressed thermophilic trehalose transferases were found to be intrinsically aggregation prone and are mainly expressed as catalytically active inclusion bodies in Escherichia coli To disfavor protein aggregation, the thermostable protein mCherry was explored as a fluorescent protein tag. The fusion of mCherry to trehalose transferase from Pyrobaculum yellowstonensis (PyTreT) demonstrated increased protein solubility. Chaotropic agents like guanidine or the divalent cations Mn(II), Ca(II), and Mg(II) enhanced the enzyme activity of the fusion protein. The thermodynamic equilibrium constant, K eq, for the reversible synthesis of trehalose from glucose and a nucleotide sugar was determined in both the synthesis and hydrolysis directions utilizing UDP-glucose and ADP-glucose, respectively. UDP-glucose was shown to achieve higher conversions than ADP-glucose, highlighting the importance of the choice of nucleotide sugars for LeLoir glycosyltransferases under thermodynamic control.IMPORTANCE The heterologous expression of proteins in Escherichia coli is of great relevance for their functional and structural characterization and applications. However, the formation of insoluble inclusion bodies is observed in approximately 70% of all cases, and the subsequent effects can range from reduced soluble protein yields to a complete failure of the expression system. Here, we present an efficient methodology for the production and analysis of a thermostable, aggregation-prone trehalose transferase (TreT) from Pyrobaculum yellowstonensis via its fusion with mCherry as a thermostable fluorescent protein tag. This fusion strategy allowed for increased enzyme stability and solubility and could be applied to other (thermostable) proteins, allowing rapid visualization and quantification of the mCherry-fused protein of interest. Finally, we have demonstrated that the enzymatic synthesis of trehalose from glucose and a nucleotide sugar is reversible by approaching the thermodynamic equilibrium in both the synthesis and hydrolysis directions. Our results show that uridine establishes an equilibrium constant which is more in favor of the product trehalose than when adenosine is employed as the nucleotide under identical conditions. The influence of different nucleotides on the reaction can be generalized for all LeLoir glycosyltransferases under thermodynamic control as the position of the equilibrium depends solely on the reaction conditions and is not affected by the nature of the catalyst.
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23
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Lesur E, Baron A, Dietrich C, Buchotte M, Doisneau G, Urban D, Beau JM, Bayan N, Vauzeilles B, Guianvarc’h D, Bourdreux Y. First access to a mycolic acid-based bioorthogonal reporter for the study of the mycomembrane and mycoloyltransferases in Corynebacteria. Chem Commun (Camb) 2019; 55:13074-13077. [DOI: 10.1039/c9cc05754d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study we describe the first synthesis of an alkyne-based trehalose monomycolate probe closely mimicking the complex pattern of mycolic acids and its utility for the study of mycomembrane and mycoloyltransferases in Corynebacteria.
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24
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Peña-Zalbidea S, Huang AYT, Kavunja HW, Salinas B, Desco M, Drake C, Woodruff PJ, Vaquero JJ, Swarts BM. Chemoenzymatic radiosynthesis of 2-deoxy-2-[ 18F]fluoro-d-trehalose ([ 18F]-2-FDTre): A PET radioprobe for in vivo tracing of trehalose metabolism. Carbohydr Res 2018; 472:16-22. [PMID: 30428395 DOI: 10.1016/j.carres.2018.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 10/24/2018] [Accepted: 11/03/2018] [Indexed: 02/07/2023]
Abstract
Trehalose analogues bearing fluorescent and click chemistry tags have been developed as probes of bacterial trehalose metabolism, but these tools have limitations with respect to in vivo imaging applications. Here, we report the radiosynthesis of the 18F-modified trehalose analogue 2-deoxy-2-[18F]fluoro-d-trehalose ([18F]-2-FDTre), which in principle can be used in conjunction with positron emission tomography (PET) imaging to allow in vivo imaging of trehalose metabolism in various contexts. A chemoenzymatic method employing the thermophilic TreT enzyme from Thermoproteus tenax was used to rapidly (15-20 min), efficiently (70% radiochemical yield; ≥ 95% radiochemical purity), and reproducibly convert the commercially available radiotracer 2-deoxy-2-[18F]fluoro-d-glucose ([18F]-2-FDG) into the target radioprobe [18F]-2-FDTre in a single step; both manual and automated syntheses were performed with similar results. Cellular uptake experiments showed that radiosynthetic [18F]-2-FDTre was metabolized by Mycobacterium smegmatis but not by various mammalian cell lines, pointing to the potential future use of this radioprobe for selective PET imaging of infections caused by trehalose-metabolizing bacterial pathogens such as M. tuberculosis.
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Affiliation(s)
- Santiago Peña-Zalbidea
- Dept. Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Madrid, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
| | - Ashley Y-T Huang
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States
| | - Herbert W Kavunja
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States
| | - Beatriz Salinas
- Dept. Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Madrid, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain; Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | - Manuel Desco
- Dept. Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Madrid, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain; Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Spain
| | | | - Peter J Woodruff
- Department of Chemistry, University of Southern Maine, Portland, ME, United States
| | - Juan J Vaquero
- Dept. Bioingeniería e Ingeniería Aeroespacial, Universidad Carlos III de Madrid, Madrid, Spain; Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain.
| | - Benjamin M Swarts
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI, United States.
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25
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Higgins CB, Zhang Y, Mayer AL, Fujiwara H, Stothard AI, Graham MJ, Swarts BM, DeBosch BJ. Hepatocyte ALOXE3 is induced during adaptive fasting and enhances insulin sensitivity by activating hepatic PPARγ. JCI Insight 2018; 3:120794. [PMID: 30135298 PMCID: PMC6141168 DOI: 10.1172/jci.insight.120794] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 07/10/2018] [Indexed: 12/12/2022] Open
Abstract
The hepatic glucose fasting response is gaining traction as a therapeutic pathway to enhance hepatic and whole-host metabolism. However, the mechanisms underlying these metabolic effects remain unclear. Here, we demonstrate the epidermal-type lipoxygenase, eLOX3 (encoded by its gene, Aloxe3), is a potentially novel effector of the therapeutic fasting response. We show that Aloxe3 is activated during fasting, glucose withdrawal, or trehalose/trehalose analogue treatment. Hepatocyte-specific Aloxe3 expression reduced weight gain and hepatic steatosis in diet-induced and genetically obese (db/db) mouse models. Aloxe3 expression, moreover, enhanced basal thermogenesis and abrogated insulin resistance in db/db diabetic mice. Targeted metabolomics demonstrated accumulation of the PPARγ ligand 12-KETE in hepatocytes overexpressing Aloxe3. Strikingly, PPARγ inhibition reversed hepatic Aloxe3–mediated insulin sensitization, suppression of hepatocellular ATP production and oxygen consumption, and gene induction of PPARγ coactivator-1α (PGC1α) expression. Moreover, hepatocyte-specific PPARγ deletion reversed the therapeutic effect of hepatic Aloxe3 expression on diet-induced insulin intolerance. Aloxe3 is, therefore, a potentially novel effector of the hepatocellular fasting response that leverages both PPARγ-mediated and pleiotropic effects to augment hepatic and whole-host metabolism, and it is, thus, a promising target to ameliorate metabolic disease. The lipoxygenase ALOXE3 is an effector of the hepatic fasting response that improves insulin sensitivity by activating hepatic PPARγ.
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Affiliation(s)
| | | | | | - Hideji Fujiwara
- Department of Medicine, Diabetic Cardiovascular Disease Center, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Alicyn I Stothard
- Department of Chemistry & Biochemistry, Central Michigan University, Mt. Pleasant, Michigan, USA
| | | | - Benjamin M Swarts
- Department of Chemistry & Biochemistry, Central Michigan University, Mt. Pleasant, Michigan, USA
| | - Brian J DeBosch
- Department of Pediatrics and.,Department of Cell Biology & Physiology, Washington University School of Medicine, St. Louis, Missouri, USA
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26
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Groenevelt JM, Meints LM, Stothard AI, Poston AW, Fiolek TJ, Finocchietti DH, Mulholand VM, Woodruff PJ, Swarts BM. Chemoenzymatic Synthesis of Trehalosamine, an Aminoglycoside Antibiotic and Precursor to Mycobacterial Imaging Probes. J Org Chem 2018; 83:8662-8667. [PMID: 29973045 DOI: 10.1021/acs.joc.8b00810] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Trehalosamine (2-amino-2-deoxy-α,α-d-trehalose) is an aminoglycoside with antimicrobial activity against Mycobacterium tuberculosis, and it is also a versatile synthetic intermediate used to access imaging probes for mycobacteria. To overcome inefficient chemical synthesis approaches, we report a two-step chemoenzymatic synthesis of trehalosamine that features trehalose synthase (TreT)-catalyzed glycosylation as the key transformation. Soluble and recyclable immobilized forms of TreT were successfully employed. We demonstrate that chemoenzymatically synthesized trehalosamine can be elaborated to two complementary imaging probes, which label mycobacteria via distinct pathways.
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Affiliation(s)
- Jessica M Groenevelt
- Department of Chemistry and Biochemistry , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Lisa M Meints
- Department of Chemistry and Biochemistry , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Alicyn I Stothard
- Department of Chemistry and Biochemistry , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Anne W Poston
- Department of Chemistry and Biochemistry , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - Taylor J Fiolek
- Department of Chemistry and Biochemistry , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
| | - David H Finocchietti
- Department of Chemistry , University of Southern Maine , Portland , Maine 04104 , United States
| | - Victoria M Mulholand
- Department of Chemistry , University of Southern Maine , Portland , Maine 04104 , United States
| | - Peter J Woodruff
- Department of Chemistry , University of Southern Maine , Portland , Maine 04104 , United States
| | - Benjamin M Swarts
- Department of Chemistry and Biochemistry , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
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27
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Rodriguez-Rivera FP, Zhou X, Theriot JA, Bertozzi CR. Acute Modulation of Mycobacterial Cell Envelope Biogenesis by Front-Line Tuberculosis Drugs. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Frances P. Rodriguez-Rivera
- Department of Chemistry; University of California; Berkeley CA 94720 USA
- Department of Chemistry; Stanford University; Stanford CA 94305 USA
| | - Xiaoxue Zhou
- Department of Biochemistry; Stanford University School of Medicine; Stanford CA 94305 USA
| | - Julie A. Theriot
- Department of Biochemistry; Stanford University School of Medicine; Stanford CA 94305 USA
- Department of Microbiology and Immunology; Stanford University School of Medicine; Stanford CA 94305 USA
- Howard Hughes Medical Institute; Stanford University; Stanford CA 94305 USA
| | - Carolyn R. Bertozzi
- Department of Chemistry; Stanford University; Stanford CA 94305 USA
- Howard Hughes Medical Institute; Stanford University; Stanford CA 94305 USA
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28
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Rodriguez-Rivera FP, Zhou X, Theriot JA, Bertozzi CR. Acute Modulation of Mycobacterial Cell Envelope Biogenesis by Front-Line Tuberculosis Drugs. Angew Chem Int Ed Engl 2018; 57:5267-5272. [PMID: 29392891 DOI: 10.1002/anie.201712020] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 01/28/2018] [Indexed: 02/06/2023]
Abstract
Front-line tuberculosis (TB) drugs have been characterized extensively in vitro and in vivo with respect to gene expression and cell viability. However, little work has been devoted to understanding their effects on the physiology of the cell envelope, one of the main targets of this clinical regimen. Herein, we use metabolic labeling methods to visualize the effects of TB drugs on cell envelope dynamics in mycobacterial species. We developed a new fluorophore-trehalose conjugate to visualize trehalose monomycolates of the mycomembrane using super-resolution microscopy. We also probed the relationship between mycomembrane and peptidoglycan dynamics using a dual metabolic labeling strategy. Finally, we found that metabolic labeling of both cell envelope structures reports on drug effects on cell physiology in two hours, far faster than a genetic sensor of cell envelope stress. Our work provides insight into acute drug effects on cell envelope biogenesis in live mycobacteria.
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Affiliation(s)
- Frances P Rodriguez-Rivera
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA.,Department of Chemistry, Stanford University, Stanford, CA, 94305, USA
| | - Xiaoxue Zhou
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Julie A Theriot
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, 94305, USA.,Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, 94305, USA.,Howard Hughes Medical Institute, Stanford University, Stanford, CA, 94305, USA
| | - Carolyn R Bertozzi
- Department of Chemistry, Stanford University, Stanford, CA, 94305, USA.,Howard Hughes Medical Institute, Stanford University, Stanford, CA, 94305, USA
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29
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Abstract
Cell surface trehalose mycolates are important modulators of mycobacterial pathogenesis and host immune response. We discuss the use of fluorescent and fluorogenic trehalose probes for the detection of the mycobacterial trehalose glycolipids. These probes enable real-time imaging of trehalose mycolate biosynthesis and mycomembrane dynamics in the laboratory as well as in clinical settings for the detection of mycobacteria in patient samples.
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Affiliation(s)
| | - Peyton Shieh
- Stanford University, Stanford, CA, United States
| | - Carolyn R Bertozzi
- Stanford University, Stanford, CA, United States; Howard Hughes Medical Institute, Stanford University, Chevy Chase, MD, United States.
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30
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O'Neill MK, Piligian BF, Olson CD, Woodruff PJ, Swarts BM. Tailoring Trehalose for Biomedical and Biotechnological Applications. PURE APPL CHEM 2017; 89:1223-1249. [PMID: 29225379 PMCID: PMC5718624 DOI: 10.1515/pac-2016-1025] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Trehalose is a non-reducing sugar whose ability to stabilize biomolecules has brought about its widespread use in biological preservation applications. Trehalose is also an essential metabolite in a number of pathogens, most significantly the global pathogen Mycobacterium tuberculosis, though it is absent in humans and other mammals. Recently, there has been a surge of interest in modifying the structure of trehalose to generate analogues that have applications in biomedical research and biotechnology. Non-degradable trehalose analogues could have a number of advantages as bioprotectants and food additives. Trehalose-based imaging probes and inhibitors are already useful as research tools and may have future value in the diagnosis and treatment of tuberculosis, among other uses. Underlying the advancements made in these areas are novel synthetic methods that facilitate access to and evaluation of trehalose analogues. In this review, we focus on both aspects of the development of this class of molecules. First, we consider the chemical and chemoenzymatic methods that have been used to prepare trehalose analogues and discuss their prospects for synthesis on commercially relevant scales. Second, we describe ongoing efforts to develop and deploy detectable trehalose analogues, trehalose-based inhibitors, and non-digestible trehalose analogues. The current and potential future uses of these compounds are discussed, with an emphasis on their roles in understanding and combatting mycobacterial infection.
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Affiliation(s)
- Mara K O'Neill
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, USA
| | - Brent F Piligian
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, USA
| | - Claire D Olson
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, USA
| | - Peter J Woodruff
- Department of Chemistry, University of Southern Maine, Portland, ME, USA
| | - Benjamin M Swarts
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, USA
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31
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Wolber JM, Urbanek BL, Meints LM, Piligian BF, Lopez-Casillas IC, Zochowski KM, Woodruff PJ, Swarts BM. The trehalose-specific transporter LpqY-SugABC is required for antimicrobial and anti-biofilm activity of trehalose analogues in Mycobacterium smegmatis. Carbohydr Res 2017; 450:60-66. [PMID: 28917089 DOI: 10.1016/j.carres.2017.08.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 08/03/2017] [Accepted: 08/03/2017] [Indexed: 12/26/2022]
Abstract
Mycobacteria, including the bacterial pathogen that causes human tuberculosis, possess distinctive pathways for synthesizing and utilizing the non-mammalian disaccharide trehalose. Trehalose metabolism is essential for mycobacterial viability and has been linked to in vitro biofilm formation, which may bear relevance to in vivo drug tolerance. Previous research has shown that some trehalose analogues bearing modifications at the 6-position inhibit growth of various mycobacterial species. In this work, 2-, 5-, and 6-position-modified trehalose analogues were synthesized using our previously reported one-step chemoenzymatic method and shown to inhibit growth and biofilm formation in the two-to three-digit micromolar range in Mycobacterium smegmatis. The trehalose-specific ABC transporter LpqY-SugABC was essential for antimicrobial and anti-biofilm activity, suggesting that inhibition by monosubstituted trehalose analogues requires cellular uptake and does not proceed via direct action on extracellular targets such as antigen 85 acyltransferases or trehalose dimycolate hydrolase. Although the potency of the described compounds in in vitro growth and biofilm assays is moderate, this study reports the first trehalose-based mycobacterial biofilm inhibitors and reinforces the concept of exploiting unique sugar uptake pathways to deliver inhibitors and other chemical cargo to mycobacteria.
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Affiliation(s)
- Jeffrey M Wolber
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States
| | - Bailey L Urbanek
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States
| | - Lisa M Meints
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States
| | - Brent F Piligian
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States
| | - Irene C Lopez-Casillas
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States
| | - Kailey M Zochowski
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States
| | - Peter J Woodruff
- Department of Chemistry, University of Southern Maine, Portland, ME 04104, United States
| | - Benjamin M Swarts
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, United States.
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32
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Progress and prospects for small-molecule probes of bacterial imaging. Nat Chem Biol 2017; 12:472-8. [PMID: 27315537 DOI: 10.1038/nchembio.2109] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 05/13/2016] [Indexed: 11/09/2022]
Abstract
Fluorescence microscopy is an essential tool for the exploration of cell growth, division, transcription and translation in eukaryotes and prokaryotes alike. Despite the rapid development of techniques to study bacteria, the size of these organisms (1-10 μm) and their robust and largely impenetrable cell envelope present major challenges in imaging experiments. Fusion-based strategies, such as attachment of the protein of interest to a fluorescent protein or epitope tag, are by far the most common means for examining protein localization and expression in prokaryotes. While valuable, the use of genetically encoded tags can result in mislocalization or altered activity of the desired protein, does not provide a readout of the catalytic state of enzymes and cannot enable visualization of many other important cellular components, such as peptidoglycan, lipids, nucleic acids or glycans. Here, we highlight the use of biomolecule-specific small-molecule probes for imaging in bacteria.
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33
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Rodriguez-Rivera FP, Zhou X, Theriot JA, Bertozzi CR. Visualization of mycobacterial membrane dynamics in live cells. J Am Chem Soc 2017; 139:3488-3495. [PMID: 28075574 PMCID: PMC5345120 DOI: 10.1021/jacs.6b12541] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Mycobacteria are endowed with a highly impermeable mycomembrane that confers intrinsic resistance to many antibiotics. Several unique mycomembrane glycolipids have been isolated and structurally characterized, but the underlying organization and dynamics of glycolipids within the cell envelope remain poorly understood. We report here a study of mycomembrane dynamics that was enabled by trehalose-fluorophore conjugates capable of labeling trehalose glycolipids in live actinomycetes. We identified fluorescein-trehalose analogues that are metabolically incorporated into the trehalose mycolates of representative Mycobacterium, Corynebacterium, Nocardia, and Rhodococcus species. Using these probes, we studied the mobilities of labeled glycolipids by time-lapse microscopy and fluorescence recovery after photobleaching experiments and found that mycomembrane fluidity varies widely across species and correlates with mycolic acid structure. Finally, we discovered that treatment of mycobacteria with ethambutol, a front-line tuberculosis (TB) drug, significantly increases mycomembrane fluidity. These findings enhance our understanding of mycobacterial cell envelope structure and dynamics and have implications for development of TB drug cocktails.
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Affiliation(s)
- Frances P Rodriguez-Rivera
- Department of Chemistry, University of California , Berkeley, California 94720, United States.,Department of Chemistry, Stanford University , Stanford, California 94305, United States
| | | | - Julie A Theriot
- Howard Hughes Medical Institute , Chevy Chase, Maryland 20815, United States
| | - Carolyn R Bertozzi
- Department of Chemistry, Stanford University , Stanford, California 94305, United States.,Howard Hughes Medical Institute , Chevy Chase, Maryland 20815, United States
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34
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Meints LM, Poston AW, Piligian BF, Olson CD, Badger KS, Woodruff PJ, Swarts BM. Rapid One-step Enzymatic Synthesis and All-aqueous Purification of Trehalose Analogues. J Vis Exp 2017:54485. [PMID: 28287534 PMCID: PMC5351780 DOI: 10.3791/54485] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Chemically modified versions of trehalose, or trehalose analogues, have applications in biology, biotechnology, and pharmaceutical science, among other fields. For instance, trehalose analogues bearing detectable tags have been used to detect Mycobacterium tuberculosis and may have applications as tuberculosis diagnostic imaging agents. Hydrolytically stable versions of trehalose are also being pursued due to their potential for use as non-caloric sweeteners and bioprotective agents. Despite the appeal of this class of compounds for various applications, their potential remains unfulfilled due to the lack of a robust route for their production. Here, we report a detailed protocol for the rapid and efficient one-step biocatalytic synthesis of trehalose analogues that bypasses the problems associated with chemical synthesis. By utilizing the thermostable trehalose synthase (TreT) enzyme from Thermoproteus tenax, trehalose analogues can be generated in a single step from glucose analogues and uridine diphosphate glucose in high yield (up to quantitative conversion) in 15-60 min. A simple and rapid non-chromatographic purification protocol, which consists of spin dialysis and ion exchange, can deliver many trehalose analogues of known concentration in aqueous solution in as little as 45 min. In cases where unreacted glucose analogue still remains, chromatographic purification of the trehalose analogue product can be performed. Overall, this method provides a "green" biocatalytic platform for the expedited synthesis and purification of trehalose analogues that is efficient and accessible to non-chemists. To exemplify the applicability of this method, we describe a protocol for the synthesis, all-aqueous purification, and administration of a trehalose-based click chemistry probe to mycobacteria, all of which took less than 1 hour and enabled fluorescence detection of mycobacteria. In the future, we envision that, among other applications, this protocol may be applied to the rapid synthesis of trehalose-based probes for tuberculosis diagnostics. For instance, short-lived radionuclide-modified trehalose analogues (e.g., 18F-modified trehalose) could be used for advanced clinical imaging modalities such as positron emission tomography-computed tomography (PET-CT).
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Affiliation(s)
- Lisa M Meints
- Department of Chemistry and Biochemistry, Central Michigan University
| | - Anne W Poston
- Department of Chemistry and Biochemistry, Central Michigan University
| | - Brent F Piligian
- Department of Chemistry and Biochemistry, Central Michigan University
| | - Claire D Olson
- Department of Chemistry and Biochemistry, Central Michigan University
| | | | | | - Benjamin M Swarts
- Department of Chemistry and Biochemistry, Central Michigan University;
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35
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Rundell SR, Wagar ZL, Meints LM, Olson CD, O'Neill MK, Piligian BF, Poston AW, Hood RJ, Woodruff PJ, Swarts BM. Deoxyfluoro-d-trehalose (FDTre) analogues as potential PET probes for imaging mycobacterial infection. Org Biomol Chem 2016; 14:8598-609. [PMID: 27560008 DOI: 10.1039/c6ob01734g] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Mycobacterium tuberculosis, the etiological agent of human tuberculosis, requires the non-mammalian disaccharide trehalose for growth and virulence. Recently, detectable trehalose analogues have gained attention as probes for studying trehalose metabolism and as potential diagnostic imaging agents for mycobacterial infections. Of particular interest are deoxy-[(18)F]fluoro-d-trehalose ((18)F-FDTre) analogues, which have been suggested as possible positron emission tomography (PET) probes for in vivo imaging of M. tuberculosis infection. Here, we report progress toward this objective, including the synthesis and conformational analysis of four non-radioactive deoxy-[(19)F]fluoro-d-trehalose ((19)F-FDTre) analogues, as well as evaluation of their uptake by M. smegmatis. The rapid synthesis and purification of several (19)F-FDTre analogues was accomplished in high yield using a one-step chemoenzymatic method. Conformational analysis of the (19)F-FDTre analogues using NMR and molecular modeling methods showed that fluorine substitution had a negligible effect on the conformation of the native disaccharide, suggesting that fluorinated analogues may be successfully recognized and processed by trehalose metabolic machinery in mycobacteria. To test this hypothesis and to evaluate a possible route for delivery of FDTre probes specifically to mycobacteria, we showed that (19)F-FDTre analogues are actively imported into M. smegmatis via the trehalose-specific transporter SugABC-LpqY. Finally, to demonstrate the applicability of these results to the efficient preparation and use of short-lived (18)F-FDTre PET radiotracers, we carried out (19)F-FDTre synthesis, purification, and administration to M. smegmatis in 1 hour.
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Affiliation(s)
- Sarah R Rundell
- Department of Chemistry and Biochemistry, Central Michigan University, Mount Pleasant, MI 48859, USA.
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36
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Foley HN, Stewart JA, Kavunja HW, Rundell SR, Swarts BM. Bioorthogonal Chemical Reporters for Selective In Situ Probing of Mycomembrane Components in Mycobacteria. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201509216] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hannah N. Foley
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Jessica A. Stewart
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Herbert W. Kavunja
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Sarah R. Rundell
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Benjamin M. Swarts
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
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37
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Foley HN, Stewart JA, Kavunja HW, Rundell SR, Swarts BM. Bioorthogonal Chemical Reporters for Selective In Situ Probing of Mycomembrane Components in Mycobacteria. Angew Chem Int Ed Engl 2016; 55:2053-7. [DOI: 10.1002/anie.201509216] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 12/04/2015] [Indexed: 12/17/2022]
Affiliation(s)
- Hannah N. Foley
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Jessica A. Stewart
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Herbert W. Kavunja
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Sarah R. Rundell
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
| | - Benjamin M. Swarts
- Department of Chemistry and Biochemistry Central Michigan University Mount Pleasant MI 48859 USA
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38
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Zhou J, Jayawardana KW, Kong N, Ren Y, Hao N, Yan M, Ramström O. Trehalose-Conjugated, Photofunctionalized Mesoporous Silica Nanoparticles for Efficient Delivery of Isoniazid into Mycobacteria. ACS Biomater Sci Eng 2015; 1:1250-1255. [DOI: 10.1021/acsbiomaterials.5b00274] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan Zhou
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
| | - Kalana W. Jayawardana
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Na Kong
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
| | - Yansong Ren
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
| | - Nanjing Hao
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Mingdi Yan
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Olof Ramström
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
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39
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Affiliation(s)
- Clifton Barry
- Tuberculosis Research Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA. Department of Clinical Laboratory Sciences, University of Cape Town, Cape Town, South Africa. Department of Molecular Biology and Human Genetics, Stellenbosch University, Stellenbosch, South Africa.
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40
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Walmagh M, Zhao R, Desmet T. Trehalose Analogues: Latest Insights in Properties and Biocatalytic Production. Int J Mol Sci 2015; 16:13729-45. [PMID: 26084050 PMCID: PMC4490520 DOI: 10.3390/ijms160613729] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 06/09/2015] [Indexed: 12/23/2022] Open
Abstract
Trehalose (α-D-glucopyranosyl α-D-glucopyranoside) is a non-reducing sugar with unique stabilizing properties due to its symmetrical, low energy structure consisting of two 1,1-anomerically bound glucose moieties. Many applications of this beneficial sugar have been reported in the novel food (nutricals), medical, pharmaceutical and cosmetic industries. Trehalose analogues, like lactotrehalose (α-D-glucopyranosyl α-D-galactopyranoside) or galactotrehalose (α-D-galactopyranosyl α-D-galactopyranoside), offer similar benefits as trehalose, but show additional features such as prebiotic or low-calorie sweetener due to their resistance against hydrolysis during digestion. Unfortunately, large-scale chemical production processes for trehalose analogues are not readily available at the moment due to the lack of efficient synthesis methods. Most of the procedures reported in literature suffer from low yields, elevated costs and are far from environmentally friendly. "Greener" alternatives found in the biocatalysis field, including galactosidases, trehalose phosphorylases and TreT-type trehalose synthases are suggested as primary candidates for trehalose analogue production instead. Significant progress has been made in the last decade to turn these into highly efficient biocatalysts and to broaden the variety of useful donor and acceptor sugars. In this review, we aim to provide an overview of the latest insights and future perspectives in trehalose analogue chemistry, applications and production pathways with emphasis on biocatalysis.
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Affiliation(s)
- Maarten Walmagh
- Center for Industrial Biotechnology and Biocatalysis, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent 9000, Belgium.
| | - Renfei Zhao
- Center for Industrial Biotechnology and Biocatalysis, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent 9000, Belgium.
| | - Tom Desmet
- Center for Industrial Biotechnology and Biocatalysis, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, Ghent 9000, Belgium.
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41
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Siegrist MS, Swarts BM, Fox DM, Lim SA, Bertozzi CR. Illumination of growth, division and secretion by metabolic labeling of the bacterial cell surface. FEMS Microbiol Rev 2015; 39:184-202. [PMID: 25725012 DOI: 10.1093/femsre/fuu012] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The cell surface is the essential interface between a bacterium and its surroundings. Composed primarily of molecules that are not directly genetically encoded, this highly dynamic structure accommodates the basic cellular processes of growth and division as well as the transport of molecules between the cytoplasm and the extracellular milieu. In this review, we describe aspects of bacterial growth, division and secretion that have recently been uncovered by metabolic labeling of the cell envelope. Metabolite derivatives can be used to label a variety of macromolecules, from proteins to non-genetically-encoded glycans and lipids. The embedded metabolite enables precise tracking in time and space, and the versatility of newer chemoselective detection methods offers the ability to execute multiple experiments concurrently. In addition to reviewing the discoveries enabled by metabolic labeling of the bacterial cell envelope, we also discuss the potential of these techniques for translational applications. Finally, we offer some guidelines for implementing this emerging technology.
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Affiliation(s)
- M Sloan Siegrist
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Benjamin M Swarts
- Department of Chemistry, Central Michigan University, Mount Pleasant, MI 48859, USA
| | - Douglas M Fox
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Shion An Lim
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Carolyn R Bertozzi
- Department of Chemistry, University of California, Berkeley, CA 94720, USA Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA
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42
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Stewart JA, Piligian BF, Rundell SR, Swarts BM. A trifunctional cyclooctyne for modifying azide-labeled biomolecules with photocrosslinking and affinity tags. Chem Commun (Camb) 2015; 51:17600-3. [DOI: 10.1039/c5cc07536j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A trifunctional cyclooctyne-based reagent that harnesses bioorthogonal chemistry to facilitate the probing of biomolecular interactions is described.
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Affiliation(s)
- Jessica A. Stewart
- Department of Chemistry and Biochemistry
- Central Michigan University
- Mount Pleasant
- USA
| | - Brent F. Piligian
- Department of Chemistry and Biochemistry
- Central Michigan University
- Mount Pleasant
- USA
| | - Sarah R. Rundell
- Department of Chemistry and Biochemistry
- Central Michigan University
- Mount Pleasant
- USA
| | - Benjamin M. Swarts
- Department of Chemistry and Biochemistry
- Central Michigan University
- Mount Pleasant
- USA
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