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Ayoup MS, Ghanem M, Abdel-Hamid H, Abu-Serie MM, Masoud A, Ghareeb DA, Hawsawi MB, Sonousi A, Kassab AE. New 1,2,4-oxadiazole derivatives as potential multifunctional agents for the treatment of Alzheimer's disease: design, synthesis, and biological evaluation. BMC Chem 2024; 18:130. [PMID: 39003489 DOI: 10.1186/s13065-024-01235-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Accepted: 06/25/2024] [Indexed: 07/15/2024] Open
Abstract
A series of new 1,2,4-oxadiazole-based derivatives were synthesized and evaluated for their anti-AD potential. The results revealed that eleven compounds (1b, 2a-c, 3b, 4a-c, and 5a-c) exhibited excellent inhibitory potential against AChE, with IC50 values ranging from 0.00098 to 0.07920 µM. Their potency was 1.55 to 125.47 times higher than that of donepezil (IC50 = 0.12297 µM). In contrast, the newly synthesized oxadiazole derivatives with IC50 values in the range of 16.64-70.82 µM exhibited less selectivity towards BuChE when compared to rivastigmine (IC50 = 5.88 µM). Moreover, oxadiazole derivative 2c (IC50 = 463.85 µM) was more potent antioxidant than quercetin (IC50 = 491.23 µM). Compounds 3b (IC50 = 536.83 µM) and 3c (IC50 = 582.44 µM) exhibited comparable antioxidant activity to that of quercetin. Oxadiazole derivatives 3b (IC50 = 140.02 µM) and 4c (IC50 = 117.43 µM) showed prominent MAO-B inhibitory potential. They were more potent than biperiden (IC50 = 237.59 µM). Compounds 1a, 1b, 3a, 3c, and 4b exhibited remarkable MAO-A inhibitory potential, with IC50 values ranging from 47.25 to 129.7 µM. Their potency was 1.1 to 3.03 times higher than that of methylene blue (IC50 = 143.6 µM). Most of the synthesized oxadiazole derivatives provided significant protection against induced HRBCs lysis, revealing the nontoxic effect of the synthesized compounds, thus making them safe drug candidates. The results unveiled oxadiazole derivatives 2b, 2c, 3b, 4a, 4c, and 5a as multitarget anti-AD agents. The high AChE inhibitory potential can be computationally explained by the synthesized oxadiazole derivatives' significant interactions with the AChE active site. Compound 2b showed good physicochemical properties. All these data suggest that 2b could be considered as a promising candidate for future development.
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Affiliation(s)
- Mohammed Salah Ayoup
- Department of Chemistry, College of Science, King Faisal University, Al-Ahsa, 31982, Saudi Arabia.
- Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria, 21321, Egypt.
| | - Mariam Ghanem
- Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria, 21321, Egypt
| | - Hamida Abdel-Hamid
- Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426, Alexandria, 21321, Egypt
| | - Marwa M Abu-Serie
- Medical Biotechnology Department, Genetic Engineering and Biotechnology Research Institute, City of Scientific Research and Technological Applications (SRTA-City), Alexandria, Egypt
| | - Aliaa Masoud
- Bio-screening and Preclinical Trial Lab, Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt
| | - Doaa A Ghareeb
- Bio-screening and Preclinical Trial Lab, Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt
- Center of Excellence for Drug Preclinical Studies (CE-DPS), Pharmaceutical and Fermentation Industry Development Center, City of Scientific Research & Technological Applications (SRTA-city), New Borg El Arab, Alexandria, Egypt
- Research Projects Unit, Pharos University in Alexandria, Alexandria, Egypt
| | - Mohammed B Hawsawi
- Department of Chemistry, Faculty of Science, Umm Al-Qura University, Makkah, 21955, Saudi Arabia
| | - Amr Sonousi
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo, P.O. Box 11562, Cairo, Egypt
- University of Hertfordshire hosted by Global Academic Foundation, New Administrative Capital, Cairo, Egypt
| | - Asmaa E Kassab
- Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo, P.O. Box 11562, Cairo, Egypt.
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2
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Zhang S, Lin T, Zhang D, Chen X, Ge Y, Gao Q, Fan J. Use of the selected metal-dependent enzymes for exploring applicability of human annexin A1 as a purification tag. J Biosci Bioeng 2023; 136:423-429. [PMID: 37805288 DOI: 10.1016/j.jbiosc.2023.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 08/23/2023] [Accepted: 08/29/2023] [Indexed: 10/09/2023]
Abstract
Several fusion tags have been developed for non-chromatographic fusion protein purification. Previously, we identified that human annexin A1 as a novel N-terminal purification tag was used for purifying the fusion proteins produced in Escherichia coli through precipitation in 10 mM Ca2+ buffer, and redissolution of the precipitate in 15 mM EDTA buffer. In this work, we selected four metal-dependent enzymes including E. coli 5-aminolevulinate dehydratase, yeast 3-hydroxyanthranilate 3,4-dioxygenase, maize serine racemase and copper amine oxidase for investigating the annexin A1 tag applicability. Fusion of the His6-tag or the enzyme changed the behavior of precipitation-redissolution. The relatively high recovery yields of three tagged enzymes with the improved purities were obtained through two rounds of purification, whereas low recovery yield of the annexin A1 tagged maize amine oxidase was prepared. The added EDTA displayed different abilities to redissolve the fusion proteins precipitates in two precipitation-redissolution cycles. It inactivated three enzymes and obviously inhibited the activity of the fused maize serine racemase. Based on current findings, we believe that four enzymes could be applied for evaluating applicability of the proteins or peptides as affinity tags for chromatographic purification in a calcium dependent manner.
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Affiliation(s)
- Shuncheng Zhang
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Tingting Lin
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Di Zhang
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Xiaofeng Chen
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Yuanyuan Ge
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Qing Gao
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
| | - Jun Fan
- School of Life Science, Anhui Agricultural University, Hefei, Anhui 230036, China.
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3
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Chitty JL, Yam M, Perryman L, Parker AL, Skhinas JN, Setargew YFI, Mok ETY, Tran E, Grant RD, Latham SL, Pereira BA, Ritchie SC, Murphy KJ, Trpceski M, Findlay AD, Melenec P, Filipe EC, Nadalini A, Velayuthar S, Major G, Wyllie K, Papanicolaou M, Ratnaseelan S, Phillips PA, Sharbeen G, Youkhana J, Russo A, Blackwell A, Hastings JF, Lucas MC, Chambers CR, Reed DA, Stoehr J, Vennin C, Pidsley R, Zaratzian A, Da Silva AM, Tayao M, Charlton B, Herrmann D, Nobis M, Clark SJ, Biankin AV, Johns AL, Croucher DR, Nagrial A, Gill AJ, Grimmond SM, Pajic M, Timpson P, Jarolimek W, Cox TR. A first-in-class pan-lysyl oxidase inhibitor impairs stromal remodeling and enhances gemcitabine response and survival in pancreatic cancer. NATURE CANCER 2023; 4:1326-1344. [PMID: 37640930 PMCID: PMC10518255 DOI: 10.1038/s43018-023-00614-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 07/07/2023] [Indexed: 08/31/2023]
Abstract
The lysyl oxidase family represents a promising target in stromal targeting of solid tumors due to the importance of this family in crosslinking and stabilizing fibrillar collagens and its known role in tumor desmoplasia. Using small-molecule drug-design approaches, we generated and validated PXS-5505, a first-in-class highly selective and potent pan-lysyl oxidase inhibitor. We demonstrate in vitro and in vivo that pan-lysyl oxidase inhibition decreases chemotherapy-induced pancreatic tumor desmoplasia and stiffness, reduces cancer cell invasion and metastasis, improves tumor perfusion and enhances the efficacy of chemotherapy in the autochthonous genetically engineered KPC model, while also demonstrating antifibrotic effects in human patient-derived xenograft models of pancreatic cancer. PXS-5505 is orally bioavailable, safe and effective at inhibiting lysyl oxidase activity in tissues. Our findings present the rationale for progression of a pan-lysyl oxidase inhibitor aimed at eliciting a reduction in stromal matrix to potentiate chemotherapy in pancreatic ductal adenocarcinoma.
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Affiliation(s)
- Jessica L Chitty
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
| | - Michelle Yam
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Lara Perryman
- Pharmaxis, Frenchs Forest, New South Wales, Australia
| | - Amelia L Parker
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
| | - Joanna N Skhinas
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Yordanos F I Setargew
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Ellie T Y Mok
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Emmi Tran
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Rhiannon D Grant
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Sharissa L Latham
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Brooke A Pereira
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Shona C Ritchie
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Kendelle J Murphy
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Michael Trpceski
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | | | - Pauline Melenec
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Elysse C Filipe
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
| | - Audrey Nadalini
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Sipiththa Velayuthar
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Gretel Major
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Kaitlin Wyllie
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Michael Papanicolaou
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Shivanjali Ratnaseelan
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Phoebe A Phillips
- School of Biomedical Sciences, Faculty of Medicine, Lowy Cancer Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - George Sharbeen
- School of Biomedical Sciences, Faculty of Medicine, Lowy Cancer Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - Janet Youkhana
- School of Biomedical Sciences, Faculty of Medicine, Lowy Cancer Research Centre, UNSW Sydney, Sydney, New South Wales, Australia
| | - Alice Russo
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Antonia Blackwell
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Jordan F Hastings
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Morghan C Lucas
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Cecilia R Chambers
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Daniel A Reed
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Janett Stoehr
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Claire Vennin
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Ruth Pidsley
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Anaiis Zaratzian
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Andrew M Da Silva
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Michael Tayao
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | | | - David Herrmann
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
| | - Max Nobis
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- Intravital Imaging Expertise Center, VIB Center for Cancer Biology, VIB, Leuven, Belgium
| | - Susan J Clark
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Andrew V Biankin
- Wolfson Wohl Cancer Research Centre, School of Cancer Sciences, University of Glasgow, Glasgow, UK
- West of Scotland Pancreatic Unit, Glasgow Royal Infirmary, Glasgow, UK
| | - Amber L Johns
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - David R Croucher
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Adnan Nagrial
- Department of Medical Oncology, Westmead Hospital, Sydney, New South Wales, Australia
| | - Anthony J Gill
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
- NSW Health Pathology, Department of Anatomical Pathology, Royal North Shore Hospital, Sydney, New South Wales, Australia
- Cancer Diagnosis and Pathology Research Group, Kolling Institute of Medical Research, Sydney, New South Wales, Australia
| | - Sean M Grimmond
- University of Melbourne Centre for Cancer Research, VCCC, Melbourne, Victoria, Australia
| | - Marina Pajic
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
- The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
| | - Paul Timpson
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia
| | | | - Thomas R Cox
- Cancer Ecosystems Program, The Garvan Institute of Medical Research and The Kinghorn Cancer Centre, Darlinghurst, New South Wales, Australia.
- School of Clinical Medicine, St Vincent's Healthcare Clinical Campus, UNSW Medicine and Health, UNSW Sydney, Sydney, New South Wales, Australia.
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4
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Reis J, Binda C. The Peroxidase-Coupled Assay to Measure MAO Enzymatic Activity. Methods Mol Biol 2023; 2558:23-34. [PMID: 36169853 DOI: 10.1007/978-1-0716-2643-6_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
MAO activity measurement is generally performed following different spectroscopy methods, in most cases using peroxidase as a coupled reaction catalyst. In the presence of horseradish peroxidase (HRP), the assay follows the oxidation of the typical MAO substrate (aromatic amines) which generates hydrogen peroxide as a secondary product. There are several chromogens and fluorogens that, in the presence of hydrogen peroxide, are converted by HRP to detectable products. In the present chapter we describe the spectrophotometric 4-aminoantipyrine assay as well as the fluorogenic assay with the Amplex® Red chemical probe. These methods are applied on MAO activity and Michaelis-Menten curve determinations as well as inhibitory activity experiments.
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Affiliation(s)
- Joana Reis
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy
| | - Claudia Binda
- Department of Biology and Biotechnology, University of Pavia, Pavia, Italy.
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5
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Holt A. Radiochemical Assay of Monoamine Oxidase Activity. Methods Mol Biol 2023; 2558:45-61. [PMID: 36169855 DOI: 10.1007/978-1-0716-2643-6_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The activity of monoamine oxidase enzymes may be quantified by measuring the conversion of a radiolabeled amine substrate to a radiolabeled product that occurs during incubation of the substrate with the enzyme in an aqueous buffer. Described herein is an established discontinuous procedure in which separation of the substrate and product is achieved by extracting uncharged aldehydes into an organic solvent, while cationic amines remain in an acidified aqueous layer. Under assay conditions designed to ensure a pseudo-linear catalytic rate for the duration of the incubation, determination of radioactivity in the organic solvent by liquid scintillation counting facilitates estimation of an initial rate for amine turnover.
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Affiliation(s)
- Andrew Holt
- Neurochemical Research Unit, Department of Psychiatry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
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6
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Holt A. Conventional Receptor Radioligand Binding Techniques Applied to the Study of Monoamine Oxidase. Methods Mol Biol 2023; 2558:75-96. [PMID: 36169857 DOI: 10.1007/978-1-0716-2643-6_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Designed to measure binding interactions between small molecules and receptor proteins, radioligand binding approaches may also be applied to interactions between monoamine oxidase (MAO) and its ligands. The technique may be used with tissue homogenates or with mitochondrial membranes and can provide information about binding site density, ligand affinity, binding rate constants, and binding events at sites that do not impact absorbance characteristics of the flavin cofactor and that may not be amenable to spectrophotometric studies. This overview describes the use of a cell harvester in a common filtration approach to measure binding to MAO of radiolabeled substrates, inhibitors, or allosteric ligands in saturation analyses and to take advantage of the principles of competition to obtain quantitative binding data for unlabeled ligands that may bind with much lower affinity. The quality and reproducibility of data are impacted by factors such as choice of ligand concentrations, pipetting technique, graphing and regression approaches, and scintillation counting parameters, and consideration is given to these and other factors that may influence the results.
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Affiliation(s)
- Andrew Holt
- Neurochemical Research Unit, Department of Psychiatry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
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7
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Topical application of an irreversible small molecule inhibitor of lysyl oxidases ameliorates skin scarring and fibrosis. Nat Commun 2022; 13:5555. [PMID: 36138009 PMCID: PMC9500072 DOI: 10.1038/s41467-022-33148-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 08/24/2022] [Indexed: 01/12/2023] Open
Abstract
Scarring is a lifelong consequence of skin injury, with scar stiffness and poor appearance presenting physical and psychological barriers to a return to normal life. Lysyl oxidases are a family of enzymes that play a critical role in scar formation and maintenance. Lysyl oxidases stabilize the main component of scar tissue, collagen, and drive scar stiffness and appearance. Here we describe the development and characterisation of an irreversible lysyl oxidase inhibitor, PXS-6302. PXS-6302 is ideally suited for skin treatment, readily penetrating the skin when applied as a cream and abolishing lysyl oxidase activity. In murine models of injury and fibrosis, topical application reduces collagen deposition and cross-linking. Topical application of PXS-6302 after injury also significantly improves scar appearance without reducing tissue strength in porcine injury models. PXS-6302 therefore represents a promising therapeutic to ameliorate scar formation, with potentially broader applications in other fibrotic diseases.
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8
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Aronoff MR, Hiebert P, Hentzen NB, Werner S, Wennemers H. Imaging and targeting LOX-mediated tissue remodeling with a reactive collagen peptide. Nat Chem Biol 2021; 17:865-871. [PMID: 34253910 DOI: 10.1038/s41589-021-00830-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 06/09/2021] [Indexed: 02/06/2023]
Abstract
Collagens are fibrous proteins that are integral to the strength and stability of connective tissues. During collagen maturation, lysyl oxidases (LOX) initiate the cross-linking of fibers, but abnormal LOX activity is associated with impaired tissue function as seen in fibrotic and malignant diseases. Visualizing and targeting this dynamic process in healthy and diseased tissue is important, but so far not feasible. Here we present a probe for the simultaneous monitoring and targeting of LOX-mediated collagen cross-linking that combines a LOX-activity sensor with a collagen peptide to chemoselectively target endogenous aldehydes generated by LOX. This synergistic probe becomes covalently anchored and lights up in vivo and in situ in response to LOX at the sites where cross-linking occurs, as demonstrated by staining of normal skin and cancer sections. We anticipate that our reactive collagen-based sensor will improve understanding of collagen remodeling and provide opportunities for the diagnosis of fibrotic and malignant diseases.
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Affiliation(s)
| | - Paul Hiebert
- Institute of Molecular Health Sciences, ETH Zurich, Zurich, Switzerland
| | - Nina B Hentzen
- Laboratory of Organic Chemistry, ETH Zurich, Zurich, Switzerland
| | - Sabine Werner
- Institute of Molecular Health Sciences, ETH Zurich, Zurich, Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, ETH Zurich, Zurich, Switzerland.
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9
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Overview of the Neuroprotective Effects of the MAO-Inhibiting Antidepressant Phenelzine. Cell Mol Neurobiol 2021; 42:225-242. [PMID: 33839994 PMCID: PMC8732914 DOI: 10.1007/s10571-021-01078-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 03/10/2021] [Indexed: 12/18/2022]
Abstract
Phenelzine (PLZ) is a monoamine oxidase (MAO)-inhibiting antidepressant with anxiolytic properties. This multifaceted drug has a number of pharmacological and neurochemical effects in addition to inhibition of MAO, and findings on these effects have contributed to a body of evidence indicating that PLZ also has neuroprotective/neurorescue properties. These attributes are reviewed in this paper and include catabolism to the active metabolite β-phenylethylidenehydrazine (PEH) and effects of PLZ and PEH on the GABA-glutamate balance in brain, sequestration of reactive aldehydes, and inhibition of primary amine oxidase. Also discussed are the encouraging findings of the effects of PLZ in animal models of stroke, spinal cord injury, traumatic brain injury, and multiple sclerosis, as well other actions such as reduction of nitrative stress, reduction of the effects of a toxin on dopaminergic neurons, potential anticonvulsant actions, and effects on brain-derived neurotrophic factor, neural cell adhesion molecules, an anti-apoptotic factor, and brain levels of ornithine and N-acetylamino acids.
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10
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Methylxanthines Inhibit Primary Amine Oxidase and Monoamine Oxidase Activities of Human Adipose Tissue. MEDICINES 2020; 7:medicines7040018. [PMID: 32252407 PMCID: PMC7235778 DOI: 10.3390/medicines7040018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/26/2020] [Accepted: 03/28/2020] [Indexed: 12/13/2022]
Abstract
Background: Methylxanthines including caffeine and theobromine are widely consumed compounds and were recently shown to interact with bovine copper-containing amine oxidase. To the best of our knowledge, no direct demonstration of any interplay between these phytochemicals and human primary amine oxidase (PrAO) has been reported to date. We took advantage of the coexistence of PrAO and monoamine oxidase (MAO) activities in human subcutaneous adipose tissue (hScAT) to test the interaction between several methylxanthines and these enzymes, which are involved in many key pathophysiological processes. Methods: Benzylamine, methylamine, and tyramine were used as substrates for PrAO and MAO in homogenates of subcutaneous adipose depots obtained from overweight women undergoing plastic surgery. Methylxanthines were tested as substrates or inhibitors by fluorimetric determination of hydrogen peroxide, an end-product of amine oxidation. Results: Semicarbazide-sensitive PrAO activity was inhibited by theobromine, caffeine, and isobutylmethylxanthine (IBMX) while theophylline, paraxanthine, and 7-methylxanthine had little effect. Theobromine inhibited PrAO activity by 54% at 2.5 mM. Overall, the relationship between methylxanthine structure and the degree of inhibition was similar to that seen with bovine PrAO, although higher concentrations (mM) were required for inhibition. Theobromine also inhibited oxidation of tyramine by MAO, at the limits of its solubility in a DMSO vehicle. At doses higher than 12 % v/v, DMSO impaired MAO activity. MAO was also inhibited by millimolar doses of IBMX, caffeine and by other methylxanthines to a lesser extent. Conclusions: This preclinical study extrapolates previous findings with bovine PrAO to human tissues. Given that PrAO is a potential target for anti-inflammatory drugs, it indicates that alongside phosphodiesterase inhibition and adenosine receptor antagonism, PrAO and MAO inhibition could contribute to the health benefits of methylxanthines, especially their anti-inflammatory effects.
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Couturier M, Bhalara HD, Chawrai SR, Monson R, Williamson NR, Salmond GPC, Leeper FJ. Substrate Flexibility of the Flavin-Dependent Dihydropyrrole Oxidases PigB and HapB Involved in Antibiotic Prodigiosin Biosynthesis. Chembiochem 2020; 21:523-530. [PMID: 31433555 PMCID: PMC7065143 DOI: 10.1002/cbic.201900424] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Indexed: 11/28/2022]
Abstract
In the biosynthesis of the tripyrrolic pigment prodigiosin, PigB is a predicted flavin-dependent oxidase responsible for the formation of 2-methyl-3-amylpyrrole (MAP) from a dihydropyrrole. To prove which dihydropyrrole is the true intermediate, both possibilities, 5-methyl-4-pentyl-3,4-dihydro-2H-pyrrole (5 a, resulting from transamination of the aldehyde of 3-acetyloctanal) and 2-methyl-3-pentyl-3,4-dihydro-2H-pyrrole (6, resulting from transamination of the ketone), were synthesised. Only 5 a restored pigment production in a strain of Serratia sp. ATCC 39006 blocked earlier in MAP biosynthesis. PigB is membrane-associated and inactive when its transmembrane domain was deleted, but HapB, its homologue in Hahella chejuensis, lacks the transmembrane domain and is active in solution. Two colourimetric assays for PigB and HapB were developed, and the HapB-catalysed reaction was kinetically characterised. Ten analogues of 5 a were synthesised, varying in the C2 and C3 side chains, and tested as substrates of HapB in vitro and for restoration of pigment production in Serratia ΔpigD in vivo. All lengths of side chain tested at C3 were accepted, but only short side chains at C2 were accepted. The knowledge that 5 a is an intermediate in prodigiosin biosynthesis and the ease of synthesis of analogues of 5 a makes a range of prodigiosin analogues readily available by mutasynthesis.
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Affiliation(s)
- Maxime Couturier
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Hiral D. Bhalara
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Suresh R. Chawrai
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Rita Monson
- Department of BiochemistryUniversity of CambridgeTennis Court RoadCambridgeCB2 1QWUK
| | - Neil R. Williamson
- Department of BiochemistryUniversity of CambridgeTennis Court RoadCambridgeCB2 1QWUK
| | - George P. C. Salmond
- Department of BiochemistryUniversity of CambridgeTennis Court RoadCambridgeCB2 1QWUK
| | - Finian J. Leeper
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
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12
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Identification and Characterization of Citrus Peel Uronic Acid Oxidase. Chembiochem 2019; 21:797-800. [DOI: 10.1002/cbic.201900546] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Indexed: 11/07/2022]
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13
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Findlay AD, Foot JS, Buson A, Deodhar M, Jarnicki AG, Hansbro PM, Liu G, Schilter H, Turner CI, Zhou W, Jarolimek W. Identification and Optimization of Mechanism-Based Fluoroallylamine Inhibitors of Lysyl Oxidase-like 2/3. J Med Chem 2019; 62:9874-9889. [DOI: 10.1021/acs.jmedchem.9b01283] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Alison D. Findlay
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Jonathan S. Foot
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Alberto Buson
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Mandar Deodhar
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Andrew G. Jarnicki
- Centre for Healthy Lungs, The University of Newcastle and Hunter Medical Research Institute, Newcastle, New South Wales 2300, Australia
| | - Philip M. Hansbro
- Centre for Healthy Lungs, The University of Newcastle and Hunter Medical Research Institute, Newcastle, New South Wales 2300, Australia
- Centre for Inflammation, Centenary Institute, Sydney, New South Wales 2050, Australia
- Faculty of Science, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Gang Liu
- Centre for Inflammation, Centenary Institute, Sydney, New South Wales 2050, Australia
- Faculty of Science, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Heidi Schilter
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Craig I. Turner
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Wenbin Zhou
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
| | - Wolfgang Jarolimek
- Pharmaxis Ltd, 20 Rodborough Road, Frenchs Forest, Sydney, New South Wales 2086, Australia
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14
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Debon A, Pott M, Obexer R, Green AP, Friedrich L, Griffiths AD, Hilvert D. Ultrahigh-throughput screening enables efficient single-round oxidase remodelling. Nat Catal 2019. [DOI: 10.1038/s41929-019-0340-5] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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15
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Combined Cross-Linked Enzyme Aggregates of Monoamine Oxidase and Putrescine Oxidase as a Bifunctional Biocatalyst for Determination of Biogenic Amines in Foods. Catalysts 2019. [DOI: 10.3390/catal9070579] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In order to determine total biogenic amines in fermented foods, the combined cross-linked enzyme aggregates of a monoamine oxidase and a putrescine oxidase (combi-CLEAs) and the cross-linked enzyme aggregates (CLEAs) of the fused enzyme of two amine oxidases (MonoAmine Putrescien Oxidase, MAPO) were prepared. The effects of various parameters were examined to optimize the CLEAs formation. Biochemical characterization and stability of free and the CLEAs enzymes were performed. Through optimization of the CLEAs formation condition, the combi-CLEAs and the CLEAs-MAPO were prepared with 82% and 78% of residual activities relative to the activities of the subjected enzymes were in a preparative scale. The optimal pH for tyramine-activities of the CLEAs enzymes were shifted to relatively basic pH, leading to synchronization of the optimal performances of combi-CLEAs over pH for tyramine and putrescine. In addition, thermostability of the CLEAs enzymes were improved with almost double half-lives at 65 °C in comparison to the free enzymes. The catalytic efficiencies of combi-CLEAs for tyramine, histamine and putrescine were reduced by 41%, 56%, and 31%, respectively, and the inhibition potency by the substrate was reduced by two-fold in comparison of the mixed free enzymes. In conclusion, combi-CLEAs are a promising catalyst with the improved stability and the same optimum pH for dual activities in enzymatic determination of biogenic amines in foods.
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16
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On the practical aspects of characterising monoamine oxidase inhibition in vitro. J Neural Transm (Vienna) 2018; 125:1685-1705. [PMID: 30374594 DOI: 10.1007/s00702-018-1943-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 10/13/2018] [Indexed: 10/28/2022]
Abstract
The development of novel inhibitors of human monoamine oxidase enzymes with improved pharmacodynamic and pharmacokinetic profiles has, in the past, been hampered by limited access to enzyme, by assay protocols offering limited throughput, and by inappropriate analyses of kinetic data. More recently, high-level expression of human enzymes in yeast has facilitated thorough examinations of steady-state enzyme behaviour that have led to improvements in our understanding of the mathematical underpinnings of kinetic analyses of monoamine oxidases. However, with these improvements have come a realisation that to be useful, more data points across wider concentration ranges are required. In turn, many discontinuous assay approaches, such as those involving radiolabelled substrates or chromatographic separation of product from substrate, have been rendered somewhat obsolete. Justification for the use of a platereader-based approach to assess the effects of novel inhibitors on monamine oxidases is provided, along with details of experimental design optimised to address the unexpectedly complex kinetics followed by these enzymes. Potential sources of error are discussed, and comments provided on techniques that may enhance the quality of experimental data.
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17
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Shanahan P, O'Sullivan J, Tipton KF, Kinsella GK, Ryan BJ, Henehan GTM. Theobromine and related methylxanthines as inhibitors of Primary Amine Oxidase. J Food Biochem 2018; 43:e12697. [PMID: 31353656 DOI: 10.1111/jfbc.12697] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 08/31/2018] [Accepted: 09/13/2018] [Indexed: 02/02/2023]
Abstract
Methylxanthines are among the most widely consumed drugs in the world and evidence of their health benefits has been growing in recent years. Primary Amine Oxidase (PrAO) has been recognized as a therapeutic target for the amelioration of inflammatory, vascular, and neurodegenerative diseases. Previous work in our laboratories showed that caffeine inhibited Bovine PrAO with a Ki of 1.0 mM using benzylamine as substrate. This study aimed to extend our previous work and explore the possibility that related methylxanthines might influence PrAO activity. While paraxanthine, theophylline, and 7-methylxanthine had little effect on PrAO, theobromine was a noncompetitive inhibitor with a Ki of 276 ± 44 µM. The specific structural elements of methylxanthines that are required for inhibition allow us to suggest that their binding site on PrAO may be a target for therapeutics. The health benefits associated with dietary methylxanthine consumption could involve PrAO inhibition. PRACTICAL APPLICATIONS: Inhibition of PrAO by methylxanthines may be significant in conferring health benefits. The design of PrAO inhibitors based on the structural motifs identified in this study (N-methylation at specific locations) is indicated. Existing therapeutics based on a core xanthine structure can be evaluated for their effects on PrAO. PrAO inhibition must be considered as a potential mediator of the beneficial health effects of some methylxanthines. If inhibition in human tissues is comparable to, or greater than, that found in these studies it points to an important role for these compounds in human health.
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Affiliation(s)
- Padraig Shanahan
- Applied Enzymology Group, School of Food Science and Environmental Health, College of Science and Health, Dublin Institute of Technology, Dublin, Ireland
| | | | - Keith F Tipton
- School of Biochemistry and Immunology, Trinity College Dublin, Dublin, Ireland
| | - Gemma K Kinsella
- Applied Enzymology Group, School of Food Science and Environmental Health, College of Science and Health, Dublin Institute of Technology, Dublin, Ireland
| | - Barry J Ryan
- Applied Enzymology Group, School of Food Science and Environmental Health, College of Science and Health, Dublin Institute of Technology, Dublin, Ireland
| | - Gary T M Henehan
- Applied Enzymology Group, School of Food Science and Environmental Health, College of Science and Health, Dublin Institute of Technology, Dublin, Ireland
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18
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Inhibitory effects of agmatine on monoamine oxidase (MAO) activity: Reconciling the discrepancies. THE EUROBIOTECH JOURNAL 2018. [DOI: 10.2478/ebtj-2018-0016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Abstract
Agmatine has been functionally characterized as an important hormone and co-neurotransmitter in mammals. Given its ability in binding Imidazoline sites, a regolatory site of monoaminoxydase, it has been suggested to be involved in many neurological aspects. However, its inhibitory effect on this enzyme still remains an unanswered question. This present study is aimed to asses whether different experimental conditions could affect the agmatine action on monoaminoxydase activity. We demonstrate that the monoaminoxydase inhibition by agmatine is obtained under alkaline conditions and a long time of incubation. No inhibitiory action was found for shorter times of reaction at elevated pH, or at neutral condition and long time of incubation. No inhibition was also detected by substituting the monoamineoxydase substrate tyramine with kynuramine, however, while in these conditions a remarkable inhibition was shown by two aminoxydase inhibitors tranylcypromine and idazoxan. Herein, we discuss a mechanism model and the functional consequences of agmatine action on monoaminoxydase.
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19
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Mergemeier K, Lehr M. HPLC-UV assays for evaluation of inhibitors of mono and diamine oxidases using novel phenyltetrazolylalkanamine substrates. Anal Biochem 2018; 549:29-38. [PMID: 29550344 DOI: 10.1016/j.ab.2018.03.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 03/05/2018] [Accepted: 03/12/2018] [Indexed: 10/17/2022]
Abstract
Recently, we have described an HPLC-UV assay for the evaluation of inhibitors of plasma amine oxidase (PAO) using 6-(5-phenyl-2H-tetrazol-2-yl)hexan-1-amine (4) as a new type of substrate. Now we studied, whether this compound or homologues of it can also function as substrate for related amine oxidases, namely diamine oxidase (DAO), monoamine oxidase A (MAO A) and monoamine oxidase B (MAO B). Among these substances, 4 was converted by DAO with the highest rate. The best substrate for MAO A and B was 4-(5-phenyl-2H-tetrazol-2-yl)butan-1-amine (2). To validate the new assays, the inhibition values of known enzyme inhibitors were determined and the data were compared with those obtained with the substrate benzylamine, which is often used in amine oxidase assays. For the DAO inhibitor 2-(4-phenylphenyl)acetohydrazide an about 10fold lower IC50-value against DAO was obtained when benzylamine was applied instead of 4, indicating that 4 binds to the enzyme with higher affinity than benzylamine. The IC50-values of clorgiline and selegiline against MAO A and B, respectively, also decreased (two- and 30fold) replacing 2 by benzylamine. The discrepancies largely disappeared, when the enzymes were pre-incubated with the inhibitors for 15 min. This can be explained with the covalent inhibition mechanism of the inhibitors.
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Affiliation(s)
- Kira Mergemeier
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstrasse 48, 48149 Münster, Germany
| | - Matthias Lehr
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstrasse 48, 48149 Münster, Germany.
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20
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21
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A Xylenol Orange-Based Screening Assay for the Substrate Specificity of Flavin-Dependent para-Phenol Oxidases. Molecules 2018; 23:molecules23010164. [PMID: 29342886 PMCID: PMC6017454 DOI: 10.3390/molecules23010164] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 01/10/2018] [Accepted: 01/11/2018] [Indexed: 11/16/2022] Open
Abstract
Vanillyl alcohol oxidase (VAO) and eugenol oxidase (EUGO) are flavin-dependent enzymes that catalyse the oxidation of para-substituted phenols. This makes them potentially interesting biocatalysts for the conversion of lignin-derived aromatic monomers to value-added compounds. To facilitate their biocatalytic exploitation, it is important to develop methods by which variants of the enzymes can be rapidly screened for increased activity towards substrates of interest. Here, we present the development of a screening assay for the substrate specificity of para-phenol oxidases based on the detection of hydrogen peroxide using the ferric-xylenol orange complex method. The assay was used to screen the activity of VAO and EUGO towards a set of twenty-four potential substrates. This led to the identification of 4-cyclopentylphenol as a new substrate of VAO and EUGO and 4-cyclohexylphenol as a new substrate of VAO. Screening of a small library of VAO and EUGO active-site variants for alterations in their substrate specificity led to the identification of a VAO variant (T457Q) with increased activity towards vanillyl alcohol (4-hydroxy-3-methoxybenzyl alcohol) and a EUGO variant (V436I) with increased activity towards chavicol (4-allylphenol) and 4-cyclopentylphenol. This assay provides a quick and efficient method to screen the substrate specificity of para-phenol oxidases, facilitating the enzyme engineering of known para-phenol oxidases and the evaluation of the substrate specificity of novel para-phenol oxidases.
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22
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Ramsay RR, Tipton KF. Assessment of Enzyme Inhibition: A Review with Examples from the Development of Monoamine Oxidase and Cholinesterase Inhibitory Drugs. Molecules 2017; 22:E1192. [PMID: 28714881 PMCID: PMC6152246 DOI: 10.3390/molecules22071192] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 07/10/2017] [Accepted: 07/11/2017] [Indexed: 11/16/2022] Open
Abstract
The actions of many drugs involve enzyme inhibition. This is exemplified by the inhibitors of monoamine oxidases (MAO) and the cholinsterases (ChE) that have been used for several pharmacological purposes. This review describes key principles and approaches for the reliable determination of enzyme activities and inhibition as well as some of the methods that are in current use for such studies with these two enzymes. Their applicability and potential pitfalls arising from their inappropriate use are discussed. Since inhibitor potency is frequently assessed in terms of the quantity necessary to give 50% inhibition (the IC50 value), the relationships between this and the mode of inhibition is also considered, in terms of the misleading information that it may provide. Incorporation of more than one functionality into the same molecule to give a multi-target-directed ligands (MTDLs) requires careful assessment to ensure that the specific target effects are not significantly altered and that the kinetic behavior remains as favourable with the MTDL as it does with the individual components. Such factors will be considered in terms of recently developed MTDLs that combine MAO and ChE inhibitory functions.
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Affiliation(s)
- Rona R Ramsay
- Biomedical Sciences Research Complex, University of St Andrews, St Andrews KY16 8QP, UK.
| | - Keith F Tipton
- School of Biochemistry and Immunology, Trinity College, Dublin 2, Ireland.
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23
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Hroch L, Guest P, Benek O, Soukup O, Janockova J, Dolezal R, Kuca K, Aitken L, Smith TK, Gunn-Moore F, Zala D, Ramsay RR, Musilek K. Synthesis and evaluation of frentizole-based indolyl thiourea analogues as MAO/ABAD inhibitors for Alzheimer’s disease treatment. Bioorg Med Chem 2017; 25:1143-1152. [DOI: 10.1016/j.bmc.2016.12.029] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 12/18/2016] [Indexed: 01/03/2023]
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24
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Optimizing the preparation conditions and characterization of cross-linked enzyme aggregates of a monoamine oxidase. Food Sci Biotechnol 2016; 25:1421-1425. [PMID: 30263425 DOI: 10.1007/s10068-016-0221-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 07/19/2016] [Accepted: 07/19/2016] [Indexed: 01/20/2023] Open
Abstract
Monoamine oxidases are useful in determination of biogenic monoamines, particularly histamine and tyramine. In this study, cross-linked enzyme aggregates (CLEAs) technique was applied to improve the stability of a monoamine oxidase from Arthrobacter aurescens (AMAO). Under the optimized condition (50% of saturated ammonium sulfate, 5 mM glutaraldehyde, 2.0 mg/mL AMAO, 4 h-cross-linking at 25°C, pH 8.0), CLEAs-AMAO was recovered with a yield of 82% based on the subjected total enzyme activity. Both pH activity and stability at alkaline pHs of CLEAs-AMAO were significantly improved compared to those of the free enzyme, resulting in the shift of optimum pH to pH 8.0 and a broader pH profile. The half-life of the CLEAs at 65°C was elongated by 1.7-fold compared to that of the free enzyme, suggesting the thermal stability of AMAO was also improved by the CLEAs formation.
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25
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Knight AM, Nobili A, van den Bergh T, Genz M, Joosten HJ, Albrecht D, Riedel K, Pavlidis IV, Bornscheuer UT. Bioinformatic analysis of fold-type III PLP-dependent enzymes discovers multimeric racemases. Appl Microbiol Biotechnol 2016; 101:1499-1507. [DOI: 10.1007/s00253-016-7940-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/09/2016] [Accepted: 10/12/2016] [Indexed: 10/20/2022]
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26
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Krämer A, Herzer J, Overhage J, Meyer-Almes FJ. Substrate specificity and function of acetylpolyamine amidohydrolases from Pseudomonas aeruginosa. BMC BIOCHEMISTRY 2016; 17:4. [PMID: 26956223 PMCID: PMC4784309 DOI: 10.1186/s12858-016-0063-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 03/02/2016] [Indexed: 11/13/2022]
Abstract
Background Pseudomonas aeruginosa, a Gram-negative, aerobic coccobacillus bacterium is an opportunistic human pathogen and worldwide the fourth most common cause of hospital-acquired infections which are often high mortality such as ventilator-associated pneumoniae. The polyamine metabolism of P. aeruginosa and particularly the deacetylation of acetylpolyamines has been little studied up to now. Results with other bacterial pathogens e.g., Y. pestis suggest that polyamines may be involved in the formation of biofilms or confer resistance against certain antibiotics. Results To elucidate the role of acetylpolyamines and their enzymatic deacetylation in more detail, all three putative acetylpolyamine amidohydrolases (APAHs) from P. aeruginosa have been expressed in enzymatic active form. The APAHs PA0321 and PA1409 are shown to be true polyamine deacetylases, whereas PA3774 is not able to deacetylate acetylated polyamines. Every APAH can hydrolyze trifluoroacetylated lysine-derivatives, but only PA1409 and much more efficiently PA3774 can also process the plain acetylated lysine substrate. P. aeruginosa is able to utilize acetylcadaverine and acetylputrescine as a carbon source under glucose starvation. If either the PA0321 or the PA1409 but not the PA3774 gene is disrupted, the growth of P. aeruginosa is reduced and delayed. In addition, we were able to show that the APAH inhibitors SAHA and SATFMK induce biofilm formation in both PA14 and PAO1 wildtype strains. Conclusions P. aeruginosa has two functional APAHs, PA0321 and PA1409 which enable the utilization of acetylpolyamines for the metabolism of P. aeruginosa. In contrast, the physiological role of the predicted APAH, PA3774, remains to be elucidated. Its ability to deacetylate synthetic acetylated lysine substrates points to a protein deacetylation functionality with yet unknown substrates. Electronic supplementary material The online version of this article (doi:10.1186/s12858-016-0063-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Andreas Krämer
- Department of Chemical Engineering and Biotechnology, University of Applied Sciences, Haardtring 100, 64295, Darmstadt, Germany
| | - Jan Herzer
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, 76021, Karlsruhe, Germany
| | - Joerg Overhage
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, 76021, Karlsruhe, Germany
| | - Franz-Josef Meyer-Almes
- Department of Chemical Engineering and Biotechnology, University of Applied Sciences, Haardtring 100, 64295, Darmstadt, Germany.
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27
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Pannecoeck R, Serruys D, Benmeridja L, Delanghe JR, van Geel N, Speeckaert R, Speeckaert MM. Vascular adhesion protein-1: Role in human pathology and application as a biomarker. Crit Rev Clin Lab Sci 2015; 52:284-300. [PMID: 26287391 DOI: 10.3109/10408363.2015.1050714] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Vascular adhesion protein-1 (VAP-1) is a member of the copper-containing amine oxidase/semicarbazide-sensitive amine oxidase (AOC/SSAO) enzyme family. SSAO enzymes catalyze oxidative deamination of primary amines, which results in the production of the corresponding aldehyde, hydrogen peroxide and ammonium. VAP-1 is continuously expressed as a transmembrane glycoprotein in the vascular wall during development and facilitates the accumulation of inflammatory cells into the inflamed environment in concert with other leukocyte adhesion molecules. The soluble form of VAP-1 is released into the circulation mainly from vascular endothelial cells. Over- and under-expression of sVAP-1 result in alterations of the reported reaction product levels, which are involved in the pathogenesis of multiple human diseases. The combination of enzymatic and adhesion capacities as well as its strong association with inflammatory pathologies makes VAP-1 an interesting therapeutic target for drug discovery. In this article, we will review the general characteristics and biological functions of VAP-1, focusing on its important role as a prognostic biomarker in human pathologies. In addition, the potential therapeutic application of VAP-1 inhibitors will be discussed.
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Affiliation(s)
| | | | | | | | - Nanja van Geel
- c Department of Dermatology , Ghent University Hospital , Gent , Belgium
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28
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Chen Z, Ma Y, He M, Ren H, Zhou S, Lai D, Wang Z, Jiang L. Semi-rational Directed Evolution of Monoamine Oxidase for Kinetic Resolution of rac-Mexiletine. Appl Biochem Biotechnol 2015; 176:2267-78. [DOI: 10.1007/s12010-015-1716-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022]
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29
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Malcomson T, Yelekci K, Borrello MT, Ganesan A, Semina E, De Kimpe N, Mangelinckx S, Ramsay RR. cis-cyclopropylamines as mechanism-based inhibitors of monoamine oxidases. FEBS J 2015; 282:3190-8. [DOI: 10.1111/febs.13260] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 02/27/2015] [Accepted: 03/06/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas Malcomson
- Biomedical Sciences Research Complex; University of St Andrews; UK
| | - Kemal Yelekci
- Department of Bioinformatics and Genetics; Kadir Has University; Istanbul Turkey
| | | | - A. Ganesan
- School of Pharmacy; University of East Anglia; Norwich UK
| | - Elena Semina
- Department of Sustainable Organic Chemistry and Technology; Ghent University; Belgium
| | - Norbert De Kimpe
- Department of Sustainable Organic Chemistry and Technology; Ghent University; Belgium
| | - Sven Mangelinckx
- Department of Sustainable Organic Chemistry and Technology; Ghent University; Belgium
| | - Rona R. Ramsay
- Biomedical Sciences Research Complex; University of St Andrews; UK
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30
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Carpéné C, Bizou M, Tréguer K, Hasnaoui M, Grès S. Glitazones inhibit human monoamine oxidase but their anti-inflammatory actions are not mediated by VAP-1/semicarbazide-sensitive amine oxidase inhibition. J Physiol Biochem 2015; 71:487-96. [PMID: 25572340 DOI: 10.1007/s13105-014-0379-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/26/2014] [Indexed: 10/24/2022]
Abstract
Glitazones are peroxisome proliferator-activated receptor gamma (PPARγ) agonists widely used as antidiabetic drugs also known as thiazolidinediones. Most of them exert other effects such as anti-inflammatory actions via mechanisms supposed to be independent from PPARγ activation (e.g., decreased plasma monocyte chemoattractant protein-1 (MCP-1) levels). Recently, pioglitazone has been shown to inhibit the B form of monoamine oxidase (MAO) in mouse, while rosiglitazone and troglitazone were described as non-covalent inhibitors of both human MAO A and MAO B. Since molecules interacting with MAO might also inhibit semicarbazide-sensitive amine oxidase (SSAO), known as vascular adhesion protein-1 (VAP-1), and since VAP-1/SSAO inhibitors exhibit anti-inflammatory activity, our aim was to elucidate whether VAP-1/SSAO inhibition could be a mechanism involved in the anti-inflammatory behaviour of glitazones. To this aim, MAO and SSAO activities were measured in human subcutaneous adipose tissue biopsies obtained from overweight women undergoing plastic surgery. The production of hydrogen peroxide, an end-product of amine oxidase activity, was determined in tissue homogenates using a fluorometric method. The oxidation of 1 mM tyramine was inhibited by pargyline and almost resistant to semicarbazide, therefore predominantly MAO-dependent. Rosiglitazone was more potent than pioglitazone in inhibiting tyramine oxidation. By contrast, benzylamine oxidation was only abolished by semicarbazide: hence SSAO-mediated. Pioglitazone hampered SSAO activity only when tested at 1 mM while rosiglitazone was inefficient. However, rosiglitazone exhibited anti-inflammatory activity in human adipocytes by limiting MCP-1 expression. Our observations rule out any involvement of VAP-1/SSAO inhibition and subsequent limitation of leukocyte extravasation in the anti-inflammatory action of glitazones.
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Affiliation(s)
- Christian Carpéné
- Institut des Maladies Métaboliques et Cardiovasculaires, Institut National de la Santé et de la Recherche Médicale (INSERM U1048), Toulouse, France,
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31
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Weiß MS, Pavlidis IV, Vickers C, Höhne M, Bornscheuer UT. Glycine Oxidase Based High-Throughput Solid-Phase Assay for Substrate Profiling and Directed Evolution of (R)- and (S)-Selective Amine Transaminases. Anal Chem 2014; 86:11847-53. [DOI: 10.1021/ac503445y] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martin S. Weiß
- Institute of Biochemistry,
Department of Biotechnology and Enzyme Catalysis, Greifswald University, Felix Hausdorff-Str. 4, 17487 Greifswald, Germany
| | - Ioannis V. Pavlidis
- Institute of Biochemistry,
Department of Biotechnology and Enzyme Catalysis, Greifswald University, Felix Hausdorff-Str. 4, 17487 Greifswald, Germany
| | - Clare Vickers
- Institute of Biochemistry,
Department of Biotechnology and Enzyme Catalysis, Greifswald University, Felix Hausdorff-Str. 4, 17487 Greifswald, Germany
| | - Matthias Höhne
- Institute of Biochemistry,
Department of Biotechnology and Enzyme Catalysis, Greifswald University, Felix Hausdorff-Str. 4, 17487 Greifswald, Germany
| | - Uwe T. Bornscheuer
- Institute of Biochemistry,
Department of Biotechnology and Enzyme Catalysis, Greifswald University, Felix Hausdorff-Str. 4, 17487 Greifswald, Germany
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32
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Khiari Z, Ndagijimana M, Betti M. Low molecular weight bioactive peptides derived from the enzymatic hydrolysis of collagen after isoelectric solubilization/precipitation process of turkey by-products. Poult Sci 2014; 93:2347-62. [DOI: 10.3382/ps.2014-03953] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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33
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Esteban G, Allan J, Samadi A, Mattevi A, Unzeta M, Marco-Contelles J, Binda C, Ramsay RR. Kinetic and structural analysis of the irreversible inhibition of human monoamine oxidases by ASS234, a multi-target compound designed for use in Alzheimer's disease. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:1104-10. [PMID: 24642166 DOI: 10.1016/j.bbapap.2014.03.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 03/04/2014] [Accepted: 03/10/2014] [Indexed: 12/29/2022]
Abstract
Monoamine oxidases (MAO) and cholinesterases are validated targets in the design of drugs for the treatment of Alzheimer's disease. The multi-target compound N-((5-(3-(1-benzylpiperidin-4-yl)propoxy)-1-methyl-1H-indol-2-yl)methyl)-N-methylprop-2-yn-1-amine (ASS234), bearing the MAO-inhibiting propargyl group attached to a donepezil moiety that inhibits cholinesterases, retained activity against human acetyl- and butyryl-cholinesterases. The inhibition of MAO A and MAO B by ASS234 was characterized and compared to other known MAO inhibitors. ASS234 was almost as effective as clorgyline (kinact/KI=3×10(6) min(-1)M(-1)) and was shown by structural studies to form the same N5 covalent adduct with the FAD cofactor.
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Affiliation(s)
- Gerard Esteban
- Departamento de Bioquímica i Biología Molecular, Institute of Neuroscience, Facultat de Medicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Jennifer Allan
- Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews KY16 8QP, UK
| | - Abdelouahid Samadi
- Laboratorio de Química Medica (IQOG, CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain
| | - Andrea Mattevi
- Department of Biology and Biotechnology, University of Pavia, Pavia 27100, Italy
| | - Mercedes Unzeta
- Departamento de Bioquímica i Biología Molecular, Institute of Neuroscience, Facultat de Medicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - José Marco-Contelles
- Laboratorio de Química Medica (IQOG, CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain
| | - Claudia Binda
- Department of Biology and Biotechnology, University of Pavia, Pavia 27100, Italy.
| | - Rona R Ramsay
- Biomedical Sciences Research Complex, University of St Andrews, North Haugh, St Andrews KY16 8QP, UK.
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34
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Lee JI, Oh YK, Kim JH, Kim YW. Rapid enzymatic assay of biogenic amines in Doenjang and Gochujang using amine oxidase. Food Sci Biotechnol 2013. [DOI: 10.1007/s10068-013-0194-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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35
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Foot JS, Yow TT, Schilter H, Buson A, Deodhar M, Findlay AD, Guo L, McDonald IA, Turner CI, Zhou W, Jarolimek W. PXS-4681A, a Potent and Selective Mechanism-Based Inhibitor of SSAO/VAP-1 with Anti-Inflammatory Effects In Vivo. J Pharmacol Exp Ther 2013; 347:365-74. [DOI: 10.1124/jpet.113.207613] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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36
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Grès S, Canteiro S, Mercader J, Carpéné C. Oxidation of high doses of serotonin favors lipid accumulation in mouse and human fat cells. Mol Nutr Food Res 2013; 57:1089-99. [DOI: 10.1002/mnfr.201200681] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 12/04/2012] [Accepted: 12/21/2012] [Indexed: 01/25/2023]
Affiliation(s)
| | - Sarah Canteiro
- Institut des Maladies Métaboliques et Cardiovasculaires (I2MC); Université de Toulouse; UPS; Toulouse; France
| | - Josep Mercader
- Institut National de la Santé et de la Recherche Médicale; INSERM U1048; Toulouse; France
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37
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Characterization of amine oxidases from Arthrobacter aurescens and application for determination of biogenic amines. World J Microbiol Biotechnol 2012; 29:673-82. [DOI: 10.1007/s11274-012-1223-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Accepted: 11/28/2012] [Indexed: 10/27/2022]
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38
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Li KK, Luo C, Wang D, Jiang H, Zheng YG. Chemical and biochemical approaches in the study of histone methylation and demethylation. Med Res Rev 2012; 32:815-67. [PMID: 22777714 DOI: 10.1002/mrr.20228] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Histone methylation represents one of the most critical epigenetic events in DNA function regulation in eukaryotic organisms. Classic molecular biology and genetics tools provide significant knowledge about mechanisms and physiological roles of histone methyltransferases and demethylases in various cellular processes. In addition to this stream line, development and application of chemistry and chemistry-related techniques are increasingly involved in biological study, and offer information otherwise difficult to obtain by standard molecular biology methods. Herein, we review recent achievements and progress in developing and applying chemical and biochemical approaches in the study of histone methylation, including chromatin immunoprecipitation, chemical ligation, mass spectrometry, biochemical methylation and demethylation assays, and inhibitor development. These technological advances allow histone methylation to be studied from genome-wide level to molecular and atomic levels. With ChIP technology, information can be obtained about precise mapping of histone methylation patterns at specific promoters, genes, or other genomic regions. MS is particularly useful in detecting and analyzing methylation marks in histone and nonhistone protein substrates. Chemical approaches that permit site-specific incorporation of methyl groups into histone proteins greatly facilitate the investigation of biological impacts of methylation at individual modification sites. Discovery and design of selective organic inhibitors of histone methyltransferases and demethylases provide chemical probes to interrogate methylation-mediated cellular pathways. Overall, these chemistry-related technological advances have greatly improved our understanding of the biological functions of histone methylation in normal physiology and diseased states, and also are of great potential to translate basic epigenetics research into diagnostic and therapeutic applications in the clinic.
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Affiliation(s)
- Keqin Kathy Li
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
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39
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Mazzio E, Deiab S, Park K, Soliman KFA. High throughput screening to identify natural human monoamine oxidase B inhibitors. Phytother Res 2012; 27:818-28. [PMID: 22887993 DOI: 10.1002/ptr.4795] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 07/15/2012] [Indexed: 02/06/2023]
Abstract
Age-related increase in monoamine oxidase B (MAO-B) may contribute to CNS neurodegenerative diseases. Moreover, MAO-B inhibitors are used in the treatment of idiopathic Parkinson disease as preliminary monotherapy or adjunct therapy with L-dopa. To date, meager natural sources of MAO-B inhibitors have been identified, and the relative strength, potency and rank of many plants relative to standard drugs such as Selegiline (L-deprenyl,Eldepryl) are not known. In this work, we developed and utilized a high throughput enzyme microarray format to screen and evaluate 905 natural product extracts (0.025-.7 mg/ml) to inhibit human MAO-B derived from BTI-TN-5B1-4 cells infected with recombinant baculovirus. The protein sequence of purified enzyme was confirmed using 1D gel electrophoresis-matrix assisted laser desorption ionization -time-of-flight-tandem mass spectroscopy, and enzyme activity was confirmed by [1] substrate conversion (3-mM benzylamine) to H202 and [2] benzaldehyde. Of the 905 natural extracts tested, the lowest IC50s [<0.07 mg/ml] were obtained with extracts of Amur Corktree (Phellodendron amurense), Bakuchi Seed(Cyamopsis psoralioides), Licorice Root (Glycyrrhiza glabra/uralensis), Babchi (Psoralea corylifolia seed). The data also show, albeit to a lesser extent, inhibitory properties of herbs originating from the mint family (Lamiaceae) and Turmeric, Comfrey, Bringraj, Skullcap, Kava-kava, Wild Indigo, Gentian and Green Tea. In conclusion, the data reflect relative potency information by rank of commonly used herbs and plants that contain human MAO-B inhibitory properties in their natural form.
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Affiliation(s)
- E Mazzio
- College of Pharmacy and Pharmaceutical Sciences, Florida A & M University, Tallahassee, Florida 32307, USA
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40
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Characterization of the in vitro binding and inhibition kinetics of primary amine oxidase/vascular adhesion protein-1 by glucosamine. Biochim Biophys Acta Gen Subj 2011; 1820:482-7. [PMID: 22202180 DOI: 10.1016/j.bbagen.2011.12.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 11/15/2011] [Accepted: 12/09/2011] [Indexed: 02/07/2023]
Abstract
BACKGROUND Primary-amine oxidase (PrAO) catalyzes the oxidative deamination of endogenous and exogenous primary amines and also functions, in some tissues, as an inflammation-inducible endothelial factor, known as vascular adhesion protein-1. VAP-1 mediates the slow rolling and adhesion of lymphocytes to endothelial cells in a number of inflammatory conditions, including inflammation of the synovium. METHODS Glucosamine binding to the enzyme was assessed spectrofluorometrically and the kinetics of inhibition of PrAO were determined spectrophotometrically through the use of direct or coupled assays, in the presence of different substrates. RESULTS Glucosamine is not a substrate for PrAO, but acts as a time-dependent inhibitor of PrAO activity, displaying mixed inhibition kinetics. The observed inhibition and binding were augmented in the presence of H(2)O(2). CONCLUSIONS Significant in vitro effects on PrAO require glucosamine in the millimolar concentration range and it is not clear at this stage whether a low but persistent level of PrAO inhibition might contribute to the anti-arthritic response. GENERAL SIGNIFICANCE This work was aimed at characterizing the interactions of PrAO/VAP-1 with glucosamine, a widely used "over-the-counter" supplement for the treatment of osteoarthritis.
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41
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Aalto K, Maksimow M, Juonala M, Viikari J, Jula A, Kähönen M, Jalkanen S, Raitakari OT, Salmi M. Soluble vascular adhesion protein-1 correlates with cardiovascular risk factors and early atherosclerotic manifestations. Arterioscler Thromb Vasc Biol 2011; 32:523-32. [PMID: 22116093 DOI: 10.1161/atvbaha.111.238030] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVE Vascular adhesion protein-1 is an endothelial enzyme that regulates leukocyte traffic and contributes to vascular damage in animal models. The relations of soluble vascular adhesion protein-1 (sVAP-1) with cardiovascular risk factors and markers of subclinical atherosclerosis at a population level have not been studied. METHODS AND RESULTS We developed a new high-throughput method and measured sVAP-1 activities in serum of 2183 persons (The Cardiovascular Risk in Young Finns Study). In women, sVAP-1 activity correlated indirectly with body mass index (r=-0.15, P<0.0001), triglycerides (r=-0.13, P<0.0001), C-reactive protein (r=-0.23; P<0.0001), and brachial artery flow-mediated vasodilatation (r=-0.076, P=0.0089) and directly with carotid plaques (r=0.066, P=0.023). None of these correlations was significant in men. In women, all these univariate correlations remained significant after adjustment for body mass index, and direct correlations with LDL-cholesterol (r=0.094, P=0.0014) and carotid intima-media thickness (r=0.075, P=0.010) became evident. In men, sVAP-1 activity associated directly with glucose (r=0.074, P=0.020), intima-media thickness (r=0.072, P=0.025), metabolic syndrome (P=0.016), and type 1 (P=0.0002) and type 2 (P<0.0001) diabetes. In multivariable analyses, sVAP-1 activity was an independent determinant of carotid intima-media thickness (P=0.0072) and plaques [odds ratio 1.71 (95% confidence interval 1.07-2.72, P=0.025] in women, but not in men. CONCLUSIONS sVAP-1 activity correlates directly with intima-media thickness and carotid plaques in general population and may play a role in the pathophysiology of preclinical atherosclerosis.
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Affiliation(s)
- Kristiina Aalto
- MediCity Research Laboratory, Tykistökatu 6A, 20520 Turku, Finland
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42
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Peet GW, Lukas S, Hill-Drzewi M, Martin L, Rybina IV, Roma T, Shoultz A, Zhu X, Cazacu D, Kronkaitis A, Baptiste A, Raudenbush BC, August EM, Modis LK. Bioluminescent Method for Assaying Multiple Semicarbazide-Sensitive Amine Oxidase (SSAO) Family Members in Both 96- and 384-Well Formats. ACTA ACUST UNITED AC 2011; 16:1106-11. [DOI: 10.1177/1087057111414897] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Vascular adhesion protein–1 (VAP-1), also known as semicarbazide-sensitive amine oxidase (SSAO) or copper-containing amine oxidase (AOC3, EC 1.4.3.6), catalyzes oxidative deamination of primary amines. One endogenous substrate has recently been described (Siglec 10), and although its mechanism of action in vivo is not completely understood, it is suggested to play a role in immune cell trafficking, making it a target of interest for autoimmune and inflammatory diseases. Much of the enzymology performed around this target has been conducted with absorbance, fluorescent, or radiometric formats that can have some limitations for high-throughput screening and subsequent compound profiling. The authors present the use of a bioluminescent assay, originally developed for monoamine oxidase enzymes, in a high-throughput format. It can be used for related SSAOs such as AOC1 given their substrate similarity with VAP-1. The authors also demonstrate that it is compatible with different sources of VAP-1, both purified recombinant and VAP-1 overexpressed on live cells.
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Affiliation(s)
| | - Susan Lukas
- Boehringer Ingelheim Pharmaceuticals, Ridgefield, CT, USA
| | | | - Leslie Martin
- Boehringer Ingelheim Pharmaceuticals, Ridgefield, CT, USA
| | | | - Teresa Roma
- Boehringer Ingelheim Pharmaceuticals, Ridgefield, CT, USA
| | - Alycia Shoultz
- Boehringer Ingelheim Pharmaceuticals, Ridgefield, CT, USA
| | - Xiang Zhu
- Boehringer Ingelheim Pharmaceuticals, Ridgefield, CT, USA
| | - Daniela Cazacu
- Boehringer Ingelheim Pharmaceuticals, Ridgefield, CT, USA
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43
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Ramsay RR, Olivieri A, Holt A. An improved approach to steady-state analysis of monoamine oxidases. J Neural Transm (Vienna) 2011; 118:1003-19. [DOI: 10.1007/s00702-011-0657-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Accepted: 05/05/2011] [Indexed: 11/30/2022]
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44
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Olivieri A, Tipton K. Inhibition of bovine plasma semicarbazide-sensitive amine oxidase by caffeine. J Biochem Mol Toxicol 2011; 25:26-7. [PMID: 21322095 DOI: 10.1002/jbt.20356] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Semicarbazide-sensitive amine oxidase (SSAO) is a copper-containing enzyme that catalyzes the oxidative deamination of endogenous and exogenous primary amines. SSAO exists in mammals both as a plasma-soluble and as a membrane-bound form, and its active site is able to come into contact with numerous xenobiotic, amine-containing compounds. The kinetic studies performed in this work showed that caffeine inhibition of bovine serum amine oxidase was noncompetitive when benzylamine was used as substrate and mixed when the substrate used was methylamine. Since caffeine contains an imidazole ring, it cannot be excluded that it might bind to an inhibitory imidazoline-binding site on SSAO.
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Affiliation(s)
- A Olivieri
- School of Biochemistry and Immunology, Trinity College, Dublin 2, Ireland.
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45
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Lombardi PM, Angell HD, Whittington DA, Flynn EF, Rajashankar KR, Christianson DW. Structure of prokaryotic polyamine deacetylase reveals evolutionary functional relationships with eukaryotic histone deacetylases. Biochemistry 2011; 50:1808-17. [PMID: 21268586 PMCID: PMC3074186 DOI: 10.1021/bi101859k] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Polyamines are a ubiquitous class of polycationic small molecules that can influence gene expression by binding to nucleic acids. Reversible polyamine acetylation regulates nucleic acid binding and is required for normal cell cycle progression and proliferation. Here, we report the structures of Mycoplana ramosa acetylpolyamine amidohydrolase (APAH) complexed with a transition state analogue and a hydroxamate inhibitor and an inactive mutant complexed with two acetylpolyamine substrates. The structure of APAH is the first of a histone deacetylase-like oligomer and reveals that an 18-residue insert in the L2 loop promotes dimerization and the formation of an 18 Å long "L"-shaped active site tunnel at the dimer interface, accessible only to narrow and flexible substrates. The importance of dimerization for polyamine deacetylase function leads to the suggestion that a comparable dimeric or double-domain histone deacetylase could catalyze polyamine deacetylation reactions in eukaryotes.
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Affiliation(s)
- Patrick M. Lombardi
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323 USA
| | - Heather D. Angell
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323 USA
| | - Douglas A. Whittington
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323 USA
| | - Erin F. Flynn
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323 USA
| | - Kanagalaghatta R. Rajashankar
- NE-CAT, Department of Chemistry and Chemical Biology, Cornell University, Building 436E, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439
| | - David W. Christianson
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, PA 19104-6323 USA
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46
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Olivieri A, Rico D, Khiari Z, Henehan G, O'Sullivan J, Tipton K. From caffeine to fish waste: amine compounds present in food and drugs and their interactions with primary amine oxidase. J Neural Transm (Vienna) 2011; 118:1079-89. [PMID: 21373760 DOI: 10.1007/s00702-011-0611-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Accepted: 02/16/2011] [Indexed: 12/29/2022]
Abstract
Tissue bound primary amine oxidase (PrAO) and its circulating plasma-soluble form are involved, through their catalytic activity, in important cellular roles, including the adhesion of lymphocytes to endothelial cells during various inflammatory conditions, the regulation of cell growth and maturation, extracellular matrix deposition and maturation and glucose transport. PrAO catalyses the oxidative deamination of several xenobiotics and has been linked to vascular toxicity, due to the generation of cytotoxic aldehydes. In this study, a series of amines and aldehydes contained in food and drugs were tested via a high-throughput assay as potential substrates or inhibitors of bovine plasma PrAO. Although none of the compounds analyzed were found to be substrates for the enzyme, a series of molecules, including caffeine, the antidiabetics phenformin and tolbutamide and the antimicrobial pentamidine, were identified as PrAO inhibitors. Although the inhibition observed was in the millimolar and micromolar range, these data show that further work will be necessary to elucidate whether the interaction of ingested biogenic or xenobiotic amines with PrAO might adversely affect its biological roles.
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Affiliation(s)
- Aldo Olivieri
- School of Biochemistry and Immunology, Trinity College, Dublin 2, Ireland.
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47
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Li KK, Luo C, Wang D, Jiang H, Zheng YG. Chemical and biochemical approaches in the study of histone methylation and demethylation. Med Res Rev 2010. [DOI: 10.1002/med.20228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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48
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McDonald GR, Olivieri A, Ramsay RR, Holt A. On the formation and nature of the imidazoline I2 binding site on human monoamine oxidase-B. Pharmacol Res 2010; 62:475-88. [PMID: 20832472 DOI: 10.1016/j.phrs.2010.09.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 08/31/2010] [Accepted: 09/01/2010] [Indexed: 11/24/2022]
Abstract
An allosteric binding site with high affinity for imidazoline I(2) ligands has been proposed to exist on monoamine oxidase-B (MAO-B). However, enzyme inhibition only occurs at ligand concentrations far higher than are required to saturate this site. We here confirm previous reports that inactivation of recombinant human MAO-B with tranylcypromine results in the formation of a high affinity I(2) site on the enzyme, measured as an increase in binding of [(3)H]2-BFI. Incubation of MAO-B with 2-phenylethylamine, an endogenous trace amine and MAO-B substrate, resulted in a progressive loss of enzyme activity, increased enzyme mass, distinct spectral changes and, as was observed with tranylcypromine, a parallel increase in high affinity binding of [(3)H]2-BFI. Kinetic studies of the mechanism by which 2-BFI inhibits MAO-B activity suggested binding of 2-BFI, at micromolar concentrations, to a site distinct from the active site on at least two forms of the pure enzyme, probably corresponding to oxidised and reduced enzyme states. Studies with mutant enzymes revealed a pattern of changes consistent with binding of 2-BFI to the substrate entrance channel of human MAO-B. Structural data confirm that high affinity binding of I(2) ligands occurs within the entrance channel of inactive enzyme, while lower affinity binding at the same location in catalytically active enzyme results in mixed inhibition of MAO-B activity. High affinity I(2) sites may form in vivo due to inactivation of a portion of MAO-B during amine oxidation, while the low affinity I(2) site on active enzyme is a target for novel MAO-B inhibitor drugs.
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Affiliation(s)
- G Reid McDonald
- Department of Pharmacology, School of Molecular and Systems Medicine, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
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49
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Schätzle S, Höhne M, Robins K, Bornscheuer UT. Conductometric method for the rapid characterization of the substrate specificity of amine-transaminases. Anal Chem 2010; 82:2082-6. [PMID: 20148590 DOI: 10.1021/ac9028483] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amine-transaminases (ATAs, omega-transaminases, omega-TA) are PLP-dependent enzymes that catalyze amino group transfer reactions. In contrast to the widespread and well-known amino acid-transaminases, ATAs are able to convert substrates lacking an alpha-carboxylic functional group. They have gained increased attention because of their potential for the asymmetric synthesis of optically active amines, which are frequently used as building blocks for the preparation of numerous pharmaceuticals. Having already introduced a fast kinetic assay based on the conversion of the model substrate alpha-methylbenzylamine for the characterization of the amino acceptor specificity, we now report on a kinetic conductivity assay for investigating the amino donor specificity of a given ATA. The course of an ATA-catalyzed reaction can be followed conductometrically since the conducting substrates, a positively charged amine and a negatively charged keto acid, are converted to nonconducting products, a noncharged ketone and a zwitterionic amino acid. The decrease of conductivity for the investigated reaction systems were determined to be 33-52 microS mM(-1). In contrast to other ATA-assays previously described, with this approach all transamination reactions between any amine and any keto acid can be monitored without the need for an additional enzyme or staining solutions. The assay was used for the characterization of a ATA from Rhodobacter sphaeroides, and the data obtained were in excellent agreement with gas chromatography analysis.
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Affiliation(s)
- Sebastian Schätzle
- Institute of Biochemistry, Department of Biotechnology and Enzyme Catalysis, Greifswald University, Felix Hausdorff-Strasse 4, 17487 Greifswald, Germany
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Olivieri A, O'Sullivan J, Fortuny LRA, Vives IL, Tipton KF. Interaction of l-lysine and soluble elastin with the semicarbazide-sensitive amine oxidase in the context of its vascular-adhesion and tissue maturation functions. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1804:941-7. [DOI: 10.1016/j.bbapap.2010.01.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2009] [Revised: 01/06/2010] [Accepted: 01/07/2010] [Indexed: 11/24/2022]
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