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Leveridge M, Collier L, Edge C, Hardwicke P, Leavens B, Ratcliffe S, Rees M, Stasi LP, Nadin A, Reith AD. A High-Throughput Screen to Identify LRRK2 Kinase Inhibitors for the Treatment of Parkinson’s Disease Using RapidFire Mass Spectrometry. ACTA ACUST UNITED AC 2015; 21:145-55. [DOI: 10.1177/1087057115606707] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 08/07/2015] [Indexed: 12/12/2022]
Abstract
LRRK2 is a large multidomain protein containing two functional enzymatic domains: a GTPase domain and a protein kinase domain. Dominant coding mutations in the LRRK2 protein are associated with Parkinson’s disease (PD). Among such pathogenic mutations, Gly2019Ser mutation in the LRRK2 kinase domain is the most frequent cause of familial PD in Caucasians and is also found in some apparently sporadic PD cases. This mutation results in 2- to 3-fold elevated LRRK2 kinase activity compared with wild type, providing a clear clinical hypothesis for the application of kinase inhibitors in the treatment of this disease. To date, reported screening assays for LRRK2 have been based on detection of labeled adenosine triphosphate and adenosine diphosphate or on antibody-based detection of phosphorylation events. While these assays do offer a high-throughput method of monitoring LRRK2 kinase activity, they are prone to interference from autofluorescent compounds and nonspecific events. Here we describe a label-free assay for LRRK2 kinase activity using the RapidFire mass spectrometry system. This assay format was found to be highly robust and enabled a screen of 100,000 lead-like small molecules. The assay successfully identified a number of known LRRK2 chemotypes that met stringent physicochemical criteria.
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Affiliation(s)
- Melanie Leveridge
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Lee Collier
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
- Cancer Research Technology, Babraham Research Campus, Cambridge, UK
| | - Colin Edge
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Phil Hardwicke
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Bill Leavens
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Steve Ratcliffe
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Mike Rees
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Luigi Piero Stasi
- Neurodegeneration DPU, Neurosciences Therapy Area Unit, GlaxoSmithKline, Pharmaceuticals R&D, Hertfordshire, UK, and Pudong, China
- Nuevolution A/S, Rønnegade 8, DK-2100 Copenhagen, Denmark
| | - Alan Nadin
- Department of Platform Technology and Science, GlaxoSmithKline Pharmaceuticals R&D, Hertfordshire, UK
| | - Alastair D. Reith
- Neurodegeneration DPU, Neurosciences Therapy Area Unit, GlaxoSmithKline, Pharmaceuticals R&D, Hertfordshire, UK, and Pudong, China
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Lowe DM, Gee M, Haslam C, Leavens B, Christodoulou E, Hissey P, Hardwicke P, Argyrou A, Webster SP, Mole DJ, Wilson K, Binnie M, Yard BA, Dean T, Liddle J, Uings I, Hutchinson JP. Lead discovery for human kynurenine 3-monooxygenase by high-throughput RapidFire mass spectrometry. ACTA ACUST UNITED AC 2013; 19:508-15. [PMID: 24381207 DOI: 10.1177/1087057113518069] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Kynurenine 3-monooxygenase (KMO) is a therapeutically important target on the eukaryotic tryptophan catabolic pathway, where it converts L-kynurenine (Kyn) to 3-hydroxykynurenine (3-HK). We have cloned and expressed the human form of this membrane protein as a full-length GST-fusion in a recombinant baculovirus expression system. An enriched membrane preparation was used for a directed screen of approximately 78,000 compounds using a RapidFire mass spectrometry (RF-MS) assay. The RapidFire platform provides an automated solid-phase extraction system that gives a throughput of approximately 7 s per well to the mass spectrometer, where direct measurement of both the substrate and product allowed substrate conversion to be determined. The RF-MS methodology is insensitive to assay interference, other than where compounds have the same nominal mass as Kyn or 3-HK and produce the same mass transition on fragmentation. These instances could be identified by comparison with the product-only data. The screen ran with excellent performance (average Z' value 0.8) and provided several tractable hit series for further investigation.
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Affiliation(s)
- Denise M Lowe
- 1Department of Biological Sciences, GlaxoSmithKline, Stevenage, UK
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3
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Leveridge M, Buxton R, Argyrou A, Francis P, Leavens B, West A, Rees M, Hardwicke P, Bridges A, Ratcliffe S, Chung CW. Demonstrating Enhanced Throughput of RapidFire Mass Spectrometry through Multiplexing Using the JmjD2d Demethylase as a Model System. ACTA ACUST UNITED AC 2013; 19:278-86. [DOI: 10.1177/1087057113496276] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Using mass spectrometry to detect enzymatic activity offers several advantages over fluorescence-based methods. Automation of sample handling and analysis using platforms such as the RapidFire (Agilent Technologies, Lexington, MA) has made these assays amenable to medium-throughput screening (of the order of 100,000 wells). However, true high-throughput screens (HTS) of large compound collections (>1 million) are still considered too time-consuming to be feasible. Here we propose a simple multiplexing strategy that can be used to increase the throughput of RapidFire, making it viable for HTS. The method relies on the ability to analyze pooled samples from several reactions simultaneously and to deconvolute their origin using “mass-tagged” substrates. Using the JmjD2d H3K9me3 demethylase as a model system, we demonstrate the practicality of this method to achieve a 4-fold increase in throughput. This was achieved without any loss of assay quality. This multiplex strategy could easily be scaled to give even greater reductions in analysis time.
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Affiliation(s)
- Melanie Leveridge
- Department of Screening and Compound Profiling, GlaxoSmithKline, Stevenage, UK
| | - Rachel Buxton
- Biological Reagents and Assay Development, GlaxoSmithKline, Stevenage, UK
| | - Argyrides Argyrou
- Biological Reagents and Assay Development, GlaxoSmithKline, Stevenage, UK
| | - Peter Francis
- Computational and Structural Chemistry, GlaxoSmithKline, Stevenage, UK
| | - Bill Leavens
- Computational and Structural Chemistry, GlaxoSmithKline, Stevenage, UK
| | - Andy West
- Computational and Structural Chemistry, GlaxoSmithKline, Stevenage, UK
| | - Mike Rees
- Biological Reagents and Assay Development, GlaxoSmithKline, Stevenage, UK
| | - Philip Hardwicke
- Biological Reagents and Assay Development, GlaxoSmithKline, Stevenage, UK
| | - Angela Bridges
- Biological Reagents and Assay Development, GlaxoSmithKline, Stevenage, UK
| | - Steven Ratcliffe
- Computational and Structural Chemistry, GlaxoSmithKline, Stevenage, UK
| | - Chun-wa Chung
- Computational and Structural Chemistry, GlaxoSmithKline, Stevenage, UK
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Hutchinson SE, Leveridge MV, Heathcote ML, Francis P, Williams L, Gee M, Munoz-Muriedas J, Leavens B, Shillings A, Jones E, Homes P, Baddeley S, Chung CW, Bridges A, Argyrou A. Enabling Lead Discovery for Histone Lysine Demethylases by High-Throughput RapidFire Mass Spectrometry. ACTA ACUST UNITED AC 2011; 17:39-48. [DOI: 10.1177/1087057111416660] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A high-throughput RapidFire mass spectrometry assay is described for the JMJD2 family of Fe2+, O2, and α-ketoglutarate-dependent histone lysine demethylases. The assay employs a short amino acid peptide substrate, corresponding to the first 15 amino acid residues of histone H3, but mutated at two positions to increase assay sensitivity. The assay monitors the direct formation of the dimethylated-Lys9 product from the trimethylated-Lys9 peptide substrate. Monitoring the formation of the monomethylated and des-methylated peptide products is also possible. The assay was validated using known inhibitors of the histone lysine demethylases, including 2,4-pyridinedicarboxylic acid and an α-ketoglutarate analogue. With a sampling rate of 7 s per well, the RapidFire technology permitted the single-concentration screening of 101 226 compounds against JMJD2C in 10 days using two instruments, typically giving Z′ values of 0.75 to 0.85. Several compounds were identified of the 8-hydroxyquinoline chemotype, a known series of inhibitors of the Lys9-specific histone demethylases. The peptide also functions as a substrate for JMJD2A, JMJD2D, and JMJD2E, thus enabling the development of assays for all 3 enzymes to monitor progress in compound selectivity. The assay represents the first report of a RapidFire mass spectrometry assay for an epigenetics target.
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Affiliation(s)
| | | | | | | | - Laura Williams
- Departments of Biological Reagents and Assay Development
| | | | | | - Bill Leavens
- Analytical Chemistry, Platform Technology and Science, GlaxoSmithKline, Stevenage, UK
| | | | - Emma Jones
- Departments of Biological Reagents and Assay Development
| | - Paul Homes
- Departments of Biological Reagents and Assay Development
| | | | | | - Angela Bridges
- Departments of Biological Reagents and Assay Development
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Marshall PS, Leavens B, Heudi O, Ramirez-Molina C. Liquid chromatography coupled with inductively coupled plasma mass spectrometry in the pharmaceutical industry: selected examples. J Chromatogr A 2004; 1056:3-12. [PMID: 15595526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Both LC and capillary LC (CapLC) have been successfully interfaced with inductively coupled plasma mass spectrometry (ICP-MS). Gradients of acetonitrile and aqueous based solvents have been employed to separate several compounds of pharmaceutical interest. This paper will describe four application areas in the pharmaceutical industry, and examples will be shown where CapLC, LC and gel electrophoresis via laser ablation have been coupled with ICP-MS. The four areas highlighted in this paper are: (1) the use of derivatisation reactions to "make the invisible visible". Methods involving derivatisations with copper and iron will be described that can be used for the analysis of amines and carboxylic acids by ICP-MS. (2) The profiling of metal ion content (in particular bromine) in biological samples such as human plasma, this study will focus on the metabolism of bromine-labelled peptides (e.g. substance P). (3) The analysis of materials derived from single, solid-phase beads used in combinatorial chemistry, and (4) also discussed will be our findings from investigations into the use of laser ablation ICP-MS on the determination of protein phosphorylation on electrophoresis gel blots.
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Affiliation(s)
- Peter S Marshall
- Bioanalytical Sciences, CASS, GlaxoSmithKline, Gunnels Wood Road, Stevenage SG1 2NY, UK.
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Spikmans V, Lane SJ, Leavens B, Manz A, Smith NW. On-line on-chip post-column derivatisation reactions for pre-ionisation of analytes and cluster analysis in gradient micro-liquid chromatography/electrospray mass spectrometry. Rapid Commun Mass Spectrom 2002; 16:1377-1388. [PMID: 12112618 DOI: 10.1002/rcm.727] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A system is presented that demonstrates the principle of on-line and on-chip post-column derivatisation reactions in micro-high-performance liquid chromatography (micro-HPLC) hyphenated to electrospray time-of-flight mass spectrometry (ESI-TOFMS). In this micro-HPLC-chip-MS set-up, the analytes are separated using gradient micro-HPLC and subsequently derivatised on-chip and detected. One of the major limitations of MS detection is its dependency on the degree of ionisation, which is widely variable and compound-specific. Optimising and controlling the degree of ionisation in a simple manner would allow MS detection to be truly generic. One way of achieving this is by pre-ionisation of analytes using simple derivatisation procedures that are both rapid and quantitative. Performing this in situ on the system described here overcomes issues of sample handling and efficiency losses when time-consuming "bench chemistry" is necessary prior to analysis. The power of the system is demonstrated by the separation of primary and secondary amines, which are subsequently derivatised with a positively charged phosphonium complex and detected in an enhanced manner. Typically, molecular cations (M(+)) are detected showing that the ionisation process is dominated by the phosphonium species, leading to more constant ionisation for a variety of compounds. In addition, stable isotopically labelled ((12)C/(13)C)-phosphonium reagent is used for the reactions, allowing for inherent signal/noise (S/N) improvement and automated data processing using cluster analysis. A similar reaction scheme is used for the derivatisation of ketones and aldehydes, also demonstrating dramatic increases in sensitivity, especially with increasing temperature. Minimal loss in chromatographic fidelity in terms of retention times is observed by the introduction of the micromixer chip into the system. Optimal flow rates in micro-HPLC and ESI-MS are compatible with flow rates for the chip as well as a multitude of in-line optical detectors including UV and fluorescence. In addition, the micromixer chip can be positioned pre-column if preferred. The system is robust, easily fully automated and applicable to a wide variety of reactions. The system has a major advantage in its simple robust connection to the "normal scale" outside world.
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Affiliation(s)
- Valerie Spikmans
- AstraZeneca/SmithKline Beecham Centre for Analytical Sciences, Department of Chemistry, Imperial College of Science, Technology and Medicine, South Kensington, London SW7 2AY, UK.
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Leavens B. Response to letter regarding vaccination of cats. J Am Vet Med Assoc 1998; 212:1539-41. [PMID: 9604017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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