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Journal articleBenns HJ, Wincott CJ, Tate EW, et al., 2020,
Activity- and reactivity-based proteomics: Recent technological advances and applications in drug discovery.
, Current Opinion in Chemical Biology, Vol: 60, Pages: 20-29, ISSN: 1367-5931Activity-based protein profiling (ABPP) is recognized as a powerful and versatile chemoproteomic technology in drug discovery. Central to ABPP is the use of activity-based probes to report the activity of specific enzymes or reactivity of amino acid types in complex biological systems. Over the last two decades, ABPP has facilitated the identification of new drug targets and discovery of lead compounds in human and infectious disease. Furthermore, as part of a sustained global effort to illuminate the druggable proteome, the repertoire of target classes addressable with activity-based probes has vastly expanded in recent years. Here, we provide an overview of ABPP and summarise the major technological advances with an emphasis on probe development.
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Journal articleBell AS, Yu Z, Hutton JA, et al., 2020,
Novel thienopyrimidine inhibitors of Leishmania N-myristoyltransferase with on-target activity in intracellular amastigotes
, Journal of Medicinal Chemistry, Vol: 14, Pages: 7740-7765, ISSN: 0022-2623The leishmaniases, caused by Leishmania species of protozoan parasites, are neglected tropical diseases with 12-15 million cases worldwide. Current therapeutic approaches are limited by toxicity, resistance and cost. N-Myristoyltransferase (NMT), an enzyme ubiquitous and essential in all eukaryotes, has been validated via genetic and pharmacological methods as a promising antileishmanial target. Here we describe a comprehensive structure activity relationship study of a thienopyrimidine series previously identified in a high throughput screen against Leishmania NMT, across 68 compounds in enzyme- and cell-based assay formats. Using a chemical tagging target engagement biomarker assay we identify the first inhibitor in this series with on-target NMT activity in leishmania parasites. Furthermore, crystal structure analyses of 12 derivatives in complex with Leishmania major NMT revealed key factors important for future structure-guided optimization delivering IMP-105 (43), a compound with modest activity against L. donovani intracellular amastigotes and excellent selectivity (>660-fold) for Leishmania NMT over human NMTs.
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Journal articlePanyain N, Godinat A, Lanyon-Hogg T, et al., 2020,
Discovery of a potent and selective covalent inhibitor and activity-based probe for the deubiquitylating enzyme UCHL1, with anti-fibrotic activity
, Journal of the American Chemical Society, Vol: 142, Pages: 12020-12026, ISSN: 0002-7863Ubiquitin carboxy-terminal hydrolase L1 (UCHL1) is a deubiquitylating enzyme which is proposed as a potential therapeutic target in neurodegeneration, cancer, and liver and lung fibrosis. Herein we report the discovery of the most potent and selective UCHL1 probe (IMP-1710) to date based on a covalent inhibitor scaffold and apply this probe to identify and quantify target proteins in intact human cells. IMP-1710 stereoselectively labels the catalytic cysteine of UCHL1 at low nanomolar concentration in cells. We further demonstrate that potent and selective UCHL1 inhibitors block pro-fibrotic responses in a cellular model of idiopathic pulmonary fibrosis, supporting the potential of UCHL1 as a potential therapeutic target in fibrotic diseases.
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Journal articleAlzahofi N, Welz T, Robinson CL, et al., 2020,
Rab27a co-ordinates actin-dependent transport by controlling organelle-associated motors and track assembly proteins
, NATURE COMMUNICATIONS, Vol: 11, ISSN: 2041-1723- Author Web Link
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- Citations: 16
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Journal articleBroncel M, Dominicus C, Vigetti L, et al., 2020,
Profiling of myristoylation in <i>Toxoplasma</i> <i>gondii</i> reveals an <i>N</i>-myristoylated protein important for host cell penetration
, ELIFE, Vol: 9, ISSN: 2050-084X- Author Web Link
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- Citations: 12
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Journal articleManeiro M, Forte N, Shchepinova MM, et al., 2020,
Antibody–PROTAC conjugates enable HER2-dependent targeted protein degradation of BRD4
, ACS Chemical Biology, Vol: 15, Pages: 1306-1312, ISSN: 1554-8929Targeting protein degradation with Proteolysis-Targeting Chimeras (PROTACs) is an area of great current interest in drug discovery. Nevertheless, although the high effectiveness of PROTACs against a wide variety of targets has been established, most degraders reported to date display limited intrinsic tissue selectivity and do not discriminate between cells of different types. Here, we describe a strategy for selective protein degradation in a specific cell type. We report the design and synthesis of a trastuzumab-PROTAC conjugate (Ab-PROTAC 3) in which E3 ligase-directed degrader activity is caged with an antibody linker which can be hydrolyzed following antibody–PROTAC internalization, releasing the active PROTAC and inducing catalytic protein degradation. We show that 3 selectively targets bromodomain-containing protein 4 (BRD4) for degradation only in HER2 positive breast cancer cell lines, while sparing HER2 negative cells. Using live cell confocal microscopy, we show internalization and lysosomal trafficking of the conjugate specifically in HER2 positive cells, leading to the release of active PROTAC in quantities sufficient to induce potent BRD4 degradation. These studies demonstrate proof-of-concept for tissue-specific BRD4 degradation, overcoming limitations of PROTAC selectivity, with significant potential for application to novel targets.
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Journal articleSaunders CN, Cota E, Baum J, et al., 2020,
Peptide probes for Plasmodium falciparum MyoA tail interacting protein (MTIP): exploring the druggability of the malaria parasite motor complex
, ACS Chemical Biology, Vol: 15, Pages: 1313-1320, ISSN: 1554-8929Malaria remains an endemic tropical disease, and the emergence of Plasmodium falciparum parasites resistant to current front-line medicines means that new therapeutic targets are required. The Plasmodium glideosome is a multiprotein complex thought to be essential for efficient host red blood cell invasion. At its core is a myosin motor, Myosin A (MyoA), which provides most of the force required for parasite invasion. Here, we report the design and development of improved peptide-based probes for the anchor point of MyoA, the P. falciparum MyoA tail interacting protein (PfMTIP). These probes combine low nanomolar binding affinity with significantly enhanced cell penetration and demonstrable competitive target engagement with native PfMTIP through a combination of Western blot and chemical proteomics. These results provide new insights into the potential druggability of the MTIP/MyoA interaction and a basis for the future design of inhibitors.
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Journal articleSimoes BM, Santiago-Gomez A, Chiodo C, et al., 2020,
Targeting STAT3 signaling using stabilised sulforaphane (SFX-01) inhibits endocrine resistant stem-like cells in ER-positive breast cancer
, ONCOGENE, Vol: 39, Pages: 4896-4908, ISSN: 0950-9232- Author Web Link
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- Citations: 22
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Journal articleFedoryshchak R, Ocasio C, Strutton B, et al., 2020,
Wheat pathogen Zymoseptoria tritici N-myristoyltransferase inhibitors: on-target antifungal activity and an unusual metabolic defense mechanism
, RSC Chemical Biology, Vol: 1, Pages: 68-78, ISSN: 1747-1613Zymoseptoria tritici is the causative agent of Septoria tritici blotch (STB), which costs billions of dollars annually to major wheat-producing countries in terms of both fungicide use and crop loss. Agricultural pathogenic fungi have acquired resistance to most commercially available fungicide classes, and the rate of discovery and development of new fungicides has stalled, demanding new approaches and insights. Here we investigate a potential mechanism of targeting an important wheat pathogen Z. tritici via inhibition of N-myristoyltransferase (NMT). We characterize Z. tritici NMT biochemically for the first time, profile the in vivo Z. tritici myristoylated proteome and identify and validate the first Z. tritici NMT inhibitors. Proteomic investigation of the downstream effects of NMT inhibition identified an unusual and novel mechanism of defense against chemical toxicity in Z. tritici through the application of comparative bioinformatics to deconvolute function from the previously largely unannotated Z. tritici proteome. Research into novel fungicidal modes-of-action is essential to satisfy an urgent unmet need for novel fungicide targets, and we anticipate that this study will serve as a useful proteomics and bioinformatics resource for researchers studying Z. tritici.
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Journal articleAnderson DP, Benns HJ, Tate EW, et al., 2020,
CRISPR-TAPE: protein-centricCRISPRguide design for targeted proteome engineering
, MOLECULAR SYSTEMS BIOLOGY, Vol: 16, ISSN: 1744-4292
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