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Yue TC, Ge Y, Aprile FA, Ma MT, Pham TT, Long NJ. Site-Specific 68Ga Radiolabeling of Trastuzumab Fab via Methionine for ImmunoPET Imaging. Bioconjug Chem 2023; 34:1802-1810. [PMID: 37751398 PMCID: PMC10587866 DOI: 10.1021/acs.bioconjchem.3c00344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 09/10/2023] [Indexed: 09/28/2023]
Abstract
Bioconjugates of antibodies and their derivatives radiolabeled with β+-emitting radionuclides can be utilized for diagnostic PET imaging. Site-specific attachment of radioactive cargo to antibody delivery vectors provides homogeneous, well-defined immunoconjugates. Recent studies have demonstrated the utility of oxaziridine chemistry for site-specific labeling of methionine residues. Herein, we applied this approach to site-specifically radiolabel trastuzumab-derived Fab immunoconjugates with 68Ga, which can be used for in vivo PET imaging of HER2-positive breast cancer tumors. Initially, a reactive azide was introduced to a single solvent-accessible methionine residue in both the wild-type Fab and an engineered derivative containing methionine residue M74, utilizing the principles of oxaziridine chemistry. Subsequently, these conjugates were functionalized with a modified DFO chelator incorporating dibenzocyclooctyne. The resulting DFO-WT and DFO-M74 conjugates were radiolabeled with generator-produced [68Ga]Ga3+, to yield the novel PET radiotracers, [68Ga]Ga-DFO-WT and [68Ga]Ga-DFO-M74. In vitro and in vivo studies demonstrated that [68Ga]Ga-DFO-M74 exhibited a higher affinity for HER2 receptors. Biodistribution studies in mice bearing orthotopic HER2-positive breast tumors revealed a higher uptake of [68Ga]Ga-DFO-M74 in the tumor tissue, accompanied by rapid renal clearance, enabling clear delineation of tumors using PET imaging. Conversely, [68Ga]Ga-DFO-WT exhibited lower uptake and inferior image contrast compared to [68Ga]Ga-DFO-M74. Overall, the results demonstrate that the highly facile methionine-oxaziridine modification approach can be simply applied to the synthesis of stable and site-specifically modified radiolabeled antibody-chelator conjugates with favorable pharmacokinetics for PET imaging.
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Affiliation(s)
- Thomas
T. C. Yue
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, Wood Lane, London W120BZ, U.K.
- School
of Biomedical Engineering and Imaging Sciences, King’s College London, Fourth Floor Lambeth Wing, St. Thomas’ Hospital, London SE17EH, U.K.
| | - Ying Ge
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, Wood Lane, London W120BZ, U.K.
| | - Francesco A. Aprile
- Department
of Chemistry and Institute of Chemical Biology, Molecular Sciences
Research Hub, Imperial College London, White City Campus, Wood Lane, London W120BZ, U.K.
| | - Michelle T. Ma
- School
of Biomedical Engineering and Imaging Sciences, King’s College London, Fourth Floor Lambeth Wing, St. Thomas’ Hospital, London SE17EH, U.K.
| | - Truc T. Pham
- School
of Biomedical Engineering and Imaging Sciences, King’s College London, Fourth Floor Lambeth Wing, St. Thomas’ Hospital, London SE17EH, U.K.
| | - Nicholas J. Long
- Department
of Chemistry and Institute of Chemical Biology, Molecular Sciences
Research Hub, Imperial College London, White City Campus, Wood Lane, London W120BZ, U.K.
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Lin B, Xiang L, Yuan Z, Hou Q, Ruan Y, Zhang J. ReACT (redox-activated chemical tagging) chemistry enables direct derivatization and fluorescence detection of S-adenosyl-L-homocysteine (SAH). Org Biomol Chem 2023; 21:7085-7089. [PMID: 37602780 DOI: 10.1039/d3ob01073b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
S-Adenosyl-L-homocysteine (SAH) is a universal byproduct and product inhibitor of the methyltransferase-catalyzed methylation reaction. Here based on ReACT (redox-activated chemical tagging) chemistry, direct derivatization and fluorescence measurement of SAH were achieved with features such as mild reaction conditions and simple operation.
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Affiliation(s)
- Bohong Lin
- Artemisinin Research Center and The First Affiliated Hospital, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou 510405, China.
| | - Lingling Xiang
- Artemisinin Research Center and The First Affiliated Hospital, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou 510405, China.
| | - Zhijun Yuan
- Artemisinin Research Center and The First Affiliated Hospital, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou 510405, China.
| | - Qi Hou
- Artemisinin Research Center and The First Affiliated Hospital, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou 510405, China.
| | - Yaoping Ruan
- Artemisinin Research Center and The First Affiliated Hospital, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou 510405, China.
| | - Jing Zhang
- Artemisinin Research Center and The First Affiliated Hospital, Guangzhou University of Chinese Medicine, 12 Jichang Road, Guangzhou 510405, China.
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3
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Fang Z, Lu Z, Han S, Zhou Y, Yang W, Zhang X, Zhou X. The Transcriptome-Wide Mapping of 2-Methylthio- N6-isopentenyladenosine at Single-Base Resolution. J Am Chem Soc 2023; 145:5467-5473. [PMID: 36820840 DOI: 10.1021/jacs.2c13894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Hundreds of modified bases have been identified and enzymatically modified to transfer RNAs (tRNAs) to regulate RNA function in various organisms. 2-Methylthio-N6-isopentenyladenosine (ms2i6A), a hypermodified base found at tRNA position 37, exists in both prokaryotes and eukaryotes. ms2i6A is traditionally identified by separating and digesting each tRNA from total RNA using RNA mass spectrometry. A transcriptome-wide and single-base resolution method that enables absolute mapping of ms2i6A along with analysis of its distribution in different RNAs is lacking. Here, through chemoselective methylthio group bioconjugation, we introduce a new approach (redox activated chemical tagging sequencing, ReACT-seq) to detect ms2i6A transcriptome-wide at single-base resolution. Using the chemoselectivity between the methylthio group and oxaziridine group, ms2i6A is bio-orthogonally tagged with an azide group without interference of canonical nucleotides, advancing enrichment of methylthio group modified RNAs prior to sequencing. ReACT-seq was demonstrated on nine known tRNAs and proved to be highly accurate, and the reverse transcription stop (RT-stop) character enables ReACT-seq detection at single-base resolution. In addition, ReACT-seq identified that the modification of ms2i6A is conservative and may not exist in other RNAs.
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Affiliation(s)
- Zhentian Fang
- College of Chemistry and Molecular Sciences, Department of Hematology of Zhongnan Hospital, Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Ziang Lu
- College of Chemistry and Molecular Sciences, Department of Hematology of Zhongnan Hospital, Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Shaoqing Han
- College of Chemistry and Molecular Sciences, Department of Hematology of Zhongnan Hospital, Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Yuanyuan Zhou
- State Key Laboratory of Virology and Medical Research Institute, Hubei Province Key Laboratory of Allergy and Immunology and Department of Immunology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China
| | - Wei Yang
- College of Chemistry and Molecular Sciences, Department of Hematology of Zhongnan Hospital, Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
| | - Xiaolian Zhang
- State Key Laboratory of Virology and Medical Research Institute, Hubei Province Key Laboratory of Allergy and Immunology and Department of Immunology, Wuhan University School of Medicine, Wuhan 430071, People's Republic of China
| | - Xiang Zhou
- College of Chemistry and Molecular Sciences, Department of Hematology of Zhongnan Hospital, Taikang Center for Life and Medical Sciences, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
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4
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Gonzalez-Valero A, Reeves AG, Page ACS, Moon PJ, Miller E, Coulonval K, Crossley SWM, Xie X, He D, Musacchio PZ, Christian AH, McKenna JM, Lewis RA, Fang E, Dovala D, Lu Y, McGregor LM, Schirle M, Tallarico JA, Roger PP, Toste FD, Chang CJ. An Activity-Based Oxaziridine Platform for Identifying and Developing Covalent Ligands for Functional Allosteric Methionine Sites: Redox-Dependent Inhibition of Cyclin-Dependent Kinase 4. J Am Chem Soc 2022; 144:22890-22901. [PMID: 36484997 PMCID: PMC10124963 DOI: 10.1021/jacs.2c04039] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Activity-based protein profiling (ABPP) is a versatile strategy for identifying and characterizing functional protein sites and compounds for therapeutic development. However, the vast majority of ABPP methods for covalent drug discovery target highly nucleophilic amino acids such as cysteine or lysine. Here, we report a methionine-directed ABPP platform using Redox-Activated Chemical Tagging (ReACT), which leverages a biomimetic oxidative ligation strategy for selective methionine modification. Application of ReACT to oncoprotein cyclin-dependent kinase 4 (CDK4) as a representative high-value drug target identified three new ligandable methionine sites. We then synthesized a methionine-targeting covalent ligand library bearing a diverse array of heterocyclic, heteroatom, and stereochemically rich substituents. ABPP screening of this focused library identified 1oxF11 as a covalent modifier of CDK4 at an allosteric M169 site. This compound inhibited kinase activity in a dose-dependent manner on purified protein and in breast cancer cells. Further investigation of 1oxF11 found prominent cation-π and H-bonding interactions stabilizing the binding of this fragment at the M169 site. Quantitative mass-spectrometry studies validated 1oxF11 ligation of CDK4 in breast cancer cell lysates. Further biochemical analyses revealed cross-talk between M169 oxidation and T172 phosphorylation, where M169 oxidation prevented phosphorylation of the activating T172 site on CDK4 and blocked cell cycle progression. By identifying a new mechanism for allosteric methionine redox regulation on CDK4 and developing a unique modality for its therapeutic intervention, this work showcases a generalizable platform that provides a starting point for engaging in broader chemoproteomics and protein ligand discovery efforts to find and target previously undruggable methionine sites.
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Affiliation(s)
- Angel Gonzalez-Valero
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Audrey G. Reeves
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Annika C. S. Page
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Patrick J. Moon
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Edward Miller
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Katia Coulonval
- Faculté de Médecine, Institute of Interdisciplinary Research, Université Libre de Bruxelles, Campus Erasme, Brussels 1070, Belgium
| | - Steven W. M. Crossley
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Xiao Xie
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Dan He
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Patricia Z. Musacchio
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Alec H. Christian
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jeffrey M. McKenna
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Richard A. Lewis
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Eric Fang
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Dustin Dovala
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Yipin Lu
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Lynn M. McGregor
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Markus Schirle
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - John A. Tallarico
- Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
| | - Pierre P. Roger
- Faculté de Médecine, Institute of Interdisciplinary Research, Université Libre de Bruxelles, Campus Erasme, Brussels 1070, Belgium
| | - F. Dean Toste
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Christopher J. Chang
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
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