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Forrester MT, Egol JR, Tata A, Tata PR, Foster MW. Analysis of Protein Cysteine Acylation Using a Modified Suspension Trap (Acyl-Trap). J Proteome Res 2024; 23:3716-3725. [PMID: 39008777 DOI: 10.1021/acs.jproteome.4c00225] [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: 07/17/2024]
Abstract
Proteins undergo reversible S-acylation via a thioester linkage in vivo. S-palmitoylation, modification by C16:0 fatty acid, is a common S-acylation that mediates critical protein-membrane and protein-protein interactions. The most widely used S-acylation assays, including acyl-biotin exchange and acyl resin-assisted capture, utilize blocking of free Cys thiols, hydroxylamine-dependent cleavage of the thioester and subsequent labeling of nascent thiol. These assays generally require >500 μg of protein input material per sample and numerous reagent removal and washing steps, making them laborious and ill-suited for high throughput and low input applications. To overcome these limitations, we devised "Acyl-Trap", a suspension trap-based assay that utilizes a thiol-reactive quartz to enable buffer exchange and hydroxylamine-mediated S-acyl enrichment. We show that the method is compatible with protein-level detection of S-acylated proteins (e.g., H-Ras) as well as S-acyl site identification and quantification using "on trap" isobaric labeling and LC-MS/MS from as little as 20 μg of protein input. In mouse brain, Acyl-Trap identified 279 reported sites of S-acylation and 1298 previously unreported putative sites. Also described are conditions for long-term hydroxylamine storage, which streamline the assay. More generally, Acyl-Trap serves as a proof-of-concept for PTM-tailored suspension traps suitable for both traditional protein detection and chemoproteomic workflows.
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Affiliation(s)
- Michael T Forrester
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine, Durham, North Carolina 27710, United States
| | - Jacob R Egol
- Department of Cell Biology, Duke University School of Medicine, Durham, North Carolina 27710, United States
| | - Aleksandra Tata
- Department of Cell Biology, Duke University School of Medicine, Durham, North Carolina 27710, United States
| | - Purushothama Rao Tata
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine, Durham, North Carolina 27710, United States
- Department of Cell Biology, Duke University School of Medicine, Durham, North Carolina 27710, United States
- Duke Regeneration Center, Duke University School of Medicine, Durham, North Carolina 27710, United States
| | - Matthew W Foster
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine, Durham, North Carolina 27710, United States
- Proteomics and Metabolomics Core Facility, Duke University School of Medicine, Durham, North Carolina 27710, United States
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Forrester MT, Egol JR, Tata A, Tata PR, Foster MW. Analysis of Protein Cysteine Acylation Using a Modified Suspension Trap (Acyl-Trap). BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.23.586403. [PMID: 38585928 PMCID: PMC10996552 DOI: 10.1101/2024.03.23.586403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Proteins undergo reversible S-acylation via a thioester linkage in vivo. S-palmitoylation, modification by C16:0 fatty acid, is a common S-acylation that mediates critical protein-membrane and protein-protein interactions. The most widely used S-acylation assays, including acyl-biotin exchange and acyl resin-assisted capture, utilize blocking of free Cys thiols, hydroxylamine-dependent cleavage of the thioester and subsequent labeling of nascent thiol. These assays generally require >500 micrograms of protein input material per sample and numerous reagent removal and washing steps, making them laborious and ill-suited for high throughput and low input applications. To overcome these limitations, we devised "Acyl-Trap", a suspension trap-based assay that utilizes a thiol-reactive quartz to enable buffer exchange and hydroxylamine-mediated S-acyl enrichment. We show that the method is compatible with protein-level detection of S-acylated proteins (e.g. H-Ras) as well as S-acyl site identification and quantification using "on trap" isobaric labeling and LC-MS/MS from as little as 20 micrograms of protein input. In mouse brain, Acyl-Trap identified 279 reported sites of S-acylation and 1298 previously unreported putative sites. Also described are conditions for long-term hydroxylamine storage, which streamlines the assay. More generally, Acyl-Trap serves as a proof-of-concept for PTM-tailored suspension traps suitable for both traditional protein detection and chemoproteomic workflows.
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Affiliation(s)
- Michael T. Forrester
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Jacob R. Egol
- Department of Cell Biology, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Aleksandra Tata
- Department of Cell Biology, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Purushothama Rao Tata
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
- Department of Cell Biology, Duke University School of Medicine, Durham, NC, 27710, USA
- Duke Regeneration Center, Duke University School of Medicine, Durham, NC, 27710, USA
| | - Matthew W. Foster
- Division of Pulmonary, Allergy and Critical Care Medicine, Duke University School of Medicine, Durham, NC, 27710, USA
- Proteomics and Metabolomics Core Facility, Duke University School of Medicine, Durham, NC, 27710, USA
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Zhang D, Lu M, Chen C, Xu Y, Peng T. Fatty Acyl Sulfonyl Fluoride as an Activity-Based Probe for Profiling Fatty Acid-Associated Proteins in Living Cells. Chembiochem 2021; 23:e202100628. [PMID: 34918441 DOI: 10.1002/cbic.202100628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 12/16/2021] [Indexed: 11/09/2022]
Abstract
Fatty acids play fundamental structural, metabolic, functional, and signaling roles in all biological systems. Altered fatty acid levels and metabolism have been associated with many pathological conditions. Chemical probes have greatly facilitated biological studies on fatty acids. Herein, we report the development and characterization of an alkynyl-functionalized long-chain fatty acid-based sulfonyl fluoride probe for covalent labelling, enrichment, and identification of fatty acid-associated proteins in living cells. Our quantitative chemical proteomics show that this sulfonyl fluoride probe targets diverse classes of fatty acid-associated proteins including many metabolic serine hydrolases that are known to be involved in fatty acid metabolism and modification. We further validate that the probe covalently modifies the catalytically or functionally essential serine or tyrosine residues of its target proteins and enables evaluation of their inhibitors. The sulfonyl fluoride-based chemical probe thus represents a new tool for profiling the expression and activity of fatty acid-associated proteins in living cells.
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Affiliation(s)
- Dong Zhang
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
| | - Minghao Lu
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
| | - Chengjie Chen
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
| | - Yaxin Xu
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
| | - Tao Peng
- State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055, P. R. China
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