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Miyada MG, Choi Y, Stepanauskas R, Woyke T, La Clair JJ, Burkart MD. Fluorometric Analysis of Carrier-Protein-Dependent Biosynthesis through a Conformationally Sensitive Solvatochromic Pantetheinamide Probe. ACS Chem Biol 2024; 19:1416-1425. [PMID: 38909314 DOI: 10.1021/acschembio.4c00169] [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: 06/24/2024]
Abstract
Carrier proteins (CPs) play a fundamental role in the biosynthesis of fatty acids, polyketides, and non-ribosomal peptides, encompassing many medicinally and pharmacologically relevant compounds. Current approaches to analyze novel carrier-protein-dependent synthetic pathways are hampered by a lack of activity-based assays for natural product biosynthesis. To fill this gap, we turned to 3-methoxychromones, highly solvatochromic fluorescent molecules whose emission intensity and wavelength are heavily dependent on their immediate molecular environment. We have developed a solvatochromic carrier-protein-targeting probe which is able to selectively fluoresce when bound to a target carrier protein. Additionally, the probe displays distinct responses upon CP binding in carrier-protein-dependent synthases. This discerning approach demonstrates the design of solvatochromic fluorophores with the ability to identify biosynthetically active CP-enzyme interactions.
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Affiliation(s)
- Matthew G Miyada
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Yuran Choi
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Ramunas Stepanauskas
- Bigelow Laboratory for Ocean Sciences, East Boothbay, Maine 04544, United States
| | - Tanja Woyke
- DOE Joint Genome Institute, Lawrence Berkeley National Laboratory, Mail Stop: 91R183, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - James J La Clair
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
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2
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Kalaj BN, La Clair JJ, Shen Y, Schwieters CD, Deshmukh L, Burkart MD. Quantitative Characterization of Chain-Flipping of Acyl Carrier Protein of Escherichia coli Using Chemical Exchange NMR. J Am Chem Soc 2024; 146:18650-18660. [PMID: 38875499 DOI: 10.1021/jacs.4c05509] [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: 06/16/2024]
Abstract
The acyl carrier protein of Escherichia coli, termed AcpP, is a prototypical example of type II fatty acid synthase systems found in many bacteria. It serves as a central hub by accepting diverse acyl moieties (4-18 carbons) and shuttling them between its multiple enzymatic partners to generate fatty acids. Prior structures of acyl-AcpPs established that thioester-linked acyl cargos are sequestered within AcpP's hydrophobic lumen. In contrast, structures of enzyme-bound acyl-AcpPs showed translocation of AcpP-tethered acyl chains into the active sites of enzymes. The mechanistic underpinnings of this conformational interplay, termed chain-flipping, are unclear. Here, using heteronuclear NMR spectroscopy, we reveal that AcpP-tethered acyl chains (6-10 carbons) spontaneously adopt lowly populated solvent-exposed conformations. To this end, we devised a new strategy to replace AcpP's thioester linkages with 15N-labeled amide bonds, which facilitated direct "visualization" of these excited states using NMR chemical exchange saturation transfer and relaxation dispersion measurements. Global fitting of the corresponding data yielded kinetic rate constants of the underlying equilibrium and populations and lifetimes of solvent-exposed states. The latter were influenced by acyl chain composition and ranged from milliseconds to submilliseconds for chains containing six, eight, and ten carbons, owing to their variable interactions with AcpP's hydrophobic core. Although transient, the exposure of AcpP-tethered acyl chains to the solvent may allow relevant enzymes to gain access to its active thioester, and the enzyme-induced selection of this conformation will culminate in the production of fatty acids.
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Affiliation(s)
- Brianna N Kalaj
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - James J La Clair
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Yang Shen
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, United States
| | - Charles D Schwieters
- Computational Biomolecular Magnetic Resonance Core, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, United States
| | - Lalit Deshmukh
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
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3
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Minoshima M, Reja SI, Hashimoto R, Iijima K, Kikuchi K. Hybrid Small-Molecule/Protein Fluorescent Probes. Chem Rev 2024; 124:6198-6270. [PMID: 38717865 DOI: 10.1021/acs.chemrev.3c00549] [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: 05/23/2024]
Abstract
Hybrid small-molecule/protein fluorescent probes are powerful tools for visualizing protein localization and function in living cells. These hybrid probes are constructed by diverse site-specific chemical protein labeling approaches through chemical reactions to exogenous peptide/small protein tags, enzymatic post-translational modifications, bioorthogonal reactions for genetically incorporated unnatural amino acids, and ligand-directed chemical reactions. The hybrid small-molecule/protein fluorescent probes are employed for imaging protein trafficking, conformational changes, and bioanalytes surrounding proteins. In addition, fluorescent hybrid probes facilitate visualization of protein dynamics at the single-molecule level and the defined structure with super-resolution imaging. In this review, we discuss development and the bioimaging applications of fluorescent probes based on small-molecule/protein hybrids.
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Affiliation(s)
- Masafumi Minoshima
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 5650871, Japan
| | - Shahi Imam Reja
- Immunology Frontier Research Center, Osaka University, 2-1, Yamadaoka, Suita, Osaka 5650871, Japan
| | - Ryu Hashimoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 5650871, Japan
| | - Kohei Iijima
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 5650871, Japan
| | - Kazuya Kikuchi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka 5650871, Japan
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4
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Rizzo M, Baggs E, Chowdhury AS, Nagarajan R, Warner LR. Backbone 1H, 13C and 15N assignments of the apo-acyl carrier protein (ACP 1) of Pseudomonas aeruginosa. BIOMOLECULAR NMR ASSIGNMENTS 2023; 17:183-188. [PMID: 37421542 PMCID: PMC10772199 DOI: 10.1007/s12104-023-10138-2] [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: 03/14/2023] [Accepted: 06/18/2023] [Indexed: 07/10/2023]
Abstract
The N-acyl-L-homoserine lactone (AHL) quorum sensing regulates virulence in the opportunistic pathogen, Pseudomonas aeruginosa. The LasI and RhlI AHL synthases use acyl carrier protein substrates to synthesize, respectively, the 3-oxododecanoyl-L-homoserine lactone (3-oxoC12-HSL) and butyryl-L-homoserine lactone (C4-HSL) QS signals for this bacterium. Although P. aeruginosa genome contains three open reading frames to encode three acyl carrier proteins, namely the ACP1, ACP2 and ACP3, microarray and gene replacement studies show that only the ACP1 carrier protein is under quorum sensing regulation. In this study, we isotopically enriched one of the acyl carrier proteins, ACP1 from P. aeruginosa and describe the backbone resonance assignments for this protein to delineate the structural and molecular basis of ACP1 recognition in P. aeruginosa AHL quorum sensing signal synthesis.
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Affiliation(s)
| | - Eric Baggs
- Boise State University, Boise, United States
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5
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Mellor DA, Sanlley JO, Burkart M. Using NMR Titration Experiments to Study E. coli FAS-II- and AcpP-Mediated Protein-Protein Interactions. Methods Mol Biol 2023; 2670:49-68. [PMID: 37184699 DOI: 10.1007/978-1-0716-3214-7_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Acyl carrier proteins (ACPs) are central to many primary and secondary metabolic pathways. In E. coli fatty acid biosynthesis (FAB), the central ACP, AcpP, transports intermediates to a suite of partner proteins (PP) for iterative modification and elongation. The regulatory protein-protein interactions that occur between AcpP and the PP in FAB are poorly understood due to the dynamic and transient nature of these interactions. Solution-state NMR spectroscopy can reveal information at the atomic level through experiments such as the 2D heteronuclear single quantum coherence (HSQC). The following protocol describes NMR HSQC titration experiments that can elucidate biomolecular recognition events.
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Affiliation(s)
- Desirae A Mellor
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - Javier O Sanlley
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - Michael Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.
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6
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Geiger F, Wendlandt T, Berking T, Spatz JP, Wege C. Convenient site-selective protein coupling from bacterial raw lysates to coenzyme A-modified tobacco mosaic virus (TMV) by Bacillus subtilis Sfp phosphopantetheinyl transferase. Virology 2023; 578:61-70. [PMID: 36473278 DOI: 10.1016/j.virol.2022.11.013] [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: 08/31/2022] [Revised: 11/22/2022] [Accepted: 11/22/2022] [Indexed: 11/27/2022]
Abstract
A facile enzyme-mediated strategy enables site-specific covalent one-step coupling of genetically tagged luciferase molecules to coenzyme A-modified tobacco mosaic virus (TMV-CoA) both in solution and on solid supports. Bacillus subtilis surfactin phosphopantetheinyl transferase Sfp produced in E. coli mediated the conjugation of firefly luciferase N-terminally extended by eleven amino acids forming a 'ybbR tag' as Sfp-selective substrate, which even worked in bacterial raw lysates. The enzymes displayed on the protein coat of the TMV nanocarriers exhibited high activity. As TMV has proven a beneficial high surface-area adapter template stabilizing enzymes in different biosensing layouts in recent years, the use of TMV-CoA for fishing ybbR-tagged proteins from complex mixtures might become an advantageous concept for the versatile equipment of miniaturized devices with biologically active proteins. It comes along with new opportunities for immobilizing multiple functionalities on TMV adapter coatings, as desired, e.g., in handheld systems for point-of-care detection.
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Affiliation(s)
- Fania Geiger
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, 69120, Heidelberg, Germany; Heidelberg University, Institute for Molecular Systems Engineering and Advanced Materials (IMSEAM), Im Neuenheimer Feld 225, 69120, Heidelberg, Germany
| | - Tim Wendlandt
- University of Stuttgart, Institute of Biomaterials and Biomolecular Systems, Research Unit Molecular and Synthetic Plant Virology, Pfaffenwaldring 57, 70569, Stuttgart, Germany
| | - Tim Berking
- University of Stuttgart, Institute of Organic Chemistry, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Joachim P Spatz
- Max Planck Institute for Medical Research, Department of Cellular Biophysics, Jahnstraße 29, 69120, Heidelberg, Germany; Heidelberg University, Institute for Molecular Systems Engineering and Advanced Materials (IMSEAM), Im Neuenheimer Feld 225, 69120, Heidelberg, Germany; Max Planck School Matter to Life, Jahnstraße 29, 69120, Heidelberg, Germany
| | - Christina Wege
- University of Stuttgart, Institute of Biomaterials and Biomolecular Systems, Research Unit Molecular and Synthetic Plant Virology, Pfaffenwaldring 57, 70569, Stuttgart, Germany.
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7
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Chen A, Mindrebo JT, Davis TD, Kim WE, Katsuyama Y, Jiang Z, Ohnishi Y, Noel JP, Burkart MD. Mechanism-based cross-linking probes capture the Escherichia coli ketosynthase FabB in conformationally distinct catalytic states. Acta Crystallogr D Struct Biol 2022; 78:1171-1179. [PMID: 36048156 PMCID: PMC9435599 DOI: 10.1107/s2059798322007434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 07/20/2022] [Indexed: 11/10/2022] Open
Abstract
Ketosynthases (KSs) catalyse essential carbon-carbon bond-forming reactions in fatty-acid biosynthesis using a two-step, ping-pong reaction mechanism. In Escherichia coli, there are two homodimeric elongating KSs, FabB and FabF, which possess overlapping substrate selectivity. However, FabB is essential for the biosynthesis of the unsaturated fatty acids (UFAs) required for cell survival in the absence of exogenous UFAs. Additionally, FabB has reduced activity towards substrates longer than 12 C atoms, whereas FabF efficiently catalyses the elongation of saturated C14 and unsaturated C16:1 acyl-acyl carrier protein (ACP) complexes. In this study, two cross-linked crystal structures of FabB in complex with ACPs functionalized with long-chain fatty-acid cross-linking probes that approximate catalytic steps were solved. Both homodimeric structures possess asymmetric substrate-binding pockets suggestive of cooperative relationships between the two FabB monomers when engaged with C14 and C16 acyl chains. In addition, these structures capture an unusual rotamer of the active-site gating residue, Phe392, which is potentially representative of the catalytic state prior to substrate release. These structures demonstrate the utility of mechanism-based cross-linking methods to capture and elucidate conformational transitions accompanying KS-mediated catalysis at near-atomic resolution.
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Affiliation(s)
- Aochiu Chen
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Jeffrey T. Mindrebo
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
- Jack H. Skirball Center for Chemical Biology and Proteomics, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Tony D. Davis
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Woojoo E. Kim
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Yohei Katsuyama
- Department of Biotechnology, The Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Ziran Jiang
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Yasuo Ohnishi
- Department of Biotechnology, The Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
- Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Joseph P. Noel
- Jack H. Skirball Center for Chemical Biology and Proteomics, Salk Institute for Biological Studies, La Jolla, CA 92037, USA
| | - Michael D. Burkart
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
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8
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Chen A, Jiang Z, Burkart MD. Enzymology of standalone elongating ketosynthases. Chem Sci 2022; 13:4225-4238. [PMID: 35509474 PMCID: PMC9006962 DOI: 10.1039/d1sc07256k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/09/2022] [Indexed: 12/16/2022] Open
Abstract
The β-ketoacyl-acyl carrier protein synthase, or ketosynthase (KS), catalyses carbon-carbon bond formation in fatty acid and polyketide biosynthesis via a decarboxylative Claisen-like condensation. In prokaryotes, standalone elongating KSs interact with the acyl carrier protein (ACP) which shuttles substrates to each partner enzyme in the elongation cycle for catalysis. Despite ongoing research for more than 50 years since KS was first identified in E. coli, the complex mechanism of KSs continues to be unravelled, including recent understanding of gating motifs, KS-ACP interactions, substrate recognition and delivery, and roles in unsaturated fatty acid biosynthesis. In this review, we summarize the latest studies, primarily conducted through structural biology and molecular probe design, that shed light on the emerging enzymology of standalone elongating KSs.
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Affiliation(s)
- Aochiu Chen
- Department of Chemistry and Biochemistry, University of California, San Diego 9500 Gilman Drive La Jolla CA 92093-0358 USA
| | - Ziran Jiang
- Department of Chemistry and Biochemistry, University of California, San Diego 9500 Gilman Drive La Jolla CA 92093-0358 USA
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego 9500 Gilman Drive La Jolla CA 92093-0358 USA
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9
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Pandey S, Singh A, Yang G, d’Andrea FB, Jiang X, Hartman TE, Mosior JW, Bourland R, Gold B, Roberts J, Geiger A, Tang S, Rhee K, Ouerfelli O, Sacchettini JC, Nathan CF, Burns-Huang K. Characterization of Phosphopantetheinyl Hydrolase from Mycobacterium tuberculosis. Microbiol Spectr 2021; 9:e0092821. [PMID: 34550010 PMCID: PMC8557913 DOI: 10.1128/spectrum.00928-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 08/13/2021] [Indexed: 11/20/2022] Open
Abstract
Phosphopantetheinyl hydrolase, PptH (Rv2795c), is a recently discovered enzyme from Mycobacterium tuberculosis that removes 4'-phosphopantetheine (Ppt) from holo-carrier proteins (CPs) and thereby opposes the action of phosphopantetheinyl transferases (PPTases). PptH is the first structurally characterized enzyme of the phosphopantetheinyl hydrolase family. However, conditions for optimal activity of PptH have not been defined, and only one substrate has been identified. Here, we provide biochemical characterization of PptH and demonstrate that the enzyme hydrolyzes Ppt in vitro from more than one M. tuberculosis holo-CP as well as holo-CPs from other organisms. PptH provided the only detectable activity in mycobacterial lysates that dephosphopantetheinylated acyl carrier protein M (AcpM), suggesting that PptH is the main Ppt hydrolase in M. tuberculosis. We could not detect a role for PptH in coenzyme A (CoA) salvage, and PptH was not required for virulence of M. tuberculosis during infection of mice. It remains to be determined why mycobacteria conserve a broadly acting phosphohydrolase that removes the Ppt prosthetic group from essential CPs. We speculate that the enzyme is critical for aspects of the life cycle of M. tuberculosis that are not routinely modeled. IMPORTANCE Tuberculosis (TB), caused by Mycobacterium tuberculosis, was the leading cause of death from an infectious disease before COVID, yet the in vivo essentiality and function of many of the protein-encoding genes expressed by M. tuberculosis are not known. We biochemically characterize M. tuberculosis's phosphopantetheinyl hydrolase, PptH, a protein unique to mycobacteria that removes an essential posttranslational modification on proteins involved in synthesis of lipids important for the bacterium's cell wall and virulence. We demonstrate that the enzyme has broad substrate specificity, but it does not appear to have a role in coenzyme A (CoA) salvage or virulence in a mouse model of TB.
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Affiliation(s)
- Shilpika Pandey
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Amrita Singh
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Guangli Yang
- Organic Synthesis Core, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Felipe B. d’Andrea
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Xiuju Jiang
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Travis E. Hartman
- Department of Medicine, Weill Cornell Medicine, New York, New York, USA
| | - John W. Mosior
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA
| | - Ronnie Bourland
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA
| | - Ben Gold
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Julia Roberts
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Annie Geiger
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Su Tang
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA
| | - Kyu Rhee
- Department of Medicine, Weill Cornell Medicine, New York, New York, USA
| | - Ouathek Ouerfelli
- Organic Synthesis Core, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - James C. Sacchettini
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, USA
| | - Carl F. Nathan
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
| | - Kristin Burns-Huang
- Department of Microbiology and Immunology, Weill Cornell Medicine, New York, New York, USA
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10
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Jun JV, Raines RT. Two-Step Synthesis of α-Aryl-α-diazoamides as Modular Bioreversible Labels. Org Lett 2021; 23:3110-3114. [PMID: 33818092 DOI: 10.1021/acs.orglett.1c00793] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
α-Aryl-α-diazoamides were synthesized in two steps under mild conditions. This expeditious route employs Pd-catalyzed C-H arylation of N-succinimidyl 2-diazoacetate to obtain N-succinimidyl 2-aryl-2-diazoacetates, followed by aminolysis. The ensuing diazo compounds can esterify carboxyl groups in aqueous solution, and the ester products are substrates for an esterase. The broad scope of the synthetic route enables the continued development of diazo compounds in chemical biology.
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Affiliation(s)
- Joomyung V Jun
- Department of Chemistry and Koch Institute for Integrative Cancer Research at MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Ronald T Raines
- Department of Chemistry and Koch Institute for Integrative Cancer Research at MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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11
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Hsieh YL, Chen CW, Lin WH, Li BR. Construction of the Nickel Oxide Nanocoral Structure on Microscope Slides for Total Self-Assembly-Oriented Probe Immobilization and Signal Enhancement. ACS APPLIED BIO MATERIALS 2020; 3:3304-3312. [PMID: 35025373 DOI: 10.1021/acsabm.0c00249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Proper orientation of probes and the binding capacity of surfaces will determine the performance of bio-applications. It has been reported that immobilizing through bio-/chemical affinity is an efficient but gentle strategy to solve the above-mentioned issue. Herein, we introduce a total self-assembly approach via the strong affinity of nickel oxide (NiO) to the polyhistidine-tag (His-tag). It allows the efficient immobilizing His-tagged proteins with orientation. Furthermore, we find that the nanocoral structure can be formed after applying rapid thermal annealing at 1100 °C, which could increase the His-tagged protein binding capacity efficiently by the enhanced surface-to-volume ratio. Lastly, we demonstrate the NiO thin film with the nanocoral structure, which has great potential for universal biosensing with a wide range of biomolecules, including DNA, protein, and bacteria. Through His-tagged monomer streptavidin (His6-mSA) or His-tagged protein G (His6-protein G), the biotinylated DNA or antibody could be immobilized with proper orientation on the surface consequently to complete a sensitive biomolecule detection. Moreover, the NiO nanocoral structure has the advantages of high hydrophilicity, transmittance, and pH stability that are promising to develop into several kinds of bio-applications in the near future.
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Affiliation(s)
- Yu-Ling Hsieh
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
| | - Chien-Wei Chen
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan.,Department of Electrical and Computer Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
| | - Wan-Hsuan Lin
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
| | - Bor-Ran Li
- Institute of Biomedical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan.,Department of Electrical and Computer Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan.,Center for Emergent Functional Matter Science, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan
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12
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Mindrebo JT, Patel A, Kim WE, Davis TD, Chen A, Bartholow TG, La Clair JJ, McCammon JA, Noel JP, Burkart MD. Gating mechanism of elongating β-ketoacyl-ACP synthases. Nat Commun 2020; 11:1727. [PMID: 32265440 PMCID: PMC7138838 DOI: 10.1038/s41467-020-15455-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 03/06/2020] [Indexed: 12/20/2022] Open
Abstract
Carbon-carbon bond forming reactions are essential transformations in natural product biosynthesis. During de novo fatty acid and polyketide biosynthesis, β-ketoacyl-acyl carrier protein (ACP) synthases (KS), catalyze this process via a decarboxylative Claisen-like condensation reaction. KSs must recognize multiple chemically distinct ACPs and choreograph a ping-pong mechanism, often in an iterative fashion. Here, we report crystal structures of substrate mimetic bearing ACPs in complex with the elongating KSs from Escherichia coli, FabF and FabB, in order to better understand the stereochemical features governing substrate discrimination by KSs. Complemented by molecular dynamics (MD) simulations and mutagenesis studies, these structures reveal conformational states accessed during KS catalysis. These data taken together support a gating mechanism that regulates acyl-ACP binding and substrate delivery to the KS active site. Two active site loops undergo large conformational excursions during this dynamic gating mechanism and are likely evolutionarily conserved features in elongating KSs.
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Affiliation(s)
- Jeffrey T Mindrebo
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA.,Jack H. Skirball Center for Chemical Biology and Proteomics, Salk Institute for Biological Studies, La Jolla, CA, 92037, USA
| | - Ashay Patel
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Woojoo E Kim
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Tony D Davis
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Aochiu Chen
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - Thomas G Bartholow
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA
| | - James J La Clair
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA.,Jack H. Skirball Center for Chemical Biology and Proteomics, Salk Institute for Biological Studies, La Jolla, CA, 92037, USA
| | - J Andrew McCammon
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA.,Department of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
| | - Joseph P Noel
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA. .,Jack H. Skirball Center for Chemical Biology and Proteomics, Salk Institute for Biological Studies, La Jolla, CA, 92037, USA. .,Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, CA, 92037, USA.
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0358, USA.
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13
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Charov K, Burkart MD. A Single Tool to Monitor Multiple Protein-Protein Interactions of the Escherichia coli Acyl Carrier Protein. ACS Infect Dis 2019; 5:1518-1523. [PMID: 31317739 DOI: 10.1021/acsinfecdis.9b00150] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Protein-protein interactions are ubiquitous to all domains of life and have gained recent interest as drug targets. However, many current methods to study protein-protein interactions can be costly and are low-throughput. Here, we demonstrate a solvatochromic tool based on the natural post-translational modification of the Escherichia coli acyl carrier protein (EcACP) used to visualize protein-protein interactions between EcACP and 13 different partner enzymes from several biosynthetic pathways. We use this tool to confirm proposed interactions between EcACP and both catalytic and regulatory proteins. We also show the utility of this method toward detecting allosteric changes to partner enzyme structure and the validation of active site inhibitors. We anticipate the future adaptation of this assay into a high-throughput screen for antibiotic discovery.
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Affiliation(s)
- Katherine Charov
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Michael D. Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
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14
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Sztain T, Bartholow TG, McCammon JA, Burkart MD. Shifting the Hydrolysis Equilibrium of Substrate Loaded Acyl Carrier Proteins. Biochemistry 2019; 58:3557-3560. [PMID: 31397556 DOI: 10.1021/acs.biochem.9b00612] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Acyl carrier proteins (ACP)s transport intermediates through many primary and secondary metabolic pathways. Studying the effect of substrate identity on ACP structure has been hindered by the lability of the thioester bond that attaches acyl substrates to the 4'-phosphopantetheine cofactor of ACP. Here we show that an acyl acyl-carrier protein synthetase (AasS) can be used in real time to shift the hydrolysis equilibrium toward favoring acyl-ACP during solution NMR spectroscopy. Only 0.005 molar equivalents of AasS enables 1 week of stability to palmitoyl-AcpP from Escherichia coli. 2D NMR spectra enabled with this method revealed that the tethered palmitic acid perturbs nearly every secondary structural region of AcpP. This technique will allow previously unachievable structural studies of unstable acyl-ACP species, contributing to the understanding of these complex biosynthetic pathways.
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Affiliation(s)
- Terra Sztain
- Department of Chemistry and Biochemistry , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093-0358 , United States
| | - Thomas G Bartholow
- Department of Chemistry and Biochemistry , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093-0358 , United States
| | - J Andrew McCammon
- Department of Chemistry and Biochemistry , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093-0358 , United States.,Department of Pharmacology , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093-0340 , United States
| | - Michael D Burkart
- Department of Chemistry and Biochemistry , University of California, San Diego , 9500 Gilman Drive , La Jolla , California 92093-0358 , United States
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15
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Milligan JC, Lee DJ, Jackson DR, Schaub AJ, Beld J, Barajas JF, Hale JJ, Luo R, Burkart MD, Tsai SC. Molecular basis for interactions between an acyl carrier protein and a ketosynthase. Nat Chem Biol 2019; 15:669-671. [PMID: 31209348 DOI: 10.1038/s41589-019-0301-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 05/01/2019] [Indexed: 12/30/2022]
Abstract
Fatty acid synthases are dynamic ensembles of enzymes that can biosynthesize long hydrocarbon chains efficiently. Here we visualize the interaction between the Escherichia coli acyl carrier protein (AcpP) and β-ketoacyl-ACP-synthase I (FabB) using X-ray crystallography, NMR, and molecular dynamics simulations. We leveraged this structural information to alter lipid profiles in vivo and provide a molecular basis for how protein-protein interactions can regulate the fatty acid profile in E. coli.
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Affiliation(s)
- Jacob C Milligan
- Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, CA, USA
| | - D John Lee
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - David R Jackson
- Department of Chemistry, University of California, Irvine, Irvine, CA, USA
| | - Andrew J Schaub
- Department of Chemistry, University of California, Irvine, Irvine, CA, USA
| | - Joris Beld
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - Jesus F Barajas
- Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, CA, USA
| | - Joseph J Hale
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA
| | - Ray Luo
- Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, CA, USA
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.
| | - Shiou-Chuan Tsai
- Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, CA, USA. .,Department of Chemistry, University of California, Irvine, Irvine, CA, USA. .,Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, CA, USA.
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16
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Reja SI, Minoshima M, Hori Y, Kikuchi K. Development of an effective protein-labeling system based on smart fluorogenic probes. J Biol Inorg Chem 2019; 24:443-455. [PMID: 31152238 DOI: 10.1007/s00775-019-01669-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 05/15/2019] [Indexed: 12/23/2022]
Abstract
Proteins are an important component of living systems and play a crucial role in various physiological functions. Fluorescence imaging of proteins is a powerful tool for monitoring protein dynamics. Fluorescent protein (FP)-based labeling methods are frequently used to monitor the movement and interaction of cellular proteins. However, alternative methods have also been developed that allow the use of synthetic fluorescent probes to target a protein of interest (POI). Synthetic fluorescent probes have various advantages over FP-based labeling methods. They are smaller in size than the fluorescent proteins, offer a wide variety of colors and have improved photochemical properties. There are various chemical recognition-based labeling techniques that can be used for labeling a POI with a synthetic probe. In this review, we focus on the development of protein-labeling systems, particularly the SNAP-tag, BL-tag, and PYP-tag systems, and understanding the fluorescence behavior of the fluorescently labeled target protein in these systems. We also discuss the smart fluorogenic probes for these protein-labeling systems and their applications. The fluorogenic protein labeling will be a useful tool to investigate complex biological phenomena in future work on cell biology.
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Affiliation(s)
- Shahi Imam Reja
- Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Masafumi Minoshima
- Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Yuichiro Hori
- Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
- Immunology Frontier Research Center (IFReC), Osaka University, Suita, Osaka, 565-0871, Japan
| | - Kazuya Kikuchi
- Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan.
- Immunology Frontier Research Center (IFReC), Osaka University, Suita, Osaka, 565-0871, Japan.
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17
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Zhang Y, Park KY, Suazo KF, Distefano MD. Recent progress in enzymatic protein labelling techniques and their applications. Chem Soc Rev 2018; 47:9106-9136. [PMID: 30259933 PMCID: PMC6289631 DOI: 10.1039/c8cs00537k] [Citation(s) in RCA: 156] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Protein-based conjugates are valuable constructs for a variety of applications. Conjugation of proteins to fluorophores is commonly used to study their cellular localization and the protein-protein interactions. Modification of therapeutic proteins with either polymers or cytotoxic moieties greatly enhances their pharmacokinetics or potency. To label a protein of interest, conventional direct chemical reaction with the side-chains of native amino acids often yields heterogeneously modified products. This renders their characterization complicated, requires difficult separation steps and may impact protein function. Although modification can also be achieved via the insertion of unnatural amino acids bearing bioorthogonal functional groups, these methods can have lower protein expression yields, limiting large scale production. As a site-specific modification method, enzymatic protein labelling is highly efficient and robust under mild reaction conditions. Significant progress has been made over the last five years in modifying proteins using enzymatic methods for numerous applications, including the creation of clinically relevant conjugates with polymers, cytotoxins or imaging agents, fluorescent or affinity probes to study complex protein interaction networks, and protein-linked materials for biosensing. This review summarizes developments in enzymatic protein labelling over the last five years for a panel of ten enzymes, including sortase A, subtiligase, microbial transglutaminase, farnesyltransferase, N-myristoyltransferase, phosphopantetheinyl transferases, tubulin tyrosin ligase, lipoic acid ligase, biotin ligase and formylglycine generating enzyme.
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Affiliation(s)
- Yi Zhang
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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18
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Chen A, Re RN, Burkart MD. Type II fatty acid and polyketide synthases: deciphering protein-protein and protein-substrate interactions. Nat Prod Rep 2018; 35:1029-1045. [PMID: 30046786 PMCID: PMC6233901 DOI: 10.1039/c8np00040a] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Covering: up to April 5, 2018 Metabolites from type II fatty acid synthase (FAS) and polyketide synthase (PKS) pathways differ broadly in their identities and functional roles. The former are considered primary metabolites that are linear hydrocarbon acids, while the latter are complex aromatic or polyunsaturated secondary metabolites. Though the study of bacterial FAS has benefitted from decades of biochemical and structural investigations, type II PKSs have remained less understood. Here we review the recent approaches to understanding the protein-protein and protein-substrate interactions in these pathways, with an emphasis on recent chemical biology and structural applications. New approaches to the study of FAS have highlighted the critical role of the acyl carrier protein (ACP) with regard to how it stabilizes intermediates through sequestration and selectively delivers cargo to successive enzymes within these iterative pathways, utilizing protein-protein interactions to guide and organize enzymatic timing and specificity. Recent tools that have shown promise in FAS elucidation should find new approaches to studying type II PKS systems in the coming years.
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Affiliation(s)
- Aochiu Chen
- Department of Chemistry and Biochemistry, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA.
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19
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Sarria S, Bartholow TG, Verga A, Burkart MD, Peralta-Yahya P. Matching Protein Interfaces for Improved Medium-Chain Fatty Acid Production. ACS Synth Biol 2018; 7:1179-1187. [PMID: 29722970 DOI: 10.1021/acssynbio.7b00334] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Medium-chain fatty acids (MCFAs) are key intermediates in the synthesis of medium-chain chemicals including α-olefins and dicarboxylic acids. In bacteria, microbial production of MCFAs is limited by the activity and product profile of fatty acyl-ACP thioesterases. Here, we engineer a heterologous bacterial medium-chain fatty acyl-ACP thioesterase for improved MCFA production in Escherichia coli. Electrostatically matching the interface between the heterologous medium-chain Acinetobacter baylyi fatty acyl-ACP thioesterase (AbTE) and the endogenous E. coli fatty acid ACP ( E. coli AcpP) by replacing small nonpolar amino acids on the AbTE surface for positively charged ones increased secreted MCFA titers more than 3-fold. Nuclear magnetic resonance titration of E. coli 15N-octanoyl-AcpP with a single AbTE point mutant and the best double mutant showed a progressive and significant increase in the number of interactions when compared to AbTE wildtype. The best AbTE mutant produced 131 mg/L of MCFAs, with MCFAs being 80% of all secreted fatty acid chain lengths after 72 h. To enable the future screening of larger numbers of AbTE variants to further improve MCFA titers, we show that a previously developed G-protein coupled receptor (GPCR)-based MCFA sensor differentially detects MCFAs secreted by E. coli expressing different AbTE variants. This work demonstrates that engineering the interface of heterologous enzymes to better couple with endogenous host proteins is a useful strategy to increase the titers of microbially produced chemicals. Further, this work shows that GPCR-based sensors are producer microbe agnostic and can detect chemicals directly in the producer microbe supernatant, setting the stage for the sensor-guided engineering of MCFA producing microbes.
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Affiliation(s)
- Stephen Sarria
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Thomas G. Bartholow
- Department of Chemistry and Biochemistry, University of California, San Diego, California 92093, United States
| | - Adam Verga
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Michael D. Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, California 92093, United States
| | - Pamela Peralta-Yahya
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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20
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Skiba MA, Maloney FP, Dan Q, Fraley AE, Aldrich CC, Smith JL, Brown WC. PKS-NRPS Enzymology and Structural Biology: Considerations in Protein Production. Methods Enzymol 2018; 604:45-88. [PMID: 29779664 PMCID: PMC5992914 DOI: 10.1016/bs.mie.2018.01.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The structural diversity and complexity of marine natural products have made them a rich and productive source of new bioactive molecules for drug development. The identification of these new compounds has led to extensive study of the protein constituents of the biosynthetic pathways from the producing microbes. Essential processes in the dissection of biosynthesis have been the elucidation of catalytic functions and the determination of 3D structures for enzymes of the polyketide synthases and nonribosomal peptide synthetases that carry out individual reactions. The size and complexity of these proteins present numerous difficulties in the process of going from gene to structure. Here, we review the problems that may be encountered at the various steps of this process and discuss some of the solutions devised in our and other labs for the cloning, production, purification, and structure solution of complex proteins using Escherichia coli as a heterologous host.
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Affiliation(s)
| | | | - Qingyun Dan
- University of Michigan, Ann Arbor, MI, United States
| | - Amy E Fraley
- University of Michigan, Ann Arbor, MI, United States
| | | | - Janet L Smith
- University of Michigan, Ann Arbor, MI, United States.
| | - W Clay Brown
- University of Michigan, Ann Arbor, MI, United States.
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21
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In situ regeneration of bioactive coatings enabled by an evolved Staphylococcus aureus sortase A. Nat Commun 2016; 7:11140. [PMID: 27073027 PMCID: PMC4833859 DOI: 10.1038/ncomms11140] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Accepted: 02/24/2016] [Indexed: 11/08/2022] Open
Abstract
Surface immobilization of bioactive molecules is a central paradigm in the design of implantable devices and biosensors with improved clinical performance capabilities. However, in vivo degradation or denaturation of surface constituents often limits the long-term performance of bioactive films. Here we demonstrate the capacity to repeatedly regenerate a covalently immobilized monomolecular thin film of bioactive molecules through a two-step stripping and recharging cycle. Reversible transpeptidation by a laboratory evolved Staphylococcus aureus sortase A (eSrtA) enabled the rapid immobilization of an anti-thrombogenic film in the presence of whole blood and permitted multiple cycles of film regeneration in vitro that preserved its biological activity. Moreover, eSrtA transpeptidation facilitated surface re-engineering of medical devices in situ after in vivo implantation through removal and restoration film constituents. These studies establish a rapid, orthogonal and reversible biochemical scheme to regenerate selective molecular constituents with the potential to extend the lifetime of bioactive films. Bioactive coatings offer a strategy to modulate host response to implants, but their translation to the clinic is hampered by their fast in vivo degradation. Here, the authors use an engineered bacterial protein to regenerate an anti-thrombogenic film in vitro and in situ after device implantation.
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22
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Grünewald J, Klock HE, Cellitti SE, Bursulaya B, McMullan D, Jones DH, Chiu HP, Wang X, Patterson P, Zhou H, Vance J, Nigoghossian E, Tong H, Daniel D, Mallet W, Ou W, Uno T, Brock A, Lesley SA, Geierstanger BH. Efficient Preparation of Site-Specific Antibody-Drug Conjugates Using Phosphopantetheinyl Transferases. Bioconjug Chem 2015; 26:2554-62. [PMID: 26588668 DOI: 10.1021/acs.bioconjchem.5b00558] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Post-translational modification catalyzed by phosphopantetheinyl transferases (PPTases) has previously been used to site-specifically label proteins with structurally diverse molecules. PPTase catalysis results in covalent modification of a serine residue in acyl/peptidyl carrier proteins and their surrogate substrates which are typically fused to the N- or C-terminus. To test the utility of PPTases for preparing antibody-drug conjugates (ADCs), we inserted 11 and 12-mer PPTase substrate sequences at 110 constant region loop positions of trastuzumab. Using Sfp-PPTase, 63 sites could be efficiently labeled with an auristatin toxin, resulting in 95 homogeneous ADCs. ADCs labeled in the CH1 domain displayed in general excellent pharmacokinetic profiles and negligible drug loss. A subset of CH2 domain conjugates underwent rapid clearance in mouse pharmacokinetic studies. Rapid clearance correlated with lower thermal stability of the particular antibodies. Independent of conjugation site, almost all ADCs exhibited subnanomolar in vitro cytotoxicity against HER2-positive cell lines. One selected ADC was shown to induce tumor regression in a xenograft model at a single dose of 3 mg/kg, demonstrating that PPTase-mediated conjugation is suitable for the production of highly efficacious and homogeneous ADCs.
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Affiliation(s)
- Jan Grünewald
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Heath E Klock
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Susan E Cellitti
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Badry Bursulaya
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Daniel McMullan
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - David H Jones
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Hsien-Po Chiu
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Xing Wang
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Paula Patterson
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Huanfang Zhou
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Julie Vance
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Edward Nigoghossian
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Hung Tong
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Dylan Daniel
- Novartis Institutes for BioMedical Research , 4560 Horton Street, Emeryville, California 94608-2916, United States
| | - William Mallet
- Novartis Institutes for BioMedical Research , 4560 Horton Street, Emeryville, California 94608-2916, United States
| | - Weijia Ou
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Tetsuo Uno
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Ansgar Brock
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Scott A Lesley
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
| | - Bernhard H Geierstanger
- Genomics Institute of the Novartis Research Foundation , 10675 John-Jay-Hopkins Drive, San Diego, California 92121-1125, United States
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23
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Finzel K, Nguyen C, Jackson DR, Gupta A, Tsai SC, Burkart MD. Probing the Substrate Specificity and Protein-Protein Interactions of the E. coli Fatty Acid Dehydratase, FabA. ACTA ACUST UNITED AC 2015; 22:1453-1460. [PMID: 26526101 DOI: 10.1016/j.chembiol.2015.09.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 08/24/2015] [Accepted: 09/07/2015] [Indexed: 01/01/2023]
Abstract
Microbial fatty acid biosynthetic enzymes are important targets for areas as diverse as antibiotic development to biofuel production. Elucidating the molecular basis of chain length control during fatty acid biosynthesis is crucial for the understanding of regulatory processes of this fundamental metabolic pathway. In Escherichia coli, the acyl carrier protein (AcpP) plays a central role by sequestering and shuttling the growing acyl chain between fatty acid biosynthetic enzymes. FabA, a β-hydroxyacyl-AcpP dehydratase, is an important enzyme in controlling fatty acid chain length and saturation levels. FabA-AcpP interactions are transient in nature and thus difficult to visualize. In this study, four mechanistic crosslinking probes mimicking varying acyl chain lengths were synthesized to systematically probe for modified chain length specificity of 14 FabA mutants. These studies provide evidence for the AcpP-interacting "positive patch," FabA mutations that alter substrate specificity, and the roles that the FabA "gating residues" play in chain length control.
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Affiliation(s)
- Kara Finzel
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA
| | - Chi Nguyen
- Departments of Molecular Biology and Biochemistry, Chemistry and Pharmaceutical Sciences, University of California, Irvine, Irvine, CA 92697-1450, USA
| | - David R Jackson
- Departments of Molecular Biology and Biochemistry, Chemistry and Pharmaceutical Sciences, University of California, Irvine, Irvine, CA 92697-1450, USA
| | - Aarushi Gupta
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA
| | - Shiou-Chuan Tsai
- Departments of Molecular Biology and Biochemistry, Chemistry and Pharmaceutical Sciences, University of California, Irvine, Irvine, CA 92697-1450, USA.
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA.
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24
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Jaremko MJ, Lee DJ, Opella SJ, Burkart MD. Structure and Substrate Sequestration in the Pyoluteorin Type II Peptidyl Carrier Protein PltL. J Am Chem Soc 2015; 137:11546-9. [PMID: 26340431 DOI: 10.1021/jacs.5b04525] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Type II nonribosomal peptide synthetases (NRPS) generate exotic amino acid derivatives that, combined with additional pathways, form many bioactive natural products. One family of type II NRPSs produce pyrrole moieties, which commonly arise from proline oxidation while tethered to a conserved, type II peptidyl carrier protein (PCP), as exemplified by PltL in the biosynthesis of pyoluteorin. We sought to understand the structural role of pyrrole PCPs in substrate and protein interactions through the study of pyrrole analogs tethered to PltL. Solution-phase NMR structural analysis revealed key interactions in residues of helix II and III with a bound pyrrole moiety. Conservation of these residues among PCPs in other pyrrole containing pathways suggests a conserved mechanism for formation, modification, and incorporation of pyrrole moieties. Further NOE analysis provided a unique pyrrole binding motif, offering accurate substrate positioning within the cleft between helices II and III. The overall structure resembles other PCPs but contains a unique conformation for helix III. This provides evidence of sequestration by the PCP of aromatic pyrrole substrates, illustrating the importance of substrate protection and regulation in type II NRPS systems.
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Affiliation(s)
- Matt J Jaremko
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - D John Lee
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Stanley J Opella
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093-0358, United States
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25
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Heller K, Ochtrop P, Albers MF, Zauner FB, Itzen A, Hedberg C. Kovalente Proteinmarkierung durch enzymatische Phosphocholinierung. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502618] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Heller K, Ochtrop P, Albers MF, Zauner FB, Itzen A, Hedberg C. Covalent Protein Labeling by Enzymatic Phosphocholination. Angew Chem Int Ed Engl 2015; 54:10327-30. [PMID: 26147231 DOI: 10.1002/anie.201502618] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Indexed: 11/07/2022]
Abstract
We present a new protein labeling method based on the covalent enzymatic phosphocholination of a specific octapeptide amino acid sequence in intact proteins. The bacterial enzyme AnkX from Legionella pneumophila has been established to transfer functional phosphocholine moieties from synthetically produced CDP-choline derivatives to N-termini, C-termini, and internal loop regions in proteins of interest. Furthermore, the covalent modification can be hydrolytically removed by the action of the Legionella enzyme Lem3. Only a short peptide sequence (eight amino acids) is required for efficient protein labeling and a small linker group (PEG-phosphocholine) is introduced to attach the conjugated cargo.
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Affiliation(s)
- Katharina Heller
- Center for Integrated Protein Science Munich, Technische Universität München, Department Chemistry, Lichtenbergstrasse 4, 85748 Garching (Germany)
| | - Philipp Ochtrop
- Chemical Biology Center (KBC), Institute of Chemistry, Umeå University, 90187 Umeå (Sweden)
| | - Michael F Albers
- Chemical Biology Center (KBC), Institute of Chemistry, Umeå University, 90187 Umeå (Sweden)
| | - Florian B Zauner
- Center for Integrated Protein Science Munich, Technische Universität München, Department Chemistry, Lichtenbergstrasse 4, 85748 Garching (Germany)
| | - Aymelt Itzen
- Center for Integrated Protein Science Munich, Technische Universität München, Department Chemistry, Lichtenbergstrasse 4, 85748 Garching (Germany).
| | - Christian Hedberg
- Chemical Biology Center (KBC), Institute of Chemistry, Umeå University, 90187 Umeå (Sweden). .,Max Planck Institute of Molecular Physiology, Department of Chemical Biology, Otto-Hahn-Strasse 11, 44227 Dortmund (Germany).
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27
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Finzel K, Lee DJ, Burkart MD. Using modern tools to probe the structure-function relationship of fatty acid synthases. Chembiochem 2015; 16:528-547. [PMID: 25676190 PMCID: PMC4545599 DOI: 10.1002/cbic.201402578] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Indexed: 12/25/2022]
Abstract
Fatty acid biosynthesis is essential to life and represents one of the most conserved pathways in nature, preserving the same handful of chemical reactions across all species. Recent interest in the molecular details of the de novo fatty acid synthase (FAS) has been heightened by demand for renewable fuels and the emergence of multidrug-resistant bacterial strains. Central to FAS is the acyl carrier protein (ACP), a protein chaperone that shuttles the growing acyl chain between catalytic enzymes within the FAS. Human efforts to alter fatty acid biosynthesis for oil production, chemical feedstock, or antimicrobial purposes has been met with limited success, due in part to a lack of detailed molecular information behind the ACP-partner protein interactions inherent to the pathway. This review will focus on recently developed tools for the modification of ACP and analysis of protein-protein interactions, such as mechanism-based crosslinking, and the studies exploiting them. Discussion specific to each enzymatic domain will focus first on mechanism and known inhibitors, followed by available structures and known interactions with ACP. Although significant unknowns remain, new understandings of the intricacies of FAS point to future advances in manipulating this complex molecular factory.
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Affiliation(s)
- Kara Finzel
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358 (USA)
| | - D. John Lee
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358 (USA)
| | - Michael D. Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358 (USA)
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28
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Beld J, Lee DJ, Burkart MD. Fatty acid biosynthesis revisited: structure elucidation and metabolic engineering. MOLECULAR BIOSYSTEMS 2015; 11:38-59. [PMID: 25360565 PMCID: PMC4276719 DOI: 10.1039/c4mb00443d] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Fatty acids are primary metabolites synthesized by complex, elegant, and essential biosynthetic machinery. Fatty acid synthases resemble an iterative assembly line, with an acyl carrier protein conveying the growing fatty acid to necessary enzymatic domains for modification. Each catalytic domain is a unique enzyme spanning a wide range of folds and structures. Although they harbor the same enzymatic activities, two different types of fatty acid synthase architectures are observed in nature. During recent years, strained petroleum supplies have driven interest in engineering organisms to either produce more fatty acids or specific high value products. Such efforts require a fundamental understanding of the enzymatic activities and regulation of fatty acid synthases. Despite more than one hundred years of research, we continue to learn new lessons about fatty acid synthases' many intricate structural and regulatory elements. In this review, we summarize each enzymatic domain and discuss efforts to engineer fatty acid synthases, providing some clues to important challenges and opportunities in the field.
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Affiliation(s)
- Joris Beld
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA.
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29
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Rashidian M, Dozier JK, Distefano MD. Enzymatic labeling of proteins: techniques and approaches. Bioconjug Chem 2014; 24:1277-94. [PMID: 23837885 DOI: 10.1021/bc400102w] [Citation(s) in RCA: 194] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Site-specific modification of proteins is a major challenge in modern chemical biology due to the large number of reactive functional groups typically present in polypeptides. Because of its importance in biology and medicine, the development of methods for site-specific modification of proteins is an area of intense research. Selective protein modification procedures have been useful for oriented protein immobilization, for studies of naturally occurring post-translational modifications, for creating antibody–drug conjugates, for the introduction of fluorophores and other small molecules on to proteins, for examining protein structure, folding, dynamics, and protein–protein interactions, and for the preparation of protein–polymer conjugates. One of the most important approaches for protein labeling is to incorporate bioorthogonal functionalities into proteins at specific sites via enzymatic reactions. The incorporated tags then enable reactions that are chemoselective, whose functional groups not only are inert in biological media, but also do not occur natively in proteins or other macromolecules. This review article summarizes the enzymatic strategies, which enable site-specific functionalization of proteins with a variety of different functional groups. The enzymes covered in this review include formylglycine generating enzyme, sialyltransferases, phosphopantetheinyltransferases, O-GlcNAc post-translational modification, sortagging, transglutaminase, farnesyltransferase, biotin ligase, lipoic acid ligase, and N-myristoyltransferase.
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30
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Shakya G, Rivera H, Lee DJ, Jaremko MJ, La Clair JJ, Fox DT, Haushalter RW, Schaub AJ, Bruegger J, Barajas JF, White AR, Kaur P, Gwozdziowski ER, Wong F, Tsai SC, Burkart MD. Modeling linear and cyclic PKS intermediates through atom replacement. J Am Chem Soc 2014; 136:16792-9. [PMID: 25406716 PMCID: PMC4277753 DOI: 10.1021/ja5064857] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Indexed: 11/30/2022]
Abstract
The mechanistic details of many polyketide synthases (PKSs) remain elusive due to the instability of transient intermediates that are not accessible via conventional methods. Here we report an atom replacement strategy that enables the rapid preparation of polyketone surrogates by selective atom replacement, thereby providing key substrate mimetics for detailed mechanistic evaluations. Polyketone mimetics are positioned on the actinorhodin acyl carrier protein (actACP) to probe the underpinnings of substrate association upon nascent chain elongation and processivity. Protein NMR is used to visualize substrate interaction with the actACP, where a tetraketide substrate is shown not to bind within the protein, while heptaketide and octaketide substrates show strong association between helix II and IV. To examine the later cyclization stages, we extended this strategy to prepare stabilized cyclic intermediates and evaluate their binding by the actACP. Elongated monocyclic mimics show much longer residence time within actACP than shortened analogs. Taken together, these observations suggest ACP-substrate association occurs both before and after ketoreductase action upon the fully elongated polyketone, indicating a key role played by the ACP within PKS timing and processivity. These atom replacement mimetics offer new tools to study protein and substrate interactions and are applicable to a wide variety of PKSs.
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Affiliation(s)
- Gaurav Shakya
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Heriberto Rivera
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - D. John Lee
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Matt J. Jaremko
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - James J. La Clair
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Daniel T. Fox
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Robert W. Haushalter
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Andrew J. Schaub
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Joel Bruegger
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Jesus F. Barajas
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Alexander R. White
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Parminder Kaur
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Emily R. Gwozdziowski
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Fiona Wong
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Shiou-Chuan Tsai
- Departments
of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical
Sciences, University of California, Irvine, California 92697, United States
| | - Michael D. Burkart
- Department
of Chemistry and Biochemistry, University
of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
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31
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Ku TH, Sahu S, Kosa NM, Pham KM, Burkart MD, Gianneschi NC. Tapping a bacterial enzymatic pathway for the preparation and manipulation of synthetic nanomaterials. J Am Chem Soc 2014; 136:17378-81. [PMID: 25468257 DOI: 10.1021/ja509827s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We present a spherical micelle generated in a three-step sequence in which a farnesyl-pantetheine conjugate is phosphorylated, adenylated, and phosphorylated once more to generate a farnesyl-CoA amphiphile that self-assembles into spherical micelles. A sphere-to-fibril morphological switch is achieved by enzymatically transferring the farnesyl group of the farnesyl-CoA micelle onto a peptide via phosphopantetheinyl transferase to generate a peptide amphiphile. Each step in the sequence is followed with characterization by HPLC, MS, TEM, and DLS. This system offers an entry into cofactor-mediated peptide decoration by extending the principles of bioresponsive polymeric materials to sequential enzyme cascades.
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Affiliation(s)
- Ti-Hsuan Ku
- Department of Chemistry and Biochemistry, University of California, San Diego , 9500 Gilman Drive, La Jolla, California 92093, United States
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32
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Beld J, Finzel K, Burkart MD. Versatility of acyl-acyl carrier protein synthetases. ACTA ACUST UNITED AC 2014; 21:1293-1299. [PMID: 25308274 DOI: 10.1016/j.chembiol.2014.08.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 08/08/2014] [Accepted: 08/14/2014] [Indexed: 01/21/2023]
Abstract
The acyl carrier protein (ACP) requires posttranslational modification with a 4'-phosphopantetheine arm for activity, and this thiol-terminated modification carries cargo between enzymes in ACP-dependent metabolic pathways. We show that acyl-ACP synthetases (AasSs) from different organisms are able to load even, odd, and unnatural fatty acids onto E. coli ACP in vitro. Vibrio harveyi AasS not only shows promiscuity for the acid substrate, but also is active upon various alternate carrier proteins. AasS activity also extends to functional activation in living organisms. We show that exogenously supplied carboxylic acids are loaded onto ACP and extended by the E. coli fatty acid synthase, including unnatural fatty acid analogs. These analogs are further integrated into cellular lipids. In vitro characterization of four different adenylate-forming enzymes allowed us to disambiguate CoA-ligases and AasSs, and further in vivo studies show the potential for functional application in other organisms.
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Affiliation(s)
- Joris Beld
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Kara Finzel
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA
| | - Michael D Burkart
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA.
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33
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Beld J, Blatti JL, Behnke C, Mendez M, Burkart MD. Evolution of acyl-ACP-thioesterases and β-ketoacyl-ACP-synthases revealed by protein-protein interactions. JOURNAL OF APPLIED PHYCOLOGY 2014; 26:1619-1629. [PMID: 25110394 PMCID: PMC4125210 DOI: 10.1007/s10811-013-0203-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The fatty acid synthase (FAS) is a conserved primary metabolic enzyme complex capable of tolerating cross-species engineering of domains for the development of modified and overproduced fatty acids. In eukaryotes, acyl-acyl carrier protein thioesterases (TEs) off-load mature cargo from the acyl carrier protein (ACP), and plants have developed TEs for short/medium-chain fatty acids. We showed that engineering plant TEs into the green microalga Chlamydomonas reinhardtii does not result in the predicted shift in fatty acid profile. Since fatty acid biosynthesis relies on substrate recognition and protein-protein interactions between the ACP and its partner enzymes, we hypothesized that plant TEs and algal ACP do not functionally interact. Phylogenetic analysis revealed major evolutionary differences between FAS enzymes, including TEs and ketoacyl synthases (KSs), in which the former is present only in some species, whereas the latter is present in all, and has a common ancestor. In line with these results, TEs appeared to be selective towards their ACP partners whereas KSs showed promiscuous behavior across bacterial, plant and algal species. Based on phylogenetic analyses, in silico docking, in vitro mechanistic crosslinking and in vivo algal engineering, we propose that phylogeny can predict effective interactions between ACPs and partner enzymes.
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34
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The chain-flipping mechanism of ACP (acyl carrier protein)-dependent enzymes appears universal. Biochem J 2014; 460:157-63. [PMID: 24825445 DOI: 10.1042/bj20140239] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
ACPs (acyl carrier proteins) play essential roles in the synthesis of fatty acids, polyketides and non-ribosomal polypeptides. ACP function requires the modification of the protein by attachment of 4'-phosphopantetheine to a conserved serine residue. The phosphopantetheine thiol acts to tether the starting materials and intermediates as their thioesters. ACPs are small highly soluble proteins composed of four α-helices. The helices form a bundle that acts as a hydrophobic sleeve that sequesters the acyl chains and activated thioesters from solvent. However, in the synthesis of fatty acids and complex lipids the enzymes of the pathway must access the thioester and the proximal carbon atoms in order to perform the needed chemistry. How such access is provided without exposure of the acyl chains to solvent has been a longstanding question due to the lack of acyl-ACP-enzyme complexes, a situation generally attributed to the brevity of the interactions of acyl-ACPs with their cognate enzymes. As discussed in the present review the access question has now been answered by four recent crystal structures, each of which shows that the entire acyl chain plus the 4'-phosphopantetheine prosthetic group partitions from the ACP hydrophobic sleeve into a hydrophobic pocket or groove of the enzyme protein, a process termed chain flipping.
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35
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Tufar P, Rahighi S, Kraas F, Kirchner D, Löhr F, Henrich E, Köpke J, Dikic I, Güntert P, Marahiel M, Dötsch V. Crystal Structure of a PCP/Sfp Complex Reveals the Structural Basis for Carrier Protein Posttranslational Modification. ACTA ACUST UNITED AC 2014; 21:552-562. [DOI: 10.1016/j.chembiol.2014.02.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 02/02/2014] [Accepted: 02/06/2014] [Indexed: 11/17/2022]
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36
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Kosa NM, Pham KM, Burkart MD. Chemoenzymatic exchange of phosphopantetheine on protein and peptide. Chem Sci 2014; 5:1179-1186. [PMID: 26998215 PMCID: PMC4795179 DOI: 10.1039/c3sc53154f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Evaluation of new acyl carrier protein hydrolase (AcpH, EC 3.1.4.14) homologs from proteobacteria and cyanobacteria reveals significant variation in substrate selectivity and kinetic parameters for phosphopantetheine hydrolysis from carrier proteins. Evaluation with carrier proteins from both primary and secondary metabolic pathways reveals an overall preference for acyl carrier protein (ACP) substrates from type II fatty acid synthases, as well as variable activity for polyketide synthase ACPs and peptidyl carrier proteins (PCP) from non-ribosomal peptide synthases. We also demonstrate the kinetic parameters of these homologs for AcpP and the 11-mer peptide substrate YbbR. These findings enable the fully reversible labeling of all three classes of natural product synthase carrier proteins as well as full and minimal fusion protein constructs.
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Affiliation(s)
- Nicolas M. Kosa
- Department of Chemistry and Biochemistry, University of California, San Diego (UCSD), La Jolla, California, USA
| | - Kevin M. Pham
- Department of Chemistry and Biochemistry, University of California, San Diego (UCSD), La Jolla, California, USA
| | - Michael D. Burkart
- Department of Chemistry and Biochemistry, University of California, San Diego (UCSD), La Jolla, California, USA
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37
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Rothmann M, Kosa NM, Burkart MD. Resin supported acyl carrier protein labeling strategies. RSC Adv 2014; 4:9092-9097. [PMID: 24818001 DOI: 10.1039/c3ra47847e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The post-translational modifying enzymes phophopantetheinyl transferase and acyl carrier protein hydrolase have shown utility in the functional modification of acyl carrier proteins. Here we develop these tools as immobilized biocatalysts on agarose supports. New utility is imparted through these methods, enabling rapid and label-independent protein purification. Immobilization of acyl carrier protein is also demonstrated for rapid activity assays of these 4'-phosophopantetheine modifying enzymes, displaying a particular advantage in the case of phosphopantetheine removal, where few orthogonal techniques have been demonstrated. These tools further enrich the suite of functional utility of 4'-phosophopantetheine chemistry, with applications to protein functionalization, materials, and natural product biosynthetic studies.
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Affiliation(s)
- Michael Rothmann
- University of California, San Diego, Department of Chemistry and Biochemistry, 9500 Gilman Drive, San Diego, USA
| | - Nicolas M Kosa
- University of California, San Diego, Department of Chemistry and Biochemistry, 9500 Gilman Drive, San Diego, USA
| | - Michael D Burkart
- University of California, San Diego, Department of Chemistry and Biochemistry, 9500 Gilman Drive, San Diego, USA
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38
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Beld J, Sonnenschein EC, Vickery CR, Noel JP, Burkart MD. The phosphopantetheinyl transferases: catalysis of a post-translational modification crucial for life. Nat Prod Rep 2014; 31:61-108. [PMID: 24292120 PMCID: PMC3918677 DOI: 10.1039/c3np70054b] [Citation(s) in RCA: 240] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Covering: up to 2013. Although holo-acyl carrier protein synthase, AcpS, a phosphopantetheinyl transferase (PPTase), was characterized in the 1960s, it was not until the publication of the landmark paper by Lambalot et al. in 1996 that PPTases garnered wide-spread attention being classified as a distinct enzyme superfamily. In the past two decades an increasing number of papers have been published on PPTases ranging from identification, characterization, structure determination, mutagenesis, inhibition, and engineering in synthetic biology. In this review, we comprehensively discuss all current knowledge on this class of enzymes that post-translationally install a 4'-phosphopantetheine arm on various carrier proteins.
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Affiliation(s)
- Joris Beld
- Department of Chemistry and Biochemistry, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA.
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39
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Ishikawa F, Haushalter RW, Lee DJ, Finzel K, Burkart MD. Sulfonyl 3-alkynyl pantetheinamides as mechanism-based cross-linkers of acyl carrier protein dehydratase. J Am Chem Soc 2013; 135:8846-9. [PMID: 23718183 DOI: 10.1021/ja4042059] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Acyl carrier proteins (ACPs) play a central role in acetate biosynthetic pathways, serving as tethers for substrates and growing intermediates. Activity and structural studies have highlighted the complexities of this role, and the protein-protein interactions of ACPs have recently come under scrutiny as a regulator of catalysis. As existing methods to interrogate these interactions have fallen short, we have sought to develop new tools to aid their study. Here we describe the design, synthesis, and application of pantetheinamides that can cross-link ACPs with catalytic β-hydroxy-ACP dehydratase (DH) domains by means of a 3-alkynyl sulfone warhead. We demonstrate this process by application to the Escherichia coli fatty acid synthase and apply it to probe protein-protein interactions with noncognate carrier proteins. Finally, we use solution-phase protein NMR spectroscopy to demonstrate that sulfonyl 3-alkynyl pantetheinamide is fully sequestered by the ACP, indicating that the crypto-ACP closely mimics the natural DH substrate. This cross-linking technology offers immediate potential to lock these biosynthetic enzymes in their native binding states by providing access to mechanistically cross-linked enzyme complexes, presenting a solution to ongoing structural challenges.
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Affiliation(s)
- Fumihiro Ishikawa
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA
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40
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Rothmann M, Kang M, Villa R, Ntai I, La Clair JJ, Kelleher NL, Chapman E, Burkart MD. Metabolic perturbation of an essential pathway: evaluation of a glycine precursor of coenzyme A. J Am Chem Soc 2013; 135:5962-5. [PMID: 23550886 DOI: 10.1021/ja400795m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Pantetheine and its corresponding disulfide pantethine play a key role in metabolism as building blocks of coenzyme A (CoA), an essential cofactor utilized in ~4% of primary metabolism and central to fatty acid, polyketide, and nonribosomal peptide synthases. Using a combination of recombinant engineering and chemical synthesis, we show that the disulfide of N-pantoylglycyl-2-aminoethanethiol (GlyPan), with one fewer carbon than pantetheine, can rescue a mutant E. coli strain MG1655ΔpanC lacking a functional pantothenate synthetase. Using mass spectrometry, we show that the GlyPan variant is accepted by the downstream CoA biosynthetic machinery, ultimately being incorporated into essential acyl carrier proteins. These findings point to further flexibility in CoA-dependent pathways and offer the opportunity to incorporate orthogonal analogues.
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Affiliation(s)
- Michael Rothmann
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA
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