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Travis CR, Dumais RG, Treacy JW, Kean KM, Houk KN, Waters ML. Contribution of Electrostatic CH 3-π Interactions to Recognition of Histone Asymmetric Dimethylarginine by the SPIN1 Triple Tudor Domain. J Am Chem Soc 2024; 146:20678-20684. [PMID: 39023428 DOI: 10.1021/jacs.4c03463] [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: 07/20/2024]
Abstract
Methylation of arginine (Arg) residues on histones creates a new binding epitope, enabling recognition by aromatic cage binding pockets in Tudor domains; these protein-protein interactions (PPIs) govern gene expression. Despite their biological importance, the molecular details of methylated Arg recognition are poorly understood. While the desolvation, hydrogen bonding, and guanidinium stacking of methylated Arg have been explored in model systems and proposed to contribute to binding, direct interactions between the methyl groups and the aromatic residues in the binding pocket have not previously been investigated. Herein, we mechanistically study the CH3-π interactions between the SPIN1 triple Tudor domain and histone asymmetric dimethylarginine. We find that these CH3-π interactions are electrostatically tunable, exhibiting cation-π character, albeit attenuated relative to cation-π interactions with quaternary ammonium ions, offering key insight into how methylation of Arg alters its binding epitope to enable new PPIs.
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Affiliation(s)
- Christopher R Travis
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ryan G Dumais
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Joseph W Treacy
- Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095-1569, United States
| | - Kelsey M Kean
- Department of Chemistry, High Point University, High Point, North Carolina 27268, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095-1569, United States
| | - Marcey L Waters
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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Koch NG, Budisa N. Evolution of Pyrrolysyl-tRNA Synthetase: From Methanogenesis to Genetic Code Expansion. Chem Rev 2024. [PMID: 38953775 DOI: 10.1021/acs.chemrev.4c00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Over 20 years ago, the pyrrolysine encoding translation system was discovered in specific archaea. Our Review provides an overview of how the once obscure pyrrolysyl-tRNA synthetase (PylRS) tRNA pair, originally responsible for accurately translating enzymes crucial in methanogenic metabolic pathways, laid the foundation for the burgeoning field of genetic code expansion. Our primary focus is the discussion of how to successfully engineer the PylRS to recognize new substrates and exhibit higher in vivo activity. We have compiled a comprehensive list of ncAAs incorporable with the PylRS system. Additionally, we also summarize recent successful applications of the PylRS system in creating innovative therapeutic solutions, such as new antibody-drug conjugates, advancements in vaccine modalities, and the potential production of new antimicrobials.
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Affiliation(s)
- Nikolaj G Koch
- Department of Chemistry, Institute of Physical Chemistry, University of Basel, 4058 Basel, Switzerland
- Department of Biosystems Science and Engineering, ETH Zurich, 4058 Basel, Switzerland
| | - Nediljko Budisa
- Biocatalysis Group, Institute of Chemistry, Technische Universität Berlin, 10623 Berlin, Germany
- Chemical Synthetic Biology Chair, Department of Chemistry, University of Manitoba, Winnipeg MB R3T 2N2, Canada
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3
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Wang M, Pan D, Zhang Q, Lei Y, Wang C, Jia H, Mou L, Miao X, Ren X, Xu Z. Site-Selective Polyfluoroaryl Modification and Unsymmetric Stapling of Unprotected Peptides. J Am Chem Soc 2024; 146:6675-6685. [PMID: 38427024 DOI: 10.1021/jacs.3c12879] [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: 03/02/2024]
Abstract
Peptide stapling is recognized as an effective strategy for improving the proteolytic stability and cell permeability of peptides. In this study, we present a novel approach for the site-selective unsymmetric perfluoroaryl stapling of Ser and Cys residues in unprotected peptides. The stapling reaction proceeds smoothly under very mild conditions, exhibiting a remarkably rapid reaction rate. It can furnish stapled products in both liquid and solid phases, and the presence of nucleophilic groups other than Cys thiol within the peptide does not impede the reaction, resulting in uniformly high yields. Importantly, the chemoselective activation of Ser β-C(sp3)-H enables the unreacted -OH to serve as a reactive handle for subsequent divergent modification of the staple moiety with various therapeutic functionalities, including a clickable azido group, a polar moiety, a lipid tag, and a fluorescent dye. In our study, we have also developed a visible-light-induced chemoselective C(sp3)-H polyfluoroarylation of the Ser β-position. This reaction avoids interference with the competitive reaction of Ser -OH, enabling the precise late-stage polyfluoroarylative modification of Ser residues in various unprotected peptides containing other highly reactive amino acid residues. The biological assay suggested that our peptide stapling strategy would potentially enhance the proteolytic stability and cellular permeability of peptides.
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Affiliation(s)
- Mengran Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Da Pan
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Qi Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yongjia Lei
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Chao Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Haoyuan Jia
- School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Lingyun Mou
- School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xiaokang Miao
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xiaoyu Ren
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Zhaoqing Xu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
- Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou 730000, China
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Travis CR, Kean KM, Albanese KI, Henriksen HC, Treacy JW, Chao EY, Houk KN, Waters ML. Trimethyllysine Reader Proteins Exhibit Widespread Charge-Agnostic Binding via Different Mechanisms to Cationic and Neutral Ligands. J Am Chem Soc 2024; 146:3086-3093. [PMID: 38266163 PMCID: PMC11140585 DOI: 10.1021/jacs.3c10031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2024]
Abstract
In the last 40 years, cation-π interactions have become part of the lexicon of noncovalent forces that drive protein binding. Indeed, tetraalkylammoniums are universally bound by aromatic cages in proteins, suggesting that cation-π interactions are a privileged mechanism for binding these ligands. A prominent example is the recognition of histone trimethyllysine (Kme3) by the conserved aromatic cage of reader proteins, dictating gene expression. However, two proteins have recently been suggested as possible exceptions to the conventional understanding of tetraalkylammonium recognition. To broadly interrogate the role of cation-π interactions in protein binding interactions, we report the first large-scale comparative evaluation of reader proteins for a neutral Kme3 isostere, experimental and computational mechanistic studies, and structural analysis. We find unexpected widespread binding of readers to a neutral isostere with the first examples of readers that bind the neutral isostere more tightly than Kme3. We find that no single factor dictates the charge selectivity, demonstrating the challenge of predicting such interactions. Further, readers that bind both cationic and neutral ligands differ in mechanism: binding Kme3 via cation-π interactions and the neutral isostere through the hydrophobic effect in the same aromatic cage. This discovery explains apparently contradictory results in previous studies, challenges traditional understanding of molecular recognition of tetraalkylammoniums by aromatic cages in myriad protein-ligand interactions, and establishes a new framework for selective inhibitor design by exploiting differences in charge dependence.
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Affiliation(s)
- Christopher R. Travis
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Kelsey M. Kean
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Katherine I. Albanese
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Hanne C. Henriksen
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Joseph W. Treacy
- Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90095-1569, USA
| | - Elaine Y. Chao
- Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90095-1569, USA
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, CA 90095-1569, USA
| | - Marcey L. Waters
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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Schene ME, Infield DT, Ahern CA. Expression and purification of fluorinated proteins from mammalian suspension culture. Methods Enzymol 2024; 696:341-354. [PMID: 38658087 DOI: 10.1016/bs.mie.2024.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
The site-specific encoding of noncanonical amino acids allows for the introduction of rationalized chemistry into a target protein. Of the methods that enable this technology, evolved tRNA and synthetase pairs offer the potential for expanded protein production and purification. Such an approach combines the versatility of solid-phase peptide synthesis with the scalable features of recombinant protein production. We describe the large scale production and purification of eukaryotic proteins bearing fluorinated phenylalanine in mammalian suspension cell preparations. Downstream applications of this approach include scalable recombinant protein preparation for ligand binding assays with small molecules and ligands, protein structure determination, and protein stability assays.
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Affiliation(s)
- Miranda E Schene
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA
| | - Daniel T Infield
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA
| | - Christopher A Ahern
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, IA, USA.
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Eddins AJ, Bednar RM, Jana S, Pung AH, Mbengi L, Meyer K, Perona JJ, Cooley RB, Karplus PA, Mehl RA. Truncation-Free Genetic Code Expansion with Tetrazine Amino Acids for Quantitative Protein Ligations. Bioconjug Chem 2023; 34:2243-2254. [PMID: 38047550 DOI: 10.1021/acs.bioconjchem.3c00380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Quantitative labeling of biomolecules is necessary to advance areas of antibody-drug conjugation, super-resolution microscopy imaging of molecules in live cells, and determination of the stoichiometry of protein complexes. Bio-orthogonal labeling to genetically encodable noncanonical amino acids (ncAAs) offers an elegant solution; however, their suboptimal reactivity and stability hinder the utility of this method. Previously, we showed that encoding stable 1,2,4,5-tetrazine (Tet)-containing ncAAs enables rapid, complete conjugation, yet some expression conditions greatly limited the quantitative reactivity of the Tet-protein. Here, we demonstrate that reduction of on-protein Tet ncAAs impacts their reactivity, while the leading cause of the unreactive protein is near-cognate suppression (NCS) of UAG codons by endogenous aminoacylated tRNAs. To overcome incomplete conjugation due to NCS, we developed a more catalytically efficient tRNA synthetase and developed a series of new machinery plasmids harboring the aminoacyl tRNA synthetase/tRNA pair (aaRS/tRNA pair). These plasmids enable robust production of homogeneously reactive Tet-protein in truncation-free cell lines, eliminating the contamination caused by NCS and protein truncation. Furthermore, these plasmid systems utilize orthogonal synthetic origins, which render these machinery vectors compatible with any common expression system. Through developing these new machinery plasmids, we established that the aaRS/tRNA pair plasmid copy-number greatly affects the yields and quality of the protein produced. We then produced quantitatively reactive soluble Tet-Fabs, demonstrating the utility of this system for rapid, homogeneous conjugations of biomedically relevant proteins.
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Affiliation(s)
- Alex J Eddins
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
| | - Riley M Bednar
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
| | - Subhashis Jana
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
| | - Abigail H Pung
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
| | - Lea Mbengi
- Department of Chemistry, Portland State University, Portland, Oregon 97207, United States
| | - Kyle Meyer
- Department of Chemistry, Portland State University, Portland, Oregon 97207, United States
| | - John J Perona
- Department of Chemistry, Portland State University, Portland, Oregon 97207, United States
| | - Richard B Cooley
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
| | - P Andrew Karplus
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
| | - Ryan A Mehl
- Department of Biochemistry and Biophysics, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
- GCE4All Biomedical Technology Development and Dissemination Center, Oregon State University, 2011 Agricultural and Life Sciences, Corvallis, Oregon 97331, United States
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Cui X, Xu X, Hu Y, Li R, Liu Q. Mechanism of Qiguiyin Decoction Treats Pulmonary Infection Caused by Pseudomonas aeruginosa Based on Gut Microbiota and Metabolomics. Infect Drug Resist 2023; 16:3073-3084. [PMID: 37222987 PMCID: PMC10202261 DOI: 10.2147/idr.s405033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 05/09/2023] [Indexed: 05/25/2023] Open
Abstract
Background Qiguiyin decoction (QGYD) was a traditional Chinese medicine (TCM) used to treat Pseudomonas aeruginosa infection in China. This study investigated the therapeutic effect and the potential mechanism of QGYD on carbapenem-resistant Pseudomonas aeruginosa (CRPA) infection. Materials and Methods Pulmonary infections were induced in mice by CRPA. The therapeutic effect of QGYD was evaluated by lung index and pulmonary pathology. The potential effects of QGYD on intestinal flora were detected by gut microbiome. The overall metabolism regulation of QGYD in blood was investigated by metabonomics. Next, the correlation between intestinal flora and metabolites was analyzed to illustrate the relationship between the regulatory effects of QGYD on metabolites and the beneficial effects of intestinal flora. Results QGYD has significant therapeutic effect on CRPA infection. QGYD profoundly inhibited the excessive accumulation of Deferribacteres and Mucispirillum at phylum and genus levels, respectively. Eleven potential metabolites that were abnormally expressed by CRPA infection and significantly reversed by QGYD were identified. Ten of the eleven metabolites significantly regulated by QGYD were related to Deferribacteres. Deferribacteres showed significant positive correlation with DL-lactic acid, phenylalanine and other metabolites and significant negative correlation with vitamin k1. At the genus level, Mucispirillum was closely related to metabolites significantly regulated by QGYD. Mucispirillum was positively correlated with metabolites such as Dl-lactate and negatively correlated with vitamin k1. Conclusion QGYD can improve CRPA infection and has the effect of regulating intestinal flora and metabolism. It was a promising drug against infection.
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Affiliation(s)
- Xuran Cui
- Beijing Hospital of Traditional Chinese Medicine, Capital Medical University, Beijing, 100010, People’s Republic of China
- Beijing Institute of Chinese Medicine, Beijing, 100010, People’s Republic of China
- Beijing Key Laboratory of Basic Research with Traditional Chinese Medicine on Infectious Diseases, Beijing, 100010, People’s Republic of China
| | - Xiaolong Xu
- Beijing Hospital of Traditional Chinese Medicine, Capital Medical University, Beijing, 100010, People’s Republic of China
- Beijing Institute of Chinese Medicine, Beijing, 100010, People’s Republic of China
- Beijing Key Laboratory of Basic Research with Traditional Chinese Medicine on Infectious Diseases, Beijing, 100010, People’s Republic of China
| | - Yahui Hu
- Beijing Hospital of Traditional Chinese Medicine, Capital Medical University, Beijing, 100010, People’s Republic of China
- Beijing Key Laboratory of Basic Research with Traditional Chinese Medicine on Infectious Diseases, Beijing, 100010, People’s Republic of China
| | - Rui Li
- Beijing Hospital of Traditional Chinese Medicine, Capital Medical University, Beijing, 100010, People’s Republic of China
- Beijing Key Laboratory of Basic Research with Traditional Chinese Medicine on Infectious Diseases, Beijing, 100010, People’s Republic of China
| | - Qingquan Liu
- Beijing Hospital of Traditional Chinese Medicine, Capital Medical University, Beijing, 100010, People’s Republic of China
- Beijing Institute of Chinese Medicine, Beijing, 100010, People’s Republic of China
- Beijing Key Laboratory of Basic Research with Traditional Chinese Medicine on Infectious Diseases, Beijing, 100010, People’s Republic of China
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