1
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Pham TL, Thomas F. Design of Functional Globular β-Sheet Miniproteins. Chembiochem 2024; 25:e202300745. [PMID: 38275210 DOI: 10.1002/cbic.202300745] [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: 10/31/2023] [Revised: 01/25/2024] [Accepted: 01/26/2024] [Indexed: 01/27/2024]
Abstract
The design of discrete β-sheet peptides is far less advanced than e. g. the design of α-helical peptides. The reputation of β-sheet peptides as being poorly soluble and aggregation-prone often hinders active design efforts. Here, we show that this reputation is unfounded. We demonstrate this by looking at the β-hairpin and WW domain. Their structure and folding have been extensively studied and they have long served as model systems to investigate protein folding and folding kinetics. The resulting fundamental understanding has led to the development of hyperstable β-sheet scaffolds that fold at temperatures of 100 °C or high concentrations of denaturants. These have been used to design functional miniproteins with protein or nucleic acid binding properties, in some cases with such success that medical applications are conceivable. The β-sheet scaffolds are not always completely rigid, but can be specifically designed to respond to changes in pH, redox potential or presence of metal ions. Some engineered β-sheet peptides also exhibit catalytic properties, although not comparable to those of natural proteins. Previous reviews have focused on the design of stably folded and non-aggregating β-sheet sequences. In our review, we now also address design strategies to obtain functional miniproteins from β-sheet folding motifs.
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Affiliation(s)
- Truc Lam Pham
- Truc Lam Pham, Prof. Dr. Franziska Thomas, Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Franziska Thomas
- Truc Lam Pham, Prof. Dr. Franziska Thomas, Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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2
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Tram NDT, Selvarajan V, Boags A, Mukherjee D, Marzinek JK, Cheng B, Jiang ZC, Goh P, Koh JJ, Teo JWP, Bond PJ, Ee PLR. Manipulating turn residues on de novo designed β-hairpin peptides for selectivity against drug-resistant bacteria. Acta Biomater 2021; 135:214-224. [PMID: 34506975 DOI: 10.1016/j.actbio.2021.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 09/02/2021] [Accepted: 09/02/2021] [Indexed: 11/19/2022]
Abstract
Synthetic β-hairpin antimicrobial peptides (AMPs) offer a useful source for the development of novel antimicrobial agents. β-hairpin peptides generally consist of two side strands bridged by a reverse turn. In literature, most studies focused on the modifications of the side strands to manipulate the stability and activity of β-hairpin peptides, and much less is known about the impact of the turn region. By designing a series of de novo β-hairpin peptides with identical side strands but varied turns, we demonstrated that mutations of only 2 to 4 amino acids at the turn region could impart a wide range of antimicrobial profiles among synthetic β-hairpin AMPs. BTT2-4 and BTT6 displayed selective potency against Gram-negative bacteria, with minimum inhibitory concentrations (MICs) of 4-8 µM. In contrast, BTT1 exhibited broad-spectrum activity, with MICs of 4-8 µM against both Gram-positive and Gram-negative strains. Additionally, BTT1 was potent against methicillin-resistant Staphylococcus aureus (MRSA) and colistin-resistant Enterobacterales. The antimicrobial potency of BTT1 persisted after 14 days of serial passage. Mechanistic studies revealed that interactions between lipopolysaccharide (LPS) and the peptides were critical to their membranolytic activity against the bacterial inner membrane. Aside from folding stability, we observed that a degree of conformational flexibility was required for disruptive membrane interactions. STATEMENT OF SIGNIFICANCE: By examining the significance of the turn region of β-hairpin peptides, we present valuable knowledge to the design toolkit of novel antimicrobial peptides as alternative therapeutics to overcome antibiotic resistance. Our de novo designed synthetic peptides displayed selective activity against Gram-negative bacteria and potent activity against clinically relevant antibiotic-resistant strains (e.g. colistin-resistant Enterobacterales and methicillin-resistant Staphylococcus aureus). The bactericidal activity of our peptides was shown to be robust in the presence of proteolytic trypsin and saline, conditions that could suppress peptide activity. Our peptides were also determined to be non-cytotoxic against a human cell line.
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Affiliation(s)
- Nhan D T Tram
- Department of Pharmacy, National University of Singapore, 117543, Singapore, Singapore
| | - Vanitha Selvarajan
- Department of Pharmacy, National University of Singapore, 117543, Singapore, Singapore
| | - Alister Boags
- Bioinformatics Institute, Agency of Science, Technology and Research (A*STAR), 138671, Singapore, Singapore; School of Chemistry, University of Southampton, SO17 1BJ, Southampton, United Kingdom
| | - Devika Mukherjee
- Department of Pharmacy, National University of Singapore, 117543, Singapore, Singapore
| | - Jan K Marzinek
- Bioinformatics Institute, Agency of Science, Technology and Research (A*STAR), 138671, Singapore, Singapore
| | - Bernadette Cheng
- Department of Laboratory Medicine, Microbiology Unit, National University Hospital, 119074, Singapore , Singapore
| | - Zi-Chen Jiang
- Department of Pharmacology and Toxicology, University of Toronto, M5S 1A1, Ontario, Canada
| | - Pascal Goh
- Department of Pharmacy, National University of Singapore, 117543, Singapore, Singapore
| | - Jun-Jie Koh
- Department of Pharmacy, National University of Singapore, 117543, Singapore, Singapore
| | - Jeanette W P Teo
- Department of Laboratory Medicine, Microbiology Unit, National University Hospital, 119074, Singapore , Singapore
| | - Peter J Bond
- Bioinformatics Institute, Agency of Science, Technology and Research (A*STAR), 138671, Singapore, Singapore; National University of Singapore, Department of Biological Sciences, 117558, Singapore, Singapore
| | - Pui Lai Rachel Ee
- Department of Pharmacy, National University of Singapore, 117543, Singapore, Singapore; NUS Graduate School for Integrative Sciences and Engineering, 119077, Singapore, Singapore.
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3
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Liu X, Waters R, Gilbert HE, Barroso GT, Boyle KM, Witus LS. The role of β-hairpin conformation in ester hydrolysis peptide catalysts based on a TrpZip scaffold. RSC Adv 2021; 11:23714-23718. [PMID: 34354822 PMCID: PMC8285361 DOI: 10.1039/d1ra04288b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 06/24/2021] [Indexed: 11/21/2022] Open
Abstract
To explore the role of peptide conformation on catalytic activity in the context of ester hydrolysis catalysts, pairs of sequences were designed that contained or lacked β-hairpin character. For the hydrolysis of para-nitrophenylacetate in aqueous media, we found small but consistent trends wherein His-containing sequences based on a TrpZip scaffold showed higher catalytic activity without β-hairpin character.
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Affiliation(s)
- Xinyu Liu
- Department of Chemistry, University of Wisconsin-Madison Madison Wisconsin 53706 USA
| | - Riley Waters
- Department of Chemistry, Macalester College Saint Paul Minnesota 55105 USA
| | - Hannah E Gilbert
- Department of Chemistry, Macalester College Saint Paul Minnesota 55105 USA
| | - Gage T Barroso
- Department of Chemistry, Macalester College Saint Paul Minnesota 55105 USA
| | - Kelsey M Boyle
- Department of Chemistry, Macalester College Saint Paul Minnesota 55105 USA
| | - Leah S Witus
- Department of Chemistry, Macalester College Saint Paul Minnesota 55105 USA
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4
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Small and Simple, yet Sturdy: Conformationally Constrained Peptides with Remarkable Properties. Int J Mol Sci 2021; 22:ijms22041611. [PMID: 33562633 PMCID: PMC7915549 DOI: 10.3390/ijms22041611] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 02/01/2021] [Accepted: 02/02/2021] [Indexed: 12/20/2022] Open
Abstract
The sheer size and vast chemical space (i.e., diverse repertoire and spatial distribution of functional groups) underlie peptides’ ability to engage in specific interactions with targets of various structures. However, the inherent flexibility of the peptide chain negatively affects binding affinity and metabolic stability, thereby severely limiting the use of peptides as medicines. Imposing conformational constraints to the peptide chain offers to solve these problems but typically requires laborious structure optimization. Alternatively, libraries of constrained peptides with randomized modules can be screened for specific functions. Here, we present the properties of conformationally constrained peptides and review rigidification chemistries/strategies, as well as synthetic and enzymatic methods of producing macrocyclic peptides. Furthermore, we discuss the in vitro molecular evolution methods for the development of constrained peptides with pre-defined functions. Finally, we briefly present applications of selected constrained peptides to illustrate their exceptional properties as drug candidates, molecular recognition probes, and minimalist catalysts.
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5
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Huang KY, Yu CC, Horng JC. Conjugating Catalytic Polyproline Fragments with a Self-Assembling Peptide Produces Efficient Artificial Hydrolases. Biomacromolecules 2020; 21:1195-1201. [PMID: 31951389 DOI: 10.1021/acs.biomac.9b01620] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A polyproline fragment containing a catalytic dyad of His-His or Ser-His was coupled with a self-assembling peptide MAX1 to design new hydrolases (H2H5 and H2S5) for catalyzing ester hydrolysis. Circular dichroism measurements indicated that the peptides change their conformation from random coils to β-sheets when pH increases from 5 to 10. IR spectra also displayed the vibration modes corresponding to their β-structures at pH 9.0. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) measurements showed that in solution, the designed peptides self-assemble into network fibrils having a significantly increased catalytic efficiency on ester hydrolysis. On p-nitrophenyl acetate (p-NPA) substrate, the designed peptides exhibit high catalytic efficiency at pH 9.0 (kcat/KM = 12.1 M-1 s-1 for H2H5, 13.3 M-1 s-1 for H2S5), and their efficiency is even better at pH 10.0 (kcat/KM = 24.3 M-1 s-1 for H2H5, 99.4 M-1 s-1 for H2S5). Additionally, H2H5 and H2S5 also display good activity on catalyzing the hydrolysis of p-nitrophenyl-(2-phenyl)-propanoate (p-NPP) and p-nitrophenyl methoxyacetate (p-NPMA). Combining the polyproline-based catalytic scaffold with a self-assembling peptide generates an efficient hydrolase, providing a new design for effective artificial enzymes.
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Affiliation(s)
- Kuei-Yen Huang
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.C
| | - Chi-Ching Yu
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.C
| | - Jia-Cherng Horng
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.C.,Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan, R.O.C
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6
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Affiliation(s)
- Shinji Yamada
- Department of Chemistry, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo-ku, Tokyo 112-8610, Japan
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7
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Mahalakshmi R. Aromatic interactions in β-hairpin scaffold stability: A historical perspective. Arch Biochem Biophys 2018; 661:39-49. [PMID: 30395808 DOI: 10.1016/j.abb.2018.11.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 10/31/2018] [Accepted: 11/01/2018] [Indexed: 01/21/2023]
Abstract
Non-covalent interactions between naturally occurring aromatic residues have been widely exploited as scaffold stabilizing agents in de novo designed peptides and in Nature - inspired structures. Our understanding of the factors driving aromatic interactions and their observed interaction geometries have advanced remarkably with improvements in conventional structural studies, availability of novel molecular methods and in silico studies, which have together provided atomistic information on aromatic interactions and interaction strengths. This review attempts to recapitulate the early advances in our understanding of aromatic interactions as stabilizing agents of peptide β-hairpins.
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Affiliation(s)
- Radhakrishnan Mahalakshmi
- Molecular Biophysics Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, 462066, India.
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8
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Pham GH, Ou W, Bursulaya B, DiDonato M, Herath A, Jin Y, Hao X, Loren J, Spraggon G, Brock A, Uno T, Geierstanger BH, Cellitti SE. Tuning a Protein-Labeling Reaction to Achieve Highly Site Selective Lysine Conjugation. Chembiochem 2018; 19:799-804. [PMID: 29388367 DOI: 10.1002/cbic.201700611] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Indexed: 12/18/2022]
Abstract
Activated esters are widely used to label proteins at lysine side chains and N termini. These reagents are useful for labeling virtually any protein, but robust reactivity toward primary amines generally precludes site-selective modification. In a unique case, fluorophenyl esters are shown to preferentially label human kappa antibodies at a single lysine (Lys188) within the light-chain constant domain. Neighboring residues His189 and Asp151 contribute to the accelerated rate of labeling at Lys188 relative to the ≈40 other lysine sites. Enriched Lys188 labeling can be enhanced from 50-70 % to >95 % by any of these approaches: lowering reaction temperature, applying flow chemistry, or mutagenesis of specific residues in the surrounding protein environment. Our results demonstrated that activated esters with fluoro-substituted aromatic leaving groups, including a fluoronaphthyl ester, can be generally useful reagents for site-selective lysine labeling of antibodies and other immunoglobulin-type proteins.
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Affiliation(s)
- Grace H Pham
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Weijia Ou
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Badry Bursulaya
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Michael DiDonato
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Ananda Herath
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Yunho Jin
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Xueshi Hao
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Jon Loren
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Glen Spraggon
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Ansgar Brock
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Tetsuo Uno
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Bernhard H Geierstanger
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
| | - Susan E Cellitti
- Genomics Institute of the Novartis Research Foundation (GNF), Biotherapeutics & Biotechnology, 10675 John Jay Hopkins Drive, San Diego, CA, 92121, USA
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9
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Hung PY, Chen YH, Huang KY, Yu CC, Horng JC. Design of Polyproline-Based Catalysts for Ester Hydrolysis. ACS OMEGA 2017; 2:5574-5581. [PMID: 31457823 PMCID: PMC6644415 DOI: 10.1021/acsomega.7b00928] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 08/24/2017] [Indexed: 05/21/2023]
Abstract
A number of simple oligopeptides have been recently developed as minimalistic catalysts for mimicking the activity and selectivity of natural proteases. Although the arrangement of amino acid residues in natural enzymes provides a strategy for designing artificial enzymes, creating catalysts with efficient binding and catalytic activity is still challenging. In this study, we used the polyproline scaffold and designed a series of 13-residue peptides with a catalytic dyad or triad incorporated to serve as artificial enzymes. Their catalytic efficiency on ester hydrolysis was evaluated by ultraviolet-visible spectroscopy using the p-nitrophenyl acetate assay, and their secondary structures were also characterized by circular dichroism spectroscopy. The results indicate that a well-formed polyproline II structure may result in a much higher catalytic efficiency. This is the first report to show that a functional dyad or triad engineered into a polyproline helix framework can enhance the catalytic activity on ester hydrolysis. Our study has also revealed the necessity of maintaining an ordered structure and a well-organized catalytic site for effective biocatalysts.
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Affiliation(s)
- Pei-Yu Hung
- Department
of Chemistry and Frontier Research Center on Fundamental and
Applied Science of Matters, National Tsing
Hua University, 101 Sec. 2 Kuang-Fu Rd., Hsinchu, Taiwan 30013, ROC
| | - Yu-Han Chen
- Department
of Chemistry and Frontier Research Center on Fundamental and
Applied Science of Matters, National Tsing
Hua University, 101 Sec. 2 Kuang-Fu Rd., Hsinchu, Taiwan 30013, ROC
| | - Kuei-Yen Huang
- Department
of Chemistry and Frontier Research Center on Fundamental and
Applied Science of Matters, National Tsing
Hua University, 101 Sec. 2 Kuang-Fu Rd., Hsinchu, Taiwan 30013, ROC
| | - Chi-Ching Yu
- Department
of Chemistry and Frontier Research Center on Fundamental and
Applied Science of Matters, National Tsing
Hua University, 101 Sec. 2 Kuang-Fu Rd., Hsinchu, Taiwan 30013, ROC
| | - Jia-Cherng Horng
- Department
of Chemistry and Frontier Research Center on Fundamental and
Applied Science of Matters, National Tsing
Hua University, 101 Sec. 2 Kuang-Fu Rd., Hsinchu, Taiwan 30013, ROC
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10
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Waters ML. From supramolecular chemistry to the nucleosome: studies in biomolecular recognition. Beilstein J Org Chem 2016; 12:1863-1869. [PMID: 27829892 PMCID: PMC5082656 DOI: 10.3762/bjoc.12.175] [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: 05/24/2016] [Accepted: 07/05/2016] [Indexed: 11/23/2022] Open
Abstract
This review highlights the author’s indirect path to research at the interface of supramolecular chemistry and chemical biology.
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Affiliation(s)
- Marcey L Waters
- Department of Chemistry, CB 3290, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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11
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Akagawa K, Satou J, Kudo K. Exploration of Structural Frameworks for Reactive and Enantioselective Peptide Catalysts by Library Screenings. J Org Chem 2016; 81:9396-9401. [DOI: 10.1021/acs.joc.6b01591] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kengo Akagawa
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Junichi Satou
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Kazuaki Kudo
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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12
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Akagawa K, Iwasaki Y, Kudo K. Library Screening in Aqueous Media To Develop a Highly Active Peptide Catalyst for Enantioselective Michael Addition of a Malonate. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600828] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kengo Akagawa
- Institute of Industrial Science; University of Tokyo; 4-6-1 Komaba, Meguro-ku 153-8505 Tokyo Japan
| | - Yumika Iwasaki
- Institute of Industrial Science; University of Tokyo; 4-6-1 Komaba, Meguro-ku 153-8505 Tokyo Japan
| | - Kazuaki Kudo
- Institute of Industrial Science; University of Tokyo; 4-6-1 Komaba, Meguro-ku 153-8505 Tokyo Japan
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13
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Madhusudan Makwana K, Mahalakshmi R. Implications of aromatic-aromatic interactions: From protein structures to peptide models. Protein Sci 2015; 24:1920-33. [PMID: 26402741 DOI: 10.1002/pro.2814] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 09/17/2015] [Accepted: 09/18/2015] [Indexed: 12/11/2022]
Abstract
With increasing structural information on proteins, the opportunity to understand physical forces governing protein folding is also expanding. One of the significant non-covalent forces between the protein side chains is aromatic-aromatic interactions. Aromatic interactions have been widely exploited and thoroughly investigated in the context of folding, stability, molecular recognition, and self-assembly processes. Through this review, we discuss the contribution of aromatic interactions to the activity and stability of thermophilic, mesophilic, and psychrophilic proteins. Being hydrophobic, aromatic amino acids tend to reside in the protein hydrophobic interior or transmembrane segments of proteins. In such positions, it can play a diverse role in soluble and membrane proteins, and in α-helix and β-sheet stabilization. We also highlight here some excellent investigations made using peptide models and several approaches involving aryl-aryl interactions, as an increasingly popular strategy in protein and peptide engineering. A recent survey described the existence of aromatic clusters (trimer, tetramer, pentamer, and higher order assemblies), revealing the self-associating property of aryl groups, even in folded protein structures. The application of this self-assembly of aromatics in the generation of modern bionanomaterials is also discussed.
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Affiliation(s)
- Kamlesh Madhusudan Makwana
- Molecular Biophysics Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, 462023, India
| | - Radhakrishnan Mahalakshmi
- Molecular Biophysics Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, 462023, India
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14
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Hu XM, Zhang DX, Zhang SY, Wang PA. Highly modular dipeptide-like organocatalysts for direct asymmetric aldol reactions in brine. RSC Adv 2015. [DOI: 10.1039/c5ra07019h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The dipeptide-like organocatalysts have been developed for asymmetric aldol reactions in brine to achieve high yields and enantioselectivities with 1 mol% catalyst-loading.
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Affiliation(s)
- Xiao-Mu Hu
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
| | - Dong-Xu Zhang
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
| | - Sheng-Yong Zhang
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
| | - Ping-An Wang
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
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15
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Giuliano MW, Miller SJ. Site-Selective Reactions with Peptide-Based Catalysts. SITE-SELECTIVE CATALYSIS 2015; 372:157-201. [DOI: 10.1007/128_2015_653] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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16
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Matsumoto M, Lee SJ, Waters ML, Gagné MR. A catalyst selection protocol that identifies biomimetic motifs from β-hairpin libraries. J Am Chem Soc 2014; 136:15817-20. [PMID: 25347708 DOI: 10.1021/ja503012g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Assaying a solid-phase library of histidine-containing β-hairpin peptides by a reactive tagging scheme in organic solvents selects for catalysts that reproduce the strategies used by His-based enzyme active sites to accelerate acyl- and phosphonyl-transfer reactions. Rate accelerations (k(rel)) in organic solvents of up to 2.4 × 10(8) are observed.
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Affiliation(s)
- Masaomi Matsumoto
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
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