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Mysegaes F, Spiteller P, Bernarding J, Plaumann M. 19 F VT NMR: Novel Tm 3+ and Ce 3+ Complexes Provide New Insight into Temperature Measurement Using Molecular Sensors. Chemphyschem 2023; 24:e202300057. [PMID: 37384817 DOI: 10.1002/cphc.202300057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 06/23/2023] [Accepted: 06/26/2023] [Indexed: 07/01/2023]
Abstract
In the past few decades, magnetic resonance spectroscopy (MRS) and MR imaging (MRI) have developed into a powerful non-invasive tool for medical diagnostic and therapy. Especially 19 F MR shows promising potential because of the properties of the fluorine atom and the negligible background signals in the MR spectra. The detection of temperature in a living organism is quite difficult, and usually external thermometers or fibers are used. Temperature determination via MRS needs temperature-sensitive contrast agents. This article reports first results of solvent and structural influences on the temperature sensitivity of 19 F NMR signals of chosen molecules. By using this chemical shift sensitivity, a local temperature can be determined with a high precision. Based on this preliminary study, we synthesized five metal complexes and compared the results of all variable temperature measurements. It is shown that the highest 19 F MR signal temperature dependence is detectable for a fluorine nucleus in a Tm3+ -complex.
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Affiliation(s)
- Felix Mysegaes
- University Bremen, Instrumental Analytics, Leobener Str. 7, 28359, Bremen, Germany
- Otto-von-Guericke University Magdeburg, Medical Faculty, Institute of Biometry and Medical Informatics, Leipziger Str. 44, 39120, Magdeburg, Germany
| | - Peter Spiteller
- University Bremen, Instrumental Analytics, Leobener Str. 7, 28359, Bremen, Germany
| | - Johannes Bernarding
- Otto-von-Guericke University Magdeburg, Medical Faculty, Institute of Biometry and Medical Informatics, Leipziger Str. 44, 39120, Magdeburg, Germany
| | - Markus Plaumann
- Otto-von-Guericke University Magdeburg, Medical Faculty, Institute of Biometry and Medical Informatics, Leipziger Str. 44, 39120, Magdeburg, Germany
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Adhikari A, Bhattarai BR, Aryal A, Thapa N, KC P, Adhikari A, Maharjan S, Chanda PB, Regmi BP, Parajuli N. Reprogramming natural proteins using unnatural amino acids. RSC Adv 2021; 11:38126-38145. [PMID: 35498070 PMCID: PMC9044140 DOI: 10.1039/d1ra07028b] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 11/18/2021] [Indexed: 12/26/2022] Open
Abstract
Unnatural amino acids have gained significant attention in protein engineering and drug discovery as they allow the evolution of proteins with enhanced stability and activity. The incorporation of unnatural amino acids into proteins offers a rational approach to engineer enzymes for designing efficient biocatalysts that exhibit versatile physicochemical properties and biological functions. This review highlights the biological and synthetic routes of unnatural amino acids to yield a modified protein with altered functionality and their incorporation methods. Unnatural amino acids offer a wide array of applications such as antibody-drug conjugates, probes for change in protein conformation and structure–activity relationships, peptide-based imaging, antimicrobial activities, etc. Besides their emerging applications in fundamental and applied science, systemic research is necessary to explore unnatural amino acids with novel side chains that can address the limitations of natural amino acids. Incorporation of unnatural amino acids into protein offers wide array of applications in fundamental and applied science.![]()
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Affiliation(s)
- Anup Adhikari
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
| | - Bibek Raj Bhattarai
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
| | - Ashika Aryal
- Department of Chemistry, Birendra Multiple Campus, Tribhuvan University, Bharatpur, Chitwan, Nepal
| | - Niru Thapa
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
| | - Puja KC
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
| | - Ashma Adhikari
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
| | - Sushila Maharjan
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
| | - Prem B. Chanda
- Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, Louisiana 70402, USA
| | - Bishnu P. Regmi
- Department of Chemistry, Florida Agricultural and Mechanical University, Tallahassee, Florida 32307, USA
| | - Niranjan Parajuli
- Biological Chemistry Lab, Central Department of Chemistry, Tribhuvan University, Kritipur, 44618, Kathmandu, Nepal
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Kumar V, Saha A, Roy K. In silico modeling for dual inhibition of acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) enzymes in Alzheimer's disease. Comput Biol Chem 2020; 88:107355. [PMID: 32801088 DOI: 10.1016/j.compbiolchem.2020.107355] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/29/2020] [Accepted: 07/30/2020] [Indexed: 01/11/2023]
Abstract
In this research, we have implemented two-dimensional quantitative structure-activity relationship (2D-QSAR) modeling using two different datasets, namely, acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) enzyme inhibitors. A third dataset has been derived based on their selectivity and used for the development of partial least squares (PLS) based regression models. The developed models were extensively validated using various internal and external validation parameters. The features appearing in the model against AChE enzyme suggest that a small ring size, higher number of -CH2- groups, higher number of secondary aromatic amines and higher number of aromatic ketone groups may contribute to the inhibitory activity. The features obtained from the model against BuChE enzyme suggest that the sum of topological distances between two nitrogen atoms, higher number of fragments X-C(=X)-X, higher number of secondary aromatic amides, fragment R--CR-X may be more favorable for inhibition. The features obtained from selectivity based model suggest that the number of aromatic ethers, unsaturation content relative to the molecular size and molecular shape may be more specific for the inhibition of the AChE enzyme in comparison to the BuChE enzyme. Moreover, we have implemented the molecular docking studies using the most and least active molecules from the datasets in order to identify the binding pattern between ligand and target enzyme. The obtained information is then correlated with the essential structural features associated with the 2D-QSAR models.
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Affiliation(s)
- Vinay Kumar
- Drug Theoretics and Cheminformatics Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India
| | - Achintya Saha
- Department of Chemical Technology, University of Calcutta, 92 A P C Road, Kolkata 700 009, India
| | - Kunal Roy
- Drug Theoretics and Cheminformatics Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata 700032, India.
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Zou H, Li L, Zhang T, Shi M, Zhang N, Huang J, Xian M. Biosynthesis and biotechnological application of non-canonical amino acids: Complex and unclear. Biotechnol Adv 2018; 36:1917-1927. [PMID: 30063950 DOI: 10.1016/j.biotechadv.2018.07.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 06/22/2018] [Accepted: 07/27/2018] [Indexed: 01/05/2023]
Abstract
Compared with the better-studied canonical amino acids, the distribution, metabolism and functions of natural non-canonical amino acids remain relatively obscure. Natural non-canonical amino acids have been mainly discovered in plants as secondary metabolites that perform diversified physiological functions. Due to their specific characteristics, a broader range of natural and artificial non-canonical amino acids have recently been applied in the development of functional materials and pharmaceutical products. With the rapid development of advanced methods in biotechnology, non-canonical amino acids can be incorporated into peptides, proteins and enzymes to improve the function and performance relative to their natural counterparts. Therefore, biotechnological application of non-canonical amino acids in artificial bio-macromolecules follows the central goal of synthetic biology to: create novel life forms and functions. However, many of the non-canonical amino acids are synthesized via chemo- or semi-synthetic methods, and few non-canonical amino acids can be synthesized using natural in vivo pathways. Therefore, further research is needed to clarify the metabolic pathways and key enzymes of the non-canonical amino acids. This will lead to the discovery of more candidate non-canonical amino acids, especially for those that are derived from microorganisms and are naturally bio-compatible with chassis strains for in vivo biosynthesis. In this review, we summarize representative natural and artificial non-canonical amino acids, their known information regarding associated metabolic pathways, their characteristics and their practical applications. Moreover, this review summarizes current barriers in developing in vivo pathways for the synthesis of non-canonical amino acids, as well as other considerations, future trends and potential applications of non-canonical amino acids in advanced biotechnology.
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Affiliation(s)
- Huibin Zou
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China; CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
| | - Lei Li
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Tongtong Zhang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Mengxun Shi
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Nan Zhang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Jingling Huang
- College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Mo Xian
- CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
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Horáková E, Drabina P, Brůčková L, Štěpánková Š, Vorčáková K, Sedlák M. Synthesis and in vitro evaluation of novel N-cycloalkylcarbamates as potential cholinesterase inhibitors. Monatsh Chem 2017; 148:2143-53. [DOI: 10.1007/s00706-017-2026-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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