1
|
Agarwal R, Smith JC. Speed vs Accuracy: Effect on Ligand Pose Accuracy of Varying Box Size and Exhaustiveness in AutoDock Vina. Mol Inform 2023; 42:e2200188. [PMID: 36262028 DOI: 10.1002/minf.202200188] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 10/19/2022] [Indexed: 11/11/2022]
Abstract
Structure-based virtual high-throughput screening involves docking chemical libraries to targets of interest. A parameter pertinent to the accuracy of the resulting pose is the root mean square deviation (RMSD) from a known crystallographic structure, i. e., the 'docking power'. Here, using a popular algorithm, Autodock Vina, as a model program, we evaluate the effects of varying two common docking parameters: the box size (the size of docking search space) and the exhaustiveness of the global search (the number of independent runs starting from random ligand conformations) on the RMSD from the PDBbind v2017 refined dataset of experimental protein-ligand complexes. Although it is clear that exhaustiveness is an important parameter, there is wide variation in the values used, with variation between 1 and >100. We, therefore, evaluated a combination of cubic boxes of different sizes and five exhaustiveness values (1, 8, 25, 50, 75, 100) within the range of those commonly adopted. The results show that the default exhaustiveness value of 8 performs well overall for most box sizes. In contrast, for all box sizes, but particularly for large boxes, an exhaustiveness value of 1 led to significantly higher median RMSD (mRMSD) values. The docking power was slightly improved with an exhaustiveness of 25, but the mRMSD changes little with values higher than 25. Therefore, although low exhaustiveness is computationally faster, the results are more likely to be far from reality, and, conversely, values >25 led to little improvement at the expense of computational resources. Overall, we recommend users to use at least the default exhaustiveness value of 8 for virtual screening calculations.
Collapse
Affiliation(s)
- Rupesh Agarwal
- UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6309, USA.,Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, 14311 Cumberland Avenue, Knoxville, TN 37996-1939, USA
| | - Jeremy C Smith
- UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6309, USA.,Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, 14311 Cumberland Avenue, Knoxville, TN 37996-1939, USA
| |
Collapse
|
2
|
Nami F, Mojarrad AG, Zakavi S. Short time biomimetic oxidation of styrene with aqueous hydrogen peroxide: Crucial roles played by acetic acid. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
3
|
Wilk M, Ostaszewski R. Efficient Assay for the Detection of Hydrogen Peroxide by Estimating Enzyme Promiscuous Activity in the Perhydrolysis Reaction. Chembiochem 2021. [DOI: 10.1002/cbic.202000770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Monika Wilk
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| | - Ryszard Ostaszewski
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland
| |
Collapse
|
4
|
Dingwoke EJ, Adamude FA, Chukwuocha CE, Ambi AA, Nwobodo NN, Sallau AB, Nzelibe HC. Inhibition of Trypanosoma evansi Protein-Tyrosine Phosphatase by Myristic Acid Analogues Isolated from Khaya senegalensis and Tamarindus indica. J Exp Pharmacol 2020; 11:135-148. [PMID: 31908547 PMCID: PMC6927228 DOI: 10.2147/jep.s226632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 11/08/2019] [Indexed: 12/04/2022] Open
Abstract
Background Trypanosome infections still pose severe health and economic consequences, especially in the endemic regions of Sub-Saharan Africa. Trypanosome differentiation to the procyclic forms which lack the immune evasion mechanisms for survival in the bloodstream is prevented by tyrosine dephosphorylation which is catalyzed by protein-tyrosine phosphatase; thereby promoting survival of the parasites in the host. Inhibition of Protein-tyrosine phosphatase is a strategic therapeutic target that could attenuate trypanosomiasis. This study investigated the in vitro inhibitory effect of stem bark extracts of Khaya senegalensis and Tamarindus indica on the enzymatic activity of protein-tyrosine phosphatase. Methods All determinations were carried out following standard procedures for analytical experiments. The analogues of myristic acid that inhibited the enzymatic activity of protein-tyrosine phosphatase were isolated by bioassay-guided fractionation of stem bark extracts of Khaya senegalensis and Tamarindus indica. Results Analogues of myristic acid proved to be potent inhibitors of protein-tyrosine phosphatase. Double reciprocal (Lineweaver–Burk) plots of the initial velocity data indicated non-competitive inhibition with Ki of 0.67 mg/mL for Khaya senegalensis and 2.17 mg/mL for Tamarindus indica. The kinetic parameters for the cleavage of para-nitrophenylphosphate by the enzyme showed a KM of 3.44 mM and Vmax of 0.19 µmol/min. Sodium orthovanadate, the enzymes’ specific inhibitor, inhibited the enzyme competitively with Ki of 0.20 mg/mL. Gas chromatography-mass spectrometry analysis of the stem bark bioactive fractions of Khaya senegalensis and Tamarindus indica revealed the presence of myristic acid analogues. Conclusion Analogues of myristic acid are potent inhibitors of protein-tyrosine phosphatase that could be developed as trypanocide to inhibit the enzymatic activity of protein-tyrosine phosphatase in order to prevent transmission of trypanosomes.
Collapse
Affiliation(s)
- Emeka John Dingwoke
- Department of Biochemistry, Faculty of Life Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
| | - Fatima Amin Adamude
- Department of Biochemistry, Faculty of Medical Sciences, Federal University Lafia, Nasarawa State, Nigeria
| | - Chimee Ethel Chukwuocha
- Department of Biochemistry, Faculty of Life Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
| | - Ahmed Adamu Ambi
- Department of Biochemistry, Faculty of Life Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
| | - Nwobodo Ndubuisi Nwobodo
- Department of Pharmacology and Therapeutics, College of Medicine, Enugu State University of Science and Technology, Enugu, Enugu State, Nigeria.,Department of Pharmacology and Therapeutics, College of Health Sciences, Nile University of Nigeria, Abuja, Nigeria
| | - Abdullahi Balarabe Sallau
- Department of Biochemistry, Faculty of Life Sciences, Ahmadu Bello University, Zaria, Kaduna State, Nigeria
| | | |
Collapse
|
5
|
Huang Q, He C, Zhang J, Li W, Fu Y. Unlocking the hidden talent of DNA: Unexpected catalytic activity for colorimetric assay of alkaline phosphatase. Anal Chim Acta 2018; 1055:98-105. [PMID: 30782376 DOI: 10.1016/j.aca.2018.12.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 12/11/2018] [Accepted: 12/14/2018] [Indexed: 01/22/2023]
Abstract
Carboxylic acids have been efficiently used to activate H2O2 to form even more potent oxidant-peroxy acids through enzyme-catalyzed processes. By employing acetic acid as the activator, herein we report for the first time that cofactor-free DNA displays unexpected activity in H2O2-mediated oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) under mild conditions. A series of 10-nt oligonucleotides were rationally designed with various combinations of double nucleotides including TG, AG, CG, TA and AC respectively, which demonstrates that the catalytic performance of DNA is highly dependent upon the sequence composition, strand length and continuous nucleotides. Inspired by phosphate-induced inhibition effects on the formation of peracetic acid, an ultrasensitive assay was well-established for monitoring alkaline phosphatase (ALP) on the basis of double terminal-phosphorylated G-rich oligonucleotides. Phosphorylated DNA not only serves as the substrate for ALP-catalyzed hydrolysis, but also acts as the enzyme-like catalyst for signal amplification. Quantitative determination of ALP is realized in a linear range from 0.05 to 15 mU/mL, resulting in the limit of detection of 0.01 mU/mL. The rapid and reliable test also has great potential in analyzing serum samples for practical disease diagnosis.
Collapse
Affiliation(s)
- Qingwei Huang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Chuan He
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Jinli Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China
| | - Wei Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China.
| | - Yan Fu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, PR China.
| |
Collapse
|
6
|
Garcia FJ, Carroll KS. An immunochemical approach to detect oxidized protein tyrosine phosphatases using a selective C-nucleophile tag. MOLECULAR BIOSYSTEMS 2017; 12:1790-8. [PMID: 26757830 DOI: 10.1039/c5mb00847f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Protein tyrosine phosphatases are crucial regulators of signal transduction and function as antagonists towards protein tyrosine kinases to control reversible tyrosine phosphorylation, thereby regulating fundamental physiological processes. Growing evidence has supported the notion that reversible oxidative inactivation of the catalytic cysteine residue in protein tyrosine phosphatases serves as an oxidative post-translational modification that regulates its activity to influence downstream signaling by promoting phosphorylation and induction of the signaling cascade. The oxidation of cysteine to the sulfenic acid is often transient and difficult to detect, thus making it problematic in understanding the role that this oxidative post-translational modification plays in redox-biology and pathogenesis. Several methods to detect cysteine oxidation in biological systems have been developed, though targeted approaches to directly detect oxidized phosphatases are still lacking. Herein we describe the development of a novel immunochemical approach to directly profile oxidized phosphatases. This immunochemical approach consists of an antibody designed to recognize the conserved sequence of the PTP active site (VHCDMDSAG) harboring the catalytic cysteine modified with dimedone (CDMD), a nucleophile that chemoselectively reacts with cysteine sulfenic acids to form a stable thioether adduct. Additionally, we provide biochemical and mass spectrometry workflows to be used in conjugation with this newly developed immunochemical approach to assist in the identification and quantification of basal and oxidized phosphatases.
Collapse
Affiliation(s)
- Francisco J Garcia
- Department of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA.
| | - Kate S Carroll
- Department of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA.
| |
Collapse
|
7
|
Kuban-Jankowska A, Gorska M, Jaremko L, Jaremko M, Tuszynski JA, Wozniak M. The physiological concentration of ferrous iron (II) alters the inhibitory effect of hydrogen peroxide on CD45, LAR and PTP1B phosphatases. Biometals 2015; 28:975-86. [PMID: 26407665 PMCID: PMC4635172 DOI: 10.1007/s10534-015-9882-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 09/22/2015] [Indexed: 11/27/2022]
Abstract
Hydrogen peroxide is an important regulator of protein tyrosine phosphatase activity via reversible oxidation. However, the role of iron in this reaction has not been yet elucidated. Here we compare the influence of hydrogen peroxide and the ferrous iron (reagent for Fenton reaction) on the enzymatic activity of recombinant CD45, LAR, PTP1B phosphatases and cellular CD45 in Jurkat cells. The obtained results show that ferrous iron (II) is potent inhibitor of CD45, LAR and PTP1B, but the inhibitory effect is concentration dependent. We found that the higher concentrations of ferrous iron (II) increase the inactivation of CD45, LAR and PTP1B phosphatase caused by hydrogen peroxide, but the addition of the physiological concentration (500 nM) of ferrous iron (II) has even a slightly preventive effect on the phosphatase activity against hydrogen peroxide.
Collapse
Affiliation(s)
| | - Magdalena Gorska
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| | - Lukasz Jaremko
- Max Planck Institute for Biophysical Chemistry and German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
| | - Mariusz Jaremko
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland.,Department of NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | | | - Michal Wozniak
- Department of Medical Chemistry, Medical University of Gdansk, Gdansk, Poland
| |
Collapse
|
8
|
Frijhoff J, Dagnell M, Godfrey R, Ostman A. Regulation of protein tyrosine phosphatase oxidation in cell adhesion and migration. Antioxid Redox Signal 2014; 20:1994-2010. [PMID: 24111825 DOI: 10.1089/ars.2013.5643] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
SIGNIFICANCE Redox-regulated control of protein tyrosine phosphatases (PTPs) through inhibitory reversible oxidation of their active site is emerging as a novel and general mechanism for control of cell surface receptor-activated signaling. This mechanism allows for a previously unrecognized crosstalk between redox regulators and signaling pathways, governed by, for example, receptor tyrosine kinases and integrins, which control cell proliferation and migration. RECENT ADVANCES A large number of different molecules, in addition to hydrogen peroxide, have been found to induce PTP inactivation, including lipid peroxides, reactive nitrogen species, and hydrogen sulfide. Characterization of oxidized PTPs has identified different types of oxidative modifications that are likely to display differential sensitivity to various reducing systems. Accumulating evidence demonstrates that PTP oxidation occurs in a temporally and spatially restricted manner. Studies in cell and animal models indicate altered PTP oxidation in models of common diseases, such as cancer and metabolic/cardiovascular disease. Novel methods have appeared that allow characterization of global PTP oxidation. CRITICAL ISSUES As the understanding of the molecular and cellular biology of PTP oxidation is developing, it will be important to establish experimental procedures that allow analyses of PTP oxidation, and its regulation, in physiological and pathophysiological settings. Future studies should also aim to establish specific connections between various oxidants, specific PTPs, and defined signaling contexts. FUTURE DIRECTIONS Modulation of PTP activity still appears as a valid strategy for correction or inhibition of dys-regulated cell signaling. Continued studies on PTP oxidation might present yet unrecognized means to exploit this regulatory mechanism for pharmacological purposes.
Collapse
Affiliation(s)
- Jeroen Frijhoff
- 1 Department of Oncology-Pathology, Karolinska Institutet , Stockholm, Sweden
| | | | | | | |
Collapse
|