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Tasharofi H, Jamaat PR, Asli MD. Investigation of different substitutions, structure, charge and multiplicity spin of the iron verdoheme-rat heme oxygenase complex: a DFT study. J PORPHYR PHTHALOCYA 2021. [DOI: 10.1142/s108842462150084x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Heme oxygenase-1 (HO-1) is an inducible stress protein that degrades heme to carbon monoxide, iron and biliverdin, which subsequently reduces to bilirubin. Many parameters of verdoheme–rat heme oxygenase complex structure and their role and function on heme degradation were unknown. In this work the structure of iron verdoheme in complex with rat heme oxygenase was studied by density functional theory based B3LYP method and 6-31G basis set. The main goal is to obtain structural and energetic information for various transition states and intermediates on reaction pathways. The charge of verdoheme and iron as the central metal, electron distribution, spin multiplicity of the molecule and proximal substituents effect on the verdoheme ring stabilization and their arrangement are discussed. Gas phase computation has shown that the central metal of the five coordinated rat-verdohemeas ferrous (Fe[Formula: see text] (from 1a-1i) and ferric (Fe[Formula: see text] (from 1j–1q). The Mulliken and NBO charge and spin calculation show that iron is considered as ferrous in all of the optimized structures. Assessment results can gain valuable chemical insight into the electronic reorganization during the reactions.
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Affiliation(s)
- Hamideh Tasharofi
- Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran, Postal code: 1467686831, Iran
| | - Parisa Rajabali Jamaat
- Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, Iran, Postal code: 1866113118, Iran
| | - Maryam Daghighi Asli
- Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran, Postal code: 1467686831, Iran
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Summers TJ, Cheng Q, Palma MA, Pham DT, Kelso DK, Webster CE, DeYonker NJ. Cheminformatic quantum mechanical enzyme model design: A catechol-O-methyltransferase case study. Biophys J 2021; 120:3577-3587. [PMID: 34358526 DOI: 10.1016/j.bpj.2021.07.029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/26/2021] [Accepted: 07/29/2021] [Indexed: 10/20/2022] Open
Abstract
To accurately simulate the inner workings of an enzyme active site with quantum mechanics (QM), not only must the reactive species be included in the model but also important surrounding residues, solvent, or coenzymes involved in crafting the microenvironment. Our lab has been developing the Residue Interaction Network Residue Selector (RINRUS) toolkit to utilize interatomic contact network information for automated, rational residue selection and QM-cluster model generation. Starting from an x-ray crystal structure of catechol-O-methyltransferase, RINRUS was used to construct a series of QM-cluster models. The reactant, product, and transition state of the methyl transfer reaction were computed for a total of 550 models, and the resulting free energies of activation and reaction were used to evaluate model convergence. RINRUS-designed models with only 200-300 atoms are shown to converge. RINRUS will serve as a cornerstone for improved and automated cheminformatics-based enzyme model design.
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Affiliation(s)
- Thomas J Summers
- Department of Chemistry, The University of Memphis, Memphis, Tennessee
| | - Qianyi Cheng
- Department of Chemistry, The University of Memphis, Memphis, Tennessee
| | - Manuel A Palma
- Department of Chemistry, The University of Memphis, Memphis, Tennessee
| | - Diem-Trang Pham
- Department of Chemistry, The University of Memphis, Memphis, Tennessee; Department of Computer Science, The University of Memphis, Memphis, Tennessee
| | - Dudley K Kelso
- Department of Chemistry, The University of Memphis, Memphis, Tennessee
| | - Charles Edwin Webster
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi
| | - Nathan J DeYonker
- Department of Chemistry, The University of Memphis, Memphis, Tennessee.
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Hydrogen Sulfide: Novel Endogenous and Exogenous Modulator of Oxidative Stress in Retinal Degeneration Diseases. Molecules 2021; 26:molecules26092411. [PMID: 33919146 PMCID: PMC8122398 DOI: 10.3390/molecules26092411] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 04/14/2021] [Accepted: 04/19/2021] [Indexed: 11/29/2022] Open
Abstract
Oxidative stress (OS) damage can cause significant injury to cells, which is related to the occurrence and development of many diseases. This pathological process is considered to be the first step to trigger the death of outer retinal neurons, which is related to the pathology of retinal degenerative diseases. Hydrogen sulfide (H2S) has recently received widespread attention as a physiological signal molecule and gas neuromodulator and plays an important role in regulating OS in eyes. In this article, we reviewed the OS responses and regulatory mechanisms of H2S and its donors as endogenous and exogenous regulators in retinal degenerative diseases. Understanding the relevant mechanisms will help to identify the therapeutic potential of H2S in retinal degenerative diseases.
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Feng S, Yue Y, Chen J, Zhou J, Li Y, Zhang Q. Biodegradation mechanism of polycaprolactone by a novel esterase MGS0156: a QM/MM approach. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2020; 22:2332-2344. [PMID: 33146659 DOI: 10.1039/d0em00340a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nowadays micro-plastic pollution has become one of the most serious global environmental problems. A potential strategy in managing micro-plastic waste is enzyme-catalyzed degradation. MGS0156 is a hydrolase screened from environmental metagenomes, which can efficiently degrade commercial plastics such as polycaprolactone, polylactide, etc. Here a combined molecular dynamics, molecular mechanics Poisson-Boltzmann surface area, and quantum mechanics/molecular mechanism method was used to reveal the enzymatic depolymerization mechanism. By systematically analyzing the binding processes of nine oligomers (from a monomer to tetramer), we found that longer oligomers have relatively stronger binding energy. The degradation process involves two concerted elementary steps: triad-assisted nucleophilic attack and C-O bond cleavage. C-O bond cleavage is the rate determining step with an average barrier of 15.7 kcal mol-1, which is consistent with the experimentally determined kcat (1101 s-1, corresponds to 13.3 kcal mol-1). The electrostatic influence analysis of twenty amino acids highlights His231 and Asp237 as potential mutation targets for designing more efficient MGS0156 mutants.
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Affiliation(s)
- Shanshan Feng
- Environment Research Institute, Shandong University, Qingdao, 266200, P. R. China.
| | - Yue Yue
- Environment Research Institute, Shandong University, Qingdao, 266200, P. R. China.
| | - Jinfeng Chen
- Environment Research Institute, Shandong University, Qingdao, 266200, P. R. China.
| | - Jie Zhou
- Environment Research Institute, Shandong University, Qingdao, 266200, P. R. China.
| | - Yanwei Li
- Environment Research Institute, Shandong University, Qingdao, 266200, P. R. China.
| | - Qingzhu Zhang
- Environment Research Institute, Shandong University, Qingdao, 266200, P. R. China.
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Sarabi S, Jamaat PR, Djahaniani H. Theoretical kinetics and thermodynamics study: Peripheral substituent effects on the hydrolysis of verdoheme. J PORPHYR PHTHALOCYA 2020. [DOI: 10.1142/s1088424620500418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The heme oxygenase (HO) enzyme is a free heme protein that binds to heme in the body. Heme acts as both a cofactor and a substrate in this enzyme. The catabolism of heme into biliverdin, monoxide carbon, and free-iron, catalyzed by heme oxygenase via three consecutive oxygenation steps, in which the heme group functions as the prosthetic group as well as the substrate. Investigations of the reactions of the peripheral substituent on the heme ring with 5-oxaporphyrin iron complexes (verdohemes) have been assumed to provide models and largely unknown for the primary step in the hydrolysis of verdohemes. In this work, a theoretical kinetics and thermodynamics study of the degradation reactions of verdohemes was performed, and calculations show that the [Formula: see text] in the hydrolysis of verdohemes with non-peripheral substituents is more negative than hydrolysis of verdohemes with peripheral substituents. In other words, the hydrolysis of verdohemes with non-peripheral substituents is more energy-efficient than verdohemes with a peripheral substituents. Equilibrium constant calculations show that hydrolysis of verdohemes with non-peripheral substituents is much faster than that of verdohemes with peripheral substituents, which is due to a more convenient nucleophilic attack on the cationic ring than the anionic ring. To acquire a good molecular understanding, peripheral substituent effects on the hydrolysis of verdoheme’s inhibitory role was studied using the DFT method.
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Affiliation(s)
- Shahriyar Sarabi
- Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, Iran
| | | | - Hoorieh Djahaniani
- Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, Iran
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Liu H, Perumal N, Manicam C, Mercieca K, Prokosch V. Proteomics Reveals the Potential Protective Mechanism of Hydrogen Sulfide on Retinal Ganglion Cells in an Ischemia/Reperfusion Injury Animal Model. Pharmaceuticals (Basel) 2020; 13:ph13090213. [PMID: 32867129 PMCID: PMC7557839 DOI: 10.3390/ph13090213] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 08/24/2020] [Accepted: 08/25/2020] [Indexed: 12/13/2022] Open
Abstract
Glaucoma is the leading cause of irreversible blindness and is characterized by progressive retinal ganglion cell (RGC) degeneration. Hydrogen sulfide (H2S) is a potent neurotransmitter and has been proven to protect RGCs against glaucomatous injury in vitro and in vivo. This study is to provide an overall insight of H2S’s role in glaucoma pathophysiology. Ischemia-reperfusion injury (I/R) was induced in Sprague-Dawley rats (n = 12) by elevating intraocular pressure to 55 mmHg for 60 min. Six of the animals received intravitreal injection of H2S precursor prior to the procedure and the retina was harvested 24 h later. Contralateral eyes were assigned as control. RGCs were quantified and compared within the groups. Retinal proteins were analyzed via label-free mass spectrometry based quantitative proteomics approach. The pathways of the differentially expressed proteins were identified by ingenuity pathway analysis (IPA). H2S significantly improved RGC survival against I/R in vivo (p < 0.001). In total 1115 proteins were identified, 18 key proteins were significantly differentially expressed due to I/R and restored by H2S. Another 11 proteins were differentially expressed following H2S. IPA revealed a significant H2S-mediated activation of pathways related to mitochondrial function, iron homeostasis and vasodilation. This study provides first evidence of the complex role that H2S plays in protecting RGC against I/R.
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Affiliation(s)
- Hanhan Liu
- Experimental and Translational Ophthalmology, University Medical Centre of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (H.L.); (N.P.); (C.M.)
| | - Natarajan Perumal
- Experimental and Translational Ophthalmology, University Medical Centre of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (H.L.); (N.P.); (C.M.)
| | - Caroline Manicam
- Experimental and Translational Ophthalmology, University Medical Centre of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany; (H.L.); (N.P.); (C.M.)
| | - Karl Mercieca
- Royal Eye Hospital, School of Medicine, University of Manchester, Manchester M13 9WH, UK;
| | - Verena Prokosch
- Department of Ophthalmology, University Medical Centre of the Johannes Gutenberg University Mainz, 55131 Mainz, Germany
- Correspondence: ; Tel.: +49-1703862250
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Yuan C, Zhang Y, Tan H, Li X, Chen G, Jia Z. ONIOM investigations of the heme degradation mechanism by MhuD: the critical function of heme ruffling. Phys Chem Chem Phys 2020; 22:8817-8826. [DOI: 10.1039/c9cp05868k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A unique ruffling conformation of hydroxyheme in MhuD inhibits its “on-site” monooxygenation but induces “remote-site” dioxygenation.
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Affiliation(s)
- Chang Yuan
- College of Chemistry
- Key Laboratories of Theoretical and Computational Photochemistry
- Ministry of Education
- Beijing Normal University
- Beijing
| | - Ying Zhang
- College of Chemistry
- Key Laboratories of Theoretical and Computational Photochemistry
- Ministry of Education
- Beijing Normal University
- Beijing
| | - Hongwei Tan
- College of Chemistry
- Key Laboratories of Theoretical and Computational Photochemistry
- Ministry of Education
- Beijing Normal University
- Beijing
| | - Xichen Li
- College of Chemistry
- Key Laboratories of Theoretical and Computational Photochemistry
- Ministry of Education
- Beijing Normal University
- Beijing
| | - Guangju Chen
- College of Chemistry
- Key Laboratories of Theoretical and Computational Photochemistry
- Ministry of Education
- Beijing Normal University
- Beijing
| | - Zongchao Jia
- Department of Biomedical and Molecular Sciences
- Queen's University
- Kingston
- Ontario
- Canada
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