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Pramanik U, Khamari L, Rai S, Mahato P, Nandy A, Yadav R, Agrawal S, Mukherjee S. Macrocyclic Cavitand β-Cyclodextrin Inhibits the Alcohol-induced Trypsin Aggregation. Chemphyschem 2022; 23:e202200155. [PMID: 35608331 DOI: 10.1002/cphc.202200155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 05/24/2022] [Indexed: 11/09/2022]
Abstract
Trypsin, the most abundant pancreatic protein, aids in protein digestion by hydrolysis and exhibits aggregation propensity in presence of alcohol which can further lead to pancreatitis and eventually pancreatic cancer. Herein, by several experimental and theoretical approaches, we unearth the inhibition of alcohol-induced aggregation of Trypsin by macrocyclic cavitand, β-cyclodextrin (β-CD). β-CD interacts with the native protein and shows inhibitory effect in a dose dependent manner. Moreover, the secondary structures and morphologies of Trypsin in presence of β-CD also clearly emphasize the inhibition of fibril formation. From Fluorescence Correlation Spectroscopy, we observed an enhancement in diffusion time of Nile Red with ~ 2.5 times increase in hydrodynamic radius, substantiating the presence of fibrillar structure. Trypsin also shows reduction in its functional activity due to alcohol-induced aggregation. Our simulation data reports the probable residues responsible for fibril formation which was validated by molecular docking studies.
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Affiliation(s)
- Ushasi Pramanik
- IISER Bopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Laxmikanta Khamari
- IISER Bhopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Saurabh Rai
- IISER Bhopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Paritosh Mahato
- IISER Bopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Atanu Nandy
- IISER Bhopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Rahul Yadav
- IISER Bhopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Sameeksha Agrawal
- IISER Bopal: Indian Institute of Science Education and Research Bhopal, Chemistry, INDIA
| | - Saptarshi Mukherjee
- Indian Institute of Science Education and Research Bhopal, Chemistry, Indore By-Pass Road, Bhauri, 462066, Bhopal, INDIA
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2
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Fan X, Gu C, Cai J, Bian Y, Yang X, Sun C, Jiang X. Study on active response of superoxide dismutase and relevant binding interaction with bioaccumulated phthalates and key metabolites in Eisenia fetida. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 223:112559. [PMID: 34333384 DOI: 10.1016/j.ecoenv.2021.112559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 07/15/2021] [Accepted: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Phthalic acid esters (PAEs) are a group of widespread persistent organic pollutants in the environment. Though the harmful effect of PAEs including activity inhibition of superoxide dismutase (SOD) to arouse oxidative stress were well documented, the deep insights into mechanisms that are relevant with SOD activity are still lacking. By 7d-cultivation of Eisenia fetida in artificially-polluted soil, the different active responses of SOD in earthworm were shown to PAE congeners. Despite the less bioaccumulation and bioavailability, the di-butyl phthalate (DBP) etc. structurally coupled with longer ester-chains appeared more effective to trigger the up-regulation and then the slight decline of SOD activity. Given the remarkable biotransformation especially for short-chain PAEs, the SOD activity response in earthworm should be regarded as joint effect with their metabolites, e.g. monophthalates (MAEs) and phthalic acid (PA). The in vitro SOD activity was shown with the obvious inhibition of 21.31% by DBP, 88.93% by MBP, and 58.57% by PA respectively when the concentrations were elevated up to 0.03 mM. The SOD activity inhibition confirmed the molecular binding with pollutants as an essential event besides the biological regulation for activity. The binding interaction was thermodynamically exothermic, spontaneous and strengthened primarily by Van der Waals force and hydrogen bonds, and was spectrally diagnosed with the conformational changes including diminution of α-helix content and spatial reorientation of fluorophore tryptophan. As coherently illustrated with the larger fluorescence quenching constants (3.65*104-4.47*104/mol) than DBP, the metabolites should be the priority concern due to stronger activity inhibition and toxicological risks.
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Affiliation(s)
- Xiuli Fan
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
| | - Chenggang Gu
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Jun Cai
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yongrong Bian
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
| | - Xinglun Yang
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
| | - Cheng Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, PR China
| | - Xin Jiang
- CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China
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3
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Comparing the interaction of four structurally similar coumarins from Fraxinus Chinensis Roxb. with HSA through multi-spectroscopic and docking studies. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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4
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Najar MH, Chat OA, Bhat PA, Mir MA, Rather GM, Dar AA. Structural changes in trypsin induced by the bile salts: An effect of amphiphile hydrophobicity. Int J Biol Macromol 2021; 180:121-128. [PMID: 33713773 DOI: 10.1016/j.ijbiomac.2021.03.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/06/2021] [Accepted: 03/09/2021] [Indexed: 01/22/2023]
Abstract
The present study reports the multi-technique results of the interaction of a series of bile salts, sodium cholate (NaC), sodium taurocholate (NaTC), sodium deoxycholate (NaDC), and sodium taurodeoxycholate (NaTDC) with trypsin under the experimental conditions of 25 °C and pH 7.0. The interactions between trypsin and the bile salts were characterized by the surface tension measurements and various spectroscopic techniques like UV-Visible absorption, steady-state fluorescence, and circular dichroism. The results of surface tension measurements reveal a strong interaction of trypsin (50 μM) with the increasing concentration of bile salts, being higher with the bile salt of greater hydrophobicity. The critical aggregation concentration of bile salts in the presence of trypsin (C1) showed that the bile salts interact strongly with the trypsin in the order of NaTDC > NaDC > NaTC > NaC. UV-visible, steady-state fluorescence, and circular dichroism spectroscopic results confirmed significant unfolding of trypsin due to its interaction with the bile salts, the extent of which followed the same sequence as observed in the surface tension results. It could be concluded that the hydrophobic bile salts that show lower C1 values and have less delocalized charge, are more effective in unfolding the trypsin. The study would help understand the hydrophobicity-driven unfolding of proteins aided by biological surfactants like bile salts and help devise efficient proteolytic enzyme-based detergent formulations and understand the role of such amphiphiles as antimicrobial agents.
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Affiliation(s)
| | - Oyais Ahmad Chat
- Department of Chemistry, Government Degree College Kupwara, J&K 193222, India.
| | - Parvaiz Ahmad Bhat
- Department of Chemistry, Government Degree College Pulwama, J&K 192301, India
| | - Mohammad Amin Mir
- Department of Chemistry, Government Degree College Pulwama, J&K 192301, India
| | - Ghulam Mohamamd Rather
- Soft Matter Research Group, Department of Chemistry, University of Kashmir, Srinagar, J&K 190006, India
| | - Aijaz Ahmad Dar
- Soft Matter Research Group, Department of Chemistry, University of Kashmir, Srinagar, J&K 190006, India.
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5
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Self-association process of tetracycline antibiotic in different aqueous solutions: a joint experimental study and molecular dynamics simulation. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2020. [DOI: 10.1007/s13738-020-01977-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Alberca LN, Chuguransky SR, Álvarez CL, Talevi A, Salas-Sarduy E. In silico Guided Drug Repurposing: Discovery of New Competitive and Non-competitive Inhibitors of Falcipain-2. Front Chem 2019; 7:534. [PMID: 31448257 PMCID: PMC6691349 DOI: 10.3389/fchem.2019.00534] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 07/12/2019] [Indexed: 11/13/2022] Open
Abstract
Malaria is among the leading causes of death worldwide. The emergence of Plasmodium falciparum resistant strains with reduced sensitivity to the first line combination therapy and suboptimal responses to insecticides used for Anopheles vector management have led to renewed interest in novel therapeutic options. Here, we report the development and validation of an ensemble of ligand-based computational models capable of identifying falcipain-2 inhibitors, and their subsequent application in the virtual screening of DrugBank and Sweetlead libraries. Among four hits submitted to enzymatic assays, two (odanacatib, an abandoned investigational treatment for osteoporosis and bone metastasis, and the antibiotic methacycline) confirmed inhibitory effects on falcipain-2, with Ki of 98.2 nM and 84.4 μM. Interestingly, Methacycline proved to be a non-competitive inhibitor (α = 1.42) of falcipain-2. The effects of both hits on falcipain-2 hemoglobinase activity and on the development of P. falciparum were also studied.
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Affiliation(s)
- Lucas N Alberca
- Laboratory of Bioactive Compounds Research and Development (LIDeB), Department of Biological Sciences, Exact Sciences College, Universidad Nacional de La Plata, La Plata, Argentina
| | - Sara R Chuguransky
- Laboratory of Bioactive Compounds Research and Development (LIDeB), Department of Biological Sciences, Exact Sciences College, Universidad Nacional de La Plata, La Plata, Argentina
| | - Cora L Álvarez
- Departamento de Biodiversidad y Biología Experimental, Facultad de Farmacia y Bioquímica, Facultad de Ciencias Exactas y Naturales, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Química y Fisico-Química Biológicas (IQUIFIB) "Prof. Alejandro C. Paladini", Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Alan Talevi
- Laboratory of Bioactive Compounds Research and Development (LIDeB), Department of Biological Sciences, Exact Sciences College, Universidad Nacional de La Plata, La Plata, Argentina
| | - Emir Salas-Sarduy
- Instituto de Investigaciones Biotecnológicas "Dr. Rodolfo Ugalde", Universidad Nacional de San Martín, CONICET, Buenos Aires, Argentina
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7
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Trampari S, Papagiannopoulos A, Pispas S. Temperature-induced aggregation behavior in bovine pancreas trypsin solutions. Biochem Biophys Res Commun 2019; 515:282-288. [PMID: 31151824 DOI: 10.1016/j.bbrc.2019.05.124] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 05/19/2019] [Indexed: 02/07/2023]
Abstract
In this study, we investigate the effect of temperature treatment on Bovine Pancreas Trypsin (BPT) in aqueous solutions using dynamic, static and electrophoretic light scattering, fluorescence spectroscopy and circular dichroism. Static and dynamic light scattering at various solution conditions i.e. different salt content and pH, reveals that BPT aggregation is enhanced as temperature increases in a non-reversible manner. At acidic pH protein monomers are the dominant population over aggregates of globules, nevertheless the two populations co-exist at neutral and basic pH. The surface charge of the aggregates is intensified by aggregation and it is dominated by the negative residues of the protein at all pH conditions. Protein unfolding upon thermal treatment is probed by variation of the fluorescence spectrum which is caused by the exposure of tryptophan to the aqueous environment. The exposure of the hydrophobic interior of BPT upon heating may be considered as the reason of aggregation at the molecular level. Τhis study provides information that can be useful for utilizing thermal treatment protocols of BPT towards manufacturing protein-based nano formulated drugs.
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Affiliation(s)
- Sofia Trampari
- School of Applied Mathematical and Physical Sciences Physics Department, NTUA Zografou Campus, GR, 15780, Greece; Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635, Athens, Greece
| | - Aristeidis Papagiannopoulos
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635, Athens, Greece.
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635, Athens, Greece
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8
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Yang H, Zhang L, Hou G, Liu C. Insights into the effect and interaction mechanism of bisphenol S on lipids hydrolysis in sludge through multi-spectra, thermodynamics, and molecule docking analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:7834-7843. [PMID: 29297162 DOI: 10.1007/s11356-017-1107-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 12/19/2017] [Indexed: 06/07/2023]
Abstract
As an alternative to bisphenol A, bisphenol S (BPS) is widely used in industrial production and daily life, which is then discharged into sewage treatment plants and accumulates in sludge. In this research, impact and interaction mechanism of BPS on lipids hydrolysis in sludge is studied from the respect of soluble organic matter and volatile organic fatty acids (VFAs). Multi-spectra, thermodynamics, molecule docking, and enzyme activity assay are applied to elucidate the effect mechanism of BPS on lipids hydrolysis. Results show that lipids hydrolysis is restrained due to the denaturation of lipase with BPS exposure. The interaction mechanism is involved in hydrophobic bond and hydrogen bond interaction in the activity region of lipase. This interaction not only results in an unfolding skeleton structure of lipase and a less hydrophobic microenvironment of tyrosine and tryptophan residues but also leads to fluorophore static quenching with the formation of lipase-BPS complex. The experimental results and the combined research methods not only contribute to the development of novel technique for sludge treatment containing micropollutant but also profit to clarify the interaction mechanism between other micropollutant and enzymes.
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Affiliation(s)
- Hang Yang
- School of Environmental Science and Engineering, Shandong University, Jinan, Shandong Province, 250100, China
| | - Li Zhang
- School of Environmental Science and Engineering, Shandong University, Jinan, Shandong Province, 250100, China
| | - Guangying Hou
- School of Environmental Science and Engineering, Shandong University, Jinan, Shandong Province, 250100, China
| | - Chunguang Liu
- School of Environmental Science and Engineering, Shandong University, Jinan, Shandong Province, 250100, China.
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9
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Chi Z, Zhao J, Li W, Araghi A, Tan S. In vitro assessment of phthalate acid esters-trypsin complex formation. CHEMOSPHERE 2017; 185:29-35. [PMID: 28683334 DOI: 10.1016/j.chemosphere.2017.07.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 06/08/2017] [Accepted: 07/01/2017] [Indexed: 06/07/2023]
Abstract
In this work, interactions of three phthalate acid esters (PAEs), including dimethyl phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP), with trypsin have been studied in vitro, under simulated physiological conditions using multi-spectroscopic techniques and molecular modeling. The results show that these PAEs can bind to the trypsin, forming trypsin-PAEs complexes, mainly via hydrophobic interactions, with the affinity order of DMP > DEP > DBP. Binding to the PAEs is found to result in molecular deformation of trypsin. The modeling results suggest that only DBP can bind with the amino acid residues of the catalytic triad and S1 binding pocket of trypsin, leading to potential competitive enzyme inhibition.
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Affiliation(s)
- Zhenxing Chi
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai, 264209, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China; Guangzhou Key Laboratory of Environmental Exposure and Health, School of Environment, Jinan University, Guangzhou 510632, PR China.
| | - Jing Zhao
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai, 264209, PR China
| | - Weiguo Li
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai, 264209, PR China
| | - Arash Araghi
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney 2006, Australia
| | - Songwen Tan
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai, 264209, PR China
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10
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Chanphai P, Agudelo D, Tajmir-Riahi HA. PEG and mPEG-anthracene conjugate with trypsin and trypsin inhibitor: hydrophobic and hydrophilic contacts. J Biomol Struct Dyn 2017; 35:2257-2268. [PMID: 27434220 DOI: 10.1080/07391102.2016.1214621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 07/14/2016] [Indexed: 12/23/2022]
Abstract
The conjugation of trypsin (try) and trypsin inhibitor (tryi) with poly(ethylene glycol) (PEG) and methoxypoly(ethylene glycol) anthracene (mPEG-anthracene) was investigated in aqueous solution, using multiple spectroscopic methods, thermodynamic analysis, and molecular modeling. Thermodynamic parameters ΔS, ΔH, and ΔG showed protein-PEG bindings occur via H-bonding and van der Waals contacts with trypsin inhibitor forming more stable conjugate than trypsin. As polymer size increased more stable PEG-protein conjugate formed, while hydrophobic mPEG-anthracene forms less stable protein complexes. Modeling showed the presence of several H-bonding contacts between polymer and amino acids that stabilize protein-polymer conjugation. Polymer complexation induces more perturbations of trypsin inhibitor structure than trypsin with reduction of protein alpha-helix and major increase in random structures, indicating protein structural destabilization.
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Affiliation(s)
- P Chanphai
- a Department of Chemistry-Biochemistry and Physics , University of Québec at Trois-Rivières , C. P. 500, Trois-Rivieres G9A 5H7 , Quebec , Canada
| | - D Agudelo
- a Department of Chemistry-Biochemistry and Physics , University of Québec at Trois-Rivières , C. P. 500, Trois-Rivieres G9A 5H7 , Quebec , Canada
| | - H A Tajmir-Riahi
- a Department of Chemistry-Biochemistry and Physics , University of Québec at Trois-Rivières , C. P. 500, Trois-Rivieres G9A 5H7 , Quebec , Canada
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11
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Chanphai P, Kreplak L, Tajmir-Riahi HA. Aggregation of trypsin and trypsin inhibitor by Al cation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 169:7-12. [PMID: 28246055 DOI: 10.1016/j.jphotobiol.2017.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 02/16/2017] [Accepted: 02/21/2017] [Indexed: 11/26/2022]
Abstract
Al cation may trigger protein structural changes such as aggregation and fibrillation, causing neurodegenerative diseases. We report the effect of Al cation on the solution structures of trypsin (try) and trypsin inhibitor (tryi), using thermodynamic analysis, UV-Visible, Fourier transform infrared (FTIR) spectroscopic methods and atomic force microscopy (AFM). Thermodynamic parameters showed Al-protein bindings occur via H-bonding and van der Waals contacts for trypsin and trypsin inhibitor. AFM showed that Al cations are able to force trypsin into larger or more robust aggregates than trypsin inhibitor, with trypsin 5±1 SE (n=52) proteins per aggregate and for trypsin inhibitor 8.3±0.7 SE (n=118). Thioflavin T test showed no major protein fibrillation in the presence of Al cation. Al complexation induced more alterations of trypsin inhibitor conformation than trypsin.
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Affiliation(s)
- P Chanphai
- Department of Chemistry-Biochemistry, Physics University of Québec, Trois-Rivières, C. P. 500, TR, Quebec G9A 5H7, Canada
| | - L Kreplak
- Department of Physics and Atmospheric Science, Sir James Dunn Building Dalhousie University, Lord Dalhousie Drive, Halifax NS B3H 4R2, Canada
| | - H A Tajmir-Riahi
- Department of Chemistry-Biochemistry, Physics University of Québec, Trois-Rivières, C. P. 500, TR, Quebec G9A 5H7, Canada.
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12
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Oanca G, Nadejde C, Fifere N, Todirascu AG, Creanga D, Dorohoi D, Stare J. Solvatochromic study on chlortetracycline in binary and ternary solutions. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.12.066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Song Q, Zhang X, Li N, Shen J, Cheng J. A propeptide-independent protease from Tannerella sp.6_1_58FAA_CT1 displays trypsin-like specificity. J Basic Microbiol 2016; 57:50-56. [PMID: 27714828 DOI: 10.1002/jobm.201600486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 09/18/2016] [Indexed: 11/06/2022]
Abstract
Despite the absence of any homologs of Tannerella forsythia KLIKK proteases in Tannerella sp.6_1_58FAA_CT1, the strain possesses a putative cysteine protease (G9S4N1) closely related to RgpB of Porphyromonas gingivalis. G9S4N1 lacks obvious propeptide that behaves as inhibitor of proteases and was proven to be a propeptide-independent protease. Unlike RgpB, which exclusively cleaves ArgXaa bonds, G9S4N1 exhibits both arginine- and citrulline-specific activities. Mutations of Asp177, a potential P1-Arg binding site, to uncharged or positively charged residues did not alter the substrate specificity of G9S4N1 significantly. Moreover, a group of arginine-specific proteases from different species including porcine trypsin, bovine thrombin, and a trypsin-like serine protease of dengue 2 virus CF40-Gly-NS3pro185 also display different specificity toward citrulline residue, suggesting that citrulline-modified protein might have different roles and destiny in biological processes involving various proteases.
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Affiliation(s)
- Qitao Song
- College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, P. R. China
| | - Xiaoyue Zhang
- College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, P. R. China
| | - Na Li
- College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, P. R. China
| | - Jie Shen
- College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, P. R. China
| | - Jiansong Cheng
- College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin, P. R. China
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14
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Chanphai P, Tajmir-Riahi H. Chitosan nanoparticles conjugate with trypsin and trypsin inhibitor. Carbohydr Polym 2016; 144:346-52. [DOI: 10.1016/j.carbpol.2016.02.066] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 02/15/2016] [Accepted: 02/22/2016] [Indexed: 01/23/2023]
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15
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Chanphai P, Thomas TJ, Tajmir-Riahi HA. Conjugation of biogenic and synthetic polyamines with trypsin and trypsin inhibitor. RSC Adv 2016. [DOI: 10.1039/c6ra09492a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Polyamine–protein conjugates can be used as delivery tools to transport antitumor polyamine analogues.
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Affiliation(s)
- P. Chanphai
- Department of Chemistry-Biochemistry and Physics
- University of Québec at Trois-Rivières
- Trois-Rivières
- Canada
| | - T. J. Thomas
- Department of Medicine
- Rutgers Robert Wood Johnson Medical School
- Rutgers Cancer Institute of New Jersey
- New Brunswick
- USA
| | - H. A. Tajmir-Riahi
- Department of Chemistry-Biochemistry and Physics
- University of Québec at Trois-Rivières
- Trois-Rivières
- Canada
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16
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Chanphai P, Tajmir-Riahi H. Trypsin and trypsin inhibitor bind PAMAM nanoparticles: Effect of hydrophobicity on protein–polymer conjugation. J Colloid Interface Sci 2016; 461:419-424. [DOI: 10.1016/j.jcis.2015.09.048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 09/20/2015] [Accepted: 09/21/2015] [Indexed: 12/20/2022]
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17
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Wang Y, Zhang G, Wang L. Potential toxicity of phthalic acid esters plasticizer: interaction of dimethyl phthalate with trypsin in vitro. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:75-84. [PMID: 25496445 DOI: 10.1021/jf5046359] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Dimethyl phthalate (DMP) is widely used as a plasticizer in industrial processes and has been reported to possess potential toxicity to the human body. In this study, the interaction between DMP and trypsin in vitro was investigated. The results of fluorescence, UV–vis, circular dichroism, and Fourier transform infrared spectra along with cyclic voltammetric measurements indicated that the remarkable fluorescence quenching and conformational changes of trypsin resulted from the formation of a DMP–trypsin complex, which was driven mainly by hydrophobic interactions. The molecular docking and trypsin activity assay showed that DMP primarily interacted with the catalytic triad of trypsin and led to the inhibition of trypsin activity. The dimensions of the individual trypsin molecules were found to become larger after binding with DMP by atomic force microscopy imaging. This study offers a comprehensive picture of DMP–trypsin interaction, which is expected to provide insights into the toxicological effect of DMP.
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18
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Teng Y, Zou L, Huang M, Chen Y. Molecular interaction mechanism between 2-mercaptobenzimidazole and copper-zinc superoxide dismutase. PLoS One 2014; 9:e106003. [PMID: 25157630 PMCID: PMC4144957 DOI: 10.1371/journal.pone.0106003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Accepted: 07/31/2014] [Indexed: 11/19/2022] Open
Abstract
2-Mercaptobenzimidazole (MBI) is widely utilized as a corrosion inhibitor, copper-plating brightener and rubber accelerator. The residue of MBI in the environment is potentially harmful. In the present work, the toxic interaction of MBI with the important antioxidant enzyme copper-zinc superoxide dismutase (Cu/ZnSOD) was investigated using spectroscopic and molecular docking methods. MBI can interact with Cu/ZnSOD to form an MBI-Cu/ZnSOD complex. The binding constant, number of binding sites and thermodynamic parameters were measured, which indicated that MBI could spontaneously bind with Cu/ZnSOD with one binding site through hydrogen bonds and van der Waals forces. MBI bound into the Cu/ZnSOD interface of two subdomains, which caused some microenvironmental and secondary structure changes of Cu/ZnSOD and further resulted in the inhibition of Cu/ZnSOD activity. This work provides direct evidence at a molecular level to show that exposure to MBI could induce changes in the structure and function of the enzyme Cu/ZnSOD. The estimated methods in this work may be applied to probe molecular interactions of biomacromolecules and other pollutants and drugs.
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Affiliation(s)
- Yue Teng
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province, PR China
- * E-mail:
| | - Luyi Zou
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province, PR China
| | - Ming Huang
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province, PR China
| | - Yadong Chen
- Laboratory of Molecular Design and Drug Discovery, School of Basic Science, China Pharmaceutical University, Nanjing, Jiangsu Province, PR China
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Mojica ERE, Nguyen E, Rozov M, Bright FV. pH-Dependent Spectroscopy of Tetracycline and Its Analogs. J Fluoresc 2014; 24:1183-98. [DOI: 10.1007/s10895-014-1399-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Accepted: 04/23/2014] [Indexed: 10/25/2022]
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