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Hypericum perforatum and Its Ingredients Hypericin and Pseudohypericin Demonstrate an Antiviral Activity against SARS-CoV-2. Pharmaceuticals (Basel) 2022; 15:ph15050530. [PMID: 35631357 PMCID: PMC9146521 DOI: 10.3390/ph15050530] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/15/2022] [Accepted: 04/17/2022] [Indexed: 12/11/2022] Open
Abstract
For almost two years, the COVID-19 pandemic has constituted a major challenge to human health, particularly due to the lack of efficient antivirals to be used against the virus during routine treatment interventions. Multiple treatment options have been investigated for their potential inhibitory effect on SARS-CoV-2. Natural products, such as plant extracts, may be a promising option, as they have shown an antiviral activity against other viruses in the past. Here, a quantified extract of Hypericum perforatum was tested and found to possess a potent antiviral activity against SARS-CoV-2. The antiviral potency of the extract could be attributed to the naphtodianthrones hypericin and pseudohypericin, in contrast to other tested ingredients of the plant material, which did not show any antiviral activity. Hypericum perforatum and its main active ingredient hypericin were also effective against different SARS-CoV-2 variants (Alpha, Beta, Delta, and Omicron). Concerning its mechanism of action, evidence was obtained that Hypericum perforatum and hypericin may hold a direct virus-blocking effect against SARS-CoV-2 virus particles. Taken together, the presented data clearly emphasize the promising antiviral activity of Hypericum perforatum and its active ingredients against SARS-CoV-2 infections.
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Gieroba B, Kalisz G, Sroka-Bartnicka A, Płazińska A, Płaziński W, Starek M, Dąbrowska M. Molecular Structure of Cefuroxime Axetil Complexes with α-, β-, γ-, and 2-Hydroxypropyl-β-Cyclodextrins: Molecular Simulations and Raman Spectroscopic and Imaging Studies. Int J Mol Sci 2021; 22:ijms22105238. [PMID: 34063471 PMCID: PMC8156438 DOI: 10.3390/ijms22105238] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 05/11/2021] [Accepted: 05/13/2021] [Indexed: 11/16/2022] Open
Abstract
The formation of cefuroxime axetil+cyclodextrin (CA+CD) complexes increases the aqueous solubility of CA, improves its physico-chemical properties, and facilitates a biomembrane-mediated drug delivery process. In CD-based tablet formulations, it is crucial to investigate the molecular details of complexes in final pharmaceutical preparation. In this study, Raman spectroscopy and mapping were applied for the detection and identification of chemical groups involved in α-, β-, γ-, and 2-hydroxypropyl-β-CD (2-HP- β-CD)+CA complexation process. The experimental studies have been complemented by molecular dynamics-based investigations, providing additional molecular details of CA+CD interactions. It has been demonstrated that CA forms the guest–host type inclusion complexes with all studied CDs; however, the nature of the interactions is slightly different. It seems that both α- and β-CD interact with furanyl and methoxy moieties of CA, γ-CD forms a more diverse pattern of interactions with CA, which are not observed in other CDs, whereas 2HP-β-CD binds CA with the contribution of hydrogen bonding. Apart from supporting this interpretation of the experimental data, molecular dynamics simulations allowed for ordering the CA+CD binding affinities. The obtained results proved that the molecular details of the host–guest complexation can be successfully predicted from the combination of Raman spectroscopy and molecular modeling.
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Affiliation(s)
- Barbara Gieroba
- Department of Biopharmacy, Medical University of Lublin, ul. Chodzki 4a, 20-093 Lublin, Poland; (G.K.); (A.S.-B.); (A.P.)
- Correspondence: (B.G.); (W.P.)
| | - Grzegorz Kalisz
- Department of Biopharmacy, Medical University of Lublin, ul. Chodzki 4a, 20-093 Lublin, Poland; (G.K.); (A.S.-B.); (A.P.)
| | - Anna Sroka-Bartnicka
- Department of Biopharmacy, Medical University of Lublin, ul. Chodzki 4a, 20-093 Lublin, Poland; (G.K.); (A.S.-B.); (A.P.)
- Department of Genetics and Microbiology, Institute of Microbiology and Biotechnology, Maria Curie-Skłodowska University, ul. Akademicka 19, 20-033 Lublin, Poland
| | - Anita Płazińska
- Department of Biopharmacy, Medical University of Lublin, ul. Chodzki 4a, 20-093 Lublin, Poland; (G.K.); (A.S.-B.); (A.P.)
| | - Wojciech Płaziński
- Jerzy Haber Institute of Catalysis and Surface Chemistry, ul. Niezapominajek 8, 30-239 Krakow, Poland
- Correspondence: (B.G.); (W.P.)
| | - Małgorzata Starek
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, ul. Medyczna 9, 30-688 Kraków, Poland; (M.S.); (M.D.)
| | - Monika Dąbrowska
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Jagiellonian University Medical College, ul. Medyczna 9, 30-688 Kraków, Poland; (M.S.); (M.D.)
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Importance of Hypericin-Bcl2 interactions for biological effects at subcellular levels. Photodiagnosis Photodyn Ther 2019; 28:38-52. [PMID: 31430575 DOI: 10.1016/j.pdpdt.2019.08.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/18/2019] [Accepted: 08/12/2019] [Indexed: 02/06/2023]
Abstract
Hypericin (Hyp) is a naturally occurring compound used as photosensitizer in photodynamic therapy and diagnosis. Recently, we have shown that Hyp presence alone, without illumination, resulted in substantial biological effects at several sub-cellular levels. Hyp induced changes in cellular ultrastructure, mitochondria function and metabolism, and distribution of Bcl2 proteins in malignant and non-malignant cells. The molecular mechanisms that underlie Hyp light-independent effects are still elusive. We have hypothesized that Bcl2-Hyp interactions might be one possible mechanism. We performed molecular docking studies to determine the Hyp-Bcl2 interaction profile. Based on the interaction profiles small Bcl2 peptide segments were selected for further study. We designed small peptides corresponding to Bcl2 BH3 and BH1 domains and tested the binding of Hyp and Bcl2 known inhibitor, ABT263, to the peptides in computer modeling and in vitro binding studies. We employed endogenous tryptophan and tyrosine in the BH3 and BH1 peptides, respectively, and their fluorescent properties to show interaction with Hyp and ABT263. Overall, our results indicate that Hyp can interact with Bcl2 protein at its BH3-BH1 hydrophobic groove, and this interaction may trigger changes in intracellular distribution of Bcl2 proteins. In addition, our computer modeling results suggest that Hyp also interacts with other anti-apoptotic members of Bcl2 family similar to the known BH3 mimetics. Our findings are novel and might contribute to understanding Hyp light-independent effects. In addition, they may substantiate the therapeutic use of Hyp as a BH3 mimetic molecule to enhance other cancer treatments.
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Serum albumins are efficient delivery systems for the photosensitizer hypericin in photosensitization-based treatments against Staphylococcus aureus. Food Control 2018. [DOI: 10.1016/j.foodcont.2018.07.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Staničová J, Verebová V, Beneš J. Interaction of a Potential Anticancer Agent Hypericin and its Model Compound Emodin with DNA and Bovine Serum Albumin. In Vivo 2018; 32:1063-1070. [PMID: 30150427 DOI: 10.21873/invivo.11347] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/05/2018] [Accepted: 06/11/2018] [Indexed: 11/10/2022]
Abstract
BACKGROUND/AIM We report the incorporation of prospective anticancer agent hypericin into DNA and bovine serum albumin (BSA), respectively, with emphasis on comparison of the differences in interaction mode between hypericin and its model compound emodin. MATERIALS AND METHODS Spectrophotometric methods were used for determination of the binding constants of the drug complex with biomacromolecules. Differential scanning calorimetry was applied for evaluation of drug-macromolecule complex thermal stability. RESULTS The strength of interaction expressed by binding constants was found to be 4.0×104 l/mol for hypericin-DNA and 8.1×104 l/mol for emodin-DNA complex. Both molecules stabilize bovine serum albumin macromolecule and bind into the hydrophobic cavity in IIA subunit but their localization within the molecule is different. CONCLUSION Anticancer agent hypericin and its derivative emodin interact with DNA with medium strength and are probably incorporated into the groove of DNA by hydrogen bonds. Bovine serum albumin can serve as a transport protein for hypericin since the binding force between both molecules is adequate.
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Affiliation(s)
- Jana Staničová
- Institute of Biophysics, University of Veterinary Medicine & Pharmacy, Košice, Slovakia .,Institute of Biophysics & Informatics, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Valéria Verebová
- Institute of Biophysics, University of Veterinary Medicine & Pharmacy, Košice, Slovakia
| | - Jiří Beneš
- Institute of Biophysics & Informatics, First Faculty of Medicine, Charles University, Prague, Czech Republic
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Thakur V, Siddhanta S, Narayana C, Shivaprasad SM. Size and distribution control of surface plasmon enhanced photoluminescence and SERS signal in Ag–GaN hybrid systems. RSC Adv 2015. [DOI: 10.1039/c5ra24906f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present experiment, two GaN nanowall network (NWN) samples with different porosity were grown on c-sapphire substrates using plasma assisted molecular beam epitaxy (PA-MBE).
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Affiliation(s)
- Varun Thakur
- Chemistry and Physics of Materials Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore – 560064
- India
| | - Soumik Siddhanta
- Department of Mechanical Engineering
- John Hopkins University
- Baltimore
- USA
| | - C. Narayana
- Chemistry and Physics of Materials Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore – 560064
- India
| | - S. M. Shivaprasad
- Chemistry and Physics of Materials Unit
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Bangalore – 560064
- India
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An overview of translational (radio)pharmaceutical research related to certain oncological and non-oncological applications. World J Methodol 2013; 3:45-64. [PMID: 25237623 PMCID: PMC4145570 DOI: 10.5662/wjm.v3.i4.45] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 10/03/2013] [Accepted: 10/18/2013] [Indexed: 02/06/2023] Open
Abstract
Translational medicine pursues the conversion of scientific discovery into human health improvement. It aims to establish strategies for diagnosis and treatment of diseases. Cancer treatment is difficult. Radio-pharmaceutical research has played an important role in multiple disciplines, particularly in translational oncology. Based on the natural phenomenon of necrosis avidity, OncoCiDia has emerged as a novel generic approach for treating solid malignancies. Under this systemic dual targeting strategy, a vascular disrupting agent first selectively causes massive tumor necrosis that is followed by iodine-131 labeled-hypericin (123I-Hyp), a necrosis-avid compound that kills the residual cancer cells by crossfire effect of beta radiation. In this review, by emphasizing the potential clinical applicability of OncoCiDia, we summarize our research activities including optimization of radioiodinated hypericin Hyp preparations and recent studies on the biodistribution, dosimetry, pharmacokinetic and, chemical and radiochemical toxicities of the preparations. Myocardial infarction is a global health problem. Although cardiac scintigraphy using radioactive perfusion tracers is used in the assessment of myocardial viability, searching for diagnostic imaging agents with authentic necrosis avidity is pursued. Therefore, a comparative study on the biological profiles of the necrosis avid 123I-Hyp and the commercially available 99mTc-Sestamibi was conducted and the results are demonstrated. Cholelithiasis or gallstone disease may cause gallbladder inflammation, infection and other severe complications. While studying the mechanisms underlying the necrosis avidity of Hyp and derivatives, their naturally occurring fluorophore property was exploited for targeting cholesterol as a main component of gallstones. The usefulness of Hyp as an optical imaging agent for cholelithiasis was studied and the results are presented. Multiple uses of automatic contrast injectors may reduce costs and save resources. However, cross-contaminations with blood-borne pathogens of infectious diseases may occur. We developed a radioactive method for safety evaluation of a new replaceable patient-delivery system. By mimicking pathogens with a radiotracer, we assessed the feasibility of using the system repeatedly without septic risks. This overview is deemed to be interesting to those involved in the related fields for translational research.
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Zhang W, Xiong X, Wang F, Ge Y, Liu Y. Studies of the Interaction Between Ronidazole and Human Serum Albumin by Spectroscopic and Molecular Docking Methods. J SOLUTION CHEM 2013. [DOI: 10.1007/s10953-013-0027-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chandra GK, Tripathy DR, Dasgupta S, Roy A. Interaction of (-)-epigallocatechin gallate with lysozyme-conjugated silver nanoparticles. APPLIED SPECTROSCOPY 2012; 66:744-749. [PMID: 22710368 DOI: 10.1366/11.06533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The interaction of lysozyme (Lyz)-conjugated silver (Ag) nanoparticles with (-)-epigallocatechin gallate (EGCG), one of the major components of green tea, has been investigated. Interaction of a protein with ligand/drug molecules perturbs the conformation of secondary and tertiary structures of the protein. We have demonstrated the conformational changes in the tertiary structures of the Lyz molecules on EGCG binding using surface-enhanced Raman scattering (SERS) and circular dichroism (CD) spectroscopic measurements. From the analysis of the amide I band of Lyz in SERS and CD spectra, the site of interaction of EGCG with protein molecules in Lyz-conjugated Ag particles has been identified. Spectroscopic evidence for the conformational response of Trp62 and Trp63, in the β-domain of the protein, to the binding of EGCG has been discussed.
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Monti S, Manet I, Marconi G. Combination of spectroscopic and computational methods to get an understanding of supramolecular chemistry of drugs: from simple host systems to biomolecules. Phys Chem Chem Phys 2011; 13:20893-905. [DOI: 10.1039/c1cp21992h] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Roelants M, Van Cleynenbreugel B, Van Poppel H, Lerut E, de Witte PAM. Use of fluorescein isothiocyanate-human serum albumin for the intravesical photodiagnosis of non-muscle-invasive bladder cancer: an in vitro study using multicellular spheroids composed of normal human urothelial and urothelial cell carcinoma cell lines. BJU Int 2010; 108:455-9. [PMID: 21156021 DOI: 10.1111/j.1464-410x.2010.09951.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE • To evaluate human serum albumin (HSA), fluorescently labelled with fluorescein isothiocyanate (FITC), as a potential intravesical photodiagnostic method for the early detection of non-muscle-invasive bladder cancer. PATIENTS AND METHODS • By using multicellular spheroids prepared from normal human urothelial (NHU) cells and from different urothelial cell carcinoma (UCC) cell lines (T24, J82), we simulated three-dimensionally the normal urothelium and non-muscle-invasive UCCs present in the bladder of patients. • The distribution of FITC-HSA in these spheroids was investigated. RESULTS • Our data showed that fluorescently labelled albumin is quite evenly dispersed throughout the spheroids. However, in the case of the 10 mg/mL incubations, the fluorescence intensity seems to increase slightly towards the spheroid core. • Using 1 mg/mL, the penetration of FITC-HSA in T24 differed significantly from the penetration in NHU spheroids, but this was not the case for J82 spheroids. • When the concentration of FITC-HSA was increased 10-fold, all UCC spheroids exhibited a significantly different accumulation of FITC-HSA. CONCLUSIONS • As spheroids represent a suitable in vitro model for predicting the in vivo behaviour of compounds, our data suggest that FITC-HSA could be used for the early detection of non-muscle-invasive bladder cancer. • Human serum albumin conjugates of new or already available intravesical drugs could be generated to create alternative bladder cancer therapies with increased selectivity.
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Affiliation(s)
- Mieke Roelants
- Pharmaceutical Biology Laboratory, Catholic University of Leuven, Leuven, Belgium
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12
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Roelants M, Van Cleynenbreugel B, Lerut E, Van Poppel H, de Witte PAM. Human serum albumin as key mediator of the differential accumulation of hypericin in normal urothelial cell spheroids versus urothelial cell carcinoma spheroids. Photochem Photobiol Sci 2010; 10:151-9. [PMID: 21103512 DOI: 10.1039/c0pp00109k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hypericin is a bright red fluorescent compound that can be used in urological medicine as a photodiagnostic to detect non-muscle-invasive bladder cancer lesions. To this end a bladder instillation fluid is prepared in which the water-insoluble hypericin is solubilized by the presence of human serum albumin (HSA) to which the compound binds. In the present study, we explored the possibility that besides acting as a passive hypericin carrier, HSA also actively contributes to the selective localization of the compound. By using multicellular spheroids prepared from normal human urothelial (NHU) cells and from different urothelial carcinoma cell (UCC) lines (T24, RT-112 and RT-4), we simulated three-dimensionally the normal urothelium and urothelial cell carcinomas present in the bladder of patients. The distribution of hypericin in these spheroids was investigated in the presence or absence of HSA. Our data show that when hypericin is solubilized by HSA, an excellent differentiation in distribution of hypericin in normal urothelial spheroids and malignant spheroids is observed, clearly suggesting a key role for albumin in the specific localization of hypericin in non-muscle-invasive bladder tumours. Furthermore, PDT results show that both the hypericin-PDT effect on tumour spheroids and the selective character of the treatment can significantly be increased by the presence of HSA. Interestingly, we also observed that the presence of HSA did not convey tumouritropic characteristics to other photosensitizers like pheophorbide a and mTHPP, implying that both the particular characteristics of the photosensitizer and HSA contribute to the final selective accumulation of the compound in tumoural tissue.
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Affiliation(s)
- Mieke Roelants
- Laboratorium voor Farmaceutische Biologie, Katholieke Universiteit Leuven, Herestraat 49, B-3000, Leuven, Belgium
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Ye H, Qiu B, Lin Z, Chen G. Fluorescence spectrometric study on the interaction of tamibarotene with bovine serum albumin. LUMINESCENCE 2010; 26:336-41. [DOI: 10.1002/bio.1234] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 05/30/2010] [Accepted: 06/21/2010] [Indexed: 11/09/2022]
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Huntosova V, Alvarez L, Bryndzova L, Nadova Z, Jancura D, Buriankova L, Bonneau S, Brault D, Miskovsky P, Sureau F. Interaction dynamics of hypericin with low-density lipoproteins and U87-MG cells. Int J Pharm 2010; 389:32-40. [DOI: 10.1016/j.ijpharm.2010.01.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2009] [Revised: 01/05/2010] [Accepted: 01/09/2010] [Indexed: 02/08/2023]
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15
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Li YS, Ge YS, Zhang Y, Zhang AQ, Sun SF, Jiang FL, Liu Y. Interaction of coomassie brilliant blue G250 with human serum albumin: Probing of the binding mechanism and binding site by spectroscopic and molecular modeling methods. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.01.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Eriksson ESE, Santos DJVAD, Guedes RC, Eriksson LA. Properties and Permeability of Hypericin and Brominated Hypericin in Lipid Membranes. J Chem Theory Comput 2009; 5:3139-49. [DOI: 10.1021/ct9002702] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Emma S. E. Eriksson
- Örebro Life Science Center, School of Science and Technology, Örebro University, Fakultetsgatan 1, 70182 Örebro, Sweden, Modelling and Simulation Research Center, Örebro University, Örebro, Sweden, Department of Pharmacy, University of Lisbon, 1649-019 Lisbon, Portugal, and School of Chemistry, National University of Ireland, University Road, Galway, Ireland
| | - Daniel J. V. A. dos Santos
- Örebro Life Science Center, School of Science and Technology, Örebro University, Fakultetsgatan 1, 70182 Örebro, Sweden, Modelling and Simulation Research Center, Örebro University, Örebro, Sweden, Department of Pharmacy, University of Lisbon, 1649-019 Lisbon, Portugal, and School of Chemistry, National University of Ireland, University Road, Galway, Ireland
| | - Rita C. Guedes
- Örebro Life Science Center, School of Science and Technology, Örebro University, Fakultetsgatan 1, 70182 Örebro, Sweden, Modelling and Simulation Research Center, Örebro University, Örebro, Sweden, Department of Pharmacy, University of Lisbon, 1649-019 Lisbon, Portugal, and School of Chemistry, National University of Ireland, University Road, Galway, Ireland
| | - Leif A. Eriksson
- Örebro Life Science Center, School of Science and Technology, Örebro University, Fakultetsgatan 1, 70182 Örebro, Sweden, Modelling and Simulation Research Center, Örebro University, Örebro, Sweden, Department of Pharmacy, University of Lisbon, 1649-019 Lisbon, Portugal, and School of Chemistry, National University of Ireland, University Road, Galway, Ireland
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Sanders L, Halder M, Xiao TL, Ding J, Armstrong DW, Petrich JW. The Separation of Hypericin's Enantiomers and Their Photophysics in Chiral Environments¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2005.tb01539.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Plaza P, Mahet M, Martin MM, Checcucci G, Lenci F. Target Analysis of Primary Photoprocesses Involved in the Oxyblepharismin-Binding Protein. J Phys Chem B 2007; 111:690-6. [PMID: 17249812 DOI: 10.1021/jp0642591] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Target analysis is performed on previously published transient absorption spectra of the 200-kDa oxyblepharismin-binding protein (OBIP) thought to trigger the photophobic response of the ciliate Blepharisma japonicum. The OBIP sample is considered as heterogeneous and made of two distinct classes of chromophore-protein complexes. A so-called nonreactive class is seen to be comparable to free oxyblepharismin in organic solution. Another, reactive, class is shown to undergo a fast picosecond photocycle involving the formation in 4 ps of an intermediate state noted Y1. The spectrum associated to Y1 bears striking similarities with that of the oxyblepharismin radical cation. This element favors the hypothesis that an excited-state intermolecular electron-transfer could be the primary step of the sensory transduction chain of B. japonicum. Proton release is also considered as a possible secondary step. These possibilities support the idea that reactive OBIP functions like an electron or proton pump. We alternatively propose a new hypothesis stating that the fast photocycle of reactive OBIP actually does not generate any photoproduct or protein change of conformation but is involved in another biological function. It would act as a kind of solar screen, providing additional protection to the light-adapted form of B. japonicum in case of excessive illumination.
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Affiliation(s)
- Pascal Plaza
- Département de Chimie, UMR 8640 CNRS-ENS, Ecole Normale Supérieure, 24 rue Lhomond, 75005 Paris, France.
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Mahet M, Plaza P, Martin M, Checcucci G, Lenci F. Primary photoprocesses in oxyblepharismin interacting with its native protein partner. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.06.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Chowdhury MH, Gant VA, Trache A, Baldwin A, Meininger GA, Coté GL. Use of surface-enhanced Raman spectroscopy for the detection of human integrins. JOURNAL OF BIOMEDICAL OPTICS 2006; 11:024004. [PMID: 16674194 DOI: 10.1117/1.2187022] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Current research has revealed the importance of a class of cell surface proteins called integrins in various vital physiological functions such as blood clotting, regulation of blood pressure, tissue blood flow, and vascular remodeling. The key to integrin functionality is its ability to mediate force transmission by interacting with the extracellular matrix and cytoskeleton. In addition, they play a role in signal transduction via their connection with the proteins in focal adhesion (FA) points. To understand the complex mechanism of cell-cell and cell-extracellular matrix (ECM) adhesion that is responsible for these diverse biochemical interactions, it is necessary to identify the integrins on cells and monitor their interaction with various ligands. To this end, for the first time, we employ surface-enhanced Raman spectroscopy (SERS) to detect integrins. The results show the capability using SERS to detect the integrins to the nanomolar concentration regime and to distinguish between two different kinds of integrins, alphaVbeta3 and alpha5beta1, that are present in vascular smooth muscle cells (VSMCs). It is anticipated that the SERS approach will potentially help elucidate the mechanism of integrin-ligand interactions in a variety of phenomena of physiological importance.
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Affiliation(s)
- Mustafa H Chowdhury
- Texas A&M University, Department of Biomedical Engineering, College Station, Texas 77843-3120, USA
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Cañamares MV, Sevilla P, Sanchez-Cortes S, Garcia-Ramos JV. Surface-enhanced Raman scattering study of the interaction of red dye alizarin with ovalbumin. Biopolymers 2006; 82:405-9. [PMID: 16421915 DOI: 10.1002/bip.20450] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Surface-enhanced Raman spectroscopy and UV-vis absorption spectroscopy were employed to study the interaction between the red dye alizarin and ovalbumin (OA), to check the effect of binding media usually employed when applying this pigment in painting practices based on egg tempera. The protein/alizarin interaction is rather weak and takes place through the alizarin neutral form, which interacts with exposed hydrophobic moieties of OA. This effect is of great interest from an artistic point of view because the dye color can be modified. Furthermore, the interaction with alizarin could induce a change in the protein structure, leading to a denaturation and subsequent aggregation.
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Affiliation(s)
- M V Cañamares
- Instituto de Estructura de la Materia CSIC, Serrano 121, 28006 Madrid, Spain
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Sanders L, Halder M, Xiao TL, Ding J, Armstrong DW, Petrich JW. The Separation of Hypericin's Enantiomers and Their Photophysics in Chiral Environments¶. Photochem Photobiol 2005. [DOI: 10.1562/2004-05-28-rn-181.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kascakova S, Refregiers M, Jancura D, Sureau F, Maurizot JC, Miskovsky P. Fluorescence Spectroscopic Study of Hypericin-photosensitized Oxidation of Low-density Lipoproteins. Photochem Photobiol 2005; 81:1395-403. [PMID: 15960595 DOI: 10.1562/2005-04-28-ra-503] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
By means of UV-VIS absorption and fluorescence spectroscopy, we demonstrate that the photosensitizer hypericin (Hyp) interacts nonspecifically with low-density lipoproteins (LDL), most probably with the lipid fraction of LDL. The molar ratio of monomeric Hyp binding to nonoxidized LDL and mildly oxidized LDL is 30:1. Increasing the Hyp concentration further leads to the formation of Hyp aggregates inside the LDL molecule. We also demonstrate that photoactivated Hyp oxidizes LDL in a light dose and excitation wavelength dependent manner. The level of oxidation of LDL depends on the amount of Hyp inside the LDL molecule. The maximum of the photosensitized oxidation of the LDL by Hyp is achieved for a 30:1 molar ratio, which corresponds to the maximum concentration of monomeric form of Hyp in LDL.
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Affiliation(s)
- Slavka Kascakova
- Department of Biophysics, University of P. J. Safarik, Kosice, Slovak Republic
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Alizadeh-Pasdar N, Li-Chan ECY, Nakai S. FT-Raman spectroscopy, fluorescent probe, and solvent accessibility study of egg and milk proteins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2004; 52:5277-5283. [PMID: 15291508 DOI: 10.1021/jf035375t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Due to possible contribution of both electrostatic and hydrophobic interactions, use of anionic fluorescent probes such as 1-anilinonaphthalene-8-sulfonic acid (ANS) and cis-parinaric acid (CPA) for the measurement of protein surface hydrophobicity (S0) has been controversial. A neutral probe, 6-propionyl-2-(dimethylamino)-naphthalene (PRODAN), may circumvent this problem. To select the best indicator of S0, in this study, the data for nine model proteins in phosphate buffer, pH 7.5, measured using the above-mentioned probes, was compared to their FT-Raman spectra and calculated solvent accessibility values. Log S0 measured using CPA had the highest correlation (r = 0.874) with the intensities of Raman spectral signals at 760 cm(-1) and 2800-3100 cm(-1), which were combined using a mixture design based on the random-centroid optimization. The order of correlation of Raman spectral parameters with S0 values were CPA > PRODAN > ANS. FT-Raman spectroscopy, therefore, identified CPA, followed by PRODAN, as the fluorescent probe of choice for describing surface hydrophobicity. However, the amino acid surface accessibility calculated using the PredictProtein software was not useful in identifying the best fluorescent probe for the measurement of S0.
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Affiliation(s)
- Nooshin Alizadeh-Pasdar
- The University of British Columbia, Faculty of Agricultural Sciences, Food, Nutrition, and Health program, Food Science Building, 6640 N.W. Marine Drive, Vancouver, British Columbia, Canada V6T 1Z4.
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Fabriciova G, Sanchez-Cortes S, Garcia-Ramos JV, Miskovsky P. Surface-enhanced Raman spectroscopy study of the interaction of the antitumoral drug emodin with human serum albumin. Biopolymers 2004; 74:125-30. [PMID: 15137109 DOI: 10.1002/bip.20058] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Surface-enhanced Raman spectroscopy was employed in this work to study the interaction between the antitumoral drug emodin and human serum albumin (HSA), as well as the influence of fatty acids in this interaction. We demonstrated that the drug/protein interaction can take place through two different binding sites which are probably localized in the IIA and IIIA hydrophobic pockets of HSA and which correspond to Sudlow's I and II binding sites, respectively. The primary interaction site of this drug seems to be site II in the defatted albumin. Fatty acids seem to displace the drug from site II to site I in nondefatted HSA, due to the high affinity of fatty acids for site II. The drug interacts with the protein through its dianionic form in defatted HSA (when placed in the site II) and through its neutral form in the site I of nondefatted albumins.
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Affiliation(s)
- G Fabriciova
- Department of Biophysics, P. J. Safarik University of Kosice, Jessenná 5, 041 54 Kosice, Slovakia
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Hritz J, Kascakova S, Ulicny J, Miskovsky P. Influence of structure of human, rat, and bovine serum albumins on binding properties of photoactive drug hypericin. Biopolymers 2002; 67:251-4. [PMID: 12012440 DOI: 10.1002/bip.10110] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fluorescence binding measurements and molecular modeling were employed to study the interaction of hypericin (Hyp) with human (HSA), rat (RSA), and bovine (BSA) serum albumins. Fluorescence emission data show the solubility of Hyp increasing in the order BSA, HSA, and RSA. Molecular modeling was used to construct the detailed structural models of the complexes and to explain the differences in the binding properties of Hyp. It was shown that the structures of Hyp/HSA and Hyp/RSA complexes are more similar and in some aspects different from those found for the Hyp/BSA complex. The role of the amino acid sequence in the IIA subdomains of HSA, RSA, and BSA is discussed to explain the observed differences.
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Affiliation(s)
- Jozef Hritz
- Department of Biophysics, P. J. Safarik University, Jesenna 5, 041 54 Kosice, Slovak Republic
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