1
|
Szafraniec MJ. Interactions of chlorophyll-derived photosensitizers with human serum albumin are determined by the central metal ion. J Biomol Struct Dyn 2023; 41:479-492. [PMID: 34844514 DOI: 10.1080/07391102.2021.2007794] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Two structurally similar derivatives of chlorophyll a, chlorophyllide a (Chlide) and zinc-pheophorbide a (Zn-Pheide), differing only in central metal ion (Mg2+ or Zn2+, respectively) substituting the tetrapyrrole ring, were investigated with regard to their binding to human serum albumin (HSA). Chlide and Zn-Pheide are very promising photosensitizers with potential application in photodynamic therapy, therefore it is desirable to investigate their interactions with serum proteins. The studies included absorption and steady-state fluorescence spectroscopy, as well as molecular docking. It was found that both investigated compounds form complexes with HSA. Experimental data revealed two classes of binding sites for each compound. The affinities (Ka) for the first class were in the range of 105 and 106 M-1 for Chlide and Zn-Pheide, respectively, while the second class was characterized by the affinities of the order of 104 M-1 for both derivatives. Molecular docking simulations together with displacement studies revealed that the primary binding site of the studied compounds is the heme site, localized in the subdomain IB, however the best characterized binding sites of HSA, namely the Sudlow's sites I and II are also involved. The interactions between the derivatives of chlorophyll and HSA were found to be predominantly hydrophobic and to a lesser extent hydrogen bonding. Our results demonstrate that the centrally bound metal ion determines both the affinity and mode of binding to HSA, which may be a feature differentiating these compounds in terms of their pharmacokinetics.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Milena J Szafraniec
- Łukasiewicz Research Network - PORT Polish Center for Technology Development, Wrocław, Poland
| |
Collapse
|
2
|
Lebedeva NS, Yurina ES, Gubarev YA, Koifman OI. Molecular mechanisms causing albumin aggregation. The main role of the porphyrins of the blood group. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 246:118975. [PMID: 33017788 DOI: 10.1016/j.saa.2020.118975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/30/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
In this paper was studied the interaction of deutero- and hematoporphyrin with bovine serum albumin, using various methods of physico-chemical analysis. It was established that the localization of porphyrins occurred in the IB subdomain, while hematoporphyrin interacted with the protein in a monomeric form, and deuteroporphyrin - as a J-dimer. Based on spectral studies, the affinity constants of binding albumin with porphyrins were determined, and the affinity of the protein for deuteroporphyrin appeared to be higher than for hematoporphyrin. It was shown that the interaction of albumin with the studied porphyrins led to a change in the secondary structure of the protein, it being accompanied by a decrease in the proportion of disordered protein fragments and an increase in β-folding.
Collapse
Affiliation(s)
- Natalia Sh Lebedeva
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo 153045, Russia
| | - Elena S Yurina
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo 153045, Russia
| | - Yury A Gubarev
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo 153045, Russia.
| | - Oskar I Koifman
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo 153045, Russia; Ivanovo State University of Chemistry and Technology, 153000 Ivanovo, Russia
| |
Collapse
|
3
|
Ionophoric polyphenols are permeable to the blood–brain barrier, interact with human serum albumin and Calf Thymus DNA, and inhibit AChE enzymatic activity. Med Chem Res 2020. [DOI: 10.1007/s00044-020-02615-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
4
|
Zhao W, Xiong M, Liu M, Wang S, Xian X, Lin B, Li H. Evaluation of the effect of Tb(IV)-NR complex on herring sperm DNA genetic information by mean of spectroscopic. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2020; 39:964-978. [PMID: 32043411 DOI: 10.1080/15257770.2020.1725042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The interaction between Tb(IV)-NR complex and herring sperm DNA in buffer solution of Tris-HCl was investigated with the use of acridine orange(AO) as a spectral probe. The binding modes and other information were provided by the UV-spectrophotometry and fluorescence spectroscopy. The thermodynamic functions expressed that the binding constants of Tb(IV)-NR complex with DNA was Kθ298.15K = 4.03 × 105 L·mol-1, Kθ310.15K =1.30 × 107 L·mol-1, and the ΔrGθ m 298.15 K=-3.20 × 104 J·mol-1. The scatchard equation suggested that the interaction mode between Tb(IV)-NR complex and herring sperm DNA is electrostatic and weak intercalation bindings. FTIR spectroscopy results also indicate that there is a specific interaction between the Tb(IV)-NR complex and the A and G bases of DNA.
Collapse
Affiliation(s)
- Weihua Zhao
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Mei Xiong
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Mingbin Liu
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Suqin Wang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Xiao Xian
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Baoping Lin
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| | - Hongbo Li
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, PR China
| |
Collapse
|
5
|
Abstract
To assess the potential cytostatic properties of the thulium(III)-arsenazo III complex as a probe of rare earth complex antitumor drugs, the interaction information of the thulium(III)-arsenazo III complex with DNA was obtained by using spectroscopy, viscosity measurements, and voltammetric methods. The thermodynamic functions demonstrated that the binding constants of the thulium(III)-arsenazo III complex with DNA were Kθ298.15K = 4.84 × 106 L·mol−1 and Kθ308.15K = 4.48 × 106 L·mol−1, and the binding process was enthalpy driven. The increase in relative viscosity of DNA with the addition of the thulium(III)-arsenazo III complex and the results from Scatchard and voltammetric methods showed that the interaction mode between the thulium(III)-arsenazo III complex and DNA was groove binding along with weak intercalative binding.
Collapse
|
6
|
Liu YC, Li YY, Yao XJ, Qi HL, Wei XX, Liu JN. Binding Performance of Human Intravenous Immunoglobulin and 20( S)-7-Ethylcamptothecin. Molecules 2018; 23:E2389. [PMID: 30231526 PMCID: PMC6225142 DOI: 10.3390/molecules23092389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 08/20/2018] [Accepted: 09/12/2018] [Indexed: 11/25/2022] Open
Abstract
A previous study showed that intravenous immunoglobulin (IVIG) could preserve higher levels of biologically active lactone moieties of topotecan, 7-ethyl-10-hydroxycamptothecin (SN-38) and 10-hydroxycamptothecin at physiological pH 7.40. As one of camptothecin analogues (CPTs), the interaction of 7-ethylcamptothecin and IVIG was studied in vitro in this study. It was shown that the main binding mode of IVIG to 7-ethylcamptothecin was hydrophobic interaction and hydrogen bonding, which is a non-specific and spontaneous interaction. The hydrophobic antigen-binding cavity of IgG would enwrap the drug into a host-guest inclusion complex and prevent hydrolysis of the encapsulated drug, while the drug is adjacent to the chromophores of IgG and may exchange energy with chromophores and quench the fluorescence of the protein. Also, the typical β-sheet structure of IVIG unfolded partially after binding to 7-ethylcamptothecin. Additionally, the binding properties of IVIG and six CPTs with different substituents at A-ring and/or B-ring including camptothecin, topotecan, irinotecan, 10-hydroxycamptothecin, 7-ethylcamptothecin and SN-38 were collected together and compared each other. Synergizing with anti-cancer drugs, IVIG could be used as a transporter protein for 7-ethylcamptothecin and other CPTs, allowing clinicians to devise new treatment protocols for patients.
Collapse
Affiliation(s)
- Yong-Chun Liu
- College of Chemistry and Chemical Engineering, Longdong University, Qingyang 745000, China.
- Longdong University & FLUOBON Collaborative Innovation Center, Longdong University, Qingyang 745000, China.
| | - Ying-Ying Li
- College of Chemistry and Chemical Engineering, Longdong University, Qingyang 745000, China.
- Longdong University & FLUOBON Collaborative Innovation Center, Longdong University, Qingyang 745000, China.
| | - Xiao-Jun Yao
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
| | - Hui-Li Qi
- College of Chemistry and Chemical Engineering, Longdong University, Qingyang 745000, China.
- Longdong University & FLUOBON Collaborative Innovation Center, Longdong University, Qingyang 745000, China.
| | - Xiao-Xia Wei
- College of Chemistry and Chemical Engineering, Longdong University, Qingyang 745000, China.
- Longdong University & FLUOBON Collaborative Innovation Center, Longdong University, Qingyang 745000, China.
| | - Jian-Ning Liu
- College of Chemistry and Chemical Engineering, Longdong University, Qingyang 745000, China.
- Longdong University & FLUOBON Collaborative Innovation Center, Longdong University, Qingyang 745000, China.
| |
Collapse
|
7
|
Voicescu M, Ionescu S, Lete C. Physicochemical and Antioxidant Properties of Riboflavin in Dextran70/HSA Systems. J Fluoresc 2018; 28:889-896. [DOI: 10.1007/s10895-018-2251-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Accepted: 06/07/2018] [Indexed: 10/28/2022]
|
8
|
Mork-Jansson AE, Eichacker LA. Characterization of chlorophyll binding to LIL3. PLoS One 2018; 13:e0192228. [PMID: 29390011 PMCID: PMC5794176 DOI: 10.1371/journal.pone.0192228] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 12/22/2017] [Indexed: 12/04/2022] Open
Abstract
The light harvesting like protein 3 (LIL 3) from higher plants, has been linked to functions in chlorophyll and tocopherol biosynthesis, photo-protection and chlorophyll transfer. However, the binding of chlorophyll to LIL3 is unclear. We present a reconstitution protocol for chlorophyll binding to LIL3 in DDM micelles. It is shown in the absence of lipids and carotenoids that reconstitution of chlorophyll binding to in vitro expressed LIL3 requires pre-incubation of reaction partners at room temperature. We show chlorophyll a but not chlorophyll b binding to LIL3 at a molar ratio of 1:1. Neither dynamic light scattering nor native PAGE, enabled a discrimination between binding of chlorophyll a and/or b to LIL3.
Collapse
Affiliation(s)
| | - Lutz Andreas Eichacker
- Centre for Organelle Research, Faculty of Science and Technology, University of Stavanger, Stavanger, Norway
- * E-mail:
| |
Collapse
|
9
|
Liu Y, Li Y, Yao X, Li Y, Qi H, Zhang K, Lei R, Liu J. Interaction of intravenous immunoglobulin and three 20(S)-camptothecin analogs: maintaining higher circulatory levels of the biologically active species. Med Chem Res 2017. [DOI: 10.1007/s00044-017-2021-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
10
|
Wu J, Li X, Wan W, Yang Q, Ma W, Chen D, Hu J, Chen CYO, Wei X. Gigantol from Dendrobium chrysotoxum Lindl. binds and inhibits aldose reductase gene to exert its anti-cataract activity: An in vitro mechanistic study. JOURNAL OF ETHNOPHARMACOLOGY 2017; 198:255-261. [PMID: 28104409 DOI: 10.1016/j.jep.2017.01.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 01/10/2017] [Accepted: 01/15/2017] [Indexed: 05/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Dendrobium. chrysotoxum Lindl is a commonly used species of medicinal Dendrobium which belongs to the family of Orchidaceae, locally known as "Shihu" or "Huangcao". D. chrysotoxum Lindl is widely known for medicinal values in traditional Chinese medicine as it possesses anti-inflammatory, anti-hyperglycemic induction, antitumor and antioxidant properties. STUDY AIM To characterize the interaction between gigantol extracted from D. chrysotoxum Lindl and the AR gene, and determine gigantol's efficacy against cataractogenesis. MATERIALS AND METHODS Human lens epithelial cells (HLECs) were induced by glucose as the model group. Reverse transcription polymerase chain reaction (RT-PCR) was used to assess AR gene expression. Then, the mode of interaction of gigantol with the AR gene was evaluated by UV-visible spectroscopy, atomic force microscope (AFM) and surface-enhanced Raman spectroscopy (SERS). The binding constant was determined by UV-visible. RESULTS Gigantol depressed AR gene expression in HLECs. UV-visible spectra preliminarily indicated that interaction between the AR gene and gigantol may follow the groove mode, with a binding constant of 1.85×103L/mol. Atomic force microscope (AFM) data indicated that gigantol possibly bound to insert AR gene base pairs of the double helix. Surface-enhanced Raman spectroscopy (SERS) studies further supported these observations. CONCLUSION Gigantol extracted from D. chrysotoxum Lindl not only has inhibitory effects on aldose reductase, but also inhibits AR gene expression. These findings provide a more comprehensive theoretical basis for the use of Dendrobium for the treatment of diabetic cataract.
Collapse
Affiliation(s)
- Jie Wu
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Xue Li
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Wencheng Wan
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Qiaohong Yang
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Weifeng Ma
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Dan Chen
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Jiangmiao Hu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China
| | - C-Y Oliver Chen
- Antioxidants Research Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA
| | - Xiaoyong Wei
- School of Basic Medical Sciences, Guangzhou University of Chinese Medicine, Guangzhou 510006, China; Antioxidants Research Laboratory, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA.
| |
Collapse
|
11
|
Xiong XL, You C, Xue K, Huang JH, Wang CL. Synthesis, characterization, and DNA binding studies of the hematoxylin-Zn(II) complex. INORG NANO-MET CHEM 2016. [DOI: 10.1080/15533174.2016.1216453] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Xiao-Li Xiong
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China
| | - Chao You
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China
| | - Kang Xue
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, China
| | - Jian-Hang Huang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, China
| | - Chun-Ling Wang
- College of Chemical Engineering, Sichuan University, Chengdu, China
| |
Collapse
|
12
|
CHENG XIN, YU GUOJUN, HU JIANGPING, XU XUEFENG, LUO FANG, SHEN PING, ZHANG GUOSHENG, YANG NING. Clinical study of Shengxuening tablet combined with rHuEPO for the treatment of renal anemia of maintenance hemodialysis patients. Exp Ther Med 2016; 12:157-160. [PMID: 27347032 PMCID: PMC4906941 DOI: 10.3892/etm.2016.3307] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 04/28/2016] [Indexed: 12/16/2022] Open
Abstract
The aim of the present study was to investigate the clinical effects of Shengxuening tablet (silkworm excrement) combined with recombinant human erythropoietin (rHuEPO) for the treatment of renal anemia of maintenance hemodialysis (MHD) patients. Seventy-two MHD patients with renal anemia were included in the study and randomly divided into the control (n=34) and observation (n=38) groups. Patients in the control group were treated by hypodermic injection of 100-150 U/(kg·w) rHuEPO and patients in the observation group were treated by rHuEPO + 1.0 g t.i.d. p.o. Shengxuening tablet. The two groups were assisted by conventional treatments including iron, folic acid, vitamin B12 and L-carnitine. After 3 and 6 months, improvement of anemia was compared. After 3 months, the hemoglobin, hematocrit, serum ferritin and transferrin saturation levels of the observation group were significantly higher than those of the control group (p<0.05). In addition, C-reactive protein and superoxide dismutase levels of the observation group were significantly lower than those of the control group (p<0.05). After 6 months, indices of the observation group were ameliorated while the improvement of control group was not obvious, and indices of the observation group were significantly higher than those of the control group (p<0.05). Consumption of rHuEPO in the observation group was significantly less than that of the control group, and the total effective rate was significantly higher than that of the control group (p<0.05). In conclusion, Shengxuening tablet combined with rHuEPO was safe and effective for the treatment of renal anemia of MHD patients.
Collapse
Affiliation(s)
- XIN CHENG
- Division of Nephrology, Zhengzhou TCM Hospital, Zhengzhou, Henan 450000, P.R. China
| | - GUOJUN YU
- Division of Nephrology, The Affiliated Hospital of Henan Province Chinese Medicine Research Institute, Zhengzhou, Henan 450004, P.R. China
| | - JIANGPING HU
- Division of Nephrology, Zhengzhou TCM Hospital, Zhengzhou, Henan 450000, P.R. China
| | - XUEFENG XU
- Division of Nephrology, Zhengzhou TCM Hospital, Zhengzhou, Henan 450000, P.R. China
| | - FANG LUO
- Division of Endocrinology, Zhengzhou Central Hospital, Zhengzhou, Henan 450007, P.R. China
| | - PING SHEN
- Division of Nephrology, Zhengzhou TCM Hospital, Zhengzhou, Henan 450000, P.R. China
| | - GUOSHENG ZHANG
- Division of Nephrology, Zhengzhou TCM Hospital, Zhengzhou, Henan 450000, P.R. China
| | - NING YANG
- Department of Science and Education, Zhengzhou TCM Hospital, Zhengzhou, Henan 450000, P.R. China
| |
Collapse
|
13
|
Study on the interaction of three structurally related cationic Pt(II) complexes with human serum albumin: importance of binding affinity and denaturing properties. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2015. [DOI: 10.1007/s13738-015-0773-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
14
|
Xiong X, Huang J, Wang X. DNA binding studies of hematoxylin-Dy(ш) complex by spectrometry using acridine orange as a probe. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2015; 33:730-45. [PMID: 25295749 DOI: 10.1080/15257770.2014.931589] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The interaction of a hematoxylin(HE)-Dy(Ш) complex with herring sperm DNA(hsDNA) was studied using acridine orange(AO) as a probe by UV-vis absorption, circular dichroism(CD), fluorescence spectroscopy and viscosity measurements. From the results of the probe experiment, we found that the HE-Dy(Ш) complex could compete with AO for intercalating into hsDNA. The binding constants of the HE-Dy(Ш) complex to hsDNA was obtained by the double reciprocal method and indicated that the affinity between hsDNA and the complex is weaker than that between hsDNA and classical intercalators. The thermodynamic parameters(ΔH°, ΔG°, ΔS°) were calculated from the UV-vis absorption data measured at two different temperatures. Further experimental results suggested that there exist groove binding and partial intercalation binding between hsDNA and HE-Dy(Ш) complex.
Collapse
Affiliation(s)
- Xiaoli Xiong
- a College of Chemistry and Materials Science , Sichuan Normal University , Chengdu , P.R.China
| | | | | |
Collapse
|
15
|
Interactions of Isophorone Derivatives with DNA: Spectroscopic Studies. PLoS One 2015; 10:e0129817. [PMID: 26069963 PMCID: PMC4466397 DOI: 10.1371/journal.pone.0129817] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Accepted: 05/12/2015] [Indexed: 12/19/2022] Open
Abstract
Interactions of three new isophorone derivatives, Isoa Isob and Isoc with salmon testes DNA have been investigated using UV-Vis, fluorescence and circular dichroism spectroscopic methods. All the studied compounds interact with DNA through intercalative binding mode. The stoichiometry of the isophorone/DNA adducts was found to be 1:1. The fluorescence quenching data revealed a binding interaction with the base pairs of DNA. The CD data indicate that all the investigated isophorones induce DNA modifications.
Collapse
|
16
|
Xiong XL, Zhao N, Wang XM. Interaction between tryptophan-Sm(III) complex and DNA with the use of a acridine orange dye fluorophor probe. LUMINESCENCE 2015; 31:210-6. [PMID: 26016416 DOI: 10.1002/bio.2947] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Revised: 03/12/2015] [Accepted: 04/24/2015] [Indexed: 12/28/2022]
Abstract
The interaction of the Trp-Sm(III) complex with herring sperm DNA (hs-DNA) was investigated with the use of acridine orange (AO) dye as a spectral probe for UV-vis spectrophotometry and fluorescence spectroscopy. The results showed that the both the Trp-Sm(III) complex and the AO molecule could intercalate into the double helix of the DNA. The Sm(III)-(Trp)3 complex was stabilized by intercalation into the DNA with binding constants: K(Ө)25°C = 7.14 × 10(5) L·mol(-1) and K(Ө) 37°C = 5.28 × 10(4) L·mol(-1), and it could displace the AO dye from the AO-DNA complex in a competitive reaction. Computation of the thermodynamic functions demonstrates that Δr Hm (Ө) is the primary driving power of the interaction between the Sm(III)(Trp)3 complex and the DNA. The results from Scatchard and viscometry methods suggested that the interaction mode between the Sm(III)(Trp)3 complex and the hs-DNA is groove binding and weak intercalation binding.
Collapse
Affiliation(s)
- Xiao Li Xiong
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, People's Republic of China
| | - Na Zhao
- Beijing City University Academic Affairs Office, Beijing, 100083, People's Republic of China
| | - Xing Ming Wang
- Department of Chemistry, School Materials Science and Engineering, Southwest University of Science and Technology, Sichuan, Mianyang, 621010, People's Republic of China
| |
Collapse
|
17
|
Morphological analysis and interaction of chlorophyll and BSA. BIOMED RESEARCH INTERNATIONAL 2014; 2014:872701. [PMID: 24963490 PMCID: PMC4052157 DOI: 10.1155/2014/872701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 04/21/2014] [Accepted: 04/21/2014] [Indexed: 12/04/2022]
Abstract
Interactions between proteins and drugs, which can lead to formation of stable drug-protein complexes, have important implications on several processes related to human health. These interactions can affect, for instance, free concentration, biological activity, and metabolism of the drugs in the blood stream. Here, we report on the UV-Visible spectroscopic investigation on the interaction of bovine serum albumin (BSA) with chlorophyll (Chl) in aqueous solution under physiological conditions. Binding constants at different temperatures—obtained by using the Benesi-Hildebrand equation—were found to be of the same order of magnitude (~104 M−1) indicating low affinity of Chl with BSA. We have found a hyperchromism, which suggested an interaction between BSA and Chl occurring through conformational changes of BSA caused by exposition of tryptophan to solvent. Films from BSA and Chl obtained at different Chl concentrations showed fractal structures, which were characterized by fractal dimension calculated from microscopic image analysis.
Collapse
|
18
|
Tunç S, Duman O, Soylu I, Kancı Bozoğlan B. Study on the bindings of dichlorprop and diquat dibromide herbicides to human serum albumin by spectroscopic methods. JOURNAL OF HAZARDOUS MATERIALS 2014; 273:36-43. [PMID: 24709480 DOI: 10.1016/j.jhazmat.2014.03.022] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 03/10/2014] [Accepted: 03/11/2014] [Indexed: 06/03/2023]
Abstract
The interactions of dichlorprop (DCP) and diquat dibromide (DQ) herbicides with human serum albumin (HSA) protein were studied by UV absorption, fluorescence, synchronous fluorescence and circular dichroism (CD) spectroscopy. Both DCP and DQ quenched the fluorescence emission spectrum of HSA through the static quenching mechanism. The Stern-Volmer quenching constant, binding constant, the number of binding sites and thermodynamic parameters were determined at 288K, 298K, 310K and 318K. In HSA-DCP and HSA-DQ systems, an increase in temperature led to a decrease in the Stern-Volmer quenching constant and binding constant. One binding site was obtained for DCP and DQ on HSA. It was found that DCP can bind to HSA with higher affinity than DQ. Negative ΔH and positive ΔS values were obtained for the binding processes between protein and herbicide molecules. This result displayed that electrostatic interactions play a major role in the formation of HSA-DCP and HSA-DQ complexes. The binding processes were exothermic reactions and spontaneous. In addition, synchronous fluorescence and CD spectra of HSA revealed that the binding of DCP to HSA did not cause a significant conformational change in protein, but the interaction of DQ with HSA led to an alteration in the protein structure.
Collapse
Affiliation(s)
- Sibel Tunç
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey.
| | - Osman Duman
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey.
| | - Inanç Soylu
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey
| | - Bahar Kancı Bozoğlan
- Akdeniz University, Faculty of Science, Department of Chemistry, 07058 Antalya, Turkey
| |
Collapse
|
19
|
Determination of LMF binding site on a HSA-PPIX complex in the presence of human holo transferrin from the viewpoint of drug loading on proteins. PLoS One 2014; 9:e84045. [PMID: 24392106 PMCID: PMC3879261 DOI: 10.1371/journal.pone.0084045] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 11/18/2013] [Indexed: 12/21/2022] Open
Abstract
Holo transferrin (TF) and the natural complex of human serum albumin and protoporphyrin IX (HSA-PPIX) are two serum carrier proteins that can interact with each other. Such an interaction may alter their binding sites. In this study, fluorescence spectroscopy, as well as zeta potential and molecular modeling techniques, have been used to compare the complexes (HSA-PPIX)-LMF and [(HSA-PPIX)-TF]-LMF. The Ka1, Ka2, values of (HSA-PPIX)-LMF and [(HSA-PPIX)-TF]-LMF were 1.1×10(5) M(-1), 9.7×10(6) M(-1), and 2.0×10(4) M(-1), 1.8×10(5) M(-1), respectively, and the n1, n2 values were respectively 1.19, 1.53 and 1.17, 1.65. The second derivative of the Trp emission scan of (HSA-PPIX)-LMF exhibited one negative band at 310 nm, whereas for the [(HSA-PPIX)-TF]-LMF system, we observed one negative band at 316 nm indicating an increase in polarity around Trp. The effect of TF on the conformation of (HSA-PPIX)-TF was analyzed using three-dimensional fluorescence spectroscopy. The phase diagram indicated that the presence of a second binding site on HSA and TF was due to the existence of intermediate structures. Zeta potential analysis showed that the presence of TF increased the positive charges of the HSA-PPIX system. Site marker experiments revealed that the binding site of LMF to HSA-PPIX changed from Sudlow's site IIA to Sudlow's site IIIB in the presence of TF. Moreover, molecular modeling studies suggested the sub-domain IIIB in HSA as the candidate place for the formation of the binding site of LMF on the (HSA-PPIX)-TF complex.
Collapse
|
20
|
Monrad RN, Errey JC, Barry CS, Iqbal M, Meng X, Iddon L, Perrie JA, Harding JR, Wilson ID, Stachulski AV, Davis BG. Dissecting the reaction of Phase II metabolites of ibuprofen and other NSAIDS with human plasma protein. Chem Sci 2014. [DOI: 10.1039/c4sc01329h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Blood-protein transacylation/glycosylation reactivity of glucuronides may distinguish beneficial (e.g., ibuprofen) and toxic (e.g., ibufenac) drugs.
Collapse
Affiliation(s)
- Rune Nygaard Monrad
- Chemistry Research Laboratory
- Department of Chemistry
- University of Oxford
- Oxford, UK
| | - James C. Errey
- Chemistry Research Laboratory
- Department of Chemistry
- University of Oxford
- Oxford, UK
| | - Conor S. Barry
- Chemistry Research Laboratory
- Department of Chemistry
- University of Oxford
- Oxford, UK
| | - Mazhar Iqbal
- The Robert Robinson Laboratories
- Department of Chemistry
- University of Liverpool
- Liverpool, UK
| | - Xiaoli Meng
- The Robert Robinson Laboratories
- Department of Chemistry
- University of Liverpool
- Liverpool, UK
| | - Lisa Iddon
- The Robert Robinson Laboratories
- Department of Chemistry
- University of Liverpool
- Liverpool, UK
| | - Jennifer A. Perrie
- The Robert Robinson Laboratories
- Department of Chemistry
- University of Liverpool
- Liverpool, UK
| | - John R. Harding
- Drug Metabolism and Pharmacokinetics
- Astra Zeneca
- Cheshire SK10 4TG, UK
| | - Ian D. Wilson
- Drug Metabolism and Pharmacokinetics
- Astra Zeneca
- Cheshire SK10 4TG, UK
| | - Andrew V. Stachulski
- The Robert Robinson Laboratories
- Department of Chemistry
- University of Liverpool
- Liverpool, UK
| | - Benjamin G. Davis
- Chemistry Research Laboratory
- Department of Chemistry
- University of Oxford
- Oxford, UK
| |
Collapse
|
21
|
Ozmen M, Maltas E, Patir IH, Bayrakci M. Combined voltammetric and spectroscopic investigation of binding interaction between nifedipine and human serum albumin on polyelectrolyte modified ITO electrode. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.08.130] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
22
|
Yang H, Wang XM. Spectroscopic studies on the interaction of β-cyclodextrin-8-Hydroxyquiuoline inclusion complex with herring sperm DNA. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.09.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
23
|
Kanakis CD, Tarantilis PA, Polissiou MG, Diamantoglou S, Tajmir-Riahi HA. DNA Interaction with Naturally Occurring Antioxidant Flavonoids Quercetin, Kaempferol, and Delphinidin. J Biomol Struct Dyn 2012; 22:719-24. [PMID: 15842176 DOI: 10.1080/07391102.2005.10507038] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Flavonoids are strong antioxidants that prevent DNA damage. The anticancer and antiviral activities of these natural products are implicated in their mechanism of actions. However, there has been no information on the interactions of these antioxidants with individual DNA at molecular level. This study was designed to examine the interaction of quercetin (que), kaempferol (kae), and delphinidin (del) with calf-thymus DNA in aqueous solution at physiological conditions, using constant DNA concentration (6.5 mmol) and various drug/DNA(phosphate) ratios of 1/65 to 1. FTIR and UV-Visible difference spectroscopic methods are used to determine the drug binding sites, the binding constants and the effects of drug complexation on the stability and conformation of DNA duplex. Structural analysis showed quercetin, kaempferol, and delphinidin bind weakly to adenine, guanine (major groove), and thymine (minor groove) bases, as well as to the backbone phosphate group with overall binding constants K(que) = 7.25 x 10(4)M(-1), K(kae) = 3.60 x 10(4)M(-1), and K(del) = 1.66 x 10(4)M(-1). The stability of adduct formation is in the order of que>kae>del. Delphinidin with a positive charge induces more stabilizing effect on DNA duplex than quercetin and kaempferol. A partial B to A-DNA transition occurs at high drug concentrations.
Collapse
Affiliation(s)
- C D Kanakis
- Laboratory of Chemistry, Department of Science, Agricultural University of Athens, 75 Iera Odos, 118 55 Athens, Greece
| | | | | | | | | |
Collapse
|
24
|
Huang J, Wang X. Spectroscopic investigations of interactions between Hematoxylin–Ag+ complex and Herring-sperm DNA with the aid of the acridine orange probe. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2011.11.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
25
|
Pan HZ, Wang XM, Zhang M, Ding LS. Synthesis, Characterization, and DNA Interaction Studies of Dysprosium(III) with Methylene Blue. ACTA ACUST UNITED AC 2011. [DOI: 10.1080/15533174.2011.591344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Hai-Zhuan Pan
- a Department of Chemistry, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang, P. R. China
| | - Xing-Ming Wang
- a Department of Chemistry, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang, P. R. China
| | - Min Zhang
- b The Key Lab of Biology and Organic Chemistry, Department of Chemistry , Zhengzhou University , Zhengzhou, P. R. China
| | - Li-sheng Ding
- c Chengdu Institute of Biology , Chinese Academy of Sciences , Chengdu, P. R China
| |
Collapse
|
26
|
Zhang S, Sun X, Jing Z, Qu F. Spectroscopic analysis on the resveratrol-DNA binding interactions at physiological pH. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 82:213-216. [PMID: 21856217 DOI: 10.1016/j.saa.2011.07.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 02/28/2011] [Accepted: 07/13/2011] [Indexed: 05/31/2023]
Abstract
The interaction of resveratrol with calf thymus deoxyribonucleic acid (ctDNA) under physiological conditions (Tris-HCl buffer solutions, pH 7.4) was studied by spectroscopy, fluorescence spectroscopy and viscosity measurement method, respectively. Results indicated that a complex of resveratrol with ctDNA was formed with a binding constant of K(17°C) = 5.49×10(3) L mol(-1) and K(37°C) = 1.90×10(4) L mol(-1). The fluorescence quenching mechanism of acridine orange (AO)-ctDNA by resveratrol was shown to be a static quenching type. The thermodynamic parameters of the complex were calculated by a double reciprocal method: Δ(r)H(m)(s) = 4.64×10(4) J mol(-1), Δ(r)S(m)(s) = 231.8 J K(-1) mol(-1) and Δ(r)G(m)(s) = -2.54×10(4) J mol(-1) (37°C). Spectroscopic techniques together with viscosity determination provided evidences of intercalation mode of binding for the interaction between resveratrol and ctDNA.
Collapse
Affiliation(s)
- Shufang Zhang
- College of Chemistry and Chemical Engineering, Qufu Normal University, Shandong, Qufu 273165, People's Republic of China.
| | | | | | | |
Collapse
|
27
|
Study on the interaction of tamiflu and oseltamivir carboxylate with human serum albumin. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2011; 105:34-9. [DOI: 10.1016/j.jphotobiol.2011.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 05/22/2011] [Accepted: 06/23/2011] [Indexed: 01/10/2023]
|
28
|
Huang J, Wang X, Ding L. Spectroscopic investigations of hematoxylin–Eu(III) complex interacting with Herring-sperm DNA. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.607234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Jianhang Huang
- a School of Materials Science and Engineering, Southwest University of Science and Technology , Mianyang 621010 , China
| | - Xingming Wang
- a School of Materials Science and Engineering, Southwest University of Science and Technology , Mianyang 621010 , China
| | - Lisheng Ding
- b Chengdu Institute of Biology, Chinese Academy of Sciences , Chengdu 610041 , China
| |
Collapse
|
29
|
Zhang Y, Wang X, Ding L. Synthesis and DNA binding studies of Mg(II) complex of Schiff base derived from vanillin and L-tryptophan. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2011; 30:49-62. [PMID: 21259163 DOI: 10.1080/15257770.2010.543117] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The Mg(II) complex of Schiff base (K[HL]) derived from vanillin and L-tryptophan could bind with herring sperm DNA. The binding behaviors between them in physiological pH environment (pH 7.40) have been studied by spectroscopy, cyclic voltammetry and viscosity methods. Binding ratios of n(Mg(II)): n(K[HL]) = 1:1 and n(Mg(II)L): n(DNA) = 5:1 were confirmed. The obtained thermodynamic parameters suggest that the interaction between Mg(II)L and DNA is driven mainly by entropy. Combined with fluorimeteric studies, cyclic voltammetry, CD spectroscopy and viscosity methods, the results indicate the interaction modes between Mg(II)L and DNA are mainly with intercalation and involving some electrostatic interaction.
Collapse
Affiliation(s)
- Yan Zhang
- Department of Chemistry, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, P R China
| | | | | |
Collapse
|
30
|
Xu D, Wang X, Fei D, Ding L. Study on the interaction between the inclusion complex of hematoxylin with β-cyclodextrin and DNA. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2011; 29:854-66. [PMID: 21128172 DOI: 10.1080/15257770.2010.531858] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Ultraviolet-visible (UV-vis) spectra, fluorescence spectra, electrochemistry, and the thermodynamic method were used to discuss the interaction mode between the inclusion complex of hematoxylin with β-cyclodextrin and herring sperm DNA. On the condition of physiological pH, the result showed that hematoxylin and β-cyclodextrin formed an inclusion complex with binding ratio n(hematoxylin):n(β-cyclodextrin) = 1:1. The interaction mode between β-cyclodextrin-hematoxylin and DNA was a mixed binding, which contained intercalation and electrostatic mode. The binding ratio between β-cyclodextrin-hematoxylin and DNA was n(β-cyclodextrin -hematoxylin):n(DNA) = 2:1, binding constant was K(⊖)(298.15K) = 5.29 × 10⁴ L·mol⁻¹, and entropy worked as driven force in this action.
Collapse
Affiliation(s)
- Dongling Xu
- Department of Chemistry, Material Science and Engineering College, Southwest University of Science and Technology, Mianyang, Sichuan, P. R. China
| | | | | | | |
Collapse
|
31
|
Huang J, Wang X, Fei D, Ding L. Interactions of vitamin K3 with herring-sperm DNA using spectroscopy and electrochemistry. APPLIED SPECTROSCOPY 2010; 64:1126-1130. [PMID: 20925982 DOI: 10.1366/000370210792973488] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
By means of ultraviolet-visible (UV-Vis) and fluorescence spectra, the binding ratio between vitamin K(3) and herring-sperm DNA in a physiological pH environment (pH = 7.40) was determined as n(K3):n(DNA) = 2:1, and the binding constants of vitamin K(3) binding to DNA at different temperatures were determined as K(θ)(298K) = 1.28 × 10(5) L·mol(-1) and K(θ)(310K) = 7.19 × 10(4) L·mol(-1), which were confirmed using the double reciprocal method are Δ(r)H(m)(θ) = -3.57 × 10(4) J·mol(-1), Δ(r)G(m)(θ) = -2.92 × 10(4) J·mol(-1), and Δ(r)S(m)(θ) = 217.67 J·mol(-1)K(-1). The driving power of this process was enthalpy. An intercalation binding of the vitamin K(3) with DNA was supported by a competitive experiment using acridine orange (AO) as a spectral probe. By combination analysis of the Scatchard method and cyclic voltammetry, we suggested that the interaction mode between vitamin K(3) and herring-sperm DNA would be a mixed mode. The quinonoid, duality fused-ring of vitamin K(3) can intercalate into the base pairs of DNA, and there is an electrostatic binding along with intercalation binding.
Collapse
Affiliation(s)
- Jianhang Huang
- School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, China 621010
| | | | | | | |
Collapse
|
32
|
Zhao N, Wang X, Pan H, Hu Y, Ding L. Spectroscopic studies on the interaction between tryptophan-erbium(III) complex and herring sperm DNA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:1435-1442. [PMID: 20219421 DOI: 10.1016/j.saa.2010.01.013] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2009] [Revised: 12/20/2009] [Accepted: 01/29/2010] [Indexed: 05/28/2023]
Abstract
By means of UV and fluorescence spectra, the binding ratios between Er(III)-Trp and DNA in physiological pH environment (pH 7.40) were determined as n(Trp):n(Er(III))=3:1 and (n)ER(III)(Trp)(3):(n)(DNA) = 2:1, and the apparent molar absorptivity of epsilon(Er(III)-Trp-DNA) is 4.33 x 10(5) L mol(-1)cm(-1) which was confirmed by molar ratio method. The binding constants at different temperatures K(B25 degrees C)(theta)=1.93 x 10(4)L mol(-1) and K(B37 degrees C)(theta)=5.28 x 10(3)L mol(-1) were obtained by double reciprocal method. Thermodynamic function computation demonstrates that Delta(r)H(m)(theta) is the primary driving power of the interaction between Er(III)(Trp)(3) and DNA. By combination analysis of the Scatchard method and CD spectrometry, we suggested that the interaction mode between Er(III)(Trp)(3) complex and herring sperm DNA is groove and intercalation bindings.
Collapse
Affiliation(s)
- Na Zhao
- Department of Chemistry, Material Science and Engineering College, Southwest University of Science and Technology, No. 59, Qinglong Road, Mianyang 621010, China
| | | | | | | | | |
Collapse
|
33
|
Interaction between tryptophan-vanillin Schiff base and herring sperm DNA. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2010. [DOI: 10.2298/jsc100128107z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The interaction of the Schiff base (K[HL]) with herring sperm DNA was studied by UV-vis absorption, fluorescence and viscosity methods in a physiological pH environment (pH 7.40), where the Schiff base was derived from vanillin and L-tryptophan. A binding ratio of nK[HL]:nDNA = 5:1 and an apparent molar absorption coefficient of ?K[HL]-DNA = 4.98 ? 105 L?mol-1?cm-1 were confirmed by the mole ratio method. The binding constants of KB ? 28?C = 1.94 ? 105 L?mol-1 and KB ? 37?C = 1.09 ? 105 L?mol-1 were obtained by the double reciprocal method. Thermodynamic parameters suggest that the interaction between K[HL] and DNA is driven mainly by enthalpy. Combined with Scatchard methods and viscosity methods, the results indicate the presence of intercalation and groove binding between K[HL] and DNA.
Collapse
|
34
|
Benati FJ, Lauretti F, Faccin LC, Nodari B, Ferri DV, Mantovani MS, Linhares REC, Nozawa C. Effects of chlorophyllin on replication of poliovirus and bovine herpesvirus in vitro. Lett Appl Microbiol 2009; 49:791-5. [PMID: 19843214 DOI: 10.1111/j.1472-765x.2009.02744.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
AIMS Chlorophyllin (CHLN), a synthetic derivative of chlorophyll, was assayed in the replication of poliovirus (PV-1) and bovine herpesvirus (BoHV-1) in HEp-2 cell cultures. METHODS AND RESULTS Virucidal activity of CHLN was evaluated and the time-of-addition assay was performed as follows: before the infection (-1 and -2 h), at the time of the infection (0 h) and after the infection (1 and 2 h). Plaque reduction assay (PRA) showed that CHLN inhibited BoHV-1 and PV-1 infection and the 50% inhibitory concentrations (IC(50)) against BoHV-1 and PV-1 infection were 8.6 and 19.8 microg ml(-1), respectively. The time-of-addition study demonstrated that the CHLN was effective inhibiting viral replication in 51% and 66.5% for PV-1 and BoHV-1, respectively, at the highest concentration of 20.0 microg ml(-1), when added during the infection. The directed effect of CHLN on viral strains demonstrated an inhibition of 62% and 66.4% for PV-1 and BoHV-1, respectively, by PRA. CONCLUSIONS These results demonstrated that CHLN could be used as an antiviral suggesting directed activity on virus particles and on virus-receptor sites to BoHV. For poliovirus, CHLN also demonstrated virucide activity, moreover, showed to inhibit early steps of the replication cycle. SIGNIFICANCE AND IMPACT OF THE STUDY CHLN demonstrated promising selectivity index for both virus strains; therefore, it can be used for the development of an antiviral agent.
Collapse
Affiliation(s)
- F J Benati
- Departamento de Microbiologia, Centro de Ciências Biológicas, Universidade Estadual de Londrina, CEP, Brasil
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Chimploy K, Díaz GD, Li Q, Carter O, Dashwood WM, Mathews CK, Williams DE, Bailey GS, Dashwood RH. E2F4 and ribonucleotide reductase mediate S-phase arrest in colon cancer cells treated with chlorophyllin. Int J Cancer 2009; 125:2086-94. [PMID: 19585502 DOI: 10.1002/ijc.24559] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Chlorophyllin (CHL) is a water-soluble derivative of chlorophyll that exhibits cancer chemopreventive properties, but which also has been studied for its possible cancer therapeutic effects. We report here that human colon cancer cells treated with CHL accumulate in S-phase of the cell cycle, and this is associated with reduced expression levels of p53, p21, and other G(1)/S checkpoint controls. At the same time, E2F1 and E2F4 transcription factors become elevated and exhibit increased DNA binding activity. In CHL-treated colon cancer cells, bromodeoxyuridine pulse-chase experiments provided evidence for the inhibition of DNA synthesis. Ribonucleotide reductase (RR), a pivotal enzyme for DNA synthesis and repair, was reduced at the mRNA and protein level after CHL treatment, and the enzymatic activity was inhibited in a concentration-dependent manner both in vitro and in vivo. Immunoblotting revealed that expression levels of RR subunits R1, R2, and p53R2 were reduced by CHL treatment in HCT116 (p53(+/+)) and HCT116 (p53(-/-)) cells, supporting a p53-independent mechanism. Prior studies have shown that reduced levels of RR small subunits can increase the sensitivity of colon cancer cells to clinically used DNA-damaging agents and RR inhibitors. We conclude that by inhibiting R1, R2, and p53R2, CHL has the potential to be effective in the clinical setting, when used alone or in combination with currently available cancer therapeutic agents.
Collapse
Affiliation(s)
- Korakod Chimploy
- Linus Pauling Institute, Oregon State University, Corvallis, OR 97331-6512, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Li J, Liu X, Ren C, Li J, Sheng F, Hu Z. In vitro study on the interaction between thiophanate methyl and human serum albumin. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2009; 94:158-63. [DOI: 10.1016/j.jphotobiol.2008.10.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Revised: 09/26/2008] [Accepted: 10/12/2008] [Indexed: 10/21/2022]
|
37
|
Liu YC, Yang ZY, Du J, Yao XJ, Lei RX, Zheng XD, Liu JN, Hu HS, Li H. Study on the interactions of kaempferol and quercetin with intravenous immunoglobulin by fluorescence quenching, fourier transformation infrared spectroscopy and circular dichroism spectroscopy. Chem Pharm Bull (Tokyo) 2008; 56:443-451. [PMID: 18379088 DOI: 10.1248/cpb.56.443] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2023]
Abstract
The interactions of kaempferol and quercetin with intravenous immunoglobulin (IVIG) were studied in vitro by spectroscopic methods including fluorescence spectra, Fourier transformation infrared (FT-IR) spectra and circular dichroism (CD) spectra. The binding parameters for the reactions calculated according to the Sips equation suggested that the bindings of IVIG to kaempferol and quercetin were characterized by two binding sites with the average affinity constants K(o) at 1.032 x 10(4) M(-1) and 1.849 x 10(4) M(-1), respectively. The binding of IVIG with quercetin is stronger than that of IVIG with kaempferol. They were of non-specific and weak drug-protein interactions. Docking was used to calculate the interaction modes between kaempferol and quercetin with IVIG. The secondary structural compositions of free IVIG and its kaempferol, quercetin complexes were calculated by the FT-IR difference spectra, self-deconvolution, second derivative resolution enhancement and the curve-fitting procedures of amide I band respectively, which are in good agreement with the analyses of CD spectra. The effect of 3'-OH substituent in quercetin is distinct between the interactions of IVIG with kaempferol and quercetin for the secondary structure of the protein. The observed spectral changes indicate a partial unfolding of the protein structure, but the typical beta structural conformation of IVIG is still retentive in the presence of both drugs in aqueous solution. The average binding distances between the chromophores of IVIG with kaempferol (4.30 nm) and quercetin (4.35 nm) were obtained on the basis of the theory of Förster energy transfer. IVIG can serve as transport protein (carrier) for kaempferol and quercetin.
Collapse
Affiliation(s)
- Yong-Chun Liu
- College of Chemistry and Chemical Engineering, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, PR China
| | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Studies on the interaction of caffeic acid with human serum albumin in membrane mimetic environments. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2008; 90:141-51. [DOI: 10.1016/j.jphotobiol.2007.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2007] [Revised: 11/27/2007] [Accepted: 12/18/2007] [Indexed: 12/11/2022]
|
39
|
|
40
|
Interaction of Taxol with intravenous immunoglobulin: An inhibition of Taxol from crystallizing in aqueous solution. Int Immunopharmacol 2008; 8:390-400. [PMID: 18279793 DOI: 10.1016/j.intimp.2007.10.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Revised: 10/15/2007] [Accepted: 10/30/2007] [Indexed: 11/22/2022]
|
41
|
Neault JF, Diamantoglou S, Beauregard M, Nafisi S, Tajmir-Riahi HA. Protein unfolding in drug-RNase complexes. J Biomol Struct Dyn 2007; 25:387-94. [PMID: 18092833 DOI: 10.1080/07391102.2008.10507187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Bovine pancreatic ribonuclease A (RNase A) catalyzes the cleavage of P-O5' bonds in RNA on the 3' side of pyrimidine to form cyclic 2', 5'-phosphates. It has several high affinity binding sites that make it possible target for many organic and inorganic molecules. Ligand binding to RNase A can alter protein secondary structure and its catalytic activity. In this review, the effects of several drugs such as AZT (anti-AIDS), cis-Pt (antitumor), aspirin (anti-inflammatory), and vitamin C (antioxidant) on the stability and conformation of RNase A in vitro are compared. The results of UV-visible, FTIR, and CD spectroscopic analysis of RNase complexes with aspirin, AZT, cis-Pt, and vitamin C at physiological conditions are discussed here. Spectroscopic results showed one major binding for each drug-RNase adduct with KAZT=5.29 (+/-1.6)x10(4) M(-1), Kaspirin=3.57 (+/-1.4)x10(4) M(-1), Kcis-Pt=5.66 (+/-1.9)x10(3) M(-1), and Kascorbate=3.50 (+/-1.5)x10(3) M(-1). Major protein unfolding occurred with reduction of alpha-helix from 29% (free protein) to 20% and increase of beta-sheet from 39% (free protein) to 45% in the aspirin-, ascorbate-, and cis-Pt-RNase complexes, while minor increase of alpha-helix was observed for AZT-RNase adduct.
Collapse
Affiliation(s)
- J F Neault
- Department of Chemistry-Biology, University of Québec at Trois-Rivières, Canada G9A 5H7
| | | | | | | | | |
Collapse
|
42
|
Study of the effect of Cal-Red on the secondary structure of human serum albumin by spectroscopic techniques. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2007.01.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
43
|
Thongsook T, Whitaker JR, Smith GM, Barrett DM. Reactivation of broccoli peroxidases: structural changes of partially denatured isoenzymes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:1009-18. [PMID: 17263506 DOI: 10.1021/jf062242+] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
UNLABELLED Structural changes involved in the reactivation of peroxidases (PODs) from broccoli and horseradish (HRP) following heat denaturation were investigated by using circular dichroism and absorption spectroscopy. Cooling heat-treated enzymes resulted in rapid refolding of the secondary structure into an inactive structural species, similar in conformation to the native enzyme. Reassociation of heme to the refolded peroxidase, as well as molecular rearrangement of the structure around the heme, occurs during incubation at approximately 25 degrees C and results in the return of biological activity. The secondary structure of neutral broccoli POD (N) is relatively heat labile, resulting in a rapid loss of activity, but the level of reactivation is high because the structure at the heme pocket is relatively stable. Acidic broccoli POD and HRP are more heat stable than N, but have a low degree of reactivation. Loss of activity is due primarily to alteration of the structure at the heme pocket. Effects of bovine serum albumin and pH on reactivation of PODs are also discussed. KEYWORDS Peroxidase; reactivation; horseradish; broccoli; circular dichroism; absorption spectroscopy.
Collapse
Affiliation(s)
- Tipawan Thongsook
- Department of Agro-Industry, Faculty of Agriculture Natural Resources and Environment, Naresuan University, Phitsanulok 65000, Thailand
| | | | | | | |
Collapse
|
44
|
Stability and structural features of DNA intercalation with ethidium bromide, acridine orange and methylene blue. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.05.004] [Citation(s) in RCA: 324] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
45
|
Li Y, Yao X, Jin J, Chen X, Hu Z. Interaction of rhein with human serum albumin investigation by optical spectroscopic technique and modeling studies. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2007; 1774:51-8. [PMID: 17174615 DOI: 10.1016/j.bbapap.2006.09.020] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Revised: 09/03/2006] [Accepted: 09/28/2006] [Indexed: 01/26/2023]
Abstract
The binding of rhein with human serum albumin (HSA) has been studied in detail by spectroscopic method including circular dichroism (CD), Fourier transformation infrared spectra (FT-IR), fluorescence spectra. The binding parameters for the reaction have been calculated according to Scatchard equation at different temperatures. The plots indicated that the binding of HSA to rhein at 303, 310 and 318 K is characterized by one binding site with the affinity constant K at (4.93+/-0.16)x10(5), (4.02+/-0.16)x10(5) and (2.69+/-0.16)x10(5) M-1, respectively. The secondary structure compositions of free HSA and its rhein complexes were estimated by the FT-IR spectra. FT-IR and curve-fitted results of amide I band are in good agreement with the analyses of CD spectra. Molecular Modeling method was used to calculate the interaction modes between the drug and HSA.
Collapse
Affiliation(s)
- Ying Li
- Department of chemistry, LanZhou University, LanZhou 730000, China
| | | | | | | | | |
Collapse
|
46
|
Kanakis C, Tarantilis P, Polissiou M, Diamantoglou S, Tajmir-Riahi H. Antioxidant flavonoids bind human serum albumin. J Mol Struct 2006. [DOI: 10.1016/j.molstruc.2006.03.051] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
47
|
Andrushchenko VV, Vogel HJ, Prenner EJ. Solvent-dependent structure of two tryptophan-rich antimicrobial peptides and their analogs studied by FTIR and CD spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2006; 1758:1596-608. [PMID: 16956577 DOI: 10.1016/j.bbamem.2006.07.013] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2005] [Revised: 06/29/2006] [Accepted: 07/28/2006] [Indexed: 10/24/2022]
Abstract
Structural changes for a series of antimicrobial peptides in various solvents were investigated by a combined approach of FTIR and CD spectroscopy. The well-characterized and potent antimicrobial peptides indolicidin and tritrpticin were studied along with several analogs of tritrpticin, including Tritrp1 (amidated analog of tritrpticin), Tritrp2 (analog of Tritrp1 with Arg-->Lys substitutions), Tritrp3 (analog of Tritrp1 with Pro-->Ala substitutions) and Tritrp4 (analog of Tritrp1 with Trp-->Tyr substitutions). All peptides were studied in aqueous buffer, ethanol and in the presence of dodecylphosphocholine (DPC) micelles. It was shown that tritrpticin and its analogs preferentially adopt turn structures in all solvents studied. The turn structures formed by the tritrpticin analogs bound to DPC micelles are more compact and more conformationally restricted compared to indolicidin. While several peptides showed a slight propensity for an alpha-helical conformation in ethanol, this trend was only strong for Tritrp3, which also adopted a largely alpha-helical structure with DPC micelles. Tritrp3 also demonstrated along with Tritrp1 the highest ability to interact with DPC micelles, while Tritrp2 and Tritrp4 showed the weakest interaction.
Collapse
Affiliation(s)
- Valery V Andrushchenko
- Department of Biological Sciences, University of Calgary, 2500 University Dr, NW, Calgary, Alberta, Canada T2N 1N4
| | | | | |
Collapse
|
48
|
Li MJ, Lin SY. Vibrational Spectroscopic Studies on the Disulfide Formation and Secondary Conformational Changes of Captopril–HSA Mixture after UV-B Irradiation. Photochem Photobiol 2005; 81:1404-10. [PMID: 16354113 DOI: 10.1562/2005-04-25-rn-497] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The effects of pH and ultraviolet-B (UV-B) irradiation on the secondary structure of human serum albumin (HSA) in the absence or presence of captopril were investigated by an attenuated total reflection (ATR)/Fourier transform infrared (FTIR) spectroscopy. The UV-B exposure affecting the stability of captopril before and after captopril-HSA interaction was also examined by using confocal Raman microspectroscopy. The results indicate that the transparent pale-yellow solution for captopril-HSA mixture in all pH buffer solutions, except pH 5.0 approximately 7.0, changed into a viscous form then a gel form with UV-B exposure time. The secondary structural transformation of HSA in the captopril-HSA mixture with or without UV-B irradiation was found to shift the maxima amide I peak in IR spectra from 1652 cm(-1) assigned to alpha-helix structure to 1622 cm(-1) because of a beta-sheet structure, which was more evident in pH 3.0, 8.0 or 9.0 buffer solutions. The Raman shift from 1653 cm(-1) (alpha-helix) to 1670 cm(-1) (beta-sheet) also confirmed this result. Captopril dissolved in distilled water with or without UV-B irradiation was determined to form a captopril disulfide observed from the Raman spectra of 512 cm(-1), which was exacerbated by UV-B irradiation. There was little disulfide formation in the captopril-HSA mixture even with long-term UV-B exposure, but captopril might interact with HSA to change the protein secondary structure of HSA whether there was UV-B irradiation or not. The pH of the buffer solution and captopril-HSA interaction may play more important roles in transforming the secondary structure of HSA from alpha-helix to beta-sheet in the corresponding captopril-HSA mixture than UV-B exposure. The present study also implies that HSA has the capability to protect the instability of captopril in the course of UV-B irradiation. In addition, a partial unfolding of HSA induced by pH or captopril-HSA interaction under UV-B exposure is proposed.
Collapse
Affiliation(s)
- Mei-Jane Li
- Biopharmaceutics Laboratory, Department of Medical Research and Education, Taipei Veterans General Hospital, Shih-Pai, Taipei, Taiwan, Republic of China
| | | |
Collapse
|
49
|
Ragi C, Sedaghat-Herati MR, Ouameur AA, Tajmir-Riahi HA. The effects of poly(ethylene glycol) on the solution structure of human serum albumin. Biopolymers 2005; 78:231-6. [PMID: 15832324 DOI: 10.1002/bip.20281] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Protein physical and chemical properties can be altered by polymer interaction. The presence of several high affinity binding sites on human serum albumin (HSA) makes it a possible target for many organic and polymer molecules. This study was designed to examine the interaction of HSA with poly(ethylene glycol) (PEG) in aqueous solution at physiological conditions. Fourier transform infrared, ultraviolet-visible, and CD spectroscopic methods were used to determine the polymer binding mode, the binding constant, and the effects of polymer complexation on protein secondary structure. The spectroscopic results showed that PEG is located along the polypeptide chains through H-bonding interactions with an overall affinity constant of K = 4.12 x 10(5) M(-1). The protein secondary structure showed no alterations at low PEG concentration (0.1 mM), whereas at high polymer content (1 mM), a reduction of alpha-helix from 59 (free HSA) to 53% and an increase of beta-turn from 11 (free HSA) to 22% occurred in the PEG-HSA complexes (infrared data). The CDSSTR program (CD data) also showed no major alterations of the protein secondary structure at low PEG concentrations (0.1 and 0.5 mM), while at high polymer content (1 mM), a major reduction of alpha-helix from 69 (free HSA) to 58% and an increase of beta-turn from 7 (free HSA) to 18% was observed.
Collapse
Affiliation(s)
- C Ragi
- Department of Chemistry-Biology, University of Québec at Trois-Riviéres, C. P. 500, TR (Québec) Canada G9A 5H7
| | | | | | | |
Collapse
|