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Kesebir AÖ, Güller P, Kalın R, Özdemir H, Küfrevioğlu Öİ. Methyl benzoate derivatives as inhibitors of pentose phosphate pathway, which promotes cancer progression and drug resistance: An In Silico study supported By In Vitro results. Biotechnol Appl Biochem 2022; 69:1275-1283. [DOI: 10.1002/bab.2322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 01/18/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Arzu Öztürk Kesebir
- Department of Chemistry, Faculty of Science Atatürk University Erzurum 25240 Turkey
| | - Pınar Güller
- Department of Chemistry, Faculty of Science Atatürk University Erzurum 25240 Turkey
| | - Ramazan Kalın
- Department of Basic Science, Faculty of Science Erzurum Technical University Erzurum 25700 Turkey
| | - Hasan Özdemir
- Department of Chemistry, Faculty of Science Atatürk University Erzurum 25240 Turkey
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2
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Jakkula P, Narsimulu B, Qureshi IA. Biochemical and structural insights into 6-phosphogluconate dehydrogenase from Leishmania donovani. Appl Microbiol Biotechnol 2021; 105:5471-5489. [PMID: 34250571 DOI: 10.1007/s00253-021-11434-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/19/2021] [Accepted: 06/13/2021] [Indexed: 11/29/2022]
Abstract
6-phosphogluconate dehydrogenase (6PGDH) participates in pentose phosphate pathway of glucose metabolism by catalyzing oxidative decarboxylation of 6-phsophogluconate (6PG) and its absence has been lethal for several eukaryotes. Despite being a validated drug target in many organisms like Plasmodium, the enzyme has not been explored in leishmanial parasites. In the present study, 6PGDH of Leishmania donovani (Ld6PGDH) is cloned and purified followed by its characterization using biochemical and structural approaches. Ld6PGDH lacks the glycine-serine-rich sequence at its C-terminal that is present in other eukaryotes including humans. Leishmanial 6PGDH possesses more affinity for substrate (6PG) and cofactor (NADP) in comparison to that of human. The enzymatic activity is inhibited by gentamicin and cefuroxime through competitive mode with functioning more potently towards leishmanial 6PGDH than its human counterpart. CD analysis has shown higher α-helical content in the secondary structure of Ld6PGDH, while fluorescence studies revealed that tryptophan residues are not completely accessible to solvent environment. The three-dimensional structure was generated through homology modelling and docked with substrate and cofactor. The docking studies demonstrated two separate binding pockets for 6PG and NADP with higher affinity for the cofactor binding, and Asn105 is interacting with substrate as well as the cofactor. Additionally, MD simulation has shown complexes of Ld6PGDH with 6PG and NADP to be more stable than its apo form. Altogether, the present study might provide the foundation to investigate this enzyme as potential target against leishmaniasis. KEY POINTS: • Ld6PGDH enzymatic activity is competitively inhibited by gentamicin and cefuroxime. • It displays more helical contents and all structural characteristics of 6PGDH family. • Interaction studies demonstrate higher affinity of cofactor than substrate for Ld6PGDH.
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Affiliation(s)
- Pranay Jakkula
- Department of Biotechnology & Bioinformatics, School of Life Sciences, University of Hyderabad, Prof. C.R. Rao Road, Hyderabad, 500046, India
| | - Bandigi Narsimulu
- Department of Biotechnology & Bioinformatics, School of Life Sciences, University of Hyderabad, Prof. C.R. Rao Road, Hyderabad, 500046, India
| | - Insaf Ahmed Qureshi
- Department of Biotechnology & Bioinformatics, School of Life Sciences, University of Hyderabad, Prof. C.R. Rao Road, Hyderabad, 500046, India.
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3
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Çalışkan B, Öztürk Kesebir A, Demir Y, Akyol Salman İ. The effect of brimonidine and proparacaine on metabolic enzymes: Glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, and glutathione reductase. Biotechnol Appl Biochem 2021; 69:281-288. [PMID: 33438819 DOI: 10.1002/bab.2107] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 01/06/2021] [Indexed: 12/17/2022]
Abstract
Oxidative stress is to upregulate the pentose phosphate pathway (PPP). The PPP consists of two functional branches, glucose-6-phosphate dehydrogenase (G6PD) and 6-phosphogluconaste dehydrogenase (6PGD). Glutathione reductase (GR) has a significant role in catalyzing an oxidized glutathione form into a reduced form. The purpose of this study is to investigate the effects of brimonidine and proparacaine on the activity of 6PGD, G6PD, and GR enzymes purified from human erythrocytes. Brimonidine displayed considerable inhibition profile against G6PD with IC50 value and KI constant of 29.93 ± 3.56 and 48.46 ± 0.66 μM, respectively. On the other hand, proparacaine had no inhibitory effect against G6PD. KI values were found to be 66.06 ± 0.78 and 811.50 ± 11.13 μM for brimonidine and proparacaine, respectively, for 6PGD. KI values were found to be 144.10 ± 2.01 and 1,654.00 ± 26.29 μM for brimonidine and proparacaine, respectively, for GR. Herein, also in silico molecular docking studies were performed between drugs and enzymes.
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Affiliation(s)
- Büşra Çalışkan
- Department of Ophthalmology, Faculty of Medicine, Atatürk University, Erzurum, Turkey
| | - Arzu Öztürk Kesebir
- Department of Chemistry, Faculty of Science, Atatürk University, Erzurum, Turkey
| | - Yeliz Demir
- Department of Pharmacy Services, Nihat Delibalta Göle Vocational High School, Ardahan University, Ardahan, Turkey
| | - İlknur Akyol Salman
- Department of Ophthalmology, Faculty of Medicine, Atatürk University, Erzurum, Turkey
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4
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Wang K, Romm EL, Kouznetsova VL, Tsigelny IF. Prediction of Premature Termination Codon Suppressing Compounds for Treatment of Duchenne Muscular Dystrophy Using Machine Learning. Molecules 2020; 25:molecules25173886. [PMID: 32858918 PMCID: PMC7503396 DOI: 10.3390/molecules25173886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Revised: 08/14/2020] [Accepted: 08/20/2020] [Indexed: 11/16/2022] Open
Abstract
A significant percentage of Duchenne muscular dystrophy (DMD) cases are caused by premature termination codon (PTC) mutations in the dystrophin gene, leading to the production of a truncated, non-functional dystrophin polypeptide. PTC-suppressing compounds (PTCSC) have been developed in order to restore protein translation by allowing the incorporation of an amino acid in place of a stop codon. However, limitations exist in terms of efficacy and toxicity. To identify new compounds that have PTC-suppressing ability, we selected and clustered existing PTCSC, allowing for the construction of a common pharmacophore model. Machine learning (ML) and deep learning (DL) models were developed for prediction of new PTCSC based on known compounds. We conducted a search of the NCI compounds database using the pharmacophore-based model and a search of the DrugBank database using pharmacophore-based, ML and DL models. Sixteen drug compounds were selected as a consensus of pharmacophore-based, ML, and DL searches. Our results suggest notable correspondence of the pharmacophore-based, ML, and DL models in prediction of new PTC-suppressing compounds.
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Affiliation(s)
- Kate Wang
- MAP program, University of California San Diego (UCSD), La Jolla, CA 92093, USA;
| | - Eden L. Romm
- Curematch Inc., 6440 Lusk Blvd, Suite D206, San Diego, CA 92121, USA;
| | - Valentina L. Kouznetsova
- San Diego Supercomputer Center, University of California San Diego (UCSD), La Jolla, CA 92093, USA;
| | - Igor F. Tsigelny
- Curematch Inc., 6440 Lusk Blvd, Suite D206, San Diego, CA 92121, USA;
- San Diego Supercomputer Center, University of California San Diego (UCSD), La Jolla, CA 92093, USA;
- Dept. of Neurosciences, University of California San Diego (UCSD), La Jolla, CA 92093, USA
- Correspondence:
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5
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Özaslan MS, Balcı N, Demir Y, Gürbüz M, Küfrevioğlu Öİ. Inhibition effects of some antidepressant drugs on pentose phosphate pathway enzymes. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2019; 72:103244. [PMID: 31557707 DOI: 10.1016/j.etap.2019.103244] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 08/09/2019] [Accepted: 08/15/2019] [Indexed: 06/10/2023]
Abstract
The glucose metabolism in the pentose cycle is essential to the source of NADPH. Deficiency of these enzymes have been linked to depression and psychotic disorders. Depression is an increasingly prevalent mental disorder which may cause loss of labor. Antidepressant drugs are commonly employed in treatments of mood disorders and anxiety treatment. The purpose of this study is to investigate the effects of aripiprazole, mirtazapine, risperidone, escitalopram and haloperidol on the activity of 6-phosphogluconate dehydrogenase (6PGD) and glucose-6-phosphate dehydrogenase (G6PD) enzymes purified from human erythrocytes. It was found that aripiprazole, mirtazapine, risperidone, escitalopram and haloperidol show effective inhibitor properties on purified G6PD and 6PGD enzymes. The IC50 values of these drugs were found in the range of 26.34 μM-5.78 mM for 6PGD and 16.26 μM-3.85 mM for G6PD. The Ki values of the drugs were found in the range of 30.21 ± 4.31 μM-4.51 ± 1.83 mM for 6PGD and 14.12 ± 3.48 μM-4.98 ± 1.14 mM for G6PD. Usage of drugs with significant biological effects may be a hazard in some conditions.
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Affiliation(s)
- Muhammet Serhat Özaslan
- Department of Pharmacy Services, Nihat Delibalta Göle Vocational High School, Ardahan University, 75700, Ardahan, Turkey
| | - Neslihan Balcı
- Department of Chemistry, Faculty of Science, Atatürk University, 25240, Erzurum, Turkey
| | - Yeliz Demir
- Department of Pharmacy Services, Nihat Delibalta Göle Vocational High School, Ardahan University, 75700, Ardahan, Turkey.
| | - Mahmut Gürbüz
- Gaziantep Islahiye State Hospital, 27800, Gaziantep, Turkey
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6
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Türkan F, Huyut Z, Basbugan Y, Gülçin İ. Influence of some β-lactam drugs on selected antioxidant enzyme and lipid peroxidation levels in different rat tissues. Drug Chem Toxicol 2019; 43:27-36. [PMID: 31060396 DOI: 10.1080/01480545.2019.1608230] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Antioxidant enzymes play an important role in body defense and free radical removal. Cephalosporins are β-lactam antibiotics. In this work, the effects of cefazolin, cefuroxime and cefoperazone which are cephalosporins on some selected antioxidant enzyme and levels of malondialdehyde (MDA) as lipid peroxidation product were investigated in kidney, liver, and brain tissues of albino female rats. Ninety-six albino rats were randomly divided into 16 groups of equal number (n = 6). 50 mg/kg cefazolin, 25 mg/kg cefuroxime, and 100 mg/kg cefoperazone were injected intraperitoneally to the groups (5th-8th and 9th-12th, and 13th-16th groups), respectively. The changes in glutathione reductase (GR), glutathione S-transferase (GST), superoxide dismutase (SOD), peroxidase (POD), and glutathione peroxidase (GSH-Px) levels were studied in each time point group and a time-dependent manner (at the 1st, 3rd, 5th and 7th hour). In addition, MDA levels were examined in all the tissues. The drugs evaluated in this study had different effects on the same enzyme in different tissues depending on time. MDA levels especially in cefazolin and cefoperazone experiments were lower in all the tissues; however, MDA levels were higher in brain and kidney tissues in the cefuroxime groups in a time-dependent manner (p < 0.05). These results revealed the complex effects of the tested drugs on different tissues at different time points. Therefore, the dose and use of these drugs should be adjusted correctly.
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Affiliation(s)
- Fikret Türkan
- Health Services Vocational School, Igdır University, Igdır, Turkey
| | - Zübeyir Huyut
- Department of Biochemistry, Medical Faculty, Van Yuzuncu Yıl University, Van, Turkey
| | - Yıldıray Basbugan
- Department of Internal Diseases, Faculty of Veterinary Medicine, University of Van Yuzuncu Yıl, Van, Turkey
| | - İlhami Gülçin
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, Turkey
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7
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Türkan F, Huyut Z, Taslimi P, Huyut MT, Gülçin İ. Investigation of the effects of cephalosporin antibiotics on glutathione S-transferase activity in different tissues of rats in vivo conditions in order to drug development research. Drug Chem Toxicol 2018; 43:423-428. [DOI: 10.1080/01480545.2018.1497644] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Fikret Türkan
- Health Services Vocational School, Igdır University, Igdır, Turkey
| | - Zübeyir Huyut
- Department of Biochemistry, Medical Faculty, Yuzuncu Yıl University, Van Turkey
| | - Parham Taslimi
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, Turkey
| | - Mehmet Tahir Huyut
- Department of Bioistatistics, Medical Faculty, Yuzuncu Yıl University, Van, Turkey
| | - İlhami Gülçin
- Department of Chemistry, Faculty of Sciences, Atatürk University, Erzurum, Turkey
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8
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Qin P, Pan X, Liu R, Qiu J, Fang X. Experimental and computational characterization on the binding of two fluoroquinolones to bovine hemoglobin. J Mol Recognit 2017; 30. [DOI: 10.1002/jmr.2647] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 05/17/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Pengfei Qin
- College of Resources and Environment, Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection; Linyi University; Linyi China
| | - Xingren Pan
- School of Physics and Electronic Engineering; Linyi University; Linyi China
| | - Rutao Liu
- School of Environmental Science and Engineering; Shandong University; Jinan China
| | - Jicai Qiu
- College of Resources and Environment, Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection; Linyi University; Linyi China
| | - Xiaoyan Fang
- Linyi Agricultural Environmental Protection and Monitoring Station; Linyi China
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9
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Adem S, Ciftci M. Purification and biochemical characterization of glucose 6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase and glutathione reductase from rat lung and inhibition effects of some antibiotics. J Enzyme Inhib Med Chem 2016; 31:1342-8. [PMID: 26758606 DOI: 10.3109/14756366.2015.1132711] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
G6PD, 6PGD and GR have been purified separately in the single step from rat lung using 2', 5'-ADP Sepharose 4B affinity chromatography. The purified enzymes showed a single band on sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The molecular weights of the enzymes were estimated to be 134 kDa for G6PD, 107 kDa for 6PGD and 121 kDa for GR by Sephadex G-150 gel filtration chromatography, and the subunit molecular weights was respectively found to be 66, 52 and 63 kDa by SDS-PAGE. Optimum pH, stable pH, optimum ionic strength, optimum temperature, KM and Vmax values for substrates were determined. Product inhibition studies were also performed. The enzymes were inhibited by levofloxacin, furosemide, ceftazidime, cefuroxime and gentamicin as in vitro with IC50 values in the range of 0.07-30.13 mM. In vivo studies demonstrated that lung GR was inhibited by furosemide and lung 6PGD was inhibited by levofloxacin.
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Affiliation(s)
- Sevki Adem
- a Department of Chemistry , Faculty of Science, Cankiri Karatekin University , Cankiri , Turkey and
| | - Mehmet Ciftci
- b Department of Chemistry , Faculty of Art and Science, Bingol University , Bingol , Turkey
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10
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Aslan E, Adem S. Investigation of the Effects of Some Drugs and Phenolic Compounds on Human Dihydrofolate Reductase Activity. J Biochem Mol Toxicol 2014; 29:135-9. [DOI: 10.1002/jbt.21677] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 09/23/2014] [Accepted: 10/08/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Erdem Aslan
- Chemistry Department; Faculty of Science; Cankiri Karatekin University; Cankiri Turkey
| | - Sevki Adem
- Chemistry Department; Faculty of Science; Cankiri Karatekin University; Cankiri Turkey
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Adem S, Comakli V, Kuzu M, Demirdag R. Investigation of the effects of some phenolic compounds on the activities of glucose-6-phosphate dehydrogenase and 6-phosphogluconate dehydrogenase from human erythrocytes. J Biochem Mol Toxicol 2014; 28:510-4. [PMID: 25130191 DOI: 10.1002/jbt.21592] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 06/18/2014] [Indexed: 01/10/2023]
Abstract
Polyphenols are the important compounds that have various bioactivities. They constitute vital active agents of not only daily diet but also natural medicines that are used traditionally. It is generally considered that they are safe because they are natural. In some conducted studies, different negative effects of these compounds were mentioned. Twelve phenolic compounds have been assayed to determine the effect of inhibition on glucose-6-phosphate dehydrogenase (G6PD) and 6-phosphogluconate dehydrogenase (6PGD) enzymes activity. For in vitro studies, the enzymes were purified from human erythrocytes using 2',5'-ADP Sepharose 4B affinity chromatography. Naringenin, caffeic acid, ellagic acid, ferulic acid, and sinapic acid against two enzymes, hesperidin and polydatin, only on G6PD activity and chrysin solely against 6PGD showed inhibitory effect. Chlorogenic acid, p-coumaric acid, and syringic acid did not exhibit an effect on the activity of the two enzymes.
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Affiliation(s)
- Sevki Adem
- Cankırı Karatekın Unıversıty, Faculty of Science, Chemistry Department, Cankiri, Turkey.
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12
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Comakli V, Akkemik E, Ciftci M, Kufrevioglu OI. Purification and characterization of glucose 6-phosphate dehydrogenase enzyme from rainbow trout (Oncorhynchus mykiss) liver and investigation of the effects of some metal ions on enzyme activity. Toxicol Ind Health 2013; 31:403-11. [DOI: 10.1177/0748233713475514] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Glucose 6-phosphate dehydrogenase (d-glucose 6-phosphate: NADP+ oxidoreductase, EC 1.1.1.49; G6PD) is a key enzyme that is localized in all mammal tissues, especially in cytoplasmic sections and that catalyzes the first step of pentose phosphate metabolic pathway. In this study, G6PD enzyme was purified 1444-fold with a yield of 77% from rainbow trout liver using 2′,5′-ADP-sepharose-4B affinity chromatography. Moreover, a purity check of the enzyme was performed with sodium dodecyl sulfate–polyacrylamide gel electrophoresis. Some characteristic features like optimal pH, stable pH, optimal temperature and optimal ionic strength were determined for the purified enzyme. In addition to this, in vitro effects of ions like silver nitrate (Ag+), thallium sulphate (TI+), cobalt (II) nitrate (Co2+) and arsenic (V) oxide (As5+) on enzyme activity were researched. Half-maximal inhibitory concentration (IC50) values of Ag+, Co2+ and As5+ metal ions, which showed an inhibitory effect, were found to be 0.0044, 0.084 and 4.058 mM, respectively; and their inhibition constants ( Ki) were found to be 0.0052 ± 0.00042, 0.087 ± 0.015700 and 4.833 ± 1.753207 mM, respectively. Tl+ not exhibited inhibitory effect on the enzyme activity.
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Affiliation(s)
- Veysel Comakli
- Agri Ibrahim Cecen University, Health Services Vocational School, Agri, Turkey
| | - Ebru Akkemik
- Department of Chemistry, Faculty of Science, Ataturk University, Erzurum, Turkey
| | - Mehmet Ciftci
- Department of Chemistry, Faculty of Science, Ataturk University, Erzurum, Turkey
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13
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Akkemik E, Budak H, Ciftci M. Effects of some drugs on human erythrocyte glucose 6-phosphate dehydrogenase: an in vitro study. J Enzyme Inhib Med Chem 2011; 25:871-5. [PMID: 21054237 DOI: 10.3109/14756360903489581] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Inhibitory effects of some drugs on glucose 6-phosphate dehydrogenase from the erythrocytes of human have been investigated. For this purpose, at the beginning, erythrocyte glucose 6-phosphate dehydrogenase was purified 2256 times in a yield of 44.22% by using ammonium sulphate precipitation and 2', 5'-ADP Sepharose 4B affinity gel. Temperature of +4°C was maintained during the purification process. Enzyme activity was determined with the Beutler method by using a spectrophotometer at 340 nm. This method was utilized for all kinetic studies. Ketotifen, dacarbazine, thiocolchicoside, meloxicam, methotrexate, furosemide, olanzapine, methylprednizolone acetate, paricalcitol, ritodrine hydrochloride, and gadobenate-dimeglumine were used as drugs. All the drugs indicated the inhibitory effects on the enzyme. Ki constants for glucose 6-phosphate dehydrogenase were found by means of Lineweaver-Burk graphs. While methylprednizolone acetate showed competitive inhibition, the others displayed non-competitive inhibition. In addition, IC(50) values of the drugs were determined by plotting Activity% vs [I].
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Affiliation(s)
- Ebru Akkemik
- Ataturk University, Science Faculty, Department of Chemistry, Erzurum, Turkey
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14
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Akkemik E, Budak H, Ciftci M. Effects of some drugs on human erythrocyte 6-phosphogluconate dehydrogenase: an in vitro study. J Enzyme Inhib Med Chem 2010; 25:476-9. [DOI: 10.3109/14756360903257900] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ebru Akkemik
- Department of Chemistry, Science Faculty, Ataturk University, Erzurum, Turkey
| | - Harun Budak
- Department of Chemistry, Science Faculty, Ataturk University, Erzurum, Turkey
| | - Mehmet Ciftci
- Department of Chemistry, Science Faculty, Ataturk University, Erzurum, Turkey
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15
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Adem S, Ciftci M. Effects of some drugs on human erythrocyte 6-phosphogluconate dehydrogenase: anin vitrostudy. J Enzyme Inhib Med Chem 2008; 22:751-4. [DOI: 10.1080/14756360701229044] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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16
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Bülbül M, Erat M. Investigation of the effects of some sulfonamide derivatives on the activities of glucose-6-phosphate dehydrogenase, 6-phospho gluconate dehydrogenase and glutathione reductase from human erythrocytes. J Enzyme Inhib Med Chem 2008; 23:418-23. [DOI: 10.1080/14756360701546413] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Affiliation(s)
- Metín Bülbül
- Department of Chemistry, Dumlupinar University, Art and Science Faculty, Kütahya, Turkey
| | - Mustafa Erat
- Atatürk University, Biotechnology Application and Research Center, Erzurum, Turkey
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17
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Casella S, Pace M, Romano P, Romano L, Romano O, Geraci A, Crupi M. Antibiotic effects on SO4(2-) uptake in human erythrocytes. Cell Biochem Funct 2008; 26:297-302. [PMID: 17990296 DOI: 10.1002/cbf.1430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The erythrocyte is a cell highly exposed to oxygen pressure that, in turn, provokes oxidative stress involving loss of SH-groups, cell shrinkage by activation of K(+)-Cl(-) cotransport (KCC) and membrane destabilization which plays an important role in the premature haemolysis of red blood cells (RBCs). Oxidative stress provoked by chemicals frequently occurs in human erythrocytes. The aim of this study was to test whether the antibiotics alter the redox state and investigate their influences on band 3 protein that is involved in the facilitated electro neutral exchange of Cl(-) for HCO(3)(-) across the membrane of mammalian erythrocytes. Normal erythrocytes were treated with some antibiotics and thiol oxidizing agent N-ethylmaleimide (NEM) and tested for sulphate uptake, K(+) efflux and for glutathione (GSH) concentration as an index of oxidative stress. The rate constant of SO(4)(=) uptake measured in erythrocytes treated with antibiotics as well as NEM was decreased with respect to control cells as a result of band 3 SH-groups oxidation or the stress-induced K(+)-Cl(-) symport-mediated cell shrinkage. In fact, this hypothesis was verified by increased K(+) efflux and decreased GSH values measured in treated erythrocytes compared to controls.
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Affiliation(s)
- S Casella
- Department of General Physiology and Pharmacology, Faculty of Science MM.FF.NN., Messina, Italy
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18
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Ciftci M, Yilmaz H, Coban TA, Gul M, Gumustekin K, Dane S. Effects of nicotine and vitamin E on 6-phosphogluconate dehydrogenase activity in some rat tissues in vivo and in vitro. J Enzyme Inhib Med Chem 2008; 23:261-5. [PMID: 18343913 DOI: 10.1080/14756360701505559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
The aim of this study was to investigate whether nicotine affects 6-phosphogluconate dehydrogenase (6PGD) enzyme activity in some rat tissues, and to see the modulatory effects of vitamin E on this effect in vivo. In addition, the effects of nicotine and vitamin E on 6PGD activity were also tested in vitro. The groups were: nicotine [0.5 mg/kg/day, intraperitoneal (i.p.)]; nicotine + vitamin E [75 mg/kg/day, intragastric (i.g.)]; and control group (receiving only vehicles). There were eight rats per group and supplementation period was 3 weeks. The results of in vivo study showed that nicotine activated the muscle, lungs, and testicular 6PGD enzyme activity but had no effect on heart and liver 6PGD activity. Also, nicotine + vitamin E activated the muscle, testicle, and liver 6PGD enzyme activity, while this combination had no effect on heart, and lungs in vivo. When nicotine is administered with vitamin E the increase in 6PGD enzyme activity in muscle and testicles were lower. On the other hand the increase in 6PGD enzyme activity was eliminated by vitamin E in lungs, while 6PGD enzyme activity was increased by vitamin E, which was not affected by nicotine only. In vitro results correlated well with in vivo experimental results. Our results suggest that vitamin E may favourably increase 6PGD enzyme activity in liver in nicotine treated rats, while it has negligible effects on this enzyme activity in other tissues.
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Affiliation(s)
- Mehmet Ciftci
- Arts and Science Faculty, Department of Chemistry, Atatürk University, Erzurum, Turkey.
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Erat M. Purification of 6-phosphogluconate dehydrogenase from chicken liver and investigation of some kinetic properties. Prep Biochem Biotechnol 2005; 35:53-69. [PMID: 15704497 DOI: 10.1081/pb-200041446] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
6-phosphogluconate (6PG) dehydrogenase (EC 1.1.1.44; 6PGD) was purified from chicken liver; some kinetic and characteristic properties of the enzyme were investigated. The purification procedure consisted of four steps: preparation of the hemolysate, ammonium sulfate precipitation, 2',5'-ADP Sepharose 4B affinity chromatography, and Sephadex G-200 gel filtration chromatography. Thanks to the four consecutive procedures, product having a specific activity of 61 U (mg proteins)(-1), was purified 344-fold with a yield of 5.57%. Optimum pH, stable pH, optimum temperature, and KM and Vmax values for NADP+ and 6PG substrates were determined for the enzyme. Molecular weight of the enzyme was also determined by Sephadex G-200 gel filtration chromatography and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). In addition, Ki values and inhibition types were estimated by means of Lineweaver-Burk graphs obtained for NADPH and CO2 products.
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Affiliation(s)
- Mustafa Erat
- Biotechnology Application and Research Center, Atatürk University, Erzurum, Turkey.
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