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Mondal P, Dasgupta S, Pathak T. Carboxymethyl tethered poly(disubstituted)triazoles built on nucleoside skeletons: A unique class of ribonuclease A inhibitors designed using chemical logic. Bioorg Med Chem 2022; 76:117065. [PMID: 36436488 DOI: 10.1016/j.bmc.2022.117065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 09/22/2022] [Accepted: 10/11/2022] [Indexed: 01/05/2023]
Abstract
Molecular docking of N-1,4-disubstituted-1,2,3-triazole tethered carboxymethylated thymidine and uridine with ribonuclease A, indicated their possible binding with the P1, B1 and P2 subsites with varied efficiencies. This theoretical study in combination of our earlier experimental observations was used as the guiding principles for designing a range of 1,4-disubstituted 1, 2, 3- triazole tethered carboxymethylated pyrimidine nucleosides. Triazoles are biologically important molecules and at the same time easily accessible through less complicated synthetic routes as reported about two decades back in the context of "click" reactions. Regioselective propargylation of the nucleosides under controlled conditions followed by the use of CuAAC strategy afforded mono-, bis-, tris- and tetratriazolyl pyrimidine nucleosides. Although the characteristics of nucleosides were lost in these densely functionalized polyheterocycles, the catalytic efficiency of ribonuclease A was significantly reduced by these molecules which were investigated experimentally and by docking studies. Triazoles as linkers helped one or more acidic groups to reach the P1 subsite of ribonuclease A. Enzyme kinetics showed that the efficiency of inhibition reached the highest point with an optimum number of functional groups and were not linearly dependent on the number of triazole tethered carboxymethyl groups. The location of the triazole ring in the molecule affected the efficiency and nature of inhibition which were the result of the overall structure of the modified nucleosides. Thus, the tris-triazolylated thymidine derivative (T-3', 5', N-tris-CH2TzCH2COOH) as opposed to tetra-triazolylated uridine (U-2', 3', 5', N-tetrakis-CH2TzCH2COOH) emerged as the best inhibitor with an inhibition constant value of 2.3 ± 0.05 µM.
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Affiliation(s)
- Pampa Mondal
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India.
| | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India.
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Hawass MAE, Sanad SMH, Elwahy AHM, Abdelhamid IA. Hantzsch synthesis of bis(pyrido[2,3-d:6,5-d']dipyrimidines), bis(pyrimido[4,5-b]quinolines), and bis(benzo[4,5]imidazo[2,1-b]quinazolines) linked to pyrazole units as novel hybrid molecules. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1913604] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Das A, Dasgupta S, Pathak T. Design of configuration-restricted triazolylated β-d-ribofuranosides: a unique family of crescent-shaped RNase A inhibitors. Org Biomol Chem 2020; 18:6340-6356. [PMID: 32766618 DOI: 10.1039/d0ob01286f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Seven new carbohydrate-bistriazole hybrid molecules were designed taking into consideration the crescent shaped active site of ribonuclease A (RNase A). In this case, the β-d-ribofuranose structure was used as the basic building unit; both the C1 and C4 arms protruding out towards the β-face of the tetrahydrofuran moiety of the ribose sugar provided an overall "U" shape to the basic building block. Several combinations of bistriazole moieties were constructed on the two arms of this basic building block. These mono- and/or bis-substituted 1,2,3-triazole units were linked to acidic functional groups because of the overall basic nature of the hydrolytic site of RNase A. All these compounds were efficient competitive inhibitors of RNase A with inhibition constants (Ki) in the micromolar range. In contrast to the carboxylic acid-modified hybrid molecules, molecules carrying sulfonic acids were found to be more potent because of the stronger interactions with the positively charged active site. The most efficient inhibitor of the series was the disulfonic acid-functionalized carbohydrate-bis-triazole hybrid molecule. Docking studies disclosed that the molecule, because of its well defined "U" shape with flexible arms, fits effectively in the active site; moreover, in all cases, besides the acid groups, the triazole and sugar rings also actively participated in creating the hydrogen bonding network in the cavity of the enzyme active site.
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Affiliation(s)
- Ashrukana Das
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India.
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India.
| | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721 302, West Bengal, India.
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Wang R, Yu R, Wang Z, Zhu Q, Dai Z. A facile and sensitive colorimetric detection for RNase A activity based on target regulated protection effect on plasmonic gold nanoparticles aggregation. Sci China Chem 2020; 63:860-4. [DOI: 10.1007/s11426-020-9702-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Abstract
Due to its high catalytic activity and readily available supply, ribonuclease A (RNase A) has become a pivotal enzyme in the history of protein science. Moreover, this great interest has carried over to computational chemistry and molecular dynamics, where RNase A has become a model system for various types of studies, all the while being an important drug design target in its own right. Here, we present a detailed molecular dynamics study of RNase–ligand binding involving 22 compounds, spanning nearly five orders of magnitude in affinity, and totaling 8.8 μs of sampling with the standard Amber parameters and an additional 8.8 μs of sampling with a modified potential. We show that short-lived, solvent-mediated bridging interactions are crucial to RNase–ligand binding. We characterize the behavior of bridging solvent molecules, uncovering a power-law dependence between the lifetime of a solvent bridge and the probability of its occurrence. We also demonstrate that from an energetic perspective, bridging solvent in RNase A–ligand binding behaves like part of the enzyme, rather than the ligands. Moreover, we describe an automated pipeline for the detection and processing of bridging interactions, and offer an independent assessment of the performance of the state-of-the-art fixed-charge force fields. Thus, our work has broad implications for drug design and computational chemistry in general.
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Affiliation(s)
- Stefan M. Ivanov
- Faculty of Pharmacy, Medical University of Sofia, Sofia, Bulgaria
- * E-mail:
| | - Ivan Dimitrov
- Faculty of Pharmacy, Medical University of Sofia, Sofia, Bulgaria
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Abstract
Sulfonic nucleic acids were identified as inhibitors of ribonuclease A (RNase A). The incorporation of a strongly acidic group (sulfonic, -SO3H) at the 3'-end of pyrimidine nucleosides thymidine and uridine was prompted by the low inhibition constant (Ki) values recorded for carboxymethylsulfonyl (-SO2CH2CO2H) and -CO2H functionalized nucleosides. It was envisaged that the sulfonic acid-modified pyrimidines would bind effectively with the positively charged P1 site of ribonuclease A. Typical harsh conditions used for SO3H incorporation were replaced with milder reaction conditions. The uridine analogue showing a Ki value of 0.96 μM elicited a better result than the thymidine-modified inhibitor. Notably, it was also the best result among all modified non-phosphate acidic nucleosides reported and screened so far as RNase A inhibitors.
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Affiliation(s)
- Dhrubajyoti Datta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
| | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
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Tong C, Zhao C, Liu B, Li B, Ai Z, Fan J, Wang W. Sensitive Detection of RNase A Activity and Collaborative Drug Screening Based on rGO and Fluorescence Probe. Anal Chem 2018; 90:2655-2661. [PMID: 29368520 DOI: 10.1021/acs.analchem.7b04429] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In addition to being an important object in theoretical and experimental studies in enzymology, RNase A also plays an important role in the development of many kinds of diseases by regulating various physiological or pathological processes, including cell growth, proliferation, differentiation, and invasion. Thus, it can be used as a useful biomarker for disease theranostics. Here, a simple, sensitive, and low-cost assay for RNase A was constructed by combining a fluorogenic substrate with reduced graphene oxide (rGO). The method with detection limit of 0.05 ng/mL was first applied for RNase A targeted drug screening, and 14 natural compounds were identified as activators of this enzyme. Then, it was applied to detect the effect of drug treatment and Hepatitis B virus (HBV) infection on RNase A activity. The results indicated that RNase A level in tumor cells was upregulated by G-10 and Chikusetsusaponin V in a concentration-dependent manner, while the average level of RNase A in the HBV infection group was significantly inhibited compared with that in the control group. Furthermore, the concentration-dependent inhibitory effect of heavy metal ions on RNase A was observed using the method and the results indicated that Ba2+, Co2+, Pb2+, As3+, and Cu2+ inhibited RNase A activity with IC50 values of 93.7 μM (Ba2+), 90.9 μM (Co2+), 110.6 μM (Pb2+), 171.5 μM (As3+), and 165.1 μM (Cu2+), respectively. In summary, considering the benefits of rapidity and high sensitivity, the method is practicable for RNase A assay in biosamples and natural compounds screening in vitro and in vivo.
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Affiliation(s)
- Chunyi Tong
- College of Biology, Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chem/Biosensing and Chemometrics, Hunan University , Changsha 410082, China
| | - Chuan Zhao
- College of Biology, Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chem/Biosensing and Chemometrics, Hunan University , Changsha 410082, China
| | - Bin Liu
- College of Biology, Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chem/Biosensing and Chemometrics, Hunan University , Changsha 410082, China
| | - Bin Li
- TCM and Ethnomedicine Innovation & Development Laboratory, School of Pharmacy, Hunan University of Chinese Medicine , Changsha 410208, China
| | - Zhaoyang Ai
- Institute of Cognition and Bio-physics Linguistics, College of FLs, Hunan University , Changsha 410082, China
| | - Jialong Fan
- College of Biology, Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, State Key Laboratory of Chem/Biosensing and Chemometrics, Hunan University , Changsha 410082, China
| | - Wei Wang
- TCM and Ethnomedicine Innovation & Development Laboratory, School of Pharmacy, Hunan University of Chinese Medicine , Changsha 410208, China
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Kayet A, Datta D, Das A, Dasgupta S, Pathak T. 1,5-Disubstituted 1,2,3-triazole linked disaccharides: Metal-free syntheses and screening of a new class of ribonuclease A inhibitors. Bioorg Med Chem 2018; 26:455-462. [DOI: 10.1016/j.bmc.2017.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 11/28/2017] [Accepted: 12/02/2017] [Indexed: 10/18/2022]
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Datta D, Dasgupta S, Pathak T. Carboxymethylsulfonylated Ribopyrimidines: Rational Design of Ribonuclease A Inhibitors Employing Chemical Logic. ChemMedChem 2016; 11:620-8. [PMID: 26945688 DOI: 10.1002/cmdc.201600007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Indexed: 11/11/2022]
Abstract
Hydrolysis of RNA by ribonuclease A crucially depends on the participation of the 2'-OH group as well as the positioning of the internucleotide bond at two different sites of the enzyme. Therefore, ribopyrimidines were modified with -SO2CH2CO2H, an acidic functional group, which was expected to interact with the phosphate binding site. These ribonucleosides were designed to understand the influence of the 2'-OH group of these inhibitors on ribonuclease A inhibition along with the effect of the -SO2CH2CO2H group. The "down" configuration of the 2'-OH group enhanced the inhibitory properties (Ki =1.75 μm) and also imparted important Val43 H-bonding with the furanose oxygen atom of the inhibitors. One of the most important aspects of this work is that there was no serendipitous discovery of the inhibitors. The inhibitors reported in this manuscript were obtained by design by employing chemical logic.
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Affiliation(s)
- Dhrubajyoti Datta
- Department of Chemistry, Indian Institute of Technology (IIT)-Kharagpur, Kharagpur, 721302, India
| | - Swagata Dasgupta
- Department of Chemistry, Indian Institute of Technology (IIT)-Kharagpur, Kharagpur, 721302, India.
| | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology (IIT)-Kharagpur, Kharagpur, 721302, India.
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Banik R, Roy S, Kirillov AM, Bauza A, Frontera A, Rodríguez-Diéguez A, Salas JM, Maniukiewicz W, Das SK, Das S. Two mixed-ligand cadmium(ii) compounds bearing 5-nitrosopyrimidine and N-donor aromatic blocks: self-assembly generation, structural and topological features, DFT studies, and Hirshfeld surface analysis. CrystEngComm 2016. [DOI: 10.1039/c6ce00989a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Chatzileontiadou DSM, Parmenopoulou V, Manta S, Kantsadi AL, Kylindri P, Griniezaki M, Kontopoulou F, Telopoulou A, Prokova H, Panagopoulos D, Boix E, Balatsos NAA, Komiotis D, Leonidas DD. Triazole double-headed ribonucleosides as inhibitors of eosinophil derived neurotoxin. Bioorg Chem 2015; 63:152-65. [PMID: 26551065 DOI: 10.1016/j.bioorg.2015.10.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 10/26/2015] [Accepted: 10/30/2015] [Indexed: 02/01/2023]
Abstract
Eosinophil derived neurotoxin (EDN) is an eosinophil secretion protein and a member of the Ribonuclease A (RNase A) superfamily involved in the immune response system and inflammatory disorders. The pathological actions of EDN are strongly dependent on the enzymatic activity and therefore, it is of significant interest to discover potent and specific inhibitors of EDN. In this framework we have assessed the inhibitory potency of triazole double-headed ribonucleosides. We present here an efficient method for the heterologous production and purification of EDN together with the synthesis of nucleosides and their biochemical evaluation in RNase A and EDN. Two groups of double-headed nucleosides were synthesized by the attachment of a purine or a pyrimidine base, through a triazole group at the 3'-C position of a pyrimidine or a purine ribonucleoside, respectively. Based on previous data with mononucleosides these compounds were expected to improve the inhibitory potency for RNase A and specificity for EDN. Kinetics data revealed that despite the rational, all but one, double-headed ribonucleosides were less potent than the respective mononucleosides while they were also more specific for ribonuclease A than for EDN. Compound 11c (9-[3'-[4-[(cytosine-1-yl)methyl]-1,2,3-triazol-1-yl]-β-d-ribofuranosyl]adenine) displayed a stronger preference for EDN than for ribonuclease A and a Ki value of 58μM. This is the first time that an inhibitor is reported to have a better potency for EDN than for RNase A. The crystal structure of EDN-11c complex reveals the structural basis of its potency and selectivity providing important guidelines for future structure-based inhibitor design efforts.
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Affiliation(s)
| | - Vanessa Parmenopoulou
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Stella Manta
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Anastassia L Kantsadi
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Paroula Kylindri
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Marianna Griniezaki
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Filitsa Kontopoulou
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Aikaterini Telopoulou
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Helena Prokova
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Dimitrios Panagopoulos
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Ester Boix
- Department of Biochemistry and Molecular Biology, Faculty of Biosciences, Universitat Autònoma de Barcelona, Spain
| | - Nikolaos A A Balatsos
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece
| | - Dimitri Komiotis
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece.
| | - Demetres D Leonidas
- Department of Biochemistry and Biotechnology, University of Thessaly, 26 Ploutonos Str., 41221 Larissa, Greece.
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Datta D, Dasgupta S, Pathak T. Ribonuclease A inhibition by carboxymethylsulfonyl-modified xylo- and arabinopyrimidines. ChemMedChem 2014; 9:2138-49. [PMID: 25125220 DOI: 10.1002/cmdc.201402179] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Indexed: 11/10/2022]
Abstract
A group of acidic nucleosides were synthesized to develop a new class of ribonuclease A (RNase A) inhibitors. Our recent study on carboxymethylsulfonyl-modified nucleosides revealed some interesting results in RNase A inhibition. This positive outcome triggered an investigation of the role played by secondary sugar hydroxy groups in inhibiting RNase A activity. Uridines and cytidines modified with SO2 CH2 COOH groups at the 2'- and 3'-positions show good inhibitory properties with low inhibition constant (Ki ) values in the range of 109-17 μM. The present work resulted in a set of inhibitors that undergo more effective interactions with the RNase A active site, as visualized by docking studies.
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Affiliation(s)
- Dhrubajyoti Datta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur (India), Fax: (+91) 3222-255303
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Dinda AK, Tripathy DR, Das A, Dasgupta S. Comparison of the ribonucleolytic activity of the dityrosine cross-linked Ribonuclease A dimer with its monomer in the presence of inhibitors. Int J Biol Macromol 2014; 63:107-13. [DOI: 10.1016/j.ijbiomac.2013.10.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 10/24/2013] [Indexed: 11/18/2022]
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Datta D, Samanta A, Dasgupta S, Pathak T. Synthesis of 5′-carboxymethylsulfonyl-5′-deoxyribonucleosides under mild hydrolytic conditions: a new class of acidic nucleosides as inhibitors of ribonuclease A. RSC Adv 2014. [DOI: 10.1039/c3ra45084h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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Datta D, Samanta A, Dasgupta S, Pathak T. 3′-Oxo-, amino-, thio- and sulfone-acetic acid modified thymidines: Effect of increased acidity on ribonuclease A inhibition. Bioorg Med Chem 2013; 21:4634-45. [DOI: 10.1016/j.bmc.2013.05.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 01/13/2023]
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Das VK, Thakur AJ. Nanorod-Shaped Basic Al2O3 Catalyzed N,N-Diformylation of Bisuracil Derivatives: A Greener "NOSE" Approach. ISRN Org Chem 2013; 2013:793159. [PMID: 24052870 DOI: 10.1155/2013/793159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Accepted: 06/10/2013] [Indexed: 12/04/2022]
Abstract
A feasible “NOSE” (nanoparticles-catalyzed organic synthesis enhancement) protocol has been developed for N,N-diformylation of bisuracil derivatives using nano-Al2O3 rods as an efficient, inexpensive, and recyclable catalyst under solvent-free reaction condition at 40°C. The catalyst was reused up to the 4th cycle without affecting the rate and yield of the N,N-diformylation products appreciably.
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Parmenopoulou V, Chatzileontiadou DS, Manta S, Bougiatioti S, Maragozidis P, Gkaragkouni D, Kaffesaki E, Kantsadi AL, Skamnaki VT, Zographos SE, Zounpoulakis P, Balatsos NA, Komiotis D, Leonidas DD. Triazole pyrimidine nucleosides as inhibitors of Ribonuclease A. Synthesis, biochemical, and structural evaluation. Bioorg Med Chem 2012; 20:7184-93. [DOI: 10.1016/j.bmc.2012.09.067] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 09/21/2012] [Accepted: 09/24/2012] [Indexed: 11/22/2022]
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Chakraborty S, Sanz Miguel PJ, Albertí FM, Das N. Construction of preorganized uracil based polytopic tectons for hydrogen-bonded supramolecular architectures. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.02.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Debnath J, Dasgupta S, Pathak T. Dinucleosides with Non-Natural Backbones: A New Class of Ribonuclease A and Angiogenin Inhibitors. Chemistry 2012; 18:1618-27. [DOI: 10.1002/chem.201102816] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Indexed: 11/11/2022]
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Samanta A, Dasgupta S, Pathak T. 5′-Modified pyrimidine nucleosides as inhibitors of ribonuclease A. Bioorg Med Chem 2011; 19:2478-84. [DOI: 10.1016/j.bmc.2010.08.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 08/27/2010] [Accepted: 08/28/2010] [Indexed: 10/19/2022]
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Das S, Thakur AJ. A Clean, Highly Efficient and One-Pot Green Synthesis of Aryl/Alkyl/Heteroaryl-Substituted Bis(6-amino-1,3-dimethyluracil-5-yl)methanes in Water. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001581] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Wang K, Wu L, Qin Z, Yan X, Li X, Chen H, Zhang P, Zhang J. Synthesis and antitumor activity of novel ribonucleosides with C-5 OH replaced by a diaminopyrimidinyl group. Bioorg Med Chem Lett 2011; 21:916-9. [DOI: 10.1016/j.bmcl.2010.12.069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 12/12/2010] [Accepted: 12/15/2010] [Indexed: 11/21/2022]
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Debnath J, Dasgupta S, Pathak T. Comparative inhibitory activity of 3′- and 5′-functionalized nucleosides on ribonuclease A. Bioorg Med Chem 2010; 18:8257-63. [DOI: 10.1016/j.bmc.2010.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 10/03/2010] [Accepted: 10/05/2010] [Indexed: 10/19/2022]
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Bhattacharya R, Kesharwani MK, Manna C, Ganguly B, Suresh CG, Pathak T. An Experimental and Theoretical Study on the Remarkable Influence of Protecting Groups on the Selectivity of Addition of Amines to Vinyl Sulfone-Modified Hex-2-enopyranosides. J Org Chem 2009; 75:303-14. [DOI: 10.1021/jo902046g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rahul Bhattacharya
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
| | - Manoj K. Kesharwani
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (CSIR), Bhavnagar 364 002, Gujarat, India
| | - Chinmoy Manna
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
| | - Bishwajit Ganguly
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (CSIR), Bhavnagar 364 002, Gujarat, India
| | | | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
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Debnath J, Dasgupta S, Pathak T. Inhibition of ribonuclease A by nucleoside–dibasic acid conjugates. Bioorg Med Chem 2009; 17:6491-5. [DOI: 10.1016/j.bmc.2009.08.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Revised: 08/07/2009] [Accepted: 08/11/2009] [Indexed: 11/18/2022]
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