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Mishra SK, Madduluri VK, Rangan K, Sah AK. N-Glycoconjugates: Selective colorimetric chemosensors for aspartic acid and cysteine. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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2
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Sivaiah A, Nag R, Pulla Rao C. Glyco‐Conjugate Design and Demonstration as Receptors for the Species of Biological, Ecological and Medical Importance: Support from Spectroscopy and Microscopy. ChemistrySelect 2021. [DOI: 10.1002/slct.202004157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Areti Sivaiah
- Department of chemistry Vellore Institute of Technology-Andhra Pradesh (VIT-AP) University, Inavolu, Amaravati, Guntur Andhra Pradesh 522237 India
| | - Rahul Nag
- Department of Chemistry Indian Institute of Technology Tirupati, Settipalli (Post),Tirupati−517506 Andhra Pradesh India
| | - Chebrolu Pulla Rao
- Department of Chemistry Indian Institute of Technology Tirupati, Settipalli (Post),Tirupati−517506 Andhra Pradesh India
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3
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Afzal M, Al-Lohedan HA, Usman M, Tabassum S. Carbohydrate-based heteronuclear complexes as topoisomerase Iα inhibitor: approach toward anticancer chemotherapeutics. J Biomol Struct Dyn 2018; 37:1494-1510. [PMID: 29606083 DOI: 10.1080/07391102.2018.1459321] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Due to the critical role of cellular enzymes necessary for cell proliferation by deciphering topological hurdles in the process of DNA replication, topoisomerases have been one of the major targets in the anticancer drug development area. A need, therefore, arises for new metallodrugs that specifically recognizes DNA and inhibits the activity of topoisomerase enzymes, herein, we report the synthesis and characterization of new metal-based glycoconjugate entities containing heterobimetallic core CuII-SnIV (1) and NiII-SnIV (2) derived from N-glycoside ligand (L). The optimized structure of complex 1 and other significant vibrational modes have been explained using dispersion corrected B3LYP/DFT calculations. In vitro DNA binding profile of the L and both the complexes 1 and 2 were done by various biophysical studies. Complex 1 breaks pBR322 DNA via a hydrolytic means which was validated by T4 DNA enzymatic assay. To get a mechanistic insight of mode of action topoisomerase I (Topo I) inhibition assay was carried out. Also, we have taken the help of molecular modeling studies in accordance with experimental findings. In vitro cytotoxicity of the complex 1 was evaluated against a panel of cancer cells which exhibited remarkably good anticancer activity (GI50 values <10 μg/ml). Moreover, intracellular localization of the complex 1 was visualized by confocal microscopy against HeLa cells.
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Affiliation(s)
- Mohd Afzal
- a Department of Chemistry , Aligarh Muslim University , Aligarh 202002 , India
| | - Hamad A Al-Lohedan
- b Surfactant Research Chair, Department of Chemistry, College of Science , King Saud University , P.O. Box 2455, Riyadh 11451 , Saudi Arabia
| | - Mohammad Usman
- a Department of Chemistry , Aligarh Muslim University , Aligarh 202002 , India
| | - Sartaj Tabassum
- b Surfactant Research Chair, Department of Chemistry, College of Science , King Saud University , P.O. Box 2455, Riyadh 11451 , Saudi Arabia
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4
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Li X, Wang K, Ma N, Jia X. Poly(Ionic Liquid) Based Chemosensors for Detection of Basic Amino Acids in Aqueous Medium. Front Chem 2017; 5:69. [PMID: 29018795 PMCID: PMC5622980 DOI: 10.3389/fchem.2017.00069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 09/11/2017] [Indexed: 11/30/2022] Open
Abstract
Naked-eye detection of amino acids (AA) in water is of great significance in the field of bioanalytical applications. Herein, polymerized ionic liquids (PILs) with controlled chain length structures were synthesized via reversible addition–fragmentation chain-transfer (RAFT) polymerization and post-quaternization approach. The AA recognition performance of PILs with different alkyl chain lengths and molecular weights was evaluated by naked-eye color change and ultraviolet-visible (UV–vis) spectral studies. These PILs were successfully used for highly sensitive and selective detection of Arg, Lys, and His in water. The recognition performance was improved effectively with increased molecular weight of PILs. The biosensitivity of the PILs in water was strongly dependent on their aggregation effect and polarization effect. Highly sensitive and selective detection of AA was successfully accomplished by introducing positively charged pyridinium moieties and controlled RAFT radical polymerization.
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Affiliation(s)
- Xinjuan Li
- Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, State Education Ministry of China, Henan Normal University, Xinxiang, China
| | - Kai Wang
- Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, State Education Ministry of China, Henan Normal University, Xinxiang, China
| | - Nana Ma
- Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, State Education Ministry of China, Henan Normal University, Xinxiang, China
| | - Xianbin Jia
- Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, State Education Ministry of China, Henan Normal University, Xinxiang, China
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5
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Chennaiah A, Bhowmick S, Vankar YD. Conversion of glycals into vicinal-1,2-diazides and 1,2-(or 2,1)-azidoacetates using hypervalent iodine reagents and Me3SiN3. Application in the synthesis of N-glycopeptides, pseudo-trisaccharides and an iminosugar. RSC Adv 2017. [DOI: 10.1039/c7ra08637g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Glycals react with PIFA (or PIDA)–TMSN3in presence of TMSOTf to form sugar derived 1,2-diazides and vicinal azidoacetates. Synthesis of 2-azido-N-glycopeptides, pseudotrisaccharides, and a piperidine triol derivative is reported.
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Affiliation(s)
- Ande Chennaiah
- Department of Chemistry
- Indian Institute of Technology
- Kanpur – 208016
- India
| | - Srijita Bhowmick
- Department of Chemistry
- Indian Institute of Technology
- Kanpur – 208016
- India
| | - Yashwant D. Vankar
- Department of Chemistry
- Indian Institute of Technology
- Kanpur – 208016
- India
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6
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7
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Areti S, Hinge VK, Rao CP. Pyrenyl-imino-C2-glucosyl conjugate: synthesis, characterization, and ratiometric and reversible OFF–ON receptor for Hg2+. Carbohydr Res 2014; 399:64-9. [DOI: 10.1016/j.carres.2014.06.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 05/30/2014] [Accepted: 06/06/2014] [Indexed: 01/03/2023]
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8
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Xu YW, Tan LL, Liu JM, Xiao LM, Li SY, Su CY. Fluorescent calix[4]arene chemosensor for acidic and basic amino acids in pure aqueous media. RSC Adv 2014. [DOI: 10.1039/c4ra04074k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
A fluorescent calix[4]arene chemosensor 2 displays high sensitivity toward acidic and basic amino acids in aqueous media through multiple H-bond interactions.
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Affiliation(s)
- Yao-Wei Xu
- MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275, China
| | - Li-Lin Tan
- MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275, China
| | - Jun-Min Liu
- MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275, China
| | - Li-Min Xiao
- School of Computer Science and Engineering
- Beihang University
- Beijing 100191, China
| | - Shao-Yong Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics)
- School of Pharmacy
- Basic Medical Research Center
- Tianjin Medical University
- Tianjin 300070, China
| | - Cheng-Yong Su
- MOE Laboratory of Bioinorganic and Synthetic Chemistry/KLGHEI of Environment and Energy Chemistry
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Chemistry and Chemical Engineering
- Sun Yat-Sen University
- Guangzhou 510275, China
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9
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Wei G, Zhang S, Dai C, Quan Y, Cheng Y, Zhu C. A New Chiral Binaphthalene-Based Fluorescence Polymer Sensor for the Highly Enantioselective Recognition of Phenylalaninol. Chemistry 2013; 19:16066-71. [DOI: 10.1002/chem.201302726] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Indexed: 01/11/2023]
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10
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Chinta JP, Rao CP. Triazole linked lower rim glycosyl appended 1,3-calix[4]arene conjugates: Synthesis, characterization, and their interaction with jacalin. Carbohydr Res 2013; 369:58-62. [DOI: 10.1016/j.carres.2012.09.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Revised: 09/09/2012] [Accepted: 09/11/2012] [Indexed: 11/29/2022]
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11
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Cu(II) complexes of glyco-imino-aromatic conjugates in DNA binding, plasmid cleavage and cell cytotoxicity. J CHEM SCI 2013. [DOI: 10.1007/s12039-012-0319-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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12
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Jiao J, Liu X, Mao X, Li J, Cheng Y, Zhu C. A coumarin-based chiral fluorescence sensor for the highly enantioselective recognition of phenylalaninol. NEW J CHEM 2013. [DOI: 10.1039/c2nj40739f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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13
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Craig D, Simpson J, Faulds K, Graham D. Formation of SERS active nanoparticle assemblies via specific carbohydrate–protein interactions. Chem Commun (Camb) 2013; 49:30-2. [DOI: 10.1039/c2cc36949d] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Soni K, Sah AK. Alanyl glycoconjugate: a selective receptor for free and protein-bound tryptophan. RSC Adv 2013. [DOI: 10.1039/c3ra40668g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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15
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Pathak RK, Tabbasum K, Rai A, Panda D, Rao CP. A Zn2+ specific triazole based calix[4]arene conjugate (L) as a fluorescence sensor for histidine and cysteine in HEPES buffer milieu. Analyst 2012; 137:4069-75. [PMID: 22822479 DOI: 10.1039/c2an35740b] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly fluorescent Zn(2+) complex of the triazole linked salicyl-imino-thiophenyl conjugate of calix[4]arene, [ZnL] has been demonstrated to be a chemo-sensing ensemble for the recognition of His and Cys among the naturally occurring amino acids in HEPES buffer milieu. The recognition behaviour of the [ZnL] towards these amino acids has been shown on the basis of fluorescence, absorption and visual fluorescent colour changes. The species of recognition were shown by ESI MS titrations, AFM & TEM microscopy and cell studies.
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Affiliation(s)
- Rakesh Kumar Pathak
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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16
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Li SY, Xu YW, Zeng SQ, Xiao LM, Duan HQ, Lin XL, Liu JM, Su CY. Highly selective fluorescent calix[4]arene chemosensor for acidic amino acids in pure aqueous media. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Bernier N, Esteves CV, Delgado R. Heteroditopic receptor based on crown ether and cyclen units for the recognition of zwitterionic amino acids. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.110] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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18
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Zhou Y, Yoon J. Recent progress in fluorescent and colorimetric chemosensors for detection ofamino acids. Chem Soc Rev 2012; 41:52-67. [DOI: 10.1039/c1cs15159b] [Citation(s) in RCA: 642] [Impact Index Per Article: 53.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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19
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A Zinc-Sensing Glucose-Based Naphthyl Imino Conjugate as a Detecting Agent for Inorganic and Organic Phosphates, Including DNA. Chemistry 2011; 17:8044-7. [DOI: 10.1002/chem.201100734] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Indexed: 11/07/2022]
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20
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Yang X, Liu X, Shen K, Fu Y, Zhang M, Zhu C, Cheng Y. Enantioselective fluorescent recognition of mandelic acid by unsymmetrical salalen and salan sensors. Org Biomol Chem 2011; 9:6011-21. [DOI: 10.1039/c1ob05361b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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21
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Mitra A, Mittal AK, Rao CP. Carbohydrate assisted fluorescence turn-on gluco–imino–anthracenyl conjugate as a Hg(ii) sensor in milk and blood serum milieu. Chem Commun (Camb) 2011; 47:2565-7. [DOI: 10.1039/c0cc04967k] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Acharya A, Ramanujam B, Chinta JP, Rao CP. 1,3-Diamido-calix[4]arene Conjugates of Amino Acids: Recognition of −COOH Side Chain Present in Amino Acids, Peptides, and Proteins by Experimental and Computational Studies. J Org Chem 2010; 76:127-37. [DOI: 10.1021/jo101759f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amitabha Acharya
- Bioinorganic Lab, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Balaji Ramanujam
- Bioinorganic Lab, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Jugun Prakash Chinta
- Bioinorganic Lab, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Chebrolu P. Rao
- Bioinorganic Lab, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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23
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Kumar A, Ramanujam B, Singhal NK, Mitra A, Rao CP. Interaction of aromatic imino glycoconjugates with jacalin: experimental and computational docking studies. Carbohydr Res 2010; 345:2491-8. [PMID: 20961532 DOI: 10.1016/j.carres.2010.09.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Revised: 09/04/2010] [Accepted: 09/13/2010] [Indexed: 10/19/2022]
Abstract
Altering the lectin properties by chemically modified glycoconjugates can have profound effect on their biological applications. In the present case, jacalin has been chosen to study the binding aspects toward glycoconjugates modified by connecting aromatic moieties through imine conjugation at their C-1- or C-2-positions. Out of 10 glycoconjugates, the galactosyl-naphthyl imine (1c) was found to be most effective toward agglutination inhibition (260 times better than galactose), quenching fluorescence intensity, and exhibiting greater binding (K(a), 1.3 × 10(4)M(-1)) with jacalin. The specific binding of galactose conjugates and the nonspecific binding of other conjugates have been demonstrated based on ITC. Changes in the secondary structures have been addressed by far- and near-UV CD spectroscopy. The present studies demonstrated that galactose-based conjugates bind at carbohydrate recognition domain (CRD) mainly through polar interactions in addition to exhibiting some nonpolar/hydrophobic interactions, whereas the conjugates other than galactose primarily interact through hydrophobic interactions. Binding of galactosyl conjugates at CRD has been further demonstrated by rigid docking.
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Affiliation(s)
- Amit Kumar
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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24
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Jiang L, Wang L, Zhang B, Yin G, Wang RY. Cell Compatible Fluorescent Chemosensor for Hg2+ with High Sensitivity and Selectivity Based on the Rhodamine Fluorophore. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000512] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Acharya A, Ramanujam B, Mitra A, Rao CP. Nanofibers formed through pi...pi stacking of the complexes of glucosyl-C2-salicyl-imine and phenylalanine: characterization by microscopy, modeling by molecular mechanics, and interaction by alpha-helical and beta-sheet proteins. ACS NANO 2010; 4:4061-4073. [PMID: 20521836 DOI: 10.1021/nn1006286] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper deals with the self-assembly of the 1:1 complex of two different amphiphiles, namely, a glucosyl-salicyl-imino conjugate (L) and phenylalanine (Phe), forming nanofibers over a period of time through pi...pi interactions. Significant enhancement observed in the fluorescence intensity of L at approximately 423 nm band and the significant decrease observed in the absorbance of the approximately 215 nm band are some characteristics of this self-assembly. Matrix-assisted laser desorption ionization/time of flight titration carried out at different time intervals supports the formation of higher aggregates. Atomic force microscopy (AFM), transmission electron microscopy, and scanning electron miscroscopy results showed the formation of nanofibers for the solutions of L with phenylalanine. In dynamic light scattering measurements, the distribution of the particles extends to a higher diameter range over time, indicating a slow kinetic process of assembly. Similar spectral and microscopy studies carried out with the control molecules support the role of the amino acid moiety over the simple -COOH moiety as well as the side chain phenyl moiety in association with the amino acid, in the formation of these fibers. All these observations support the presence of pi...pi interactions between the initially formed 1:1 complexes leading to the fiber formation. The aggregation of 1:1 complexes leading to fibers followed by the formation of bundles has been modeled by molecular mechanics studies. Thus the fiber formation with L is limited to phenylalanine and not to any other naturally occurring amino acid and hence a polymer composed of two different biocompatible amphiphiles. AFM studies carried out between the fiber forming mixture and proteins resulted in the observation that only BSA selectively adheres to the fiber among the three alpha-helical and two beta-sheet proteins studied and hence may be of use in some medical applications.
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Affiliation(s)
- Amitabha Acharya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai -400 076, India
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26
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Nagarajan S, Kumbhar A, Varghese B, Das TM. Structural and DNA cleavage of sugar-derived Schiff base ligands and their dinuclear Cu(II) complexes. Carbohydr Res 2010; 345:1077-83. [DOI: 10.1016/j.carres.2010.01.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2009] [Revised: 01/13/2010] [Accepted: 01/20/2010] [Indexed: 10/19/2022]
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27
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Mitra A, Chinta JP, Rao CP. 1-(d-Glucopyranosyl-2′-deoxy-2′-iminomethyl)-2-hydroxybenzene as chemosensor for aromatic amino acids by switch-on fluorescence. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.10.105] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Torvinen M, Neitola R, Sansone F, Baldini L, Ungaro R, Casnati A, Vainiotalo P, Kalenius E. Glucosylthioureidocalix[4]arenes: Synthesis, conformations and gas phase recognition of amino acids. Org Biomol Chem 2010; 8:906-15. [DOI: 10.1039/b916268b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Kumar A, Singhal NK, Ramanujam B, Mitra A, Rameshwaram NR, Nadimpalli SK, Rao CP. C(1)-/C(2)-aromatic-imino-glyco-conjugates: experimental and computational studies of binding, inhibition and docking aspects towards glycosidases isolated from soybean and jack bean. Glycoconj J 2009; 26:495-510. [PMID: 18953653 DOI: 10.1007/s10719-008-9199-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 09/24/2008] [Accepted: 10/01/2008] [Indexed: 11/28/2022]
Abstract
Several C(1)-imino conjugates of D: -galactose, D: -lactose and D: -ribose, where the nitrogen center was substituted by the salicylidene or naphthylidene, were synthesized and characterized. Similar C(2)-imino conjugates of D: -glucose have also been synthesized. All the glyco-imino-conjugates, which are transition state analogues, exhibited 100% inhibition of the activity towards glycosidases extracted from soybean and jack bean meal. Among these, a galactosyl-napthyl-imine-conjugate (1c) showed 50% inhibition of the activity of pure alpha-mannosidase from jack bean at 22 +/- 2.5 microM, and a ribosyl-naphthyl-imine-conjugate (3c) showed at 31 +/- 5.5 microM and hence these conjugates are potent inhibitors of glycosidases. The kinetic studies suggested non-competitive inhibition by these conjugates. The studies are also suggestive of the involvement of aromatic, imine and carbohydrate moieties of the glyco-imino-conjugates in the effective inhibition. The binding of glyco-imino-conjugate has been established by extensive studies carried out using fluorescence emission and isothermal titration calorimetry. The conformational changes resulted in the enzyme upon interaction of these derivatives has been established by studying the fluorescence quench of the enzyme by KI as well as from the secondary structural changes noticed in CD spectra. All these studies revealed the difference in the binding strengths of the naphthylidene vs. salicylidene as well as galactosyl vs. lactosyl moieties present in these conjugates. The differential inhibition of these glyco-conjugates has been addressed by quantifying the specific interactions present between the glyco-conjugates and the enzyme by using rigid docking studies.
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Affiliation(s)
- Amit Kumar
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India
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30
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Baghel GS, Ramanujam B, Rao CP. Selective recognition of Cu2+ by di-O-picolyl derivative of 1,1′-methylene-bis(2-naphthol). J Photochem Photobiol A Chem 2009. [DOI: 10.1016/j.jphotochem.2008.11.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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31
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Mitra A, Ramanujam B, Rao CP. 1-(d-Glucopyranosyl-2′-deoxy-2′-iminomethyl)-2-hydroxynaphthalene as chemo-sensor for Fe3+ in aqueous HEPES buffer based on colour changes observable with the naked eye. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2008.11.116] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Cavezza A, Boulle C, Guéguiniat A, Pichaud P, Trouille S, Ricard L, Dalko-Csiba M. Synthesis of Pro-XylaneTM: A new biologically active C-glycoside in aqueous media. Bioorg Med Chem Lett 2009; 19:845-9. [DOI: 10.1016/j.bmcl.2008.12.037] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2008] [Revised: 11/28/2008] [Accepted: 12/02/2008] [Indexed: 11/28/2022]
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