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• W2785333016 abstract "Lectins, multivalent carbohydrate-binding proteins of non-immune origin, have the unique ability to decode the information contained in complex carbohydrate structures of glycoproteins and glycolipids by stereo-specifically recognizing and binding to carbohydrates and carbohydrate linkages. The ubiquitous distribution of lectins in all forms of life and viruses along with their involvement in various biological processes such as cell-cell communication, host-pathogen interaction, cancer metastasis, embryogenesis, tissue development and mitogenic stimulation further emphasizes the importance of lectins in biological systems. Although not much is known about the endogenous roles of plant lectins, they constitute the most thoroughly studied class of lectins. On the basis of their subunit folds plant lectins have been divided in six major classes. They include jelly roll fold lectins (or legume lectins), hevein domain lectins (or cereal lectins), β-trefoil fold lectins, β-prism II fold lectins (or bulb lectins), β-prism I fold lectins and the most recently discovered lectin homologous to cyanovirin-N (http://www.cermav.cnrs.fr/lectines). Interestingly, of these, lectin subunits harbor an approximate three-fold symmetry in three cases and each subunit is believed to have evolved through successive gene duplication, fusion and divergent evolution. One of the major research activities in this laboratory involves structural studies on plant lectins. Decades of extensive studies in the laboratory have shed light on various structural and functional aspects of lectins such as variability in quaternary association, lectin-carbohydrate interactions, strategies for generating ligand specificity and multivalency. Furthermore, the β-prism I fold was first identified as a lectin fold in this laboratory through the X-ray analysis of the methyl-α-galactose complex of jacalin, one of the two lectins from the seeds of Artocarpus integrifolia. Subsequently, many other lectins with the same fold have been structurally characterized here and else where (http://www.cermav.cnrs.fr/lectines). They include mannose specific tetrameric artocarpin and dimeric banana lectin studied in this laboratory. Also investigated here is the structure of first dimeric β-prism II fold lectin, namely, garlic lectin. The subsequent work, carried out by the author, on the structure and dynamics of three-fold symmetric lectins form the subject matter of this thesis. Different web-servers available at NCBI and EXPASY web sites were used for sequence annotation studies. MRBAYES and MEGA were used for phylogenetic analysis. Molecular dynamics (MD) simulations were carried out using the simulation package GROMACS v.3.3.1. OPLS-AA/L and GLYCAM-06 force fields were used for proteins and carbohydrates respectively. Simulations were performed in explicit water system with TIP4P water model under NPT conditions with unit dielectric constant. The hanging drop method was used for crystallizing banana lectin and its complexes. Intensity data were collected on a MAR 345…" @default.
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• W2785333016 date "2010-05-01" @default.
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• W2785333016 title "Structural Studies On Three-Fold Symmetric Plant Lectins" @default.
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