Manas Kumar Das

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Concurrent synthesis of overlapping octameric peptides corresponding to the sequence of the Torpedo acetylcholine receptor (AChR) alpha subunit has been carried out on polypropylene supports functionalized with primary amino groups according to a method developed by M. Geysen [(1987) J. Immunol. Methods 102, 259-274]. The peptides on the solid supports have(More)
Crystallins are a diverse group of proteins that constitute nearly 90% of the total soluble proteins of the vertebrate eye lens and these tightly packed crystallins are responsible for transparency of the lens. These proteins have been studied in different model and non-model species for understanding the modifications they undergo with ageing that lead to(More)
The conformations of the 16-residue fungal peptide antiamoebin I (Ac-Phe-Aib-Aib-Aib-D-Iva-Gly-Leu-Aib-Aib-Hyp-Gln-D-Iva-Hyp-Aib-Pro-P hol) have been investigated in dimethyl sulfoxide solution by one- and two-dimensional NMR techniques. A substantial number of resonances in the 270-MHz 1H NMR spectrum have been assigned. Intramolecularly hydrogen-bonded(More)
Monoclonal antibodies to the main immunogenic region of the nicotinic acetylcholine receptor have been studied with regard to their binding to synthetic peptides. It was found that monoclonal antibody 210 to the main immunogenic region binds to the synthetic fragment spanning residues 66 to 76 of the alpha subunits of the acetylcholine receptor from human(More)
A new rhodamine based chemosensor, cyano-rhodamine, has been designed and synthesized with a green approach which shows a specific 'C-CN' bond breaking with the action of the Pd(2+) ion to produce the specific color and fluorescence of rhodamine 6G itself in solution and in HeLa cells.
Transmembrane channel-forming polypeptides can function as uncouplers of mitochondrial oxidative phosphorylation. The observed effects are dependent on the phosphate ion (Pi) concentration in the medium. At low Pi (2.5 mM) the order of uncoupling efficiencies is gramicidin A much greater than alamethicin greater than tetraacetyl melittin greater than(More)
The initial structural alteration of RNAase A due to acid denaturation (0.5 N HCl, 30 degrees C) that accompanies deamidation (without altering enzymic activity) has been dectected by spectrophotometric titration, fluorescence and ORD/CD measurements. It is shown that acid treated RNAase A has an altered conformation at neutral pH, 25 degrees C. This is(More)