Deepthi Gopal

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A series of stilbenes has been prepared and tested for cytotoxicity in the five human cancer cell lines A-549 non-small cell lung, MCF-7 breast, HT-29 colon, SKMEL-5 melanoma, and MLM melanoma. The cis stilbenes 6a-f proved to be cytotoxic in all five cell lines, with potencies comparable to that of combretastatin A-4. These cytotoxic compounds were all(More)
An array of cis-, trans-, and dihydrostilbenes and some N-arylbenzylamines were synthesized and evaluated for their cytotoxicity in the five cancer cell cultures A-549 lung carcinoma, MCF-7 breast carcinoma, HT-29 colon adenocarcinoma, SKMEL-5 melanoma, and MLM melanoma. Several cis-stilbenes, structurally similar to combretastatins, were highly cytotoxic(More)
Methylation of 2-[(2,4-dinitrophenyl)amino]ethyl triphosphate (dNOTP) was found to abolish its ability to support actin sliding in the in vitro motility assay. A comparative study of the interaction of myosin subfragment 1 (S1) and actoS1 with methylated (MdNOTP) and non-methylated dNOTP was undertaken. Both analogues were shown to be substrates for S1(More)
The ion binding properties of horse, bovine, and tuna cytochrome c (both oxidized and reduced) have been measured using a combination of ultrafiltration, neutron activation, and ion chromatography. The ions investigated were chloride, phosphate, and Tris-cacodylate. Ion chromatography and neutron activation analysis techniques were employed to determine the(More)
Myosin subfragment 1 hydrophobicity was found to be sensitive to the occupancy and nature of bound nucleotide at its active site, as shown by changes in elution behavior of unmodified and chemically modified S1 during phenyl hydrophobic chromatography. The elution properties of S1 were unaltered by alkylation of SH1 (Cys-707) with N-ethylmaleimide or by(More)
Evidence is presented that MgADP can be noncovalently trapped in myosin subfragment 1 in the presence of ScFx resulting in the concomitant loss of ATPase function. The rate of inactivation in the presence of MgCl2 at 25 degrees C is 8.7 M-1 s-1 which is too slow for a simple collisional mechanism and suggests that a subsequent slow isomerization step is(More)
The identity of a major side-product of attempted 2,3-dihydropyrazine dehydrogenation has been elucidated using a geminal dimethyl analog [2,2,5,6-tetramethyl-2,3-dihydropyrazine (1)] which cannot aromatize. 1H, 13C NMR and GC-MS analyses were consistent with the formulation of the product as a symmetrical dimer of 1, but did not allow unambiguous(More)
The neurotoxic gamma-diketone, 2,5-hexanedione (2,5-HD), induces neurofilamentous swellings at prenodal sites in proximal axons as a consequence of pyrrolation of lysine epsilon-amino groups on neurofilament proteins. However, there is disagreement as to whether pyrrole formation and the associated alteration of noncovalent interactions is sufficient to(More)
The effect of torsional freedom about the N-glycoside bond of ATP in the ability of the nucleoside triphosphate to support chemomechanical transduction (Takenaka et al., 1978) has been investigated by examining the ability of the nucleotide analogue 2',3'-dideoxy-2',3'-didehydro-ATP (1b, enf-ATP) to act as a substrate for myosin subfragment 1 in the(More)
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