Cassian D'Cunha

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The N-myc gene is amplified in 20-25% of human neuroblastomas, and this amplification serves as a poor prognostic factor. However, few genes have been determined to be direct targets of N-myc. Our current studies focused on identifying N-myc target genes, especially those affected in cells such as neuroblastomas that have high levels of N-myc protein. To(More)
Overexpression of c-Myc can lead to altered transcriptional regulation of cellular genes and to neoplastic transformation. Although DNA binding is clearly required, the mechanism by which recruitment of c-Myc to target promoters results in transcriptional activation is highly debated. Much of this controversy comes from the difficulty in clearly defining a(More)
The mechanism of acid-catalyzed keto-enol tautomerization of β-cyclopentanedione (CPD) in solution is studied computationally. Reaction profiles are first calculated for a limited solvation environment using ab initio and density functional methods. Barrier heights for systems including up to one hydration shell of explicit water molecules depend strongly(More)
Molecular dynamics simulations of an explicitly solvated cis-β-methylstyrene/chloroperoxidase-Compound I complex are performed to determine the cause of the high enantiospecificity of epoxidation. From the simulations, a two-dimensional free energy potential is calculated to distinguish binding potential wells from which reaction to 1S2R and 1R2S epoxide(More)
The Center for Internet Augmented Research and Assessment (CIARA) NSF CI-TEAM demonstration project "CyberBridges" is a new model for creating a new generation of scientists and engineers who are capable of fully integrating Grid into the whole educational, professional, and creative process of their respective disciplines. CyberBridges augments graduate(More)
Correlation times for rotation of deuterated methyls in crystalline leucine, valine, and cyclo-L-alanyl-L-alanine are calculated with molecular dynamics and compared with NMR data. The simulations distinguish between methyls having different steric environments in the crystal, yielding correlation times differing by a factor of up to 30 for methyls within a(More)
The relation of rotational correlation times to adiabatic rotational barriers for alanine methyl groups in staphylococcal nuclease (SNase) is investigated. The hypothesis that methyl rotational barriers may be useful probes of local packing in proteins is supported by an analysis of ten X-ray crystal structures of SNase mutants. The barrier heights are(More)
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