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Bioscience

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Displaying 1126 - 1150 of 1242

Electronic Structure and Spectra of Oxovanadium Silicate

January 11, 1999
Author(s)
Morris Krauss
The electronic structure and spectroscopy of the oxovanadium catalytic center on a silica surface is modeled with the molecule OV(OSIH 3)3. Excited electronic states are examined at optimized geometries for the ground singlet and triplet states. For both

Spectroscopy of 2-aminopurine: An MCSCF Study

December 1, 1998
Author(s)
E L. Rachofsky, J B. Ross, Morris Krauss, R Osman
2-aminopurine (2AP) is a highly fluorescent isomer of adenine that can be incorporated into DNA as a probe of structure, dynamics, and protein-DNA interactions. Interpretation of the fluorescence of 2AP in DNA requires a model of the electronic structure

Exploration of the Structural Environment of the Iron-Sulfur Cluster in Putidaredoxin by Nitrogen-15 NMR Spectroscopy of Selectively Labeled Cysteine Residues

August 28, 1998
Author(s)
Fahriye N. Sari, Marcia J. Holden, M P. Mayhew, V L. Vilker, B Coxon
Putidaredoxin is a di-iron protein whose paramagnetic region is not well characterized by 1H detected NMR. We have studied the structure of this region in greater detail by directly observed 15N NMR of oxidized and reduced putidaredoxin preparations in

Determination of the Conformations of cAMP Receptor Protein and Its T127L/S128A Mutant with and without cAMP from Small Angle Neutron Scattering Measurements

August 7, 1998
Author(s)
Susan Krueger, I Gorshkova, J W. Brown, J Hoskins, K H. McKenney, Frederick P. Schwarz
Small angle scattering measurements were performed on solutions of cAMP receptor protein (CRP) and on solutions of the T127->A double mutant of CRP (DM) in D 2O K 3PO 4 buffer containing 0.6 M KCl, in the absence and presence of 3',5' cyclic adenosine

A Thermodynamic Investigation of Reactions Catalyzed by Tryptophan Synthase

July 27, 1998
Author(s)
N Kishore, Yadu D. Tewari, D Akers, Robert N. Goldberg, E. W. Miles
Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of the following reactions catalyzed by the tryptophan synthase [alpha] 2[Beta] 2 complex (EC 4.2.1.20) and its subunits:indole(aq) + L
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