Photophysics of SBFO: a fluorescent indicator for Na+

Article Abstract:

Experiments were conducted to measure sodium ion (Na+) concentrations using the fluorescent indicator SBFO. Using global compartmental analysis, the values of four rate constants in excited-state reactions were measured. The global biexponential analyses failed to provide a precise value for fluorescence decay traces of SBFO in the Na+ concentrations. However, estimated rate constant values ranged from 0.465 to 0.127. It was also observed that the excited-state reaction had negligible impact on the fluorimetric estimation of Kd.

Measurement, Sodium, Sodium (Chemical element), Electrolytes, Fluorescence spectroscopy

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Theoretical studies of the origin on beta-sheet twisting

Article Abstract:

Right-handed twisting is a fundamental structural feature of beta-plated sheets in globular proteins, which is critical for their geometry and function. Density functional theory using the B3LYP exchange-correlation functional and the split-valence 6-31G basis set is utilized to examine the structure and conformational transitions of single and double-stranded antiparrallel B-sheet models to determine the driving force for the right-handed twisting.

Proteins, Protein structure, Density functionals, Density-functional theory, Globular proteins

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Nanosecond fluorescence dynamic stokes shift of tryptophan in a protein matrix

Article Abstract:

The fluorescent dynamic stokes shift method has emphasized a time-dependent dipolar relaxation process around the single tryptophan residue (Trp31) in cytidine monophosphate kinase from E.coli. This Trp residue, located close to the protein surface in a hydrophobic pocket, is weakly accessible to acrylamide, a water-soluble quencher.

Electric properties, Tryptophan

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