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Proceedings Paper

Binding of antennapedia homeodomain as studied by time-resolved fluorescence anisotropy measurements
Author(s): Remo A. Hochstrasser
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Paper Abstract

The accurate determination of binding constants for protein:DNA complexes is highly desirable. In the biological sciences such binding constants are often determined by gel methods that may introduce severe interactions and therefore might strongly influence the value of the physical constants. Optical methods that are also very often used are limited in protein:DNA complexes because of the overlap of the DNA and the protein absorption. To be able to use absorption or fluorescence spectroscopy it is therefore necessary to introduce labels either on the protein, the DNA, or on both. In this study an approach based on time-resolved fluorescence spectroscopy is used to determine the binding of the antennapedia homeodomain from drosophila to its operator sequence. The increase of the anisotropy decay time of fluorescently labeled DNA upon protein binding can be used to monitor binding. Oligonucleotides which include a fluorescent base analog or which are fluorescently labeled at the 5' end can be used for this purpose.

Paper Details

Date Published: 17 August 1994
PDF: 6 pages
Proc. SPIE 2137, Time-Resolved Laser Spectroscopy in Biochemistry IV, (17 August 1994);
Show Author Affiliations
Remo A. Hochstrasser, Univ. of Basel (Switzerland)


Published in SPIE Proceedings Vol. 2137:
Time-Resolved Laser Spectroscopy in Biochemistry IV
Joseph R. Lakowicz, Editor(s)

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