Related Experiment Videos
Surface plasmon resonance for measuring TBP-promoter interaction
Everly Conway de Macario1, Ulrich H Rudofsky, Alberto J L Macario
1Division of Molecular Medicine, Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201-0509, USA. everlym@wadsworth.org
Biochemical and Biophysical Research Communications
|November 7, 2002
Summary
A new surface plasmon resonance (SPR) method quantifies archaeal TATA-binding protein (TBP) interactions with stress-gene promoters. This technique allows detailed analysis of TBP binding kinetics and affinities, crucial for understanding gene regulation.
Area of Science:
- Molecular Biology
- Biophysics
- Genetics
Background:
- TATA-binding proteins (TBPs) are essential transcription factors regulating gene expression in archaea.
- Understanding TBP-promoter interactions is key to deciphering gene regulation under various conditions.
Purpose of the Study:
- To develop a real-time measurement procedure for archaeal TBP-promoter interactions.
- To quantify the binding kinetics and affinities of Methanosarcina mazeii TBP to stress-gene promoters.
Main Methods:
- Surface Plasmon Resonance (SPR) using BIACORE 3000 and SA Sensor Chip.
- Real-time monitoring of TBP binding to immobilized DNA promoters.
- Analysis of sensorgram data to calculate equilibrium constants (K(A)) and association rates (k(a)).
Main Results:
- Quantified equilibrium constants (K(A)) for M. mazeii TBP with stress genes (grpE, hsp70, hsp40) and a non-stress gene (orf16).
- Determined higher association rates (k(a)) for TBP binding to stress-gene promoters compared to the non-stress gene.
- Demonstrated the feasibility of real-time analysis of TBP-promoter interactions.
Conclusions:
- The developed SPR procedure enables precise, real-time measurement of archaeal TBP-promoter interactions.
- Binding parameters correlate with gene expression patterns, distinguishing stress-induced from constitutive genes.
- This method facilitates comparative analysis of TBPs and promoters under diverse physiological and stress conditions.