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Updated: Aug 15, 2026

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy
Published on: February 7, 2019
Determination of the DNA binding site of the GAL4 protein. A photo-CIDNP study
Y Serikawa1, M Shirakawa, Y Kyogoku
1Institute for Protein Research, Osaka University, Japan.
Abstract:
After the assignment of 1H NMR signals of aromatic side chains by means of specific deuteration, we analyzed the DNA binding site of GAL4 by measuring photo-CIDNP spectra. The results showed that Trp36 is involved in both the specific interaction with UASG and non-specific DNA binding. This residue is located inside the Cys-rich region, but outside the putative Zn-finger. The photo-CIDNP spectrum also showed that the side chains of Tyr40 and His53 are not exposed on the surface of the protein.

