2EBI

Arabidopsis GT-1 DNA-binding domain with T133D phosphomimetic mutation

Summary for 2EBI

• Entry DOI: 10.2210/pdb2ebi/pdb
• Related: 2JMW
• Descriptor: DNA binding protein GT-1 (1 entity in total)
• Functional Keywords: dna-binding domain, phosphorylation, dna binding protein
• Biological source: Arabidopsis thaliana (thale cress)
• Cellular location: Nucleus: Q9FX53
• Total number of polymer chains: 1
• Total formula weight: 10367.90

Authors

Nagata, T.,Noto, K.,Niyada, E.,Ikeda, Y.,Yamamoto, Y.,Uesugi, S.,Murata, J.,Hiratsuka, K.,Katahira, M. (deposition date: 2007-02-08, release date: 2008-02-19, Last modification date: 2024-05-22)

Primary citation

Nagata, T.,Niyada, E.,Fujimoto, N.,Nagasaki, Y.,Noto, K.,Miyanoiri, Y.,Murata, J.,Hiratsuka, K.,Katahira, M.
Solution structures of the trihelix DNA-binding domains of the wild-type and a phosphomimetic mutant of Arabidopsis GT-1: mechanism for an increase in DNA-binding affinity through phosphorylation.
Proteins, 78:3033-3047, 2010

PubMed Abstract: GT-1 is a plant transcription factor that binds to one of the cis-acting elements, BoxII, which resides within the upstream promoter region of light-responsive genes. GT-1 was assumed to act as a molecular switch modulated through Ca(2+)-dependent phosphorylation/dephosphorylation in response to light signals. It was shown previously that the phosphorylation of threonine 133 in the DNA-binding domain (DBD) of GT-1 results in enhancement of the BoxII-binding activity. Interestingly, point mutation of Thr133 to Asp also enhances the BoxII-binding activity. Here, we report the solution structures of hypothetical trihelix DBDs of the wild-type (WT) and a phosphomimetic mutant (T133D) of GT-1. First, we demonstrated that the isolated DBD of GT-1 alone has the ability to bind to DNA, and that the T133D mutation of the isolated DBD can enhance the DNA-binding affinity. The structures of these DBDs turned out to be almost identical. The structural topology resembles that of Myb DBDs, but all α-helices are longer in GT-1. Our NMR titration experiments suggested that these longer α-helices yield an enlarged DNA-binding surface. The phosphorylation site is located at the N-terminus of the third α-helix. We built a structural model of the T133D DBD:BoxII complex with the program HADDOCK. The model resembles the structure of the TRF1 DBD:telomeric DNA complex. Interestingly, the model implies that the phosphorylated side chain may directly interact with the bases of DNA. On the basis of our findings, we propose a mechanism by which the DNA-binding activity toward BoxII of the phosphorylated GT-1 could be enhanced.

PubMed: 20717979
DOI: 10.1002/prot.22827

Experimental method

SOLUTION NMR