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Secondary structure and interactions
The secondary structure of the protein allows it to bind with the DNA : The T-box domain consists of several repeats of β-strands and α-helices and is involved in both dimerization and DNA binding. The crystal structure of the α-helices of the T-box domain bound to DNA strongly suggests that the amino group of K313 is associated with the phosphate of a DNA base via hydrogen-bond interaction.
Thanks to some post-translational modifications of the protein’s residues, the transcription factor TBX21 can bind with DNA and some proteins. Firstly, the ubiquitination of the residue K313 allows TBX21 to bind with the DNA sequence. Secondly, the phosphorylation of some residues allows TBX21 to interact with several proteins : the phosphorylation of T302 allows TBX21 to interact with NFAT, the one of Y304 allows TBX21 to interact with RUNX1, the one of S508 allows the interaction with NF-кB p65 and finally the one of Y525 allows the interaction with GATA-3.
Functions
Structural highlights
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