The crystal structure of the TCP domain of PCF6 in Oryza sativa L. reveals an RHH-like fold.

Lifang Sun, Xiaoming Zou, Meiqin Jiang, Xiuling Wu, Yayu Chen, Qianchao Wang, Qin Wang, Lifei Chen, Yunkun Wu

FEBS letters 2020 Apr

filter terms:

The Teosinte branched 1/Cycloidea/Proliferating cell factor (TCP) domain is an evolutionarily conserved DNA binding domain unique to the plant kingdom. To date, the functions of TCPs have been well studied, but the three-dimensional structure of the TCP domain is lacking. Here, we have determined the crystal structure of the TCP domain from OsPCF6. The structure reveals that the TCP domain adopts three short β-strands followed by a helix-loop-helix structure, distinct from the canonical basic helix-loop-helix structure. This folded domain shows high structural similarity to the ribbon-helix-helix (RHH) transcriptional repressors, a family of DNA binding proteins with a conserved 3D structural motif (RHH fold), indicating that TCPs could be reclassified as RHH proteins. Our work will provide insight toward a better understanding of the mechanisms underlying TCP protein function. © 2020 Federation of European Biochemical Societies.

Citation

Lifang Sun, Xiaoming Zou, Meiqin Jiang, Xiuling Wu, Yayu Chen, Qianchao Wang, Qin Wang, Lifei Chen, Yunkun Wu. The crystal structure of the TCP domain of PCF6 in Oryza sativa L. reveals an RHH-like fold. FEBS letters. 2020 Apr;594(8):1296-1306