6sdg
From Proteopedia
Crystal structure of the DNA binding domain of M. polymorpha Auxin Response Factor 2 (MpARF2) in complex with High Affinity DNA
Structural highlights
FunctionA0A0G3FH20_MARPO Auxin response factors (ARFs) are transcriptional factors that bind specifically to the DNA sequence 5'-TGTCTC-3' found in the auxin-responsive promoter elements (AuxREs).[RuleBase:RU004561] Publication Abstract from PubMedAuxin controls numerous growth processes in land plants through a gene expression system that modulates ARF transcription factor activity(1-3). Gene duplications in families encoding auxin response components have generated tremendous complexity in most land plants, and neofunctionalization enabled various unique response outputs during development(1,3,4). However, it is unclear what fundamental biochemical principles underlie this complex response system. By studying the minimal system in Marchantia polymorpha, we derive an intuitive and simple model where a single auxin-dependent A-ARF activates gene expression. It is antagonized by an auxin-independent B-ARF that represses common target genes. The expression patterns of both ARF proteins define developmental zones where auxin response is permitted, quantitatively tuned or prevented. This fundamental design probably represents the ancestral system and formed the basis for inflated, complex systems. Design principles of a minimal auxin response system.,Kato H, Mutte SK, Suzuki H, Crespo I, Das S, Radoeva T, Fontana M, Yoshitake Y, Hainiwa E, van den Berg W, Lindhoud S, Ishizaki K, Hohlbein J, Borst JW, Boer DR, Nishihama R, Kohchi T, Weijers D Nat Plants. 2020 May;6(5):473-482. doi: 10.1038/s41477-020-0662-y. Epub 2020 May , 15. PMID:32415296[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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