This entry represents an ACT-like domain found at the C-terminal of plant transcription factors, such as transcription factor GLABRA 3 from Arabidopsis and the bHLH transcription factor (swissprot:A0A060CUZ2) from maize, which is associated with bHLH ...
This entry represents an ACT-like domain found at the C-terminal of plant transcription factors, such as transcription factor GLABRA 3 from Arabidopsis and the bHLH transcription factor (swissprot:A0A060CUZ2) from maize, which is associated with bHLH domains. This domain association is unique to the plantae kingdom [1]. Phylogenetic analysis show that the association of ACT-like and bHLH domains occurred early in Plantae by recruitment of an ACT-like domain in a common ancestor with widely distributed ACT DOMAIN REPEAT (ACR) genes by an ancestral bHLH gene. The functional significance of this association relies on the homodimer formation of ACT-like domains that negatively affects DNA binding of the associated bHLH domains [1]. For some bHLH transcription factors with the C-terminal ACT-like domain, such as Arabidopsis SPEECHLESS and MUTE, the ACT-like domain serves as heterodimerisation selectivity interface.
