Automated description from the Alliance of Genome Resources (Release 7.1.0)
Enables DNA-binding transcription factor binding activity; DNA-binding transcription repressor activity, RNA polymerase II-specific; and E-box binding activity. Involved in circadian regulation of gene expression and entrainment of circadian clock by photoperiod. Acts upstream of or within negative regulation of DNA-templated transcription. Located in nucleus. Is expressed in several structures, including alimentary system; brain; genitourinary system; hemolymphoid system; and integumental system. Orthologous to human BHLHE40 (basic helix-loop-helix family member e40).