Kelch-like protein 40 (Klhl40)

Substrate-specific adapter of a BCR (BTB-CUL3-RBX1) E3 ubiquitin ligase complex that acts as a crucial regulator of skeletal muscle development (PubMed:25940086). The BCR(KLHL40) complex acts by mediating ubiquitination and degradation of TFDP1, thereby regulating the activity of the E2F:DP transcription factor complex (PubMed:25940086).

Promotes stabilization of LMOD3 by acting as a negative regulator of LMOD3 ubiquitination; the molecular process where it negatively regulates ubiquitination of LMOD3 is however unclear (PubMed:24960163). .