Kelch-like protein 15 (KLHL15)

Substrate-specific adapter for CUL3 E3 ubiquitin-protein ligase complex (PubMed:14528312). Acts as an adapter for CUL3 to target the serine/threonine-protein phosphatase 2A (PP2A) subunit PPP2R5B for ubiquitination and subsequent proteasomal degradation, thus promoting exchange with other regulatory subunits (PubMed:23135275).

Acts as an adapter for CUL3 to target the DNA- end resection variable RBBP8/CtIP for ubiquitination and subsequent proteasomal degradation. Through the regulation of RBBP8/CtIP protein turnover, plays an integral role in DNA damage response, favoring DNA double-strand repair through error-prone non- homologous end joining (NHEJ) over error-free, RBBP8-mediated homologous recombination (HR) (PubMed:27561354).