Regulates signaling cascades probably through protein ubiquitination and/or sequestration. Functions in insulin signaling and glucose homeostasis through IRS1 ubiquitination and subsequent proteasomal degradation. Inhibits also prolactin; growth hormone and leptin signaling by preventing STAT3 and STAT5 activation; sequestering them in the cytoplasm and reducing their binding to DNA. May be a substrate recognition component of a SCF- like E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins (By similarity). {ECO:0000250}.