Beta-transducin repeat-containing protein (BTRC)

Beta-transducin repeat-containing protein (BTRC), also known as beta-TrCP1, is a critical F-box protein that serves as the substrate recognition subunit of the SCF (Skp1-Cullin1-F-box) E3 ubiquitin ligase complex [UniProt: P63151]. It plays a pivotal role in cellular homeostasis by mediating the phosphorylation-dependent ubiquitination and subsequent proteasomal degradation of key regulatory proteins, including beta-catenin, IkappaB, and CDC25A [PubMed: 15181464]. Through these interactions, BTRC modulates essential signaling pathways such as Wnt/beta-catenin and NF-kappaB, which govern cell proliferation, survival, and the immune response [NCBI Gene: 8945]. In the context of disease, BTRC is often dysregulated in various malignancies, including colorectal and pancreatic cancers, where it can function as either an oncogene or a tumor suppressor depending on the specific cellular context and the stability of its substrates [PubMed: 24513166]. Furthermore, BTRC is exploited by viruses like HIV-1, which uses its Vpu protein to hijack the ligase and degrade CD4, facilitating viral release [PubMed: 9843217]. Therapeutically, BTRC is being explored as a recruitment module for Proteolysis Targeting Chimeras (PROTACs) to induce the degradation of neo-substrates, although its broad range of natural targets poses challenges for achieving high specificity and minimizing systemic toxicity [PubMed: 32111836].

Other names

F-box/WD repeat-containing protein 1AFBXW1Abeta-TrCP1BTRCPFBXW1F-box and WD repeats protein beta-TrCP

Substrate recognition and recruitment for SCF-type E3 ubiquitin ligase-mediated polyubiquitination and subsequent 26S proteasomal degradation.