CBL（Cbl proto-oncogene），癌症关联基因，基因ID：867，这个基因是一个原癌基因，编码一个无名指E3泛素连接酶。编码蛋白是蛋白酶体降解底物所需的酶之一。该蛋白介导泛素从泛素结合酶（E2）转移到特定底物。该蛋白还包含一个N端磷酸酪氨酸结合域，使其与许多酪氨酸磷酸化底物相互作用，并以蛋白酶体降解为靶点。因此，它作为许多信号转导途径的负调节器发挥作用。该基因在包括急性髓系白血病在内的许多癌症中被发现突变或易位。这种基因的突变也是努南综合征样疾病的原因。This gene is a proto-oncogene that encodes a RING finger E3 ubiquitin ligase. The encoded protein is one of the enzymes required for targeting substrates for degradation by the proteasome. This protein mediates the transfer of ubiquitin from ubiquitin conjugating enzymes (E2) to specific substrates. This protein also contains an N-terminal phosphotyrosine binding domain that allows it to interact with numerous tyrosine-phosphorylated substrates and target them for proteasome degradation. As such it functions as a negative regulator of many signal transduction pathways. This gene has been found to be mutated or translocated in many cancers including acute myeloid leukaemia. Mutations in this gene are also。