Non-receptor tyrosine-protein kinase TNK1 (TNK1) (TNK1)

Non-receptor tyrosine-protein kinase TNK1 (TNK1) is a member of the ACK family of non-receptor tyrosine kinases that serves as a critical regulator of cell survival and signaling [2, 5]. It is uniquely characterized by a C-terminal ubiquitin-association (UBA) domain, which allows it to act as a sensor for poly-ubiquitin clusters [4, 12]. The activity of TNK1 is controlled by a molecular switch: it is sequestered and inactivated by 14-3-3 proteins when phosphorylated at S502, but becomes active upon release and binding to ubiquitin [6, 9]. Dysregulation of TNK1, often through gene fusions like TNK1-C17orf61 or overexpression, has been identified as an oncogenic driver in hematological malignancies such as Hodgkin's lymphoma and various leukemias [11, 14]. Beyond its role in cancer, TNK1 is implicated in inflammatory processes, including Crohn's disease and acute kidney injury, and has been linked to Alzheimer's disease through genetic markers [13, 14]. Pharmacological targeting of TNK1 focuses on small-molecule inhibitors like TP-5801, which bind to the ATP-binding pocket to inhibit its catalytic function [1, 3]. Preclinical studies have shown that TNK1 inhibition can effectively block tumor growth in TNK1-dependent models [4, 6]. However, therapeutic development must account for potential off-target effects on related kinases like ACK1 and the protein's complex role as a potential tumor suppressor in certain solid tumor contexts [2, 11].

Other names

KOS1Thirty-eight-negative kinase 1CD38-negative kinase 1Tyrosine kinase non-receptor 1

ATP-competitive inhibition of tyrosine kinase catalytic activity