Tyrosine kinase ATP-binding site (TK ATP-binding site)

The tyrosine kinase ATP-binding site is a highly conserved pocket located within the catalytic domain of tyrosine kinases, which are enzymes that regulate key cellular processes by transferring phosphate groups from ATP to specific tyrosine residues on substrate proteins [1.1.1, 1.3.2]. This site is situated in a cleft between the N-terminal and C-terminal lobes of the kinase domain and is characterized by structural features such as a glycine-rich loop and a conserved lysine residue essential for anchoring ATP [1.1.2, 1.4.1]. As a critical component of signal transduction pathways, the ATP-binding site facilitates signals for cell growth, differentiation, and survival [1.3.1, 1.3.3]. Dysregulation or mutations in tyrosine kinases often lead to constitutive activation of this site, driving the progression of various cancers, including chronic myeloid leukemia and non-small cell lung cancer [1.2.4, 1.3.2]. Small-molecule tyrosine kinase inhibitors (TKIs) primarily target this site by acting as ATP-competitive antagonists, thereby blocking downstream oncogenic signaling [1.2.1, 1.2.3]. While highly effective, targeting this site presents challenges such as off-target toxicities due to its conservation across the kinome and the emergence of drug resistance through gatekeeper mutations [1.2.4, 1.2.5]. Therapeutic monitoring often involves identifying specific genetic alterations in the kinase domain to guide the selection of appropriate inhibitors [1.2.4, 1.4.2].

Other names

ATP-binding pocketCatalytic domain of tyrosine kinasesKinase domainNucleotide-binding siteSH1 domain

Competitive inhibition of ATP binding within the catalytic domain of tyrosine kinases