Enzyme ATP-binding site (ATP-binding site)

The enzyme ATP-binding site is a highly conserved structural domain found in a vast array of proteins, including kinases, ATPases, and certain transporters, where it facilitates the binding and hydrolysis of adenosine triphosphate (ATP) to drive biological processes [UniProt: Protein Kinase Domain]. This site typically consists of a glycine-rich loop, a hinge region, and a hydrophobic pocket that coordinates the adenine, ribose, and phosphate moieties of ATP [PubMed: 12114521]. In therapeutic contexts, these sites are the primary focus for small-molecule inhibitors, particularly in oncology, where they are targeted to block the aberrant signaling of oncogenic kinases [NIH: National Cancer Institute]. Most clinical inhibitors are ATP-competitive, binding directly within this pocket to prevent the enzyme from performing its catalytic function [Nature Reviews Drug Discovery: Kinase Inhibitors]. However, the high degree of structural conservation across the kinome makes achieving high drug selectivity difficult, often resulting in off-target toxicities [StatPearls: Kinase Inhibitors]. Additionally, the development of resistance through mutations in the binding site, such as gatekeeper mutations, remains a significant clinical challenge in treating diseases like chronic myeloid leukemia and non-small cell lung cancer [PubMed: 21414292].

Other names

ATP pocketAdenosine triphosphate binding siteNucleotide-binding domainCatalytic ATP-binding site

Competitive inhibition of ATP binding to the catalytic pocket of enzymes, thereby preventing phosphorylation or energy-dependent conformational changes [Nature Reviews Drug Discovery].