{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T21:12:08Z","timestamp":1774386728992,"version":"3.50.1"},"update-to":[{"DOI":"10.1371\/journal.pcbi.1014094","type":"new_version","label":"New version","source":"publisher","updated":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T00:00:00Z","timestamp":1774310400000}}],"reference-count":59,"publisher":"Public Library of Science (PLoS)","issue":"3","license":[{"start":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T00:00:00Z","timestamp":1773878400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Science Center","award":["2021\/41\/B\/NZ8\/02835"],"award-info":[{"award-number":["2021\/41\/B\/NZ8\/02835"]}]},{"name":"Infrastructure PLGrid ACK Cyfronet AGH","award":["PLG\/2022\/015642 and PLG\/2025\/017999"],"award-info":[{"award-number":["PLG\/2022\/015642 and PLG\/2025\/017999"]}]}],"content-domain":{"domain":["www.ploscompbiol.org"],"crossmark-restriction":false},"short-container-title":["PLoS Comput Biol"],"abstract":"<jats:p>\n                    Hsp70 chaperones are crucial for maintaining protein homeostasis by regulating the stability and conformational states of client polypeptides through ATP dependent cycles of binding and release. These cycles are driven by conformational transitions in Hsp70 upon ATP binding and hydrolysis. The ATPase activity of Hsp70 is controlled by J-domain protein (JDP) cochaperones, which allosterically stimulate ATP hydrolysis through interactions between their J-domains (JDs) and Hsp70. The JD binds at the interface between the nucleotide binding domain (NBD) and substrate binding domain (SBD) of ATP bound Hsp70. While it is well-established that JD interaction involves the conserved histidine-proline-aspartic acid (HPD) motif and residues in helices II and III, the mechanism by which JD-induced allosteric signals propagate to the distal nucleotide-binding pocket - and the conformational changes that facilitate ATP hydrolysis - remains unclear. Here, we addressed these questions using all-atom free energy simulations and dynamic network analysis, starting from crystal structures of ATP-bound DnaK (Hsp70) alone and in complex with the JD of DnaJ (JDP). We show that JD binding rearranges the NBD nucleotide-binding pocket into a hydrolysis competent state, characterized by the formation of a contact between the hydroxyl group of the universally conserved threonine 199 (T199) and the \u03b3-phosphate of ATP. Network analysis revealed that the allosteric signal driving this rearrangement propagates along\n                    <jats:italic>\u03b2<\/jats:italic>\n                    -strands 13 and 14 towards T199. Moreover, we provide a mechanistic understanding for this signal transmission, demonstrating that steric repulsion between JD helix III and the SBD, alongside\n                    <jats:italic>\u03b2<\/jats:italic>\n                    -strand 14 disruption, facilitate T199-ATP contact formation. Overall, our study provides mechanistic insights into allosteric signal transmission within Hsp70, bridging the gap between JD binding and ATPase stimulation.\n                  <\/jats:p>","DOI":"10.1371\/journal.pcbi.1014094","type":"journal-article","created":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T17:29:32Z","timestamp":1773941372000},"page":"e1014094","update-policy":"https:\/\/doi.org\/10.1371\/journal.pcbi.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Mechanism of Hsp70 activation: How J-domain proteins push for ATP 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