{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T07:09:42Z","timestamp":1778828982841,"version":"3.51.4"},"reference-count":52,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T00:00:00Z","timestamp":1765497600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,12,12]],"date-time":"2025-12-12T00:00:00Z","timestamp":1765497600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["ChemistryOpen"],"published-print":{"date-parts":[[2026,4]]},"abstract":"<jats:p>Heat\u2010shock protein 70 (Hsp70) is a ubiquitous stress chaperone whose over\u2010expression confers treatment resistance in many cancers. Recent structural and mechanistic work has uncovered an unexpected survival circuit: the proapoptotic BH3\u2010only protein Bim binds a nucleotide\u2010sensitive groove on the Hsp70 nucleotide\u2010binding domain, sequestering itself from Bax\/Bak while allosterically accelerating Hsp70's ATPase cycle and stabilizing oncogenic clients. This Hsp70\u2013Bim protein\u2013protein interaction (PPI) is enriched in tyrosine\u2010kinase\u2010inhibitor (TKI)\u2010resistant chronic myeloid leukemia, endocrine\u2010refractory breast cancer, glioblastoma, and other \u201cchaperone\u2010addicted\u201d tumors, making it a selective vulnerability rather than a housekeeping liability. Early linear and stapled BH3 peptides proved the groove is drug\u2010addressable but suffered from poor pharmacokinetics. A fragment\u2010assisted screen then delivered a phenalene\u2010dicarbonitrile chemotype, S1g\u20102, and optimized analogs that displace Bim with sub\u2010micromolar potency, dismantle Hsp70\u2013client hubs, and resensitize resistant xenografts to imatinib or tamoxifen without global proteostasis collapse. Orally bioavailable wedges thus convert a seemingly flat chaperone surface into an actionable checkpoint. This review integrates structural biology, assay technology, and medicinal chemistry to chart the rise of Hsp70\u2013Bim inhibitors, evaluates combination strategies with BH3 mimetics, TKIs, and proteasome inhibitors, and highlights remaining challenges\u2014cross\u2010isoform breadth, species\u2010relevant toxicology, biomarker\u2010guided dosing, and potential impacts on antiviral immunity. Future directions include covalent or macrocyclic wedges, degrader hybrids, and adaptive pulse\u2010dose regimens guided by proximity\u2010ligation assays. Collectively, chemical disarming of the Hsp70\u2013Bim alliance exemplifies how precision targeting of chaperone PPIs can recalibrate apoptotic thresholds and unlock new therapeutic space in oncology.<\/jats:p>","DOI":"10.1002\/open.202500479","type":"journal-article","created":{"date-parts":[[2025,12,13]],"date-time":"2025-12-13T00:54:02Z","timestamp":1765587242000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Disarming the Hsp70\u2013Bim Alliance: Small\u2010Molecule and Peptidic Disruptors of a Chaperone\u2010Apoptotic Switch in Cancer"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1279-9564","authenticated-orcid":false,"given":"Emadeldin M.","family":"Kamel","sequence":"first","affiliation":[{"name":"Chemistry Department Faculty of Science Beni\u2010Suef University  Beni\u2010Suef Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohammed","family":"Al\u2010zharani","sequence":"additional","affiliation":[{"name":"Department of Biology College of Science Imam Mohammad Ibn Saud Islamic University (IMSIU)  Riyadh Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lina M.","family":"Alneghery","sequence":"additional","affiliation":[{"name":"Department of Biology College of Science Imam Mohammad Ibn Saud Islamic University (IMSIU)  Riyadh Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Noha A.","family":"Ahmed","sequence":"additional","affiliation":[{"name":"Physiology Division Zoology Department Faculty of Science Beni\u2010Suef University  Beni\u2010Suef Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Faris F. Aba","family":"Alkhayl","sequence":"additional","affiliation":[{"name":"Department of Medical Laboratories College of Applied Medical Sciences Qassim University  Buraydah Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Al Mokhtar","family":"Lamsabhi","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica and Institute for advanced research in chemical Science (IAdChem) Facultad de Ciencias, M\u00f3dulo 13 Universidad Aut\u00f3noma de Madrid   Madrid 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