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From Proteopedia
B28 in complex with CRM1-Ran-RanBP1
Structural highlights
FunctionRAN_HUMAN GTP-binding protein involved in nucleocytoplasmic transport. Required for the import of protein into the nucleus and also for RNA export. Involved in chromatin condensation and control of cell cycle (By similarity). The complex with BIRC5/ survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2.[1] [2] [3] [4] Enhances AR-mediated transactivation. Transactivation decreases as the poly-Gln length within AR increases.[5] [6] [7] [8] Publication Abstract from PubMedProtein localization is frequently manipulated to favor tumor initiation and progression. In cancer cells, the nuclear export factor CRM1 is often overexpressed and aberrantly localizes many tumor suppressors via protein-protein interactions. Although targeting protein-protein interactions is usually challenging, covalent inhibitors, including the FDA-approved drug KPT-330 (selinexor), were successfully developed. The development of noncovalent CRM1 inhibitors remains scarce. Here, by shifting the side chain of two methionine residues and virtually screening against a large compound library, we successfully identified a series of noncovalent CRM1 inhibitors with a stable scaffold. Crystal structures of inhibitor-protein complexes revealed that one of the compounds, B28, utilized a deeply hidden protein interior cavity for binding. SAR analysis guided the development of several B28 derivatives with enhanced inhibition on nuclear export and growth of multiple cancer cell lines. This work may benefit the development of new CRM1-targeted therapies. Discovery of a Hidden Pocket beneath the NES Groove by Novel Noncovalent CRM1 Inhibitors.,Li C, Zhang Q, Huang W, Huang L, Long Q, Lei Y, Jia D, Yang S, Yang Y, Zhang X, Sun Q J Med Chem. 2023 Dec 28;66(24):17044-17058. doi: 10.1021/acs.jmedchem.3c01867. , Epub 2023 Dec 18. PMID:38105606[9] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. Loading citation details.. Citations No citations found References
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