2026-05-22T11:08:15Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/78382024-11-29T14:37:17Zcom_20.500.12105_2173com_20.500.12105_2051col_20.500.12105_19597

00925njm 22002777a 4500 dc Muñoz-Hernández, Hugo author Pal, Mohinder author Rodríguez, Carlos F author Fernandez-Leiro, Rafael author Prodromou, Chrisostomos author Pearl, Laurence H author Llorca Blanco, Oscar Antonio author Muñoz-Hernández, Hugo author Pal, Mohinder author Rodríguez, Carlos F author Fernandez-Leiro, Rafael author Prodromou, Chrisostomos author Pearl, Laurence H author 2019-05 The human R2TP complex (RUVBL1-RUVBL2-RPAP3-PIH1D1) is an HSP90 co-chaperone required for the maturation of several essential multiprotein complexes, including RNA polymerase II, small nucleolar ribonucleoproteins, and PIKK complexes such as mTORC1 and ATR-ATRIP. RUVBL1-RUVBL2 AAA-ATPases are also primary components of other essential complexes such as INO80 and Tip60 remodelers. Despite recent efforts, the molecular mechanisms regulating RUVBL1-RUVBL2 in these complexes remain elusive. Here, we report cryo-EM structures of R2TP and show how access to the nucleotide-binding site of RUVBL2 is coupled to binding of the client recruitment component of R2TP (PIH1D1) to its DII domain. This interaction induces conformational rearrangements that lead to the destabilization of an N-terminal segment of RUVBL2 that acts as a gatekeeper to nucleotide exchange. This mechanism couples protein-induced motions of the DII domains with accessibility of the nucleotide-binding site in RUVBL1-RUVBL2, and it is likely a general mechanism shared with other RUVBL1-RUVBL2-containing complexes. Sci Adv. 2019;5(5):eaaw1616. 10.1126/sciadv.aaw1616 2375-2548 2375-2548 Science advances 31049401 http://hdl.handle.net/20.500.12105/7838 HSP90 MTOR COMPLEX TEL2 DOMAIN BINDING COCHAPERONE Structural mechanism for regulation of the AAA-ATPases RUVBL1-RUVBL2 in the R2TP co-chaperone revealed by cryo-EM