RUVBL1/RUVBL2 ATPase Activity Drives PAQosome Maturation, DNA Replication and Radioresistance in Lung Cancer

Published on Jan 16, 2020in Chemistry & Biology2.244
· DOI :10.1016/J.CHEMBIOL.2019.12.005
Paul Yenerall6
Estimated H-index: 6
(UTSW: University of Texas Southwestern Medical Center),
Amit K. Das11
Estimated H-index: 11
(UTSW: University of Texas Southwestern Medical Center)
+ 23 AuthorsRalf Kittler32
Estimated H-index: 32
(UTSW: University of Texas Southwestern Medical Center)
Summary RUVBL1 and RUVBL2 (collectively RUVBL1/2) are essential AAA+ ATPases that function as co-chaperones and have been implicated in cancer. Here we investigated the molecular and phenotypic role of RUVBL1/2 ATPase activity in non-small cell lung cancer (NSCLC). We find that RUVBL1/2 are overexpressed in NSCLC patient tumors, with high expression associated with poor survival. Utilizing a specific inhibitor of RUVBL1/2 ATPase activity, we show that RUVBL1/2 ATPase activity is necessary for the maturation or dissociation of the PAQosome, a large RUVBL1/2-dependent multiprotein complex. We also show that RUVBL1/2 have roles in DNA replication, as inhibition of its ATPase activity can cause S-phase arrest, which culminates in cancer cell death via replication catastrophe. While in vivo pharmacological inhibition of RUVBL1/2 results in modest antitumor activity, it synergizes with radiation in NSCLC, but not normal cells, an attractive property for future preclinical development.
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