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

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

Cell chemical biology (2019-12-31)
Paul Yenerall, Amit K Das, Shan Wang, Rahul K Kollipara, Long Shan Li, Pamela Villalobos, Josiah Flaming, Yu-Fen Lin, Kenneth Huffman, Brenda C Timmons, Collin Gilbreath, Rajni Sonavane, Lisa N Kinch, Jaime Rodriguez-Canales, Cesar Moran, Carmen Behrens, Makoto Hirasawa, Takehiko Takata, Ryo Murakami, Koichi Iwanaga, Benjamin P C Chen, Nick V Grishin, Ganesh V Raj, Ignacio I Wistuba, John D Minna, Ralf Kittler
ABSTRACT

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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