Inactivation of Ribosomal Protein S27-like Impairs DNA Interstrand Cross-link Repair by Destabilization of FANCD2 and FANCI

Overview

Journal Cell Death Dis

Specialties Cell Biology
General Medicine

Date 2020 Oct 14

PMID 33051438

Citations 5

Authors

Siyuan Sun

Hengqian He

Yuanyuan Ma

Jie Xu

Guoan Chen

Yi Sun

Xiufang Xiong

Affiliations

Soon will be listed here.

Abstract

Ribosomal protein S27-like (RPS27L), an evolutionarily conserved ribosomal protein and a direct p53 target, plays an important role in maintenance of genome integrity. We have previously reported that RPS27L regulates radiation sensitivity via the MDM2-p53 and MDM2-MRN-ATM axes. Whether and how RPS27L modulates DNA interstrand cross-link (ICL) repair is unknown. Here we identified that RPS27L binds to FANCD2 and FANCI, two Fanconi anemia (FA) proteins functioning in ICL repair pathway. Upon RPS27L knockdown, the levels of FANCD2 and FANCI are reduced due to accelerated degradation via p62-mediated autophagy-lysosome pathway, which is abrogated by chloroquine (CQ) treatment or Beclin 1 knockdown. Biologically, RPS27L knockdown suppresses FANCD2 foci formation and impairs ICL repair upon exposure to ICL-inducing agent mitomycin C (MMC) in lung cancer cells. This effect of MMC sensitization can be partially reversed by CQ treatment. Together, our study shows that RPS27L positively regulates ICL repair by binding with FANCD2 and FANCI to prevent their degradation via autophagy-lysosome system.

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