UFMylation orchestrates spatiotemporal coordination of RQC at the ER.

ABSTRACT: Degradation of arrest peptides from endoplasmic reticulum (ER) translocon-bound 60S ribosomal subunits via the ribosome-associated quality control (ER-RQC) pathway requires covalent modification of RPL26/uL24 on 60S ribosomal subunits with UFM1. However, the underlying mechanism that coordinates the UFMylation and RQC pathways remains elusive. Structural analysis of ER-RQC intermediates revealed concomitant binding and direct interaction of the UFMylation and RQC machineries on the 60S. In the presence of an arrested peptidyl-transfer RNA, the RQC factor NEMF and the UFM1 E3 ligase (E3^UFM1) form a direct interaction via the UFL1 subunit of E3^UFM1, and UFL1 adopts a conformation distinct from that previously observed for posttermination 60S.

SUBMITTER: Penchev I 

PROVIDER: S-EPMC12047416 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature