Phosphorylation-coupled autoregulation of TANGO1 and Sec16A maintains functional ER exit sites.

ABSTRACT: Secretory proteins are synthesized in the endoplasmic reticulum (ER) and begin their transport from specialized domains on the ER called ER exit sites (ERES), where COPII proteins assemble. We previously demonstrated that the interaction between TANGO1 and Sec16A is critical for ERES formation. In this study, we reveal that the phosphorylation of TANGO1 and Sec16A is regulated by a FAM83A/CK1α-mediated negative feedback loop. Conversely, their dephosphorylation is regulated in a spatially distinct manner by different phosphatase complexes: PPP6R3/PPP6C for Sec16A and PPP1R15B/PPP1C for TANGO1. Excessive phosphorylation of either TANGO1 or Sec16A leads to ERES disassembly, while excessive dephosphorylation impairs secretion. Our findings demonstrate that maintaining a balanced phosphorylati

SUBMITTER: Maeda M 

PROVIDER: S-EPMC12647149 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature