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Sorting nexin 6 interacts with Cullin3 and regulates programmed death ligand 1 expression.


ABSTRACT: Programmed death ligand 1 (PD-L1) is critical for the ability of cancer cells to evade attacks by the host immune system. However, the molecular mechanisms controlling PD-L1 expression have not been fully understood. Here, we demonstrate that sorting nexin 6 (SNX6) is a novel regulator of PD-L1 expression. Knockdown of SNX6 in cancer cells significantly decreases PD-L1 protein levels. In contrast, loss of SNX6 does not reduce PD-L1 mRNA levels. Instead, SNX6 interacts with Cullin3, an E3 ubiquitin ligase responsible for PD-L1 ubiquitination and subsequent degradation. By binding with Cullin3, SNX6 decreases the interaction between the adaptor protein speckle-type POZ protein and Cullin3, which in turn downregulates Cullin3-mediated PD-L1 ubiquitination. This research reveals a novel molecular nexus in modulating PD-L1.

SUBMITTER: Ghosh C 

PROVIDER: S-EPMC8545913 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature

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Sorting nexin 6 interacts with Cullin3 and regulates programmed death ligand 1 expression.

Ghosh Chinmoy C   Xing Yanli Y   Li Suhua S   Hoyle Rosalie G RG   Sun Ming M   Li Jiong J   Sun Yue Y  

FEBS letters 20210919 20


Programmed death ligand 1 (PD-L1) is critical for the ability of cancer cells to evade attacks by the host immune system. However, the molecular mechanisms controlling PD-L1 expression have not been fully understood. Here, we demonstrate that sorting nexin 6 (SNX6) is a novel regulator of PD-L1 expression. Knockdown of SNX6 in cancer cells significantly decreases PD-L1 protein levels. In contrast, loss of SNX6 does not reduce PD-L1 mRNA levels. Instead, SNX6 interacts with Cullin3, an E3 ubiquit  ...[more]

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