Sugar-Recognizing Ubiquitin Ligases: Action Mechanisms and Physiology.

ABSTRACT: F-box proteins, the substrate recognition subunits of SKP1-CUL1-F-box protein (SCF) E3 ubiquitin ligase complexes, play crucial roles in various cellular events mediated by ubiquitination. Several sugar-recognizing F-box proteins exist in both mammalian and plant cells. Although glycoproteins generally reside outside of cells, or in organelles of the secretory pathway, these lectin-type F-box proteins reside in the nucleocytoplasmic compartment. Mammalian sugar-recognizing F-box proteins commonly bind to the innermost position of N-glycans through a unique small hydrophobic pocket in their loops. Two cytosolic F-box proteins, Fbs1 and Fbs2, recognize high-mannose glycans synthesized in the ER, and SCFFbs1 and SCFFbs2 ubiquitinate excess unassembled or misfolded glycoproteins in the ERAD pa

SUBMITTER: Yoshida Y 

PROVIDER: S-EPMC6389600 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature