PH-Dependent Assembly and Segregation of the Coiled-Coil Segments of Yeast Putative Cargo Receptors Emp46p and Emp47p.

ABSTRACT: Emp46p and Emp47p are yeast putative cargo receptors that recycle between the endoplasmic reticulum and the Golgi apparatus. These receptors can form complexes in a pH-dependent manner, but their molecular mechanisms remain unclear. Here, we successfully reproduced their interactions in vitro solely with their coiled-coil segments, which form stable heterotetramers in the neutral condition but segregate at lower pH. Mutational data identified a key glutamate residue of Emp46p that serves as the pH-sensing switch of their oligomer formation. Our findings elucidate the mechanisms of the dynamic cargo receptor interactions in the secretory pathway and the design framework of the environment-responsive molecular assembly and disassembly systems.

SUBMITTER: Ishii K 

PROVIDER: S-EPMC4598028 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature