Plant and yeast cornichon possess a conserved acidic motif required for correct targeting of plasma membrane cargos

Publication date: Available online 16 July 2017
Source:Biochimica et Biophysica Acta (BBA) - Molecular Cell Research
Author(s): Paul Rosas-Santiago, Daniel Lagunas-Gomez, Carolina Yáñez-Domínguez, Rosario Vera-Estrella, Olga Zimmermannova, Hana Sychrová, Omar Pantoja
The export of membrane proteins along the secretory pathway is initiated at the endoplasmic reticulum after proteins are folded and packaged inside this organelle by their recruiting into the coat complex COPII vesicles. It is proposed that cargo receptors are required for the correct transport of proteins to its target membrane, however, little is known about ER export signals for cargo receptors. Erv14/Cornichon belong to a well conserved protein family in Eukaryotes, and have been proposed to function as cargo receptors for many transmembrane proteins. Amino acid sequence alignment showed the presence of a conserved acidic motif in the C-terminal in homologues from plants and yeast. Here, we demonstrate that mutation of the C-terminal acidic motif from ScErv14 or OsCNIH1, did not alter the localization of these cargo receptors, however it modified the proper targeting of the plasma membrane transporters Nha1p, Pdr12p and Qdr2p. Our results suggest that mistargeting of these plasma membrane proteins is a consequence of a weaker interaction between the cargo receptor and cargo proteins caused by the mutation of the C-terminal acidic motif.

Graphical abstract

from # All Medicine by Alexandros G. Sfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2v8gIlH
via IFTTT