8S9S

Structure of the human ER membrane protein complex (EMC) in GDN

This is a non-PDB format compatible entry.

Summary for 8S9S

• Entry DOI: 10.2210/pdb8s9s/pdb
• EMDB information: 40245
• Descriptor: ER membrane protein complex subunit 1, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (12 entities in total)
• Functional Keywords: insertase, endoplasmic reticulum, transmembrane chaperone, membrane protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 9
• Total formula weight: 307492.80

Authors

Tomaleri, G.P.,Nguyen, V.N.,Voorhees, R.M. (deposition date: 2023-03-30, release date: 2023-05-17, Last modification date: 2023-06-14)

Primary citation

Pleiner, T.,Hazu, M.,Pinton Tomaleri, G.,Nguyen, V.N.,Januszyk, K.,Voorhees, R.M.
A selectivity filter in the ER membrane protein complex limits protein misinsertion at the ER.
J.Cell Biol., 222:-, 2023

PubMed Abstract: Tail-anchored (TA) proteins play essential roles in mammalian cells, and their accurate localization is critical for proteostasis. Biophysical similarities lead to mistargeting of mitochondrial TA proteins to the ER, where they are delivered to the insertase, the ER membrane protein complex (EMC). Leveraging an improved structural model of the human EMC, we used mutagenesis and site-specific crosslinking to map the path of a TA protein from its cytosolic capture by methionine-rich loops to its membrane insertion through a hydrophilic vestibule. Positively charged residues at the entrance to the vestibule function as a selectivity filter that uses charge-repulsion to reject mitochondrial TA proteins. Similarly, this selectivity filter retains the positively charged soluble domains of multipass substrates in the cytosol, thereby ensuring they adopt the correct topology and enforcing the "positive-inside" rule. Substrate discrimination by the EMC provides a biochemical explanation for one role of charge in TA protein sorting and protects compartment integrity by limiting protein misinsertion.

PubMed: 37199759
DOI: 10.1083/jcb.202212007

Experimental method

ELECTRON MICROSCOPY (3.6 Å)