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Structure paper

TitleStructural and mechanistic basis of the EMC-dependent biogenesis of distinct transmembrane clients.
Journal, issue, pagesElife, Vol. 9, Year 2020
Publish dateNov 25, 2020
AuthorsLakshmi E Miller-Vedam / Bastian Bräuning / Katerina D Popova / Nicole T Schirle Oakdale / Jessica L Bonnar / Jesuraj R Prabu / Elizabeth A Boydston / Natalia Sevillano / Matthew J Shurtleff / Robert M Stroud / Charles S Craik / Brenda A Schulman / Adam Frost / Jonathan S Weissman /
PubMed AbstractMembrane protein biogenesis in the endoplasmic reticulum (ER) is complex and failure-prone. The ER membrane protein complex (EMC), comprising eight conserved subunits, has emerged as a central player ...Membrane protein biogenesis in the endoplasmic reticulum (ER) is complex and failure-prone. The ER membrane protein complex (EMC), comprising eight conserved subunits, has emerged as a central player in this process. Yet, we have limited understanding of how EMC enables insertion and integrity of diverse clients, from tail-anchored to polytopic transmembrane proteins. Here, yeast and human EMC cryo-EM structures reveal conserved intricate assemblies and human-specific features associated with pathologies. Structure-based functional studies distinguish between two separable EMC activities, as an insertase regulating tail-anchored protein levels and a broader role in polytopic membrane protein biogenesis. These depend on mechanistically coupled yet spatially distinct regions including two lipid-accessible membrane cavities which confer client-specific regulation, and a non-insertase EMC function mediated by the EMC lumenal domain. Our studies illuminate the structural and mechanistic basis of EMC's multifunctionality and point to its role in differentially regulating the biogenesis of distinct client protein classes.
External linksElife / PubMed:33236988 / PubMed Central
MethodsEM (single particle)
Resolution3.2 - 4.3 Å
Structure data

11732

7ado

EMDB-11732, PDB-7ado:
Cryo-EM structure of human ER membrane protein complex in lipid nanodiscs
Method: EM (single particle) / Resolution: 3.39 Å

11733

7adp

EMDB-11733, PDB-7adp:
Cryo-EM structure of human ER membrane protein complex in GDN detergent
Method: EM (single particle) / Resolution: 3.6 Å

23003

7kra

EMDB-23003, PDB-7kra:
Cryo-EM structure of Saccharomyces cerevisiae ER membrane protein complex bound to Fab-DH4 in lipid nanodiscs
Method: EM (single particle) / Resolution: 3.2 Å

23033

7ktx

EMDB-23033, PDB-7ktx:
Cryo-EM structure of Saccharomyces cerevisiae ER membrane protein complex bound to a Fab in DDM detergent
Method: EM (single particle) / Resolution: 4.3 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine

ChemComp-PCW:
1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / DOPC, phospholipid*YM

ChemComp-X3P:
[(2~{R})-1-octanoyloxy-3-[oxidanyl-[2-(trimethyl-$l^{4}-azanyl)ethoxy]phosphoryl]oxy-propan-2-yl] nonanoate

Source
  • homo sapiens (human)
  • saccharomyces cerevisiae (brewer's yeast)
  • Baker's yeast (brewer's yeast)
  • saccharomyces cerevisiae by4743 (yeast)
KeywordsMEMBRANE PROTEIN / ER membrane protein / EMC / Membrane protein biogenesis / MEMBRANE PROTEIN/IMMUNE SYSTEM / ER membrane protein complex / insertase / chaperone / endoplasmic / reticulum / MEMBRANE PROTEIN-IMMUNE SYSTEM complex

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