Protein: ER membrane protein complex subunit 4 (P53073)
Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast)
Function: Part of the endoplasmic reticulum membrane protein complex (EMC) that enables the energy-independent insertion into endoplasmic reticulum membranes of newly synthesized membrane proteins. Preferentially accommodates proteins with transmembrane domains that are weakly hydrophobic or contain destabilizing features such as charged and aromatic residues. Involved in the cotranslational insertion of multi-pass membrane proteins in which stop-transfer membrane-anchor sequences become ER membrane spanning helices. It is also required for the post-translational insertion of tail-anchored/TA proteins in endoplasmic reticulum membranes. By mediating the proper cotranslational insertion of N-terminal transmembrane domains in an N-exo topology, with translocated N-terminus in the lumen of the ER, controls the topology of multi-pass membrane proteins (By similarity).
Subcellular location: Endoplasmic reticulum membrane {ECO:0000269|PubMed:14562095}; Multi-pass membrane protein {ECO:0000269|PubMed:14562095}.
Sequence: MSEQEPYEWAKHLLDTKYIEKYNIQNSNTLPSPPGFEGNSSKGNVTRKQQDATSQTTSLAQKNQITVLQVQKAWQIALQPAKSIPMNIFMSYMSGTSLQIIPIMTALMLLSGPIKAIFSTRSAFKPVLGNKATQSQVQTAMFMYIVFQGVLMYIGYRKLNSMGLIPNAKGDWLPWERIAHYNNGLQWFSD
InterPro domains: - IPR009445: ER membrane protein complex subunit 4 (family) [1-190]
Interaction partners: - ER membrane protein complex subunit 5
- ER membrane protein complex subunit 6
- ER membrane protein complex subunit 2
- ER membrane protein complex subunit 1
- ER membrane protein complex subunit 3
- Vacuolar protein sorting-associated protein 28
- Ubiquitin-conjugating enzyme E2 7
- Endoplasmic reticulum membrane protein complex subunit 10
- Protein SOP4
- Uncharacterized protein YGL230C
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0140104 (molecular carrier activity), GO:0005488 (binding), GO:0140597 (protein carrier chaperone), GO:0005515 (protein binding), GO:0032977 (membrane insertase activity)
Biological Process (BP): GO:0008150 (biological process), GO:0009987 (cellular process), GO:0051179 (localization), GO:0051234 (establishment of localization), GO:0051641 (cellular localization), GO:0071840 (cellular component organization or biogenesis), GO:0033036 (macromolecule localization), GO:0070727 (cellular macromolecule localization), GO:0016043 (cellular component organization), GO:0051668 (localization within membrane), GO:0045184 (establishment of protein localization), GO:0008104 (protein localization), GO:0006996 (organelle organization), GO:0010256 (endomembrane system organization), GO:0090150 (establishment of protein localization to membrane), GO:0061024 (membrane organization), GO:0072657 (protein localization to membrane), GO:0051205 (protein insertion into membrane), GO:0033365 (protein localization to organelle), GO:0007029 (endoplasmic reticulum organization), GO:0045048 (protein insertion into ER membrane)
Cellular Component (CC): GO:0005575 (cellular component), GO:0032991 (protein-containing complex), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0140534 (endoplasmic reticulum protein-containing complex), GO:0016020 (membrane), GO:0005737 (cytoplasm), GO:0098796 (membrane protein complex), GO:0012505 (endomembrane system), GO:0031984 (organelle subcompartment), GO:0042175 (nuclear outer membrane-endoplasmic reticulum membrane network), GO:0031090 (organelle membrane), GO:0005783 (endoplasmic reticulum), GO:0043229 (intracellular organelle), GO:0043227 (membrane-bounded organelle), GO:0098827 (endoplasmic reticulum subcompartment), GO:0043231 (intracellular membrane-bounded organelle), GO:0005789 (endoplasmic reticulum membrane)