Protein transport across the endoplasmic reticulum membrane.
A decisive step in the biosynthesis of many eukaryotic proteins is their partial or complete translocation across the endoplasmic reticulum membrane. A similar process occurs in prokaryotes, except that proteins are transported across or are integrated into the plasma membrane. In both cases, translocation occurs through a protein-conducting channel that is formed from a conserved, heterotrimeric membrane protein complex, the Sec61 or SecY complex. Structural and biochemical data suggest mechanisms that enable the channel to function with different partners, to open across the membrane and to release laterally hydrophobic segments of membrane proteins into lipid.
Rapoport
Tom A
TA
Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA. tom_rapoport@hms.harvard.edu
D000251:Adenosine Triphosphatases / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism; D002463:Cell Membrane Permeability; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D007425:Intracellular Membranes / Q000378:metabolism*; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism; D026901:Membrane Transport Proteins / Q000737:chemistry* / Q000378:metabolism; D014176:Protein Biosynthesis; D021381:Protein Transport; D000069816:SEC Translocation Channels; D000081416:SecA Proteins
D001426:Bacterial Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D000069816:SEC Translocation Channels; D000251:Adenosine Triphosphatases; D000081416:SecA Proteins