BIO130H1 Lecture Notes - Lecture 18: Secretion, Nuclear Pore, Peroxisome
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BIO130H1 Full Course Notes
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Gated (cytosol nucleus: proteins move between the cytosol and nucleus through npcs (nuclear pore complexes, 2. Transmembrane (cytosol mitochondria, er, plastids, peroxisomes: translocation protein needed to transport specific proteins across a membrane, 3. Vesicular (look at green arrows: membrane-enclosed transport vesicle ferry proteins from one compartment to another. Signal sequences are recognized by sorting receptors that take proteins to their destination. Path of transmembrane protein from translation to plasma membrane: cytosol er, translocation into er membrane, requires a signal sequence, orientation will not change. If n-terminus faces lumen and c-terminus faces cytosol, it will stay consistent (same for golgi and cell membrane: still apart of endomembrane system, er golgi, golgi pm. Imagine starting in cytosol: ribosomes bind to mrna and makes protein (n-terminus, makes more and then makes internal signal sequence which are hydrophobic) N-terminal side will flip out so it faces cytosol. White is charge of translocon; black is sequences around alpha helix.