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10 Cards in this Set
- Front
- Back
advantages of memebrane
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-increased area to host biochemical reactions
-enclose compartments from the cytosol -most things impermeable therefore transport mechanism needed |
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cytoplasm
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cytosol and cytosolic organelles
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cytosol
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site of protein synthesis and degradation
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four distinct organelle families
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-nucleus and cytosol
-secretory and endocytic pathways -mitochondria -plastids (plants only) |
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sorting signal
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short amino acid sequence the directs delivery to locations outside cytosol
lacking sorting signal remains in cytosol |
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three ways proteins move from compartments
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-gated transport, selective gates
-transmembrane transport, protein translocators through topologically distinct -vesicular transport, can move only proteins between topo. equivalent due to not crossing membrane and only moving through compartments |
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sorting receptors
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recognize complimentory sorting signals, guide proteins to their correct destination and return to origin to be reused
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signal sequences
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specific stretch of amino acids that serve as sorting signals, normally found on N terminus
or can be internal and thus remain part of protein specifies specific destination within the cell |
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signal peptidases
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remove signal sequence from the finished protein once the sorting process is complete
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signal patch
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signal sequence created by the internal amino acids creating a three dimensional signal
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