Questions? Comments? Please contact Dr. Phillip McClean or Christina Johnson.

OVERVIEW
Flythrough Tour
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MOLECULAR PROCESSES
Transcription
Regulated Transcription
mRNA Processing
mRNA Splicing
Translation
Lac Operon
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CELLULAR PROCESSES
Protein Trafficking
Protein Modification
Protein Recycling
Insulin Signaling
Constitutive Secretion
Regulated Secretion
Mitochondrial Protein Transport
Mitosis
Meiosis
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CELLULAR ENERGY CONVERSION
Atp Synthase (Gradients)
Electron Transport Chain
Photosynthesis (Light Reaction)
Photosystem II
Glycolysis (Overview)
Glycolysis (Reactions)
Citric Acid Cycle (Overview)
Citric Acid Cycle (Reactions)
Energy Consumption
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HOME > PHOTOSYNTHESIS > ADVANCED LOOK > 1.) MODIFICATION > 2.) TRANSPORT
Protein Trafficking (Golgi): Advanced Look --> 2.) Transport

Proteins must be transported through the Golgi, as well as away from the Golgi to their final locations. Clicking on each of the thumbnail images will bring up a larger, labeled version of the described scene.

To see the Flash movie for the following sequence of images, click here.

According to the cis maturation model, the proteins are transported through the Golgi stack as the cisterna containing them migrate, or mature, in a cis-to-trans direction. New vesicles from the ER continually supply new cis cisterna as trans Golgi network vesicles mature.

Within the trans Golgi network, proteins are sorted by their final destinations. This is accomplished by receptor molecules embeddedin the membrane of the TGN.

When proteins have reached their correct location within the TGN, the membrane at those locations buds off into vesicles. More than one protein can be contained within each transport vesicle.

Once released, the vesicles carry their cargo proteins to a final location. Possible destinations include the lysosome, the digestive organelle of the cell, and the plasma membrane, where the proteins can be released elsewhere in the organism.

 

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