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9 votes
Accepted

What determines the direction in which motor proteins go?

While you're entirely correct that the ABABAB sequence is symmetric to a motor protein cruising along, the individual $\alpha$ and $\beta$ monomers themselves are not symmetric along the axis of ...
Dubukay's user avatar
  • 808
7 votes

How do cells relocate transmembrane proteins from one side of the cell to the other? Is it possible?

The breakdown and reassembly of proteins is a ubiquitous process within cells, and yes this is expensive but transport is expensive, too, and recycling has the added benefit of dealing with proteins ...
Bryan Krause's user avatar
  • 46k
5 votes
Accepted

How do cells relocate transmembrane proteins from one side of the cell to the other? Is it possible?

Transmembrane proteins can move laterally through the plasma membrane (see fluid mosaic model) and this movement can be actively directed along the cytoskeleton. The following paper is the most ...
canadianer's user avatar
  • 17.8k
2 votes
Accepted

Why is GTP, rather than ATP, used in nuclear transport?

Disclaimer Although this question appears to be either unclear or unanswerable (or both), and shows no evidence of research on the poster’s part, I have chosen to address one aspect of it to ...
David's user avatar
  • 26k
2 votes
Accepted

COPI/COPII proteins and kinesins/dyneins

Interesting question. The term anterograde refers to movement in the forward direction. In the context of vesicular trafficking, anterograde refers to (1) movement from the site of protein synthesis ...
canadianer's user avatar
  • 17.8k
2 votes
Accepted

Why do large neurotransmitters travel faster down the axon?

I presume you are referring to fast versus slow axoplasmic transport. I presume by "small neurotransmitters," you are referring to "small molecule" neurotransmitters like GABA, glutamate, ...
Bryan Krause's user avatar
  • 46k
2 votes

Transport mechanism in absorption of monosaccharides in small intestine

From my initial reading on this, the SGLT1 does not itself directly use energy in the form of ATP. https://en.wikipedia.org/wiki/Sodium-glucose_transport_proteins It appears the uptake of the sugars ...
bpedit's user avatar
  • 1,351
1 vote

Does cytoplasmic streaming cause passive organelle movement in animal or fungi cells?

If you look at http://en.wikipedia.org/wiki/Melanosome you will see an example of this organelle being transported in animal cells. Is this what you mean? or are you looking for unbound organelles ...
Polypipe Wrangler's user avatar
1 vote
Accepted

Does cytoplasmic streaming cause passive organelle movement in animal or fungi cells?

I believe that fungi use cytoplasmic streaming to transport organelles to the tips of their hyphae to extend them. I haven't heard of cytoplasmic streaming in animal cells but it might exist.
selenocysteine's user avatar
1 vote

When are neuropeptides loaded into vesicles?

Neuropeptides are packaged in the soma via the Golgi into dense core vesicles, similar to how other types of secreted proteins are packaged. These vesicles are transported to axon terminals where ...
Bryan Krause's user avatar
  • 46k
1 vote

Moss Transportation System

Mosses are able to transport water and nutrients internally through intercellular voids and cell-to-cell connections involving exchanges of cytoplasm, as well as externally across their surface. ...
Estnussius's user avatar

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