Membrane Proteins

[stopfeedingplease]

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Hi,

I've seen this question answered before, but I'm still confused lol.

So, whats the difference between Transport Protein vs. Channel Protein vs. Porin vs Carrier Protein

What I'm thinking right now is:

Porin - Not very specific facilitated diffusion of ions/polar molecules
Channel Protein - Specific facilitated diffusion of ions/polar/large molecules
Transport Protein - Can be either facilitated or active transport of a specific molecule (sort of like a channel protein)
Carrier Protein - Can be facilitate or active transport of a specific molecule - but uses a change of shape mechanism after binding of the molecule.


I'm using Cliffs 3e, but its not very clear about the distinction between all these proteins.

Thank you

 

[deleted678432]

Not 100% sure but from what I understand, transport proteins are active and carriers are facilitated. Think of an ATPase when you think of transport proteins and one of those revolving doors for carrier proteins.


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[DAT Destroyer]

Hi,

I've seen this question answered before, but I'm still confused lol.

So, whats the difference between Transport Protein vs. Channel Protein vs. Porin vs Carrier Protein

What I'm thinking right now is:

Porin - Not very specific facilitated diffusion of ions/polar molecules
Channel Protein - Specific facilitated diffusion of ions/polar/large molecules
Transport Protein - Can be either facilitated or active transport of a specific molecule (sort of like a channel protein)
Carrier Protein - Can be facilitate or active transport of a specific molecule - but uses a change of shape mechanism after binding of the molecule.


I'm using Cliffs 3e, but its not very clear about the distinction between all these proteins.

Thank you

Transport protein and carrier protein are basically the same thing. They must be able to bind to the ligand that they transport and change their confirmation. Channel and porin are very similar. They do not get saturated (unlike carriers) they just provide passage for certain molecules to get through the bilayer (like tunnels).

Hope this helps