WHAT ARE PORINS.WAHT IS IT FUNCTON
Porins are beta barrel proteins that cross a cellular membrane and act as a pore through which molecules can diffuse. Unlike other membrane transport proteins, porins are large enough to allow passive diffusion, i.e., they act as channels that are specific to different types of molecules. They are present in the outer membrane of Gram-negative bacteria and some Gram-positive bacteria of the group Mycolata, the mitochondria, and the chloroplast.
Porin is one of the most ABUNDANT POLYPEPTIDES. It forms channels that allow for the diffusion of solutes. It is different from other 'membrane transport proteins', and large enough to allow passive diffusion. Porins are proteins (beta barrel proteins) that form huge pores in the outer membranes of plastids, mitochondria and some bacteria (gram-negative bacteria, gram-positive bacteria) allowing molecules up to the size of small proteins to pass through.
Hope you like the answer HARSH SHARMA
Porins are those that are present in outer membranes of cell organelles like Mitochondria and others. They are responsible for intracellular transport of materials.
Aquaporins,on the other hand are present in cell membrane of cells. They are responsible for intercellular transport of materials.