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Any of a class of proteins whose molecules can form channels (large enough to allow the passage of small ions and molecules) through cellular membranes.
- ‘These molecular sieving properties are due to a major class of proteins called porins that form trimeric channels in the outer membrane.’
- ‘Bacterial outer membrane porins are classified into channels specific for the uptake of nutrients, such as maltose or sucrose, and unspecific pore proteins.’
- ‘This function is accomplished by a number of membrane channel proteins called porins, which display a wide range of permeability profiles.’
- ‘Extramembranous loops are crucial in regulating the activity of TonB-dependent receptors and other outer membrane proteins such as porins, by providing suitable sites for substrate recognition, selectivity, or binding.’
- ‘It functions as an anion-selective porin allowing the passage of small molecules through the outer membrane.’
1970s: from Greek poros pore + -in.
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