Protein molecules situated in the outer membrane of bacteria that, in dimeric or trimeric form, constitute a water-filled transmembrane channel allowing passage of ions and other small, relatively non-specific molecules. Porins are also found in mitochondria and plants. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
Transmembrane matrix proteins (37 kD) found in the outer membranes of Gram positive bacteria. Associate as trimers to form channels (1nm diameter, ca 105 per bacterium) through which hydrophilic molecules of up to 600D can pass. Similar porins are also found in outer mitochondrial membranes (VDAC, voltage-dependent anion-selective channel).
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Type: Term Pronunciation: pōr′inz Definitions: 1. Proteins found in the outer membrane of a double membrane that allow permeability in most small molecules.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=71210
No exact match found.
