porin(redirected from Porin (disambiguation))
porin(pŏr′ĭn) [Gr. poros, passageway]
A channel-forming protein in cell membranes that facilitates the diffusion of water and small molecules in and out of the cell.
Medical Dictionary, © 2009 Farlex and Partners
porina protein in the outer MEMBRANE of Gram-negative BACTERIA (see GRAM'S STAIN that allows the passage of small polar molecules across the membrane. The concentration gradient of each transported commodity is used to drive its movement through the membrane.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005