permeasen.
/ˈpəːmɪeɪz/, U.S. /ˈpərmiˌeɪz/, /ˈpərmiˌeɪs/ Biochemistry.
An enzyme which assists the passage of a substrate into a cell through the cell membrane.
ΚΠ
1957 Bacteriol. Rev. 21 169/1 During the past few years, however, definite proof of the existence, in bacteria, of stereospecific permeation systems, functionally specialized and distinct from metabolic enzymes, has been obtained... The generic name ‘permeases’ has been suggested for these systems.
1975 D. V. Parke Enzyme Induction i. 7 Maltase and maltose permease are induced together by maltose in yeast.
1989 B. Alberts et al. Molecular Biol. Cell (ed. 2) vi. 309 The lactose carrier permease..is a single transmembrane polypeptide..that is thought to traverse the lipid bilayer at least nine times.
2000 Proc. National Acad. Sci. U.S.A. 97 14044/2 The utilization of these alternative sources of nitrogen requires a number of enzymes and permeases.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1957