Confused and have questions? We’ve got answers. With Chegg Study, you can get step-by-step solutions to your questions from an expert in the field. If you rather get 1:1 study help, try 30 minutes of free online tutoring with Chegg Tutors.

Extrinsic protein

From Biology-Online Dictionary | Biology-Online Dictionary
(Redirected from Extrinsic proteins)
Jump to: navigation, search


noun, plural: extrinsic proteins

A membrane protein that partially span the membrane, and is attached either to the outer or to the inner phospholipid layer.


Extrinsic proteins serve in transport of molecules and as receptors. They are held to the cell membrane by weak molecular attractions, like ionic, hydrogen, or Van der Waals bonds.

Word origin: LL extrinsecus, outward, adj. use of L extrinsecus (adv.) on the outward side.

Synonym: peripheral membrane protein.
Compare: intrinsic protein.
See also: cell membrane, fluid mosaic model.