Dictionary » E » Extrinsic protein

Extrinsic protein


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.

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cell membrane

... above and on my book, i think the two surfaces must be lipids, and proteins are just like some points stand out. What i mean is they don't cover ... occupy a point, not the whole two 'bread'. Yes, these are Intrinsic and Extrinsic proteins.... Covers 50% of surface area of cell membrane and useful ...

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by sachin
Mon Jan 08, 2007 4:43 am
Forum: Cell Biology
Topic: cell membrane
Replies: 10
Views: 20789

effect of lead on photosynthesis and respiration

... 1987). It damages the photosynthetic apparatus due to its affinity for protein N- and S- ligands (Ahmed and Tajmir-Riahi, 1993). An enhancement ... al., 1998). Pb also causes strong dissociation of the oxygen evolving extrinsic polypeptide of PS II and displacement of Ca, Cl-, Mn from the oxygen-evolving ...

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by aileen
Sat Jan 28, 2006 6:05 am
Forum: Botany Discussion
Topic: lead and seeding
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