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What is a type I vs type II vs type II transmembrane protein?

Type I membrane proteins are single-pass transmembrane proteins which have their N-terminus exposed to the extracellular or luminal space, while type II membrane proteins have their C-terminus exposed to the extracellular or luminal space. Type III membrane proteins are multi-pass structures which are subdivided into IIIa and IIIb. The type IIIa have cleavable signal sequences while the type IIIb do not have a cleavable signal peptide and their N-terminus is extracellular.

http://answers.yahoo.com/question/index?qid=20060802152903AACcsC7

Asker's Rating:  Asker's Comment: You were ALMOST right, but got me on the right track... I finally found a source for the specifics.
Type I: N terminal signal sequence, cleaved, C terminal cytoplasmic tail.
Type II: No signal sequence, C terminal lumenal, N terminal cytoplasmic
Type III: Same as II, but N is lumenal, C it cyto

[ Last edited by brightfuture01 on 2011-1-7 at 14:29 ]
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¸ù¾Ýsinger·ÖÀà·¨(singer classification )( On the transfer of integral proteins into membranes) Proc. Nati. Acad. Sci. USA
Vol. 84, pp. 1960-1964, April 1987
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