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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 ¿ÉÒÔ½«Ä¤ÄÚÔÚµ°°×ÖÊ·ÖΪÒÔÏÂ6¸öÀàÐÍ£º 1¡¢IÐÍ£ºÒ»´Î¿çĤ£¬NÍâCÄÚ 2¡¢IIÐÍ£ºÒ»´Î¿çĤ£¬N¶ËÔÚϸ°ûÄÚ²¿ÄÚCÍâ 3¡¢IIIÐÍ£º¶à´Î¿çĤ£¬ÒÔ4´ÎºÍ7´Î¿çĤ¶à¼û 4¡¢IVÐÍ£ºÓɶà¸öÑǵ¥Î»×é³ÉµÄ¿çĤͨµÀ 5¡¢VÐÍ£º¶àëÄÁ´ÒÔÌÇ»ùÁ×Ö¬õ£¼¡´¼£¨GPI£©Á¬½ÓÓÚϸ°ûĤµÄÖ¬ÖÊË«²ãÖС£ 6¡¢VIÐÍ£ºÒ»Ìõ¶àëÄÁ´µÄÒ»¶ËÒÔGPIÐÎʽÁ¬½ÓÓÚ°û½°Ä¤£¬ÁíÒ»¶ËÊÇÒ»´Î»ò¶à´Î¿çĤ |
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