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Secretory protein : ウィキペディア英語版
Secretory protein
A secretory protein is any protein, whether it be endocrine or exocrine, which is secreted by a cell. Secretory proteins include many hormones, enzymes, toxins, and antimicrobial peptides.
Secretory proteins are synthesized in the endoplasmic reticulum.
==Production==
The production of a secretory protein starts like any other protein. The mRNA is produced and transported to the cytosol where it interacts with a free cytosolic ribosome. The part that is produced first, the N-terminal, contains a signal sequence consisting of 6 to 12 amino acids with hydrophobic side chains. This sequence is recognised by a cytosolic protein, SRP (Signal Recognition Particle), which stops the translation and aids in the transport of the mRNA-ribosome complex to an SRP receptor found in the membrane of the endoplasmic reticulum. When it arrives at the ER, the signal sequence is transferred to the translocon, a protein-conducting channel in the membrane that allows the newly synthesized polypeptide to be translocated to the ER lumen. The dissociation of SRP from the ribosome restores the translation of the secretory protein. The signal sequence is removed and the translation continues while the produced chain moves through the translocon (cotranslational translocation).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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