کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10797826 | 1053228 | 2011 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Protein translocation across the ER membrane
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کلمات کلیدی
SECSRP receptorGRPGPiHspSRPNACSPCBiP - BIPprotein translocation - انتقال پروتئینOst - اورتStructural analysis - تحلیل سازهها یا آنالیز سازههاmembrane insertion - درج غشاءsignal recognition particle - ذرات شناخت سیگنالramp - رمپsignal peptidase complex - سیگنال پپتیداز مجتمعMolecular chaperones - شاپرن های مولکولیendoplasmic reticulum - شبکه آندوپلاسمی nucleotide exchange factor - فاکتور تبادل نوکلئوتیدیElectron microscopy - میکروسکوپ الکترونیNef - نافDriving force - نیروی پیشرانImmunoglobulin heavy chain binding protein - پروتئین اتصال زنجیره سنگین ایمونوگلوبولینglucose regulated protein - پروتئین تنظیم شده با گلوکزHeat shock protein - پروتئین شوک حرارتglycosylphosphatidylinositol - گلیکوزیل فسفاتیدیلینوزیتول
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Protein translocation into the endoplasmic reticulum (ER) is the first and decisive step in the biogenesis of most extracellular and many soluble organelle proteins in eukaryotic cells. It is mechanistically related to protein export from eubacteria and archaea and to the integration of newly synthesized membrane proteins into the ER membrane and the plasma membranes of eubacteria and archaea (with the exception of tail anchored membrane proteins). Typically, protein translocation into the ER involves cleavable amino terminal signal peptides in precursor proteins and sophisticated transport machinery components in the cytosol, the ER membrane, and the ER lumen. Depending on the hydrophobicity and/or overall amino acid content of the precursor protein, transport can occur co- or posttranslationally. The respective mechanism determines the requirements for certain cytosolic transport components. The two mechanisms merge at the level of the ER membrane, specifically, at the heterotrimeric Sec61 complex present in the membrane. The Sec61 complex provides a signal peptide recognition site and forms a polypeptide conducting channel. Apparently, the Sec61 complex is gated by various ligands, such as signal peptides of the transport substrates, ribosomes (in cotranslational transport), and the ER lumenal molecular chaperone, BiP. Binding of BiP to the incoming polypeptide contributes to efficiency and unidirectionality of transport. Recent insights into the structure of the Sec61 complex and the comparison of the transport mechanisms and machineries in the yeast Saccharomyces cerevisiae, the human parasite Trypanosoma brucei, and mammals have various important mechanistic as well as potential medical implications. This article is part of a Special Issue entitled Protein translocation across or insertion into membranes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Biomembranes - Volume 1808, Issue 3, March 2011, Pages 912-924
Journal: Biochimica et Biophysica Acta (BBA) - Biomembranes - Volume 1808, Issue 3, March 2011, Pages 912-924
نویسندگان
Richard Zimmermann, Susanne Eyrisch, Mazen Ahmad, Volkhard Helms,