کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10537297 | 962709 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Recognition and binding of apocytochrome c to P. aeruginosa CcmI, a component of cytochrome c maturation machinery
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کلمات کلیدی
CytCTetratricopeptide repeatsTPR domaincytochrome c biogenesisCCm - CCMFluorescence resonance energy transfer - انتقال انرژی رزونانس FluorescenceFRET - انتقال انرژی رزونانسی فورسترCytochrome c maturation - بلوغ سیتوکرومProtein–protein interaction - تعامل پروتئین-پروتئینdansyl - دانسیلTPR - روش پاسخ فیزیکیCitrate synthase - سیترات سیتواستاتcytochrome c - سیتوکروم سی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The biogenesis of c-type cytochromes (Cytc) is a process that in Gram-negative bacteria demands the coordinated action of different periplasmic proteins (CcmA-I), whose specific roles are still being investigated. Activities of Ccm proteins span from the chaperoning of heme b in the periplasm to the specific reduction of oxidized apocytochrome (apoCyt) cysteine residues and to chaperoning and recognition of the unfolded apoCyt before covalent attachment of the heme to the cysteine thiols can occur. We present here the functional characterization of the periplasmic domain of CcmI from the pathogen Pseudomonas aeruginosa (Pa-CcmI*). Pa-CcmI* is composed of a TPR domain and a peculiar C-terminal domain. Pa-CcmI* fulfills both the ability to recognize and bind to P. aeruginosa apo-cytochrome c551 (Pa-apoCyt) and a chaperoning activity towards unfolded proteins, as it prevents citrate synthase aggregation in a concentration-dependent manner. Equilibrium and kinetic experiments with Pa-CcmI*, or its isolated domains, with peptides mimicking portions of Pa-apoCyt sequence allow us to quantify the molecular details of the interaction between Pa-apoCyt and Pa-CcmI*. Binding experiments show that the interaction occurs at the level of the TPR domain and that the recognition is mediated mainly by the C-terminal sequence of Pa-apoCyt. The affinity of Pa-CcmI* to full-length Pa-apoCyt or to its C-terminal sequence is in the range expected for a component of a multi-protein complex, whose task is to receive the apoCyt and to deliver it to other components of the apoCyt:heme b ligation protein machinery.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics - Volume 1834, Issue 8, August 2013, Pages 1554-1561
Journal: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics - Volume 1834, Issue 8, August 2013, Pages 1554-1561
نویسندگان
Eva Di Silvio, Adele Di Matteo, Francesco Malatesta, Carlo Travaglini-Allocatelli,