کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2828835 1162765 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
FtsH cleavage of non-native conformations of proteins
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شناسی مولکولی
پیش نمایش صفحه اول مقاله
FtsH cleavage of non-native conformations of proteins
چکیده انگلیسی
FtsH is a peculiar prokaryotic protease with low unfoldase activity. Different reports have proposed that FtsH substrates could be either tagged proteins or proteins of low stability. We show here that FtsH degradation of 31 point mutants of Anabaena apoflavodoxin is inversely proportional to their conformational stabilities, and that the same applies to other substrate proteins. In contrast, highly stable proteins such as GST and holoflavodoxin are not degraded at all. Attempts to identify sequence tags signaling for degradation in apoflavodoxin fragments have been unsuccessful. Apoflavodoxin adopts three conformations: native, partly unfolded and fully unfolded. It is revealing that degradation of the 31 variants is proportional to the molar fraction of fully unfolded molecules and inversely proportional to the fraction of stable apoflavodoxin molecules. This indicates that FtsH, rather than unfolding the protein, acts on the fraction that is already unfolded.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Biology - Volume 171, Issue 2, August 2010, Pages 117-124
نویسندگان
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