کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2052663 1074235 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mouse stefins A1 and A2 (Stfa1 and Stfa2) differentiate between papain-like endo- and exopeptidases
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Mouse stefins A1 and A2 (Stfa1 and Stfa2) differentiate between papain-like endo- and exopeptidases
چکیده انگلیسی

Stefin A (Stfa) acts as a competitive inhibitor of intracellular papain-like cysteine proteases which play important roles in normal cellular functions such as general protein turnover, antigen processing and ovarian follicular growth and maturation. In the mouse there are at least three different variants of Stfa (Stfa1, Stfa2 and Stfa3). Recent genetic studies identified structural polymorphisms in Stfa1 and Stfa2 as candidates for Aod1b, a locus controlling susceptibility to day three thymectomy (D3Tx)-induced autoimmune ovarian disease (AOD). To evaluate the functional significance of these polymorphisms, recombinant allelic proteins were expressed in Escherichia coli, purified and characterized. The polymorphisms do not markedly alter the folding characteristics of the two proteins. Stfa1 and Stfa2 both act as fast and tight binding inhibitors of endopeptidases papain and cathepsins L and S, however their interaction with exopeptidases cathepsins B, C and H was several orders of magnitude weaker compared to human, porcine and bovine Stfa. Notwithstanding, the Ki values for the interactions of Stfa1-b from AOD resistant C57BL/6J mice was 10-fold higher than that of the Stfa1-a allele from susceptible A/J mice for papain, cathepsins B, C and H but not L and S. In contrast, the inhibitory activities of Stfa2-a and Stfa2-b were found to be roughly equivalent for all targets peptidases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 580, Issue 17, 24 July 2006, Pages 4195–4199
نویسندگان
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