کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2049862 1543462 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Identification of two inactive forms of the central sulfur cycle protein SoxYZ of Paracoccus pantotrophus
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Identification of two inactive forms of the central sulfur cycle protein SoxYZ of Paracoccus pantotrophus
چکیده انگلیسی

The central protein of the sulfur-oxidizing enzyme system of Paracoccus pantotrophus, SoxYZ, reacts with three different Sox proteins. Its active site Cys110Y is on the carboxy-terminus of the SoxY subunit. SoxYZ “as isolated” consisted mainly of the catalytically inactive SoxY-Y(Z)2 heterotetramer linked by a Cys110Y-Cys110Y interprotein disulfide. Sulfide activated SoxYZ “as isolated” 456-fold, reduced the disulfide, and yielded an active SoxYZ heterodimer. The reductant tris(2-carboxyethyl)phosphine (TCEP) inactivated SoxYZ. This form was not re-activated by sulfide, which identified it as a different inactive form. In analytical gel filtration, the elution of “TCEP-treated” SoxYZ was retarded compared to active SoxYZ, indicating a conformational change. The possible enzymes involved in the re-activation of each inactive form of SoxYZ are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 582, Issues 25–26, 29 October 2008, Pages 3701–3704
نویسندگان
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