کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9882228 1536549 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A three-component dicamba O-demethylase from Pseudomonas maltophilia, strain DI-6: Purification and characterization
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
A three-component dicamba O-demethylase from Pseudomonas maltophilia, strain DI-6: Purification and characterization
چکیده انگلیسی
Dicamba O-demethylase is a multicomponent enzyme that catalyzes the conversion of the herbicide 2-methoxy-3,6-dichlorobenzoic acid (dicamba) to 3,6-dichlorosalicylic acid (DCSA). The three components of the enzyme were purified and characterized. OxygenaseDIC is a homotrimer (α)3 with a subunit molecular mass of approximately 40 kDa. FerredoxinDIC and reductaseDIC are monomers with molecular weights of approximately 14 and 45 kDa, respectively. EPR spectroscopic analysis suggested the presence of a single [2Fe-2S](2+/1+) cluster in ferredoxinDIC and a single Rieske [2Fe-2S](2+; 1+) cluster within oxygenaseDIC. Consistent with the presence of a Rieske iron-sulfur cluster, oxygenaseDIC displayed a high reduction potential of Em,7.0 = −21 mV whereas ferredoxinDIC exhibited a reduction potential of approximately Em,7.0 = −171 mV. Optimal oxygenaseDIC activity in vitro depended on the addition of Fe2+. The identification of formaldehyde and DCSA as reaction products demonstrated that dicamba O-demethylase acts as a monooxygenase. Taken together, these data suggest that oxygenaseDIC is an important new member of the Rieske non-heme iron family of oxygenases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Archives of Biochemistry and Biophysics - Volume 437, Issue 1, 1 May 2005, Pages 20-28
نویسندگان
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