کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1948337 1054687 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Examination of intrinsic sulfonamide resistance in Bacillus anthracis: A novel assay for dihydropteroate synthase
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Examination of intrinsic sulfonamide resistance in Bacillus anthracis: A novel assay for dihydropteroate synthase
چکیده انگلیسی
Dihydropteroate synthase (DHPS) catalyzes the formation of dihydropteroate and Mg-pyrophosphate from 6-hydroxymethyl-7,8-dihydropterin diphosphate and para-aminobenzoic acid. The Bacillus anthracis DHPS is intrinsically resistant to sulfonamides. However, using a radioassay that monitors the dihydropteroate product, the enzyme was inhibited by the same sulfonamides. A continuous spectrophotometric assay for measuring the enzymatic activity of DHPS was developed and used to examine the effects of sulfonamides on the enzyme. The new assay couples the production of MgPPi to the pyrophosphate-dependent phosphofructokinase/aldolase/triose isomerase/α-glycerophosphate dehydrogenase reactions and monitors the disappearance of NADH at 340nm. The coupled enzyme assay demonstrates that resistance of the B. anthracis DHPS results in part from the use of the sulfonamides as alternative substrates, resulting in the formation of sulfonamide-pterin adducts, and not necessarily due to an inability to bind them.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - General Subjects - Volume 1780, Issue 5, May 2008, Pages 848-853
نویسندگان
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