کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6488171 1416360 2018 27 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of a topologically unique oxygenase from Sphingobium sp. PNB capable of catalyzing a broad spectrum of aromatics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Characterization of a topologically unique oxygenase from Sphingobium sp. PNB capable of catalyzing a broad spectrum of aromatics
چکیده انگلیسی
A Rieske non-heme iron ring-hydroxylating oxygenase (RHO) from Sphingobium sp. PNB involved in the initial oxidation of a wide range of low and high molecular weight polycyclic aromatic hydrocarbons (PAHs) was investigated. The RHO was shown to comprise of the gene products of distantly located ahdA1f-ahdA2f, ahdA3 and ahdA4 genes, which encoded the oxygenase α- and β-subunits, ferredoxin and reductase, respectively. In silico structural analysis of AhdA1f revealed a very large substrate-binding pocket, satisfying the spatial requirements to accommodate high molecular weight substrates. In addition, an atypical substrate access channel was noticed from the topology analysis of the oxygenase. Guided by molecular docking studies, dioxygenation of several PAHs as well as alkyl- and aryl benzenes was examined with the recombinant AhdA1fA2f expressed in Escherichia coli. Chromatographic and mass spectrometric analyses confirmed that AhdA1fA2f displays broad substrate specificity towards a wide range of aromatic hydrocarbons including potential xenobiotics, demonstrating metabolic robustness of strain PNB.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Enzyme and Microbial Technology - Volume 111, April 2018, Pages 74-80
نویسندگان
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