کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4359478 1300511 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isolation of a flagellar operon in Azospirillum brasilense and functional analysis of FlbD
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری ایمنی شناسی و میکروب شناسی میکروبیولوژی و بیوتکنولوژی کاربردی
پیش نمایش صفحه اول مقاله
Isolation of a flagellar operon in Azospirillum brasilense and functional analysis of FlbD
چکیده انگلیسی

A 10 kb fragment containing fliF, fliH, fliN, motA, flbD, flhA, flhF and fleN genes was cloned from the genomic DNA of Azospirillum brasilense Yu62. These eight genes appear to be structurally organized as an operon. FlbD, encoded by flbD, has a HTH DNA binding domain and shows homology to σ54-dependent transcriptional activators such as NtrC, NifA and DctD. An in-frame deletion of flbD in A. brasilense abolishes biosynthesis of lateral flagella and swarming ability when grown on semi-solid surfaces. An intact copy of flbD on a plasmid complemented the ΔflbD mutant by restoring lateral flagellation and swarming ability. Transcriptional analysis demonstrated that FlbD is involved in the genetic regulation of flagella biosynthesis and acts as both an activator and a repressor of flagellum gene expression in A. brasilense. DNA binding assays indicated direct interaction between FlbD and the promoter regions of laf1, fliF and flgB genes. We propose that A. brasilense has a genetic regulation profile for flagella biosynthesis similar to that observed in Caulobacter crescentus.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Research in Microbiology - Volume 158, Issue 6, July–August 2007, Pages 521–528
نویسندگان
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