Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/50435
標題: Unique features of Erwinia chrysanthemi (Dickeya dadantii) RA3B genes involved in the blue indigoidine production
作者: Chu, M.K.
黃秀珍
Lin, L.F.
Twu, C.S.
Lin, R.H.
Lin, Y.C.
Hsu, S.T.
Tzeng, K.C.
Huang, H.C.
關鍵字: Erwinia chrysanthemi RA3B;Indigoidine;IdgA operon;ERIC sequence;gram-negative bacteria;virulence-factor synthesis;escherichia-coli;pigment indigoidine;eric-pcr;xanthomonas-campestris;nucleotide-sequence;rna-polymerase;pecm protein;dna cloning
Project: Microbiological Research
期刊/報告no:: Microbiological Research, Volume 165, Issue 6, Page(s) 483-495.
摘要: 
Erwinia chrysanthemi (Ech) RA3B produces a large amount of blue indigoidine. Using Tn5-induced mutagenesis, three indigoidine-deficient mutants were generated. Followed by library screening, a 5.8 kb fragment complemented mutants for indigoidine synthesis was cloned. This fragment contains four complete open-reading frames (ORFs), pecS, pecM, idgA, and idgB, and two partial ORFs, argG, and idgC. These genes are nearly identical to those in strain Ech3937. Primer extension assays demonstrated a clear transcriptional start site prior to idgA, while no promoter preceding idgB and idgC was detected, suggesting that idgA, idgB, and idgC are organized as one transcription unit. In contrast, indAB is separated from indC in Ech3937. Interestingly, an ERIC sequence was present between idgB and idgC in place of the promoter region of the homolog indC, which may contribute to the loss of promoter activity in RA3B. Futhermore, idgB mutant displayed much lighter blue color, while indB mutant appeared white on media. Overexpression of pecS in RA3B resulted in significantly reduced indigoidine production and idgC transcript. Moreover, gel shift and luxAB reporter assays revealed that PecS specifically binds to the sequence preceding idgA and inhibits gene expression, which is consistent with the results observed in Ech3937. (C) 2009 Published by Elsevier GmbH.
URI: http://hdl.handle.net/11455/50435
ISSN: 0944-5013
DOI: 10.1016/j.micres.2009.09.004
Appears in Collections:生物科技學研究所

Show full item record
 

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.