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Author Ortiz de Orué Lucana, D. ♦ Schrempf, H.
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2000
Language English
Subject Domain (in DDC) Social sciences ♦ Sociology & anthropology
Abstract Streptomyces reticuli produces a mycelium-associated enzyme (CpeB) which exhibits heme-dependent catalase and peroxidase activity, as well as heme-independent manganese-peroxidase activity. The cpeB gene does not have a promoter of its own. It is co-transcribed together with the adjacent furS gene from at least one promoter, the position of which was deduced on the basis of high-resolution S1 mapping of transcriptional start sites. Physiological and transcriptional studies suggested that FurS acts as a transcriptional repressor in the presence of Mn2+ and Fe2+ ions. A FurS fusion protein was purified, after cloning of the corresponding gene, either from Escherichia coli or Streptomyces lividans transformants. The fusion protein from each host strain can be converted into a form that exhibits reduced electrophoretic mobility following treatment with thiol-reducing agents; in the presence of diamide, in contrast, the mobility of the protein is enhanced. Additional immunological studies have shown that the native S. reticuli FurS also shows these properties, which are due to the presence of redox-sensitive cysteine residues. As revealed by gel-shift and in vitro footprinting studies, only the reduced form of the FurS fusion protein and the reduced FurS protein (partially purified from S. reticuli) is able to bind to a motif upstream of the furS gene. In the absence of first-row divalent ions, the binding site encompasses 22 bp. In the presence of Mn2+, Fe2+, Co2+, Cu2+ or Zn2+, however, the region bound is extended by 18 bp. It is noteworthy that the region upstream of the furA gene in several mycobacteria contains a very similar motif. The predicted mycobacterial FurA shares a high degree of sequence identity with FurS, and the furA gene is linked to one that encodes a catalase-peroxidase (KatG). The implications of these findings are discussed.
ISSN 00268925
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2000-08-29
Publisher Place Berlin/Heidelberg
e-ISSN 14321874
Journal Molecular and General Genetics MGG
Volume Number 264
Issue Number 3
Page Count 13
Starting Page 341
Ending Page 353


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Source: SpringerLink