Identification of a celE-binding protein and its potential role in induction of the celE gene in Thermomonospora fusca.
AUTOR(ES)
Lin, E S
RESUMO
Thermomonospora fusca cellulase E5 is encoded by the celE gene. This gene appears to be regulated at the transcriptional level by both induction and repression, and three putative closely linked promoters have been located by S1 mapping. To study its regulatory mechanism, a gel retardation assay was used to identify a protein in T. fusca cell extracts that interacted specifically with the DNA fragment containing the celE promoters. It was found that the binding activity appeared only when cellulase synthesis was induced, and it therefore resembled an activator protein involved in cellulase induction. DNase I footprinting identified the target sequence for this protein as a 21-base-pair sequence downstream from the putative celE promoters. The level of this protein was measured in two cellulase constitutive mutants, and the results suggest a complex control for celE induction.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=211379Documentos Relacionados
- Transcription of the celE gene in Thermomonospora fusca.
- Inducible thermoalkalophilic polygalacturonate lyase from Thermomonospora fusca.
- DNA sequences and expression in Streptomyces lividans of an exoglucanase gene and an endoglucanase gene from Thermomonospora fusca.
- DNA sequences of three beta-1,4-endoglucanase genes from Thermomonospora fusca.
- Cloning of a Thermomonospora fusca xylanase gene and its expression in Escherichia coli and Streptomyces lividans.