期刊
JOURNAL OF BACTERIOLOGY
卷 182, 期 1, 页码 252-255出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.182.1.252-255.2000
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Biosynthesis of extracellular cellulases in the cellulose-degrading actinomycete Thermobifida fusca is controlled by a transcriptional regulator, CelR, and cellobiose, which acts as an inducer interfering with the CelR-DNA interaction, We report the identification and characterization of a mutation in the celR gene that changes Ala(55) in the hinge helix of CelR to Thr. The wild-type and mutant celR genes were cloned in Escherichia coli, and their protein products were characterized. The CelR mutant protein bound DNA more weakly than the wild-type protein and formed a less stable complex with DNA in the presence of cellobiose. The results of Western analysis and gel retardation experiments suggest that CelR is produced constitutively and its DNA-binding activity is regulated through posttranslational modification.
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