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  • Title: A putative transcription factor binding to the upstream region of the puf operon in Rhodobacter sphaeroides.
    Author: Shimada H, Ohta H, Masuda T, Shioi Y, Takamiya K.
    Journal: FEBS Lett; 1993 Aug 09; 328(1-2):41-4. PubMed ID: 8344432.
    Abstract:
    Gel shift assays of the upstream region of the puf operon in Rhodobacter sphaeroides were performed using cell-free extracts from cells grown under various culture conditions. The results suggested that a protein binding to the upstream region functioned as a repressor-like substance of the expression of the operon by oxygen tension or light. The density of the shifted band of cell-free extracts from cells irradiated with blue light under semi-aerobic conditions was higher than that with red light. Phosphatase treatment of the cell-free extracts strongly increased the DNA-binding affinity of the protein.
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