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J. Biol. Chem., Vol. 262, Issue 18, 8690-8695, Jun, 1987
HS Son and SG Rhee
A procedure was developed to purify large quantities of PII protein from an Escherichia coli strain which contains a multicopy plasmid harboring the structural gene of PII (the glnB gene). Ultraviolet spectra of uridylylated and unuridylylated PII were obtained using the purified PII and empirical formulas to calculate the concentration of protein and the average number of uridylylated subunits per molecule were derived. A continuous fluorometric assay for the measurement of uridylylated PII (PIID) and adenylyltransferase (ATase) was also established. Rate measurements at various concentrations of PIID and at a fixed concentration of ATase showed that a tetrameric PIID molecule interacts with only one ATase molecule at a time. The complete nucleotide sequence of the glnB gene was determined and parts of the deduced amino acid sequence were confirmed by the results of amino acid sequence analysis of peptides. The PII subunit consists of 103 amino acids (Mr = 11,580). Two tyrosines reside at positions 46 and 51, where Tyr51 is the site of uridylylation. Nucleotide sequence analysis of the upstream region showed no obvious sites for the binding of RNA polymerase, indicating that the glnB gene is a part of an as yet unidentified operon.
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