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- W2051259467 abstract "The smallest enzymatically active form of rabbit muscle phosphofructokinase is a tetramer of four identical or nearly identical monomers. The enzyme is inhibited by ATP, and this inhibition by ATP is relieved by the activating adenine nucleotides adenosine cyclic 3',5'-phosphate, AMP, and ADP. Each monomer contains one binding site specific for the inhibitor ATP and another site specific for the activating adenine nucleotides. The enzyme can also be activated by covalently labeling the activating adenine nucleotide binding sites with the affinity label 5'-[p-(fluorosulfonyl)benzoyl]adenosine. These activator binding sites on the enzyme have been covalently labeled to various degrees, ranging from an average value of less than one label per tetramer to four labels per tetramer, and the free-energy coupling, delta Gxy, between the covalently bound affinity label and ATP binding at the inhibitory site was determined. For enzyme preparations containing four labels per tetramer, delta Gxy is approximately 1 kcal/mol at pH 6.95 and 25 degrees C. A very significant free-energy coupling is observed in those preparations containing an average of one label per tetramer and less, and the change in delta Gxy in going from native tetramers to ones containing an average of two labels per tetramer is twice as great as the change in delta Gxy observed in going from tetramers containing an average of two labels per tetramer to ones containing four labels per tetramer, suggesting that modification of the final two monomers in the tetramer contributes much less to the antagonistic effect on ATP binding than does modification of the first two monomers in the tetramer." @default.
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- W2051259467 date "1985-01-15" @default.
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- W2051259467 title "Determination of the free-energy coupling between ATP and an affinity label attached to rabbit muscle phosphofructokinase" @default.
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- W2051259467 doi "https://doi.org/10.1021/bi00323a012" @default.
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