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- W1587777700 abstract "The main phosphofructokinase of Escherichia coli (PFK I) is an extensively studied allosteric enzyme specified by the pfkA gene. A nonallosteric phosphofructokinase was reported (Fraenkel, D.G., Kotlarz, D., and Bluc, H. (1973) J. Biol. Chem. 248, 4865-4866) in strains carrying the pfkB1 mutation, a suppressor of pfkA mutants, and very low levels of this enzyme have also been detected in strains not carrying the suppressor (i.e. pfkB+). The nonallosteric protein has now been prepared pure from three strains, one carrying pfkB1 and pfkA+, one carrying pfkB1 and completely deleted for pfkA, and one carrying pfkB+ and also deleted for pfkA. It is apparently the same enzyme (PFK II) in all three strains, which shows that pfkB1 is a mutation affecting the amount of a normally minor isozyme. PFK II is a tetramer of slightly larger subunit molecular weight than PFK I (36,000 and 34,000, respectively). No immunological cross-reactivity was detected between PFK II and PFK I. Unlike PFK I, PFK II does not show cooperative interactions with fructose-6-P, inhibition by P-enolpyruvate, or activation by ADP. Also unlike PFK I, PFK II is somewhat sensitive to inhibition by fructose-1,6-P2 and can use tagatose-6-P as substrate. Both enzymes can perform the reverse reaction, fructose-6-P + ATP from fructose-1,6-P2 + ADP in vitro, but not in vivo. The normal function of PFK II is not known." @default.
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- W1587777700 date "1978-06-01" @default.
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- W1587777700 title "Phosphofructokinases from Escherichia coli. Purification and characterization of the nonallosteric isozyme." @default.
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- W1587777700 doi "https://doi.org/10.1016/s0021-9258(17)34726-9" @default.
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