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- W1593540164 abstract "The kinase and sugar phosphate exchange reactions of rat liver 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase were inactivated by treatment with 5'-p-fluorosulfonylbenzoyladenosine or 8-azido-ATP, but activity could be restored by the addition of dithiothreitol. This inactivation was accompanied by incorporation of 5'-p-sulfonylbenzoyl[8-14C]adenosine into the enzyme that was not released by the addition of dithiothreitol. The lack of effect of ATP analogs on the ATP/ADP exchange or on bisphosphatase activity and reversal of their effects on the kinase and sugar phosphate reactions by dithiothreitol suggest that 1) they reacted with sulfhydryl groups important for sugar phosphate binding in the kinase reaction, and 2) the inactivation of the kinase by these analogs involves a specific reaction that is not related to their general mechanism of attacking nucleotide-binding sites. In addition, alkylation of the enzymes' sulfhydryls with iodoacetamide prevented inactivation by 5'-p-fluorosulfonylbenzoyladenosine, suggesting that the same thiols were involved. o-Iodosobenzoate inactivated the kinase and sugar phosphate exchange; the inactivation was reversed by dithiothreitol; but there was no effect on the bisphosphatase or nucleotide exchange, indicating that oxidation occurred at the same sulfhydryl that are associated with sugar phosphate binding. ATP or ADP, but not fructose 6-phosphate, protected these groups from modification by 5'-p-fluorosulfonylbenzoyladenosine, 8-azido-ATP, and o-iodosobenzoate. ATP also induced dramatic changes in the circular dichroism spectrum of the enzyme, suggesting that adenine nucleotide protection of thiol groups resulted from changes in enzyme secondary structure. Analysis of cyanogen bromide fragments of 14C-carboxamidomethylated enzyme showed that all radioactivity was associated with cysteinyl residues in a single cyanogen bromide fragment. Three of these cysteinyl residues are clustered in a 38-residue region, which probably plays a role in maintaining the conformation of the kinase sugar phosphate-binding site." @default.
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- W1593540164 date "1987-08-01" @default.
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- W1593540164 title "Rat liver 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase. Identification of essential sulfhydryl residues in the primary sequence of the enzyme." @default.
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- W1593540164 doi "https://doi.org/10.1016/s0021-9258(18)60869-5" @default.
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