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• W2069299715 abstract "In this paper, the existence and purification of two species of phosphofructokinase regulatory factor activity are reported. The purification procedure included liver homogenization and ultracentrifugation, a 93 degrees C heat step on the supernate, precipitation with ammonium sulfate, DEAE-cellulose column chromatography, and Sephadex G-75 (fine) chromatography. Two discrete regions of factor activity were eluted from the DEAE-cellulose column with a 0 to 0.5 M linear NaCl gradient. The lesser anionic fraction was not significantly retarded by DEAE-cellulose at pH 7.6, and was referred to as factor A. The more anionic form, factor B, eluted at about 0.2 M NaCl. The presence of two active fractions was confirmed by separation of factor activity (prior to DEAE-cellulose chromatography) into two discrete species by preparative isoelectric focusing on granulated gel. The isoelectric points were approximately 7.0 for factor B and 8.5 for factor A. Factor A and factor B exhibited quite different elution volumes, i.e., apparent molecular weights, when applied to a Sephadex G-75 column. Rechromatography on a Sephadex G-75 column was used for further purification and estimation of native molecular weight. The gel filtration method yielded a molecular weight of 13,800 +/- 1,800 for factor A. Factor A activity eluted as a symmetrical protein peak of constant specific activity, suggesting a homogeneous preparation. For factor B, the absorption at 280 nm and activity profile did not directly overlap. When the peak absorbance at 280 nm was considered, a molecular weight range of 39,000 +/- 4,000 was found, and on the basis of activity the molecular weight range was 36,000 +/- 4,000. After the final Sephadex G-75 chromatographic step, sodium dodecyl sulfate (SDS)-polyacrylamide slab gel electrophoresis of each SDS-treated factor preparation indicated that factor A, after visualization by silver staining, was homogeneous, with a subunit molecular weight of approximately 12,000. The factor B preparation consisted of two major polypeptides (11,000 and 18,000). The data appeared to support the conclusions that factor B was a dimer of the 18,000-Da subunit, and that the major contaminant was a tetramer of the 11,000-Da subunit." @default.
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• W2069299715 date "1984-12-01" @default.
• W2069299715 modified "2023-09-23" @default.
• W2069299715 title "Purification of the phosphofructokinase regulatory factors" @default.
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• W2069299715 doi "https://doi.org/10.1016/0003-9861(84)90223-6" @default.
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