The Activation of Muscle Hexokinase by Divalent Metal Ions.
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Winding of the DNA helix by divalent metal ions.
When supercoiled pBR322 DNA was relaxed at 0 or 22 degrees C by topoisomerase I in the presence of the divalent cations Ca2+, Mn2+ or Co2+, the resulting distributions of topoisomers observed at 22 degrees C had positive supercoils, up to an average delta Lk value of +8.6 (for Ca2+at 0 degrees C), corresponding to an overwinding of the helix by 0.7 degrees/bp. An increase of the divalent cation...
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It is known that many of the enzyme systems which ut,ilize ATPl are activated by inorganic cations. In most instances a divalent cation is required (2) and in some cases monovalent cations are also required (3-5). These effects have usually been assumed to be due to activation of the enzyme by the cation. The demonstration that many of these cations react with ATP to form complex ions (6-10) ma...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1962
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.16-1682