Iron and aconitase activity |
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Authors: | Oscar Gawron Abdul Waheed Andrew J Glaid III and Anna Jaklitsch |
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Institution: | Department of Chemistry, Duquesne University, Pittsburgh, Pa. 15219, U.S.A. |
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Abstract: | Aconitase activated with Fe(2+), cysteine and ascorbate incorporates 1 g-atom of Fe(2+)/mol. Loss of this Fe(2+) by transfer to ferrozine, a Fe(2+) chelator, results in loss of activity. Ascorbate increases the rate of transfer of the essential Fe(2+) whereas citrate retards the rate of transfer. Transfer of Fe(2+) from inactive aconitase, 2 g-atoms of Fe/mol, can be accomplished in the presence of urea and ascorbate. The correlation of activity with the presence of an added g-atom of Fe(2+)/mol leads to the conclusion that active aconitase has only one active site per mol. |
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