A tetrameric iron superoxide dismutase from the eucaryote Tetrahymena pyriformis - PubMed (original) (raw)
Comparative Study
. 1990 Oct 15;265(29):17680-7.
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- PMID: 2170391
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Comparative Study
A tetrameric iron superoxide dismutase from the eucaryote Tetrahymena pyriformis
D Barra et al. J Biol Chem. 1990.
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Abstract
An iron-containing superoxide dismutase has been purified from the protozoan Tetrahymena pyriformis. It has a molecular weight of 85,000 and is composed of four subunits of equal size. The tetramer contains 2.5 g atoms of ferric iron. Visible absorption and electron spin resonance spectra closely resemble those of other iron-containing superoxide dismutases. The amino acid sequence of the iron superoxide dismutase was determined. Each subunit is made up of 196 residues, corresponding to a molecular weight of 22,711. Comparison of the primary structure with the known sequences of other iron-containing superoxide dismutases reveals a relatively low degree of identity (33-34%). However, a higher percentage identity is found with mammalian manganese-containing superoxide dismutases (41-42%). The amino acid sequence is discussed in consideration of residues that may distinguish iron from manganese or dimeric from tetrameric superoxide dismutases.
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