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Purification and properties of ferrochelatase from Chironomidae larvae

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Abstract

Ferrochelatase with an Mr of 42,700 Da and a pI of 7.35 has been purified to homogeneity from chironomidae larvae. The activity of the enzyme reached maximum at pH 7.8 and decreased with the increase of pH. The enzyme activity varied with temperature and showed maximum activity around 37°C. The purified enzyme was active towards protoporphyrin but inactive towards other porphyrins. The specific enzyme activity of ferrochelatase from chironomidae is about 10-fold higher than that of the rat. Electrophoresis of the purified fractions shows that the enzyme contains only one single polypeptide. The soluble ferrochelatase contained one mole of iron in each mole of the enzyme. The N-terminal sequence analysis of the enzyme shows a high percentage of conserved regions of the enzyme among other species. The enzyme properties are similar to those of the mammalian ferrochelatases except with slightly higher specific activity. Chironomidae ferrochelatase appeared to be more heat resistant and less susceptible than its mammalian equivalent to inhibition by lead.

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Authors and Affiliations

  1. Department of Biochemistry, The Chinese University of Hong Kong, Shatin, Hong Kong

    Yuet Kin Leung & John W. Ho

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  1. Yuet Kin Leung
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  2. John W. Ho
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Correspondence to John W. Ho.

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Leung, Y.K., Ho, J.W. Purification and properties of ferrochelatase from Chironomidae larvae. Mol Cell Biochem 220, 161–167 (2001). https://doi.org/10.1023/A:1010976829463

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