A Selenocysteine-Containing Peroxiredoxin from the Strictly Anaerobic Organism Eubacterium acidaminophilum
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Brigitte Söhling
Abstract
A strongly [75]Selabeled 22 kDa protein detected previously showed in its Nterminal sequence the highest similarity to the family of thioldependent peroxidases, now called peroxiredoxins. The respective gene prxU was cloned and analyzed. prxU encodes a protein of 203 amino acids (22470 Da) and contains an inframe UGA codon (selenocysteine) at the position of the so far strictly conserved and catalytically active Cys47. The second conserved cysteine present in 2-Cys peroxiredoxins was replaced by alanine. Heterologous expression of the Eubacterium acidaminophilum PrxU as a recombinant selenoprotein in Escherichia coli was not possible. A cysteineencoding mutant gene, prxU47C, containing UGC instead of UGA was strongly expressed. This recombinant PrxU47C mutant protein was purified to homogeneity by its affinity tag, but was not active as a thioldependent peroxidase. The identification of prxU reveals that the limited class of natural selenoproteins may in certain organisms also include isoenzymes of peroxiredoxins, previously only known as nonselenoproteins containing catalytic cysteine residues.
Copyright © 2001 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Biological Activity of Mammalian Transcriptional Repressors
- Cloning and Characterisation of Chlorophyll Synthase from Avena sativa
- DNA Damage by 3,6-Dihydropyrazine-2,5-Dipropanoic Acid, the Cyclic Dimerization Product of 5-Aminolevulinic Acid
- Chicken Erythrocyte Pyrimidine 5-Nucleotidase: Purification and Characterization of the Subclass I Enzyme
- Coenzymes Q9 and Q10, Vitamin E and Peroxidation in Rat Synaptic and Non-Synaptic Occipital Cerebral Cortex Mitochondria during Ageing
- Membrane Activity of (Cys48Ser) Lung Surfactant Protein B Increases with Dimerisation
- Participation of Residue F552 in Domain III of the Protective Antigen in the Biological Activity of Anthrax Lethal Toxin
- Purification of Chrysancorin, a Novel Antifungal Protein with Mitogenic Activity from Garland Chrysanthemum Seeds
- Legumain Forms from Plants and Animals Differ in Their Specificity
- Assignment of the Complete Disulphide Bridge Pattern in the Human Recombinant Follitropin β -Chain
- The Small GTPase Ras Is Involved in Growth Factor-Regulated Expression of the α1 Integrin Subunit in PC12 Cells
- The Mouse Gap Junction Gene Connexin29 Is Highly Expressed in Sciatic Nerve and Regulated during Brain Development
- A Selenocysteine-Containing Peroxiredoxin from the Strictly Anaerobic Organism Eubacterium acidaminophilum
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