Expression of glutathione peroxidase I gene in selenium-deficient rats

AP Reddy, BL Hsu, PS Reddy, N Li… - Nucleic acids …, 1988 - academic.oup.com
AP Reddy, BL Hsu, PS Reddy, N Li, K Thyagaraju, CC Reddy, MF Tam, CPD Tu
Nucleic acids research, 1988academic.oup.com
We have characterized a cDNA pGPX1211 encoding rat glutathione peroxidase I. The
selenocysteine in the protein corresponded to a TGA codon in the coding region of the
cDNA, similar to earlier findings in mouse and human genes, and a gene encoding the
formate dehydrogenase from E. coli, another selenoenzyme. The rat GSH peroxidase I has a
calculated subunit molecular weight of 22, 155 daltons and shares 95% and 86% sequence
homology with the mouse and human subunits, respectively. The 3′-noncoding sequence …
Abstract
We have characterized a cDNA pGPX1211 encoding rat glutathione peroxidase I. The selenocysteine in the protein corresponded to a TGA codon in the coding region of the cDNA, similar to earlier findings in mouse and human genes, and a gene encoding the formate dehydrogenase from E . coli , another selenoenzyme. The rat GSH peroxidase I has a calculated subunit molecular weight of 22, 155 daltons and shares 95% and 86% sequence homology with the mouse and human subunits, respectively. The 3′-noncoding sequence (>930 bp) in pGPX1211 is much longer than that of the human sequences. We found that glutathione peroxidase I mRNA, but not the polypeptide, was expressed under nutritional stress of selenium deficiency where no glutathione peroxidase I activity can be detected. The failure of detecting any apoprotein for the glutathione peroxidase I under selenium deficiency and results published from other laboratories supports the proposal that selenium may be incorporated into the glutathione peroxidase I co-translationally.
Oxford University Press
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