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  • 总部: 泰国曼谷市巴吞汪区仑披尼分区 普勒吉路齐隆巷5号.
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GLUTAREDOXIN; GLRX

GLUTAREDOXIN; GLRX

Alternative titles; symbolsGRXTHIOLTRANSFERASEHGNC Approved Gene Symbol: GLRXCytogenetic location: 5q15 Genomic coordinates (GRCh38): 5:95,813,848-95,822,725...

Alternative titles; symbols

  • GRX
  • THIOLTRANSFERASE

HGNC Approved Gene Symbol: GLRX

Cytogenetic location: 5q15 Genomic coordinates (GRCh38): 5:95,813,848-95,822,725 (from NCBI)

▼ Cloning and Expression
Glutaredoxin is a glutathione (GSH)-dependent hydrogen donor for ribonucleotide reductase and also catalyzes glutathione-disulfide oxidoreduction reactions in the presence of NADPH and glutathione reductase. Padilla et al. (1995) purified a human placental glutaredoxin to homogeneity and showed that its amino acid sequence was similar to that of other known mammalian glutaredoxins (about 80% identity), with some important differences. A cDNA that encodes the entire GRX open reading frame (ORF) and flanking sequences was isolated from a human spleen cDNA library. Glutaredoxin is a small protein of 12 kD.

▼ Mapping
Using a genomic clone for fluorescence in situ hybridization, Padilla et al. (1996) mapped the GLRX gene to 5q14. This localization was in agreement with that arrived at by somatic cell hybrid analysis.

▼ Gene Function
Raghavachari et al. (2001) investigated how the expression of thioltransferase (TTase), a critical thiol repair and dethiolating enzyme, is regulated in human lens epithelial cells under oxidative stress. They also examined whether depleting the primary cellular antioxidant glutathione in these cells has any influence on TTase expression under the same conditions. They found a transient increase in TTase mRNA after 5 minutes of H(2)O(2) treatment. Upregulation reached a maximum of 80% above normal by 10 minutes and gradually decreased as the cells detoxified the oxidant. They found that manipulation of cellular GSH resulted in minimal changes in TTase expression. When cells depleted of GSH were subjected to oxidative stress, TTase expression was also strongly upregulated. Raghavachari et al. (2001) concluded that the upregulation of TTase expression in lens epithelial cells could be an adaptive response of the cells to combat oxidative stress and restore the vital functions of lens proteins and enzymes. They found that such regulation was independent of cellular GSH concentration.

Tags: 5q15