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Keywords:

  • Dunaliella salina;
  • Mitochondrial glycerol-3-phosphate dehydrogenase;
  • Stress

Abstract

The mitochondrial FAD-dependent glycerol-3-phosphate dehydrogenase (FAD-GPDH), recently reported in plants, has been detailed in yeast and animal systems. It oxidizes glycerol-3-phosphate (G-3-P) to dihydroxyacetone phosphate (DHAP) on the outer surface of mitochondrial inner membrane. A cDNA encoding the Dunaliella salina mitochondrial glycerol-3-phosphate dehydrogenase (DsFAD-GPDH) has been cloned and sequenced. The full length cDNA is 2791 bp, with an open reading frame (ORF) encoding 650 predicted amino acids, which show strong homology to reported FAD-GPDHs and have an apparent mitochondrial targeting sequence in the N-terminal. The sequence has been submitted to the GenBank database under Accession No. DQ916107. Results of Real-Time Quantitative PCR and enzymatic assays show that expression of DsFAD-GPDH is enhanced at first by salt treatment, and repressed by oxygen deficiency and cold stress. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)