Cloning and characterization of a plastidic glycerol 3-phosphate dehydrogenase cDNA from Dunaliella salina

A cDNA encoding a nicotinamide adenine dinucleotide (NAD +)-dependent glycerol 3-phosphate dehydrogenase (GPDH) has been cloned by rapid amplification of cDNA ends from Dunaliella salina. The cDNA is 3032 base pairs long with an open reading frame encoding a polypeptide of 701 amino acids. The polyp...

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Veröffentlicht in:Journal of plant physiology 2007-02, Vol.164 (2), p.214-220
Hauptverfasser: He, Qinghua, Qiao, Dairong, Bai, Linhan, Zhang, Qinglian, Yang, Wanggui, Li, Qian, Cao, Yi
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container_issue 2
container_start_page 214
container_title Journal of plant physiology
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creator He, Qinghua
Qiao, Dairong
Bai, Linhan
Zhang, Qinglian
Yang, Wanggui
Li, Qian
Cao, Yi
description A cDNA encoding a nicotinamide adenine dinucleotide (NAD +)-dependent glycerol 3-phosphate dehydrogenase (GPDH) has been cloned by rapid amplification of cDNA ends from Dunaliella salina. The cDNA is 3032 base pairs long with an open reading frame encoding a polypeptide of 701 amino acids. The polypeptide shows high homology with published NAD +-dependent GPDHs and has at its N-terminal a chloroplast targeting sequence. RNA gel blot analysis was performed to study GPDH gene expression under different conditions, and changes of the glycerol content were monitored. The results indicate that the cDNA may encode an osmoregulated isoform primarily involved in glycerol synthesis. The 701-amino-acid polypeptide is about 300 amino acids longer than previously reported plant NAD +-dependent GPDHs. This 300-amino-acid fragment has a phosphoserine phosphatase domain. We suggest that the phosphoserine phosphatase domain functions as glycerol 3-phosphatase and that, consequently, NAD +-dependent GPDH from D. salina can catalyze the step from dihydroxyacetone phosphate to glycerol directly. This is unique and a possible explanation for the fast glycerol synthesis found in D. salina.
doi_str_mv 10.1016/j.jplph.2006.04.004
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The cDNA is 3032 base pairs long with an open reading frame encoding a polypeptide of 701 amino acids. The polypeptide shows high homology with published NAD +-dependent GPDHs and has at its N-terminal a chloroplast targeting sequence. RNA gel blot analysis was performed to study GPDH gene expression under different conditions, and changes of the glycerol content were monitored. The results indicate that the cDNA may encode an osmoregulated isoform primarily involved in glycerol synthesis. The 701-amino-acid polypeptide is about 300 amino acids longer than previously reported plant NAD +-dependent GPDHs. This 300-amino-acid fragment has a phosphoserine phosphatase domain. We suggest that the phosphoserine phosphatase domain functions as glycerol 3-phosphatase and that, consequently, NAD +-dependent GPDH from D. salina can catalyze the step from dihydroxyacetone phosphate to glycerol directly. 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subjects Amino Acid Sequence
Biological and medical sciences
Chlorophyta - enzymology
Chlorophyta - genetics
Chlorophyta - metabolism
Dunaliella salina
Enzymes
Fundamental and applied biological sciences. Psychology
Gene Expression
Glycerol
Glycerol - metabolism
Glycerol 3-phosphatase
Glycerol 3-phosphate dehydrogenase
Glycerolphosphate Dehydrogenase - genetics
Glycerolphosphate Dehydrogenase - metabolism
Metabolism
Molecular Sequence Data
Osmotic stress
Plant physiology and development
Plastids - metabolism
Sequence Analysis, DNA
title Cloning and characterization of a plastidic glycerol 3-phosphate dehydrogenase cDNA from Dunaliella salina
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