Molecular cloning and characterization of theta-class glutathione S-transferase (GST-T) from the hermaphroditic fish Rivulus marmoratus and biochemical comparisons with alpha-class glutathione S-transferase (GST-A).
Biochem Biophys Res Commun
; 346(3): 1053-61, 2006 Aug 04.
Article
em En
| MEDLINE
| ID: mdl-16782055
ABSTRACT
We cloned and sequenced full-length cDNA of a theta-class-like glutathione S-transferase (GST-T) from liver tissue of the self-fertilizing fish Rivulus marmoratus. The full-length cDNA of rm-GST-T was 907 bp in length containing an open reading frame of 666 bp that encoded a 221-amino acid putative protein. Its derived amino acid sequence was clustered with other vertebrate theta-class GSTs in a phylogenetic tree. The deduced amino acid sequence of theta-like rm-GST (rm-GST-T) was compared with both classes (alpha and theta) of GST and alpha-class rm-GST (rm-GST-A). Tissue-specific expression of two rm-GST mRNAs was investigated using real-time RT-PCR. To further characterize the catalytic properties of this enzyme along with rm-GST-A, we constructed the recombinant theta-like rm-GST plasmid with a 6 x His-Tag at the N-terminal of rm-GST-T cDNA. Recombinant rm-GST-T was highly expressed in transformed Escherichia coli, and its soluble fraction was purified by His-Tag affinity column chromatography. The kinetic properties and effects of pH and temperature on rm-GST-T were further studied, along with enzyme activity and inhibition effects, and compared with recombinant rm-GST-A. These results suggest that recombinant rm-GSTs such as rm-GST-A and rm-GST-T play a conserved functional role in R. marmoratus.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ciprinodontiformes
/
Glutationa Transferase
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Biochem Biophys Res Commun
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Coréia do Sul