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CDNA Cloning, Overexpression in Escherichia coli, Purification and Characterization of Sheep Liver Cytosolic Serine Hydroxymethyltransferase

Jagath-Reddy, Junutula and Ganesan, Kaliannan and Savithri, Handanahal S and Datta, Asis and Rao, Naropantul Appaji (1995) CDNA Cloning, Overexpression in Escherichia coli, Purification and Characterization of Sheep Liver Cytosolic Serine Hydroxymethyltransferase. In: European Journal of Biochemistry, 230 (2). pp. 533-537.

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A sheep liver cDNA clone for the cytosolic serine hydroxymethyltransferase (SHMT) was isolated and its nucleotide sequence determined. The full-length cDNA of SHMT was placed under the control of T7 promoter in pET-3C plasmid and expressed in Escherichia coli. The overexpressed enzyme, present predominantly in the soluble fraction, was catalytically active. The recombinant SHMT was purified to homogeneity with a yield of 10 mg/l bacterial culture. The recombinant enzyme was capable of carrying out tetrahydrofolate-dependent and tetrahydrofolate-independent reactions as effectively as the native enzyme. The K-m values for serine (1 mM) and tetrahydrofolate (0.82 mM) were similar to those of the native enzyme. The recombinant enzyme had a characteristic visible spectrum indicative of the presence of pyridoxal 5'-phosphate as an internal aldimine. The apoenzyme obtained upon removal of the cofactor was inactive and could be reconstituted by the addition of pyridoxal 5'-phosphate demonstrating that the recombinant SHMT was functionally very similar to the native SHMT. This overexpression of eukaryotic tetrameric SHMT in E. coli and the purification and characterization of the recombinant enzyme should thus allow studies on the role of specific amino acids and domains in the activity of the enzyme.

Item Type: Journal Article
Publication: European Journal of Biochemistry
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 27 Apr 2011 06:57
Last Modified: 27 Apr 2011 06:57
URI: http://eprints.iisc.ac.in/id/eprint/37222

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