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Recombinant Bovine Rhodanese: Purification and Comparison With Bovine Liver Rhodanese

Recombinant Bovine Rhodanese: Purification and Comparison With Bovine Liver Rhodanese

D M Miller, G P Kurzban, J A Mendoza, J M Chirgwin, S C Hardies, P M Horowitz

Biochim Biophys Acta. 1992 Jun 24;1121(3):286-92.

PMID: 1627606

Abstract:

Recombinant bovine rhodanese (thiosulfate: cyanide sulfurtransferase, EC 2.8.1.1) has been purified to homogeneity from Escherichia coli BL21(DE3) by cation-exchange chromatography. Recombinant and bovine liver rhodanese coelectrophorese under denaturing conditions, with an apparent subunit molecular weight of 33,000. The amino terminal seven residues of the recombinant protein are identical to those of the bovine enzyme, indicating that E. coli also removes the N-terminal methionine. The Km for thiosulfate is the same for the two proteins. The specific activity of the recombinant enzyme is 12% higher (816 IU/mg) than that of the bovine enzyme (730 IU/mg). The two proteins are indistinguishable as to their ultraviolet absorbance and their intrinsic fluorescence. The ability of the two proteins to refold from 8 M urea to enzymatically active species was similar both for unassisted refolding, and when folding was assisted either by the detergent, lauryl maltoside or by the E. coli chaperonin system composed of cpn60 and cpn10. Bovine rhodanese is known to have multiple electrophoretic forms under native conditions. In contrast, the recombinant protein has only one form, which comigrates with the least negatively charged of the bovine liver isoforms. This is consistent with the retention of the carboxy terminal residues in the recombinant protein that are frequently removed from the bovine liver protein.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9026044	Rhodanese from bovine liver		9026-04-4	Price

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