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. 1990 Sep 15;270(3):697–703. doi: 10.1042/bj2700697

Expression of human liver arginase in Escherichia coli. Purification and properties of the product.

M Ikemoto 1, M Tabata 1, T Miyake 1, T Kono 1, M Mori 1, M Totani 1, T Murachi 1
PMCID: PMC1131788  PMID: 2241902

Abstract

Arginase is an enzyme that catalyses the hydrolysis of arginine to urea and ornithine. It is abundantly present in the liver of ureotelic animals (i.e. those whose excretion is characterized by the excretion of uric acid as the chief end-product of nitrogen metabolism), but its purification has hitherto not been simple, and the yield not high. Starting with a partially truncated cDNA for human liver arginase recently made available, we constructed an expression plasmid that had tandemly linked tac promotors placed upstream of a full-length cDNA. By selecting Escherichia coli strain KY1436 as the host micro-organism, we established an efficient system for the production of human liver arginase protein. Chromatographies on CM-Sephadex G-150, DEAE-cellulose and Sephadex G-150, followed by preparative agar-gel electrophoresis, yielded 10 mg of apparently homogeneous enzyme protein from 1 g (wet wt.) of E. coli cells. E. coli-expressed human liver arginase had chemical, immunological and most catalytic properties indistinguishable from those of purified human erythrocyte arginase. However, E. coli-expressed arginase was a monomer of Mr 35,000, whereas the purified erythrocyte arginase was trimer of Mr 105,000. They differed also in pH- and temperature-stabilities. Gel-filtration experiments with these two purified arginases under various conditions, as well as with unfractionated human liver and erythrocyte cytosol preparations, indicated that the native form of human arginase should be of Mr 35,000, and that the trimeric appearance of human erythrocyte arginase after purification was an artifact of the purification procedures. It was thus concluded that, in Nature, the liver and erythrocyte arginases are identical proteins.

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Selected References

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