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. 1986 Sep;83(18):6790–6794. doi: 10.1073/pnas.83.18.6790

Purification, biochemical characterization, and biological function of human esterase D.

W H Lee, W Wheatley, W F Benedict, C M Huang, E Y Lee
PMCID: PMC386595  PMID: 3462728

Abstract

Human esterase D (carboxylesterase; carboxylic-ester hydrolase, EC 3.1.1.1), a genetic marker of retinoblastoma, was purified to biochemical homogeneity from erythrocytes. The purification scheme including carboxymethylcellulose, phenyl-Sepharose, chromatofocusing, and hydroxylapatite chromatographies resulted in a 10,000-fold purification of the enzyme with 15% recovery of total activity. The Km of esterase D was estimated to be 10 X 10(-6) M using 4-methylumbelliferyl acetate as substrate. The enzymatic activity was inhibited by p-chloromercuribenzoate and HgCl2, suggesting an important role of SH group(s) in enzyme function. Specific rabbit polyclonal and mouse monoclonal antibodies against esterase D were prepared and recognized either denatured or native human esterase D protein. Moreover, the polyclonal antibodies immunoprecipitated a polypeptide with a molecular mass of about 33-34 kDa from various cell lines of different mammalian species, indicating that the esterase D protein is highly conserved. The highest levels of this enzyme were found in liver and kidney. Furthermore, the expression of esterase D was enhanced 3-fold in a promonocytic cell line treated with phenobarbital but not with phorbol myristate acetate, suggesting that esterase D may have a role in detoxification. The availability of the homogeneous protein and its specific antibodies allows for cloning of the esterase D gene and facilitates studies of retinoblastomas.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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