Abstract
A carboxylesterase which shares common antigenicity with sex-influenced esterase (ES-SI) was found in both the male and the female liver of the rat but not in the following tissues: erythrocyte, heart, kidney, lung, spleen, small intestine, testis, thymus, and lymph node. Subcellular fractionation showed the esterase localizes in the microsome-rich fraction. The strain distribution of the presence or absence of the esterase in inbred rats was identical to that of ES-SI, although in adult males a considerable amount of the esterase exists, unlike ES-SI. The esterase had a higher isoelectric point than ES-SI but after neuraminidase treatment the difference disappeared, suggesting that the esterase has a sialic acid moiety. Because this esterase has different properties from those previously reported, it is proposed that it is designated liver-ES-SI. The common antigenicity and similar strain distribution between ES-SI and liver-ES-SI suggest that liver-ES-SI is a precursor molecule of ES-SI and therefore the two esterases are products of a single gene.
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This work was supported in part by a Grant-in-Aid for Scientific Research on Priority Areas from the Ministry of Education, Science, and Culture of Japan.
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Nikaido, H., Hirose, T., Nikaido, O. et al. Specificity of the sex-influenced esterase (ES-SI) isozyme in rat liver. Biochem Genet 29, 261–269 (1991). https://doi.org/10.1007/BF00590106
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DOI: https://doi.org/10.1007/BF00590106