A new human liver UDP-glucuronosyltransferase (HlugP4) has been cloned and expressed in cell culture. The expressed enzyme has a molecular mass of 56 kDa and preferentially catalysed the glucuronidation of halogenated and bulky alkyl phenols. The C-terminal half of the sequence (246 amino acids) is 96% identical with the same portion of HlugP1, whereas the N-terminal half of the deduced protein sequences are only 38% identical. These results suggest that the two isoenzymes may be derived from the same gene by differential splicing of the gene product.

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