Abstract
A search of the chicken expressed sequence tag (EST) database identified 2 cDNA clones that appeared to represent members of the SULT1B and SULT1C enzyme families. These cDNAs were fully sequenced and found to contain full-length inserts. Phylogenetic analysis of the derived amino acid sequences clearly placed them as the first members of the chicken SULT1B and SULT1C families, respectively, to be identified, and we propose they be named SULT1B1 and SULT1C1. (CHICK)SULT1B1 shares approximately 60% amino acid sequence identity with mammalian SULT1B enzymes, whereas the closest neighbor to (CHICK)SULT1C1 was the ortholog (RAT)SULT1C1, with 68% identity. We cloned these cDNAs into the bacterial expression vectors from the pET series. Transformed Escherichia coli cells strongly expressed the recombinant proteins. Purification of the recombinant enzymes from E. coli was accomplished by a three-step procedure involving ammonium sulfate precipitation, anion exchange chromatography, and affinity chromatography. The purified enzymes displayed subunit molecular weights of approximately 35,000Da on SDS-PAGE, as predicted, and were both able to sulfate a wide range of compounds, including xenobiotics and endogenous substrates such as iodot...Continue Reading
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