Abstract
Recent studies of the rat liver canalicular bile acid transporter/ecto-ATPase/cell CAM 105 (CBATP), a member of the carcinoembryonic antigen (CEA) supergene family, indicate that it is a multifunctional protein possessing bile acid efflux, ecto-ATPase, and intercellular aggregating properties. Cheung et al. (Cheung, P. H., Luo, W., Qiu, Y., Zhang, K. E., Millron, P., Lin, S. H. (1993) J. Biol. Chem. 268, 24303-24310) have shown that the amino-terminal Ig V-like domain of this protein is required for its aggregating properties, much like the homologous amino-terminal domain of CEA is required for its aggregating properties. The amino-terminal domains of both CBATP and CEA include a consensus ATPase sequence. Site-directed mutagenesis within this ATPase consensus sequence completely eliminates the ecto-ATPase activity of CBATP (Sippel, C. J., McCollum, M., Perlmutter, D. H. (1994) J. Biol. Chem. 269, 2820-2826). In this study we examined the possibility that it is this ATPase consensus sequence which is required for the cell aggregating properties of CBATP and CEA and whether there is a relationship between ATPase, aggregating, and bile acid efflux activities. For this we used a baculovirus vector to express in Sf9 cells wild typ...Continue Reading
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