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• W2015715216 abstract "Prolyl 4-hydroxylase (EC 1.14.11.2), an alpha 2 beta 2 tetramer, catalyzes the posttranslational formation of 4-hydroxyproline in collagens. The enzyme can easily be dissociated into its subunits, but all attempts to associate a tetramer from the dissociated subunits in vitro have been unsuccessful. Molecular cloning of the catalytically important alpha subunit has identified two types of cDNA clone due to mutually exclusive alternative splicing. The beta subunit is a highly unusual multifunctional polypeptide, being identical to the enzyme protein disulfide-isomerase (EC 5.3.4.1). We report here on expression of the alpha and beta subunits of prolyl 4-hydroxylase and a fully active enzyme tetramer in Spodoptera frugiperda insect cells by baculovirus vectors. When the beta subunit was expressed alone, the polypeptide produced was found in a 0.1% Triton X-100 extract of the cell homogenate and was a fully active protein disulfide-isomerase. When either form of the alpha subunit was expressed alone, only traces of the alpha subunit could be extracted from the cell homogenate with 0.1% Triton X-100, and 1% SDS was required to obtain efficient solubilization. These alpha subunits had no prolyl 4-hydroxylase activity. When the cells were coinfected with both alpha- and beta-subunit-producing viruses, an enzyme tetramer was formed, but significant amounts of alpha and beta subunits remained unassociated. The recombinant tetramer was indistinguishable from that isolated from vertebrate tissue in terms of its specific activity and kinetic constants for cosubstrates and the peptide substrate. The two alternatively spliced forms of the alpha subunit gave enzyme tetramers with identical catalytic properties. Baculovirus expression seems to be an excellent system for mass production of the enzyme tetramer and for detailed investigation of the mechanisms involved in the association of the monomers." @default.
• W2015715216 created "2016-06-24" @default.
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• W2015715216 date "1992-08-15" @default.
• W2015715216 modified "2023-10-15" @default.
• W2015715216 title "Characterization of the human prolyl 4-hydroxylase tetramer and its multifunctional protein disulfide-isomerase subunit synthesized in a baculovirus expression system." @default.
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• W2015715216 doi "https://doi.org/10.1073/pnas.89.16.7467" @default.
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