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. 1992 Nov;11(11):4213–4217. doi: 10.1002/j.1460-2075.1992.tb05515.x

Site-directed mutagenesis of human protein disulphide isomerase: effect on the assembly, activity and endoplasmic reticulum retention of human prolyl 4-hydroxylase in Spodoptera frugiperda insect cells.

K Vuori 1, T Pihlajaniemi 1, R Myllylä 1, K I Kivirikko 1
PMCID: PMC556932  PMID: 1327760

Abstract

Protein disulphide isomerase (PDI) is a highly unusual multifunctional polypeptide, identical to the beta-subunit of prolyl 4-hydroxylase. It has two -Cys-Gly-His-Cys- sequences which represent two independently acting catalytic sites of PDI activity. We report here on the expression in baculovirus vectors of various mutant PDI/beta-subunits together with a wild-type alpha-subunit of the human prolyl 4-hydroxylase alpha 2 beta 2 tetramer in Spodoptera frugiperda insect cells. When either one or both of the -Cys-Gly-His-Cys- sequences was converted to -Ser-Gly-His-Cys-, a tetramer was formed as with wild-type PDI/beta-subunit. This tetramer was fully active prolyl 4-hydroxylase. The data demonstrate that PDI activity of the PDI/beta-subunit is not required for tetramer assembly or for the prolyl 4-hydroxylase activity of the tetramer, and thus other sequences of the PDI/beta-subunit may be critical for keeping the alpha-subunits in a catalytically active, non-aggregated conformation. Measurements of the PDI activities of tetramers containing the various mutant PDI/beta-subunits demonstrated that the activity of the wild-type tetramer is almost exclusively due to the C-terminal PDI catalytic sites, which explains the finding that the PDI activity of the PDI/beta-subunit present in the tetramer is about half that in the free polypeptide.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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