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. 1996 Aug 1;317(Pt 3):721–729. doi: 10.1042/bj3170721

Baculovirus expression of two protein disulphide isomerase isoforms from Caenorhabditis elegans and characterization of prolyl 4-hydroxylases containing one of these polypeptides as their beta subunit.

J Veijola 1, P Annunen 1, P Koivunen 1, A P Page 1, T Pihlajaniemi 1, K I Kivirikko 1
PMCID: PMC1217545  PMID: 8760355

Abstract

Protein disulphide isomerase (PDI; EC 5.3.4.1) is a multifunctional polypeptide that is identical to the beta subunit of prolyl 4-hydroxylases. We report here on the cloning and expression of the Caenorhabditis elegans PDI/beta polypeptide and its isoform. The overall amino acid sequence identity and similarity between the processed human and C. elegans PDI/beta polypeptides are 61% and 85% respectively, and those between the C. elegans PDI/beta polypeptide and the PDI isoform 46% and 73%. The isoform differs from the PDI/beta and ERp60 polypeptides in that its N-terminal thioredoxin-like domain has an unusual catalytic site sequence -CVHC-. Expression studies in insect cells demonstrated that the C. elegans PDI/beta polypeptide forms an active prolyl 4-hydroxylase alpha 2 beta 2 tetramer with the human alpha subunit and an alpha beta dimer with the C. elegans alpha subunit, whereas the C. elegans PDI isoform formed no prolyl 4-hydroxylase with either alpha subunit. Removal of the 32-residue C-terminal extension from the C. elegans alpha subunit totally eliminated alpha beta dimer formation. The C. elegans PDI/beta polypeptide formed less prolyl 4-hydroxylase with both the human and C. elegans alpha subunits than did the human PDI/beta polypeptide, being particularly ineffective with the C. elegans alpha subunit. Experiments with hybrid polypeptides in which the C-terminal regions had been exchanged between the human and C. elegans PDI/beta polypeptides indicated that differences in the C-terminal region are one reason, but not the only one, for the differences in prolyl 4-hydroxylase formation between the human and C. elegans PDI/beta polypeptides. The catalytic properties of the C. elegans prolyl 4-hydroxylase alpha beta dimer were very similar to those of the vertebrate type II prolyl 4-hydroxylase tetramer, including the K(m) for the hydroxylation of long polypeptide substrates.

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Selected References

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