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Experimental and theoretical analyses of the domain architecture of mammalian protein disulphide-isomerase

Freedman, Robert B., Gane, Paul J., Hawkins, Hilary C., Hlodan, R., McLaughlin, Stephen H., Parry, J.W.L. (1998) Experimental and theoretical analyses of the domain architecture of mammalian protein disulphide-isomerase. Biological Chemistry, 379 (3). pp. 321-328. ISSN 1431-6730. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

The high resolution structure of full-length protein disulphide-isomerase (PDI) has not been determined, but the polypeptide is generally assumed to comprise a series of consecutive domains. Models of its domain organisation have been proposed on the basis of various sequence-based criteria and, more recently, from structural studies on recombinant fragments corresponding to putative domains. We here describe direct studies of the domain architecture of full-length mammalian PDI based on limited proteolysis of the native enzyme. The results are consistent with an emerging model based on the existence of 4 consecutive domains each with the thioredoxin fold. The model was further tested by expressing recombinant fragments corresponding to alternative domain models and to truncated domains; the observed properties of these purified fragments supported the 4-domain model. A multiple alignment of many PDI-like sequences was generated to test whether domain boundaries could be predicted from any features of the alignment, such as sequence variability or hydrophilicity; neither of these parameters reliably predicted the domain boundaries determined by experiment.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculties > Sciences > School of Biosciences
Depositing User: R.F. Xu
Date Deposited: 29 Jun 2009 10:46 UTC
Last Modified: 28 May 2019 13:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/17746 (The current URI for this page, for reference purposes)
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