Mutations in domain a′ of protein disulfide isomerase affect the folding pathway of bovine pancreatic ribonuclease A

Margherita Ruoppolo, Stefania Orrù, Fabio Talamo, Johanna Ljung, Annamari Pirneskoski, Kari I. Kivirikko, Gennaro Marino, Peppi Koivunen

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Protein disulfide isomerase (PDI, EC 5.3.4.1), an enzyme and chaperone, catalyses disulfide bond formation and rearrangements in protein folding. It is also a subunit in two proteins, the enzyme collagen prolyl 4-hydroxylase and the microsomal triglyceride transfer protein. It consists of two catalytically active domains, a and a′, and two inactive ones, b and b′, all four domains having the thioredoxin fold. Domain b′ contains the primary peptide binding site, but a′ is also critical for several of the major PDI functions. Mass spectrometry was used here to follow the folding pathway of bovine pancreatic ribonuclease A (RNase A) in the presence of three PDI mutants, F449R, Δ455-457, and abb′, and the individual domains a and a′. The first two mutants contained alterations in the last α helix of domain a′, while the third lacked the entire domain a′. All mutants produced genuine, correctly folded RNase A, but the appearance rate of 50% of the product, as compared to wild-type PDI, was reduced 2,5-fold in the case of PDI Δ455-457, 7.5-fold to eightfold in the cases of PDI F449R and PDI abb′, and over 15-fold in the cases of the individual domains a and a′. In addition, PDI F449R and PDI abb′ affected the distribution of folding intermediates. Domains a and a′ catalyzed the early steps in the folding but no disulfide rearrangements, and therefore the rate observed in the presence of these individual domains was similar to that of the spontaneous process.

Original languageEnglish
Pages (from-to)939-952
Number of pages14
JournalProtein Science
Volume12
Issue number5
DOIs
Publication statusPublished - May 1 2003

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Protein Disulfide-Isomerases
Pancreatic Ribonuclease
Disulfides
Mutation
Prolyl Hydroxylases
Protein folding
Thioredoxins
Protein Folding
Enzymes
Mass spectrometry
Mass Spectrometry
Collagen
Binding Sites
Peptides
Proteins

Keywords

  • Mass spectrometry
  • PDI
  • Protein folding
  • RNase A

ASJC Scopus subject areas

  • Biochemistry

Cite this

Mutations in domain a′ of protein disulfide isomerase affect the folding pathway of bovine pancreatic ribonuclease A. / Ruoppolo, Margherita; Orrù, Stefania; Talamo, Fabio; Ljung, Johanna; Pirneskoski, Annamari; Kivirikko, Kari I.; Marino, Gennaro; Koivunen, Peppi.

In: Protein Science, Vol. 12, No. 5, 01.05.2003, p. 939-952.

Research output: Contribution to journalArticle

Ruoppolo, M, Orrù, S, Talamo, F, Ljung, J, Pirneskoski, A, Kivirikko, KI, Marino, G & Koivunen, P 2003, 'Mutations in domain a′ of protein disulfide isomerase affect the folding pathway of bovine pancreatic ribonuclease A', Protein Science, vol. 12, no. 5, pp. 939-952. https://doi.org/10.1110/ps.0242803
Ruoppolo, Margherita ; Orrù, Stefania ; Talamo, Fabio ; Ljung, Johanna ; Pirneskoski, Annamari ; Kivirikko, Kari I. ; Marino, Gennaro ; Koivunen, Peppi. / Mutations in domain a′ of protein disulfide isomerase affect the folding pathway of bovine pancreatic ribonuclease A. In: Protein Science. 2003 ; Vol. 12, No. 5. pp. 939-952.
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AU - Talamo, Fabio

AU - Ljung, Johanna

AU - Pirneskoski, Annamari

AU - Kivirikko, Kari I.

AU - Marino, Gennaro

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AB - Protein disulfide isomerase (PDI, EC 5.3.4.1), an enzyme and chaperone, catalyses disulfide bond formation and rearrangements in protein folding. It is also a subunit in two proteins, the enzyme collagen prolyl 4-hydroxylase and the microsomal triglyceride transfer protein. It consists of two catalytically active domains, a and a′, and two inactive ones, b and b′, all four domains having the thioredoxin fold. Domain b′ contains the primary peptide binding site, but a′ is also critical for several of the major PDI functions. Mass spectrometry was used here to follow the folding pathway of bovine pancreatic ribonuclease A (RNase A) in the presence of three PDI mutants, F449R, Δ455-457, and abb′, and the individual domains a and a′. The first two mutants contained alterations in the last α helix of domain a′, while the third lacked the entire domain a′. All mutants produced genuine, correctly folded RNase A, but the appearance rate of 50% of the product, as compared to wild-type PDI, was reduced 2,5-fold in the case of PDI Δ455-457, 7.5-fold to eightfold in the cases of PDI F449R and PDI abb′, and over 15-fold in the cases of the individual domains a and a′. In addition, PDI F449R and PDI abb′ affected the distribution of folding intermediates. Domains a and a′ catalyzed the early steps in the folding but no disulfide rearrangements, and therefore the rate observed in the presence of these individual domains was similar to that of the spontaneous process.

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