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Insights on the dynamic behavior of protein disulfide isomerase in the solution environment through the SAXS technique

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Abstract

The dynamic behavior of Protein Disulfide Isomerase (PDI) in an aqueous solution environment under physiologically active pH has been experimentally verified in this study using Small Angle X-ray Scattering (SAXS) technique. The structural mechanism of dimerization for full-length PDI molecules and co-complex with two renowned substrates has been comprehensively discussed. The structure models obtained from the SAXS data of PDI purified from bovine liver display behavior duality between unaccompanied-enzyme and after engaged with substrates. The analysis of SAXS data revealed that PDI exists as a homo-dimer in the solution environment, and substrate induction provoked its segregation into monomer to enable the enzyme to interact systematically with incoming clients.

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Data avilability

The Small Angle Scattering Biological Data Bank (SASBDB). Editors can access the depositions at the following URLs: https://www.sasbdb.org/data/SASDGZ9/j3szubgaha/https://www.sasbdb.org/data/SASDH22/ngwcjmyyj2/https://www.sasbdb.org/data/SASDH32/za9s4e66vu/https://www.sasbdb.org/data/SASDH42/en5k9t9532/https://www.sasbdb.org/data/SASDH52/gu0rrywqqf/. A full project summary can be located here: https://www.sasbdb.org/project/908/9er70jdgos/.

Abbreviations

PDI:

Protein Disulfide Isomerase

yPDI:

Yeast PDI

hPDI:

Human PDI

SDS:

Sodium dodecyl sulfate

PAGE:

Polyacrylamide gel electrophoresis

SAXS:

Small-angle X-ray scattering

PDB:

Protein data bank

BPTI:

Bovine pancreatic trypsin inhibitor

RNase:

Ribonuclease

BS-RNase:

Bull seminal ribonuclease

TCEP:

Tris(2-carboxyethyl)phosphine

1 M:

One molemM: millimolekDa: kilo Dalton

EDTA:

Ethylene diamine tetraacetic acid;

NaCl:

Sodium chlorideDTT: Dithiothreitol

α1:

Alpha helix 1

α3:

Alpha helix 3

α4:

Alpha helix 4

β4:

Beta-strand 4

References

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Acknowledgements

S.M. and C.S. thank the BioCAT advanced SAXS training course for the static measurement. We also thank Dr. Jesse Hopkins for his assistance in technical details about the instrument, Dr. Srinivas Chakravarthy, and APS 18ID/ BioCAT Beamline for SAXS data collection. This research used resources from the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. "This project was supported by grant 9 P41 GM103622 from the National Institute of General Medical Sciences of the National Institutes of Health". The use of the Pilatus 3 1M detector was provided by grant 1S10OD018090-01 from NIGMS. The content is solely the responsibility of the authors and does not necessarily reflect the official views of the National Institute of General Medical Sciences or the National Institutes of Health. Molecular graphics and analyses were performed with UCSF Chimera, developed by the Resource for Biocomputing, Visualization, and Informatics at the University of California, San Francisco, with support from NIH P41-GM103311.

Funding

This work was supported by the grants from the Department of Biotechnology (DBT) NO.BT/PR13689/BRB/10/820/2010 and University Grants Commission (UGC)-Raman fellowship F.NO.5-1/2013(IC), Government of India.

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Contributions

C.S. and S.B. Designed the research, performed the research, analyzed the data, and wrote the manuscript. T.C. Provided resources and technical assistance. N.V., P.K., and R.B. Provided Technical assistance and suggestions to refine this research. S.M. Designed the research, provided the resources, acquired funds.

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Correspondence to Suresh Kumar Muthuvel.

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40203_2024_198_MOESM1_ESM.docx

Appendix A. Supplementary data. The Supplementary material is available as a separate document which includes the DEAE elution profile, enzyme activity assay results, Size Exclusion elution profile, and SDS-PAGE analysis of PDI purification. Statistics of SAXS analysis, scattering and CRYSOL Goodness of fit Plot for all the protein samples, Comparison of BPTI, and RNase solution structure with the existing crystal structure, SASBDB Accession Codes for the structures determined. Supplementary file1 (DOCX 1511 KB)

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Sanyasi, C., Balakrishnan, S.S., Chinnasamy, T. et al. Insights on the dynamic behavior of protein disulfide isomerase in the solution environment through the SAXS technique. In Silico Pharmacol. 12, 23 (2024). https://doi.org/10.1007/s40203-024-00198-0

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