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Slow conformational changes in protein folding can be accelerated by enzymes
Biomedica Biochimica Acta
|January 1, 1991
Summary
Protein folding, crucial for cellular function, involves cis/trans isomerization catalyzed by peptidyl-prolyl-cis/trans-isomerases (PPIases). The study explores PPIase roles in folding and their connection to immunosuppression.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Protein folding is a spontaneous process influenced by amino acid sequence and cellular events.
- Peptidyl-prolyl-cis/trans-isomerase (PPIase) enzymes catalyze proline-limited folding steps.
- Cyclophilins (Cyp) are PPIases that bind immunosuppressants like cyclosporin A (CsA).
Purpose of the Study:
- To investigate the role of PPIases in cellular protein folding.
- To explore the relationship between PPIase activity, protein folding, and immunosuppression.
- To discuss potential functions of newly discovered PPIase families.
Main Methods:
- Analysis of protein sequences and structures.
- Review of existing literature on PPIase function and drug interactions.
- Discussion of experimental evidence and theoretical considerations.
Main Results:
- PPIases, including cyclophilins, are involved in catalyzing cis/trans isomerization of Xaa-Pro peptide bonds during protein folding.
- The structural similarity between different PPIase families suggests conserved functions.
- The precise link between PPIase-mediated folding and immunosuppression remains unclear.
Conclusions:
- PPIases play a significant role in protein folding kinetics within cells.
- Further research is needed to elucidate the connection between PPIase enzymatic activity, protein folding, and the mechanism of immunosuppression.
- The discovery of new PPIase families broadens the scope of their potential cellular functions beyond catalysis.