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The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs

Intrinsically disordered proteins (IDPs) are abundant in eukaryotic proteomes and preform critical roles in many cellular processes, most often through the association with globular proteins. Despite lacking a stable three‐dimensional structure by themselves, they may acquire a defined conformation...

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Autores principales: Hadži, San, Lah, Jurij
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons, Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9202546/
https://www.ncbi.nlm.nih.gov/pubmed/35762718
http://dx.doi.org/10.1002/pro.4370
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author Hadži, San
Lah, Jurij
author_facet Hadži, San
Lah, Jurij
author_sort Hadži, San
collection PubMed
description Intrinsically disordered proteins (IDPs) are abundant in eukaryotic proteomes and preform critical roles in many cellular processes, most often through the association with globular proteins. Despite lacking a stable three‐dimensional structure by themselves, they may acquire a defined conformation upon binding globular targets. The most common type of secondary structure acquired by these binding motifs entails formation of an α‐helix. It has been hypothesized that such disorder‐to‐order transitions are associated with a significant free energy penalty due to IDP folding, which reduces the overall IDP‐target affinity. However, the exact magnitude of IDP folding penalty in α‐helical binding motifs has not been systematically estimated. Here, we report the folding penalty contributions for 30 IDPs undergoing folding‐upon‐binding and find that the average IDP folding penalty is +2.0 kcal/mol and ranges from 0.7 to 3.5 kcal/mol. We observe that the folding penalty scales approximately linearly with the change in IDP helicity upon binding, which provides a simple empirical way to estimate folding penalty. We analyze to what extent do pre‐structuring and target‐bound IDP dynamics (fuzziness) reduce the folding penalty and find that these effects combined, on average, reduce the folding cost by around half. Taken together, the presented analysis provides a quantitative basis for understanding the role of folding penalty in IDP‐target interactions and introduces a method estimate this quantity. Estimation and reduction of IDP folding penalty may prove useful in the rational design of helix‐stabilized inhibitors of IDP‐target interactions. STATEMENT: The α‐helical binding motifs are ubiquitous among the intrinsically disordered proteins (IDPs). Upon binding their targets, they undergo a disorder‐to‐order transition, which is accompanied by a significant folding penalty whose magnitude is generally not known. Here, we use recently developed statistical‐thermodynamic model to estimate the folding penalties for 30 IDPs and clarify the roles of IDP pre‐folding and bound‐state dynamics in reducing the folding penalty.
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spelling pubmed-92025462022-06-23 The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs Hadži, San Lah, Jurij Protein Sci Full‐length Papers Intrinsically disordered proteins (IDPs) are abundant in eukaryotic proteomes and preform critical roles in many cellular processes, most often through the association with globular proteins. Despite lacking a stable three‐dimensional structure by themselves, they may acquire a defined conformation upon binding globular targets. The most common type of secondary structure acquired by these binding motifs entails formation of an α‐helix. It has been hypothesized that such disorder‐to‐order transitions are associated with a significant free energy penalty due to IDP folding, which reduces the overall IDP‐target affinity. However, the exact magnitude of IDP folding penalty in α‐helical binding motifs has not been systematically estimated. Here, we report the folding penalty contributions for 30 IDPs undergoing folding‐upon‐binding and find that the average IDP folding penalty is +2.0 kcal/mol and ranges from 0.7 to 3.5 kcal/mol. We observe that the folding penalty scales approximately linearly with the change in IDP helicity upon binding, which provides a simple empirical way to estimate folding penalty. We analyze to what extent do pre‐structuring and target‐bound IDP dynamics (fuzziness) reduce the folding penalty and find that these effects combined, on average, reduce the folding cost by around half. Taken together, the presented analysis provides a quantitative basis for understanding the role of folding penalty in IDP‐target interactions and introduces a method estimate this quantity. Estimation and reduction of IDP folding penalty may prove useful in the rational design of helix‐stabilized inhibitors of IDP‐target interactions. STATEMENT: The α‐helical binding motifs are ubiquitous among the intrinsically disordered proteins (IDPs). Upon binding their targets, they undergo a disorder‐to‐order transition, which is accompanied by a significant folding penalty whose magnitude is generally not known. Here, we use recently developed statistical‐thermodynamic model to estimate the folding penalties for 30 IDPs and clarify the roles of IDP pre‐folding and bound‐state dynamics in reducing the folding penalty. John Wiley & Sons, Inc. 2022-06-16 2022-07 /pmc/articles/PMC9202546/ /pubmed/35762718 http://dx.doi.org/10.1002/pro.4370 Text en © 2022 The Authors. Protein Science published by Wiley Periodicals LLC on behalf of The Protein Society. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Full‐length Papers
Hadži, San
Lah, Jurij
The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
title The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
title_full The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
title_fullStr The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
title_full_unstemmed The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
title_short The free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
title_sort free energy folding penalty accompanying binding of intrinsically disordered α‐helical motifs
topic Full‐length Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9202546/
https://www.ncbi.nlm.nih.gov/pubmed/35762718
http://dx.doi.org/10.1002/pro.4370
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