San Hadži (Author), Jurij Lah (Author)

Abstract

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 prestructuring 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.

Keywords

motiv vezanja;neugodno zvitje;zvitje ob vezanju;kaotičnost;intrinzično neurejeni proteini;peptidni inhibitor;predzvitje;binding motif;folding penalty;folding-upon-binding;fuzziness;intrinsically disordered proteins;peptide inhibitor;prefolding;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
UDC: 577.322
COBISS: 121839363 Link will open in a new window
ISSN: 0961-8368
Views: 71
Downloads: 33
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Other data

Secondary language: Slovenian
Secondary keywords: motiv vezanja;neugodno zvitje;zvitje ob vezanju;kaotičnost;intrinzično neurejeni proteini;peptidni inhibitor;predzvitje;
Type (COBISS): Article
Pages: str. 1-11
Volume: ǂVol. ǂ31
Issue: ǂiss. ǂ7
Chronology: Jul. 2022
DOI: 10.1002/pro.4370
ID: 16736376