Binding-induced folding of a natively unstructured transcription factor.
Transcription factors are central components of the intracellular regulatory networks that control gene expression. An increasingly recognized phenomenon among human transcription factors is the formation of structure upon target binding. Here, we study the folding and binding of the pKID domain of...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2008-04-01
|
| Series: | PLoS Computational Biology |
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/18404207/?tool=EBI |
| _version_ | 1818722893519912960 |
|---|---|
| author | Adrian Gustavo Turjanski J Silvio Gutkind Robert B Best Gerhard Hummer |
| author_facet | Adrian Gustavo Turjanski J Silvio Gutkind Robert B Best Gerhard Hummer |
| author_sort | Adrian Gustavo Turjanski |
| collection | DOAJ |
| description | Transcription factors are central components of the intracellular regulatory networks that control gene expression. An increasingly recognized phenomenon among human transcription factors is the formation of structure upon target binding. Here, we study the folding and binding of the pKID domain of CREB to the KIX domain of the co-activator CBP. Our simulations of a topology-based Gō-type model predict a coupled folding and binding mechanism, and the existence of partially bound intermediates. From transition-path and Phi-value analyses, we find that the binding transition state resembles the unstructured state in solution, implying that CREB becomes structured only after committing to binding. A change of structure following binding is reminiscent of an induced-fit mechanism and contrasts with models in which binding occurs to pre-structured conformations that exist in the unbound state at equilibrium. Interestingly, increasing the amount of structure in the unbound pKID reduces the rate of binding, suggesting a "fly-casting"-like process. We find that the inclusion of attractive non-native interactions results in the formation of non-specific encounter complexes that enhance the on-rate of binding, but do not significantly change the binding mechanism. Our study helps explain how being unstructured can confer an advantage in protein target recognition. The simulations are in general agreement with the results of a recently reported nuclear magnetic resonance study, and aid in the interpretation of the experimental binding kinetics. |
| first_indexed | 2024-12-17T21:01:52Z |
| format | Article |
| id | doaj.art-bddcbccee18846ce8e35da3c6e082683 |
| institution | Directory Open Access Journal |
| issn | 1553-734X 1553-7358 |
| language | English |
| last_indexed | 2024-12-17T21:01:52Z |
| publishDate | 2008-04-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Computational Biology |
| spelling | doaj.art-bddcbccee18846ce8e35da3c6e0826832022-12-21T21:32:42ZengPublic Library of Science (PLoS)PLoS Computational Biology1553-734X1553-73582008-04-0144e100006010.1371/journal.pcbi.1000060Binding-induced folding of a natively unstructured transcription factor.Adrian Gustavo TurjanskiJ Silvio GutkindRobert B BestGerhard HummerTranscription factors are central components of the intracellular regulatory networks that control gene expression. An increasingly recognized phenomenon among human transcription factors is the formation of structure upon target binding. Here, we study the folding and binding of the pKID domain of CREB to the KIX domain of the co-activator CBP. Our simulations of a topology-based Gō-type model predict a coupled folding and binding mechanism, and the existence of partially bound intermediates. From transition-path and Phi-value analyses, we find that the binding transition state resembles the unstructured state in solution, implying that CREB becomes structured only after committing to binding. A change of structure following binding is reminiscent of an induced-fit mechanism and contrasts with models in which binding occurs to pre-structured conformations that exist in the unbound state at equilibrium. Interestingly, increasing the amount of structure in the unbound pKID reduces the rate of binding, suggesting a "fly-casting"-like process. We find that the inclusion of attractive non-native interactions results in the formation of non-specific encounter complexes that enhance the on-rate of binding, but do not significantly change the binding mechanism. Our study helps explain how being unstructured can confer an advantage in protein target recognition. The simulations are in general agreement with the results of a recently reported nuclear magnetic resonance study, and aid in the interpretation of the experimental binding kinetics.https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/18404207/?tool=EBI |
| spellingShingle | Adrian Gustavo Turjanski J Silvio Gutkind Robert B Best Gerhard Hummer Binding-induced folding of a natively unstructured transcription factor. PLoS Computational Biology |
| title | Binding-induced folding of a natively unstructured transcription factor. |
| title_full | Binding-induced folding of a natively unstructured transcription factor. |
| title_fullStr | Binding-induced folding of a natively unstructured transcription factor. |
| title_full_unstemmed | Binding-induced folding of a natively unstructured transcription factor. |
| title_short | Binding-induced folding of a natively unstructured transcription factor. |
| title_sort | binding induced folding of a natively unstructured transcription factor |
| url | https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/18404207/?tool=EBI |
| work_keys_str_mv | AT adriangustavoturjanski bindinginducedfoldingofanativelyunstructuredtranscriptionfactor AT jsilviogutkind bindinginducedfoldingofanativelyunstructuredtranscriptionfactor AT robertbbest bindinginducedfoldingofanativelyunstructuredtranscriptionfactor AT gerhardhummer bindinginducedfoldingofanativelyunstructuredtranscriptionfactor |