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Circumventing the stability-function trade-off in an engineered FN3 domain
The favorable biophysical attributes of non-antibody scaffolds make them attractive alternatives to monoclonal antibodies. However, due to the well-known stability-function trade-off, these gains tend to be marginal after functional selection. A notable example is the fibronectin Type III (FN3) doma...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5081044/ https://www.ncbi.nlm.nih.gov/pubmed/27578887 http://dx.doi.org/10.1093/protein/gzw046 |
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author | Porebski, Benjamin T. Conroy, Paul J. Drinkwater, Nyssa Schofield, Peter Vazquez-Lombardi, Rodrigo Hunter, Morag R. Hoke, David E. Christ, Daniel McGowan, Sheena Buckle, Ashley M. |
author_facet | Porebski, Benjamin T. Conroy, Paul J. Drinkwater, Nyssa Schofield, Peter Vazquez-Lombardi, Rodrigo Hunter, Morag R. Hoke, David E. Christ, Daniel McGowan, Sheena Buckle, Ashley M. |
author_sort | Porebski, Benjamin T. |
collection | PubMed |
description | The favorable biophysical attributes of non-antibody scaffolds make them attractive alternatives to monoclonal antibodies. However, due to the well-known stability-function trade-off, these gains tend to be marginal after functional selection. A notable example is the fibronectin Type III (FN3) domain, FNfn10, which has been previously evolved to bind lysozyme with 1 pM affinity (FNfn10-α-lys), but suffers from poor thermodynamic and kinetic stability. To explore this stability-function compromise further, we grafted the lysozyme-binding loops from FNfn10-α-lys onto our previously engineered, ultra-stable FN3 scaffold, FN3con. The resulting variant (FN3con-α-lys) bound lysozyme with a markedly reduced affinity, but retained high levels of thermal stability. The crystal structure of FNfn10-α-lys in complex with lysozyme revealed unanticipated interactions at the protein–protein interface involving framework residues of FNfn10-α-lys, thus explaining the failure to transfer binding via loop grafting. Utilizing this structural information, we redesigned FN3con-α-lys and restored picomolar binding affinity to lysozyme, while maintaining thermodynamic stability (with a thermal melting temperature 2-fold higher than that of FNfn10-α-lys). FN3con therefore provides an exceptional window of stability to tolerate deleterious mutations, resulting in a substantial advantage for functional design. This study emphasizes the utility of consensus design for the generation of highly stable scaffolds for downstream protein engineering studies. |
format | Online Article Text |
id | pubmed-5081044 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-50810442016-10-27 Circumventing the stability-function trade-off in an engineered FN3 domain Porebski, Benjamin T. Conroy, Paul J. Drinkwater, Nyssa Schofield, Peter Vazquez-Lombardi, Rodrigo Hunter, Morag R. Hoke, David E. Christ, Daniel McGowan, Sheena Buckle, Ashley M. Protein Eng Des Sel Original Article The favorable biophysical attributes of non-antibody scaffolds make them attractive alternatives to monoclonal antibodies. However, due to the well-known stability-function trade-off, these gains tend to be marginal after functional selection. A notable example is the fibronectin Type III (FN3) domain, FNfn10, which has been previously evolved to bind lysozyme with 1 pM affinity (FNfn10-α-lys), but suffers from poor thermodynamic and kinetic stability. To explore this stability-function compromise further, we grafted the lysozyme-binding loops from FNfn10-α-lys onto our previously engineered, ultra-stable FN3 scaffold, FN3con. The resulting variant (FN3con-α-lys) bound lysozyme with a markedly reduced affinity, but retained high levels of thermal stability. The crystal structure of FNfn10-α-lys in complex with lysozyme revealed unanticipated interactions at the protein–protein interface involving framework residues of FNfn10-α-lys, thus explaining the failure to transfer binding via loop grafting. Utilizing this structural information, we redesigned FN3con-α-lys and restored picomolar binding affinity to lysozyme, while maintaining thermodynamic stability (with a thermal melting temperature 2-fold higher than that of FNfn10-α-lys). FN3con therefore provides an exceptional window of stability to tolerate deleterious mutations, resulting in a substantial advantage for functional design. This study emphasizes the utility of consensus design for the generation of highly stable scaffolds for downstream protein engineering studies. Oxford University Press 2016-11 2016-10-22 /pmc/articles/PMC5081044/ /pubmed/27578887 http://dx.doi.org/10.1093/protein/gzw046 Text en © The Author 2016. Published by Oxford University Press. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com |
spellingShingle | Original Article Porebski, Benjamin T. Conroy, Paul J. Drinkwater, Nyssa Schofield, Peter Vazquez-Lombardi, Rodrigo Hunter, Morag R. Hoke, David E. Christ, Daniel McGowan, Sheena Buckle, Ashley M. Circumventing the stability-function trade-off in an engineered FN3 domain |
title | Circumventing the stability-function trade-off in an engineered FN3 domain |
title_full | Circumventing the stability-function trade-off in an engineered FN3 domain |
title_fullStr | Circumventing the stability-function trade-off in an engineered FN3 domain |
title_full_unstemmed | Circumventing the stability-function trade-off in an engineered FN3 domain |
title_short | Circumventing the stability-function trade-off in an engineered FN3 domain |
title_sort | circumventing the stability-function trade-off in an engineered fn3 domain |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5081044/ https://www.ncbi.nlm.nih.gov/pubmed/27578887 http://dx.doi.org/10.1093/protein/gzw046 |
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