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Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter

Human immunoglobulin heavy chain variable domains (V(H)) are promising scaffolds for antigen binding. However, V(H) is an unstable and aggregation-prone protein, hindering its use for therapeutic purposes. To evolve the V(H) domain, we performed in vivo protein solubility selection that linked antib...

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Autores principales: Kim, Dong-Sik, Song, Hyung-Nam, Nam, Hyo Jung, Kim, Sung-Geun, Park, Young-Seoub, Park, Jae-Chan, Woo, Eui-Jeon, Lim, Hyung-Kwon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4043505/
https://www.ncbi.nlm.nih.gov/pubmed/24892548
http://dx.doi.org/10.1371/journal.pone.0098178
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author Kim, Dong-Sik
Song, Hyung-Nam
Nam, Hyo Jung
Kim, Sung-Geun
Park, Young-Seoub
Park, Jae-Chan
Woo, Eui-Jeon
Lim, Hyung-Kwon
author_facet Kim, Dong-Sik
Song, Hyung-Nam
Nam, Hyo Jung
Kim, Sung-Geun
Park, Young-Seoub
Park, Jae-Chan
Woo, Eui-Jeon
Lim, Hyung-Kwon
author_sort Kim, Dong-Sik
collection PubMed
description Human immunoglobulin heavy chain variable domains (V(H)) are promising scaffolds for antigen binding. However, V(H) is an unstable and aggregation-prone protein, hindering its use for therapeutic purposes. To evolve the V(H) domain, we performed in vivo protein solubility selection that linked antibiotic resistance to the protein folding quality control mechanism of the twin-arginine translocation pathway of E. coli. After screening a human germ-line V(H) library, 95% of the V(H) proteins obtained were identified as V(H)3 family members; one V(H) protein, MG2x1, stood out among separate clones expressing individual V(H) variants. With further screening of combinatorial framework mutation library of MG2x1, we found a consistent bias toward substitution with tryptophan at the position of 50 and 58 in V(H). Comparison of the crystal structures of the V(H) variants revealed that those substitutions with bulky side chain amino acids filled the cavity in the V(H) interface between heavy and light chains of the Fab arrangement along with the increased number of hydrogen bonds, decreased solvation energy, and increased negative charge. Accordingly, the engineered V(H) acquires an increased level of thermodynamic stability, reversible folding, and soluble expression. The library built with the V(H) variant as a scaffold was qualified as most of V(H) clones selected randomly were expressed as soluble form in E. coli regardless length of the combinatorial CDR. Furthermore, a non-aggregation feature of the selected V(H) conferred a free of humoral response in mice, even when administered together with adjuvant. As a result, this selection provides an alternative directed evolution pathway for unstable proteins, which are distinct from conventional methods based on the phage display.
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spelling pubmed-40435052014-06-09 Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter Kim, Dong-Sik Song, Hyung-Nam Nam, Hyo Jung Kim, Sung-Geun Park, Young-Seoub Park, Jae-Chan Woo, Eui-Jeon Lim, Hyung-Kwon PLoS One Research Article Human immunoglobulin heavy chain variable domains (V(H)) are promising scaffolds for antigen binding. However, V(H) is an unstable and aggregation-prone protein, hindering its use for therapeutic purposes. To evolve the V(H) domain, we performed in vivo protein solubility selection that linked antibiotic resistance to the protein folding quality control mechanism of the twin-arginine translocation pathway of E. coli. After screening a human germ-line V(H) library, 95% of the V(H) proteins obtained were identified as V(H)3 family members; one V(H) protein, MG2x1, stood out among separate clones expressing individual V(H) variants. With further screening of combinatorial framework mutation library of MG2x1, we found a consistent bias toward substitution with tryptophan at the position of 50 and 58 in V(H). Comparison of the crystal structures of the V(H) variants revealed that those substitutions with bulky side chain amino acids filled the cavity in the V(H) interface between heavy and light chains of the Fab arrangement along with the increased number of hydrogen bonds, decreased solvation energy, and increased negative charge. Accordingly, the engineered V(H) acquires an increased level of thermodynamic stability, reversible folding, and soluble expression. The library built with the V(H) variant as a scaffold was qualified as most of V(H) clones selected randomly were expressed as soluble form in E. coli regardless length of the combinatorial CDR. Furthermore, a non-aggregation feature of the selected V(H) conferred a free of humoral response in mice, even when administered together with adjuvant. As a result, this selection provides an alternative directed evolution pathway for unstable proteins, which are distinct from conventional methods based on the phage display. Public Library of Science 2014-06-03 /pmc/articles/PMC4043505/ /pubmed/24892548 http://dx.doi.org/10.1371/journal.pone.0098178 Text en © 2014 Kim et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Kim, Dong-Sik
Song, Hyung-Nam
Nam, Hyo Jung
Kim, Sung-Geun
Park, Young-Seoub
Park, Jae-Chan
Woo, Eui-Jeon
Lim, Hyung-Kwon
Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter
title Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter
title_full Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter
title_fullStr Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter
title_full_unstemmed Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter
title_short Directed Evolution of Human Heavy Chain Variable Domain (V(H)) Using In Vivo Protein Fitness Filter
title_sort directed evolution of human heavy chain variable domain (v(h)) using in vivo protein fitness filter
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4043505/
https://www.ncbi.nlm.nih.gov/pubmed/24892548
http://dx.doi.org/10.1371/journal.pone.0098178
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