Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences

Abstract The design of superior biologic therapeutics, including antibodies and engineered proteins, involves optimizing their specific ability to bind to disease-related molecular targets. Previously, we developed and applied the Assisted Design of Antibody and Protein Therapeutics (ADAPT) platform...

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Autores principales:	Christopher R. Corbeil, Mahder Seifu Manenda, Traian Sulea, Jason Baardsnes, Marie-Ève Picard, Hervé Hogues, Francis Gaudreault, Christophe Deprez, Rong Shi, Enrico O. Purisima
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Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/32593c24308a497ea7ce2a68ef263f47
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spelling	oai:doaj.org-article:32593c24308a497ea7ce2a68ef263f472021-11-08T10:52:07ZRedesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences10.1038/s41598-021-00669-w2045-2322https://doaj.org/article/32593c24308a497ea7ce2a68ef263f472021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00669-whttps://doaj.org/toc/2045-2322Abstract The design of superior biologic therapeutics, including antibodies and engineered proteins, involves optimizing their specific ability to bind to disease-related molecular targets. Previously, we developed and applied the Assisted Design of Antibody and Protein Therapeutics (ADAPT) platform for virtual affinity maturation of antibodies (Vivcharuk et al. in PLoS One 12(7):e0181490, https://doi.org/10.1371/journal.pone.0181490 , 2017). However, ADAPT is limited to point mutations of hot-spot residues in existing CDR loops. In this study, we explore the possibility of wholesale replacement of the entire H3 loop with no restriction to maintain the parental loop length. This complements other currently published studies that sample replacements for the CDR loops L1, L2, L3, H1 and H2. Given the immense sequence space theoretically available to H3, we focused on the virtual grafting of over 5000 human germline-derived H3 sequences from the IGMT/LIGM database increasing the diversity of the sequence space when compared to using crystalized H3 loop sequences. H3 loop conformations are generated and scored to identify optimized H3 sequences. Experimental testing of high-ranking H3 sequences grafted into the framework of the bH1 antibody against human VEGF-A led to the discovery of multiple hits, some of which had similar or better affinities relative to the parental antibody. In over 75% of the tested designs, the re-designed H3 loop contributed favorably to overall binding affinity. The hits also demonstrated good developability attributes such as high thermal stability and no aggregation. Crystal structures of select re-designed H3 variants were solved and indicated that although some deviations from predicted structures were seen in the more solvent accessible regions of the H3 loop, they did not significantly affect predicted affinity scores.Christopher R. CorbeilMahder Seifu ManendaTraian SuleaJason BaardsnesMarie-Ève PicardHervé HoguesFrancis GaudreaultChristophe DeprezRong ShiEnrico O. PurisimaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Christopher R. Corbeil Mahder Seifu Manenda Traian Sulea Jason Baardsnes Marie-Ève Picard Hervé Hogues Francis Gaudreault Christophe Deprez Rong Shi Enrico O. Purisima Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences
description	Abstract The design of superior biologic therapeutics, including antibodies and engineered proteins, involves optimizing their specific ability to bind to disease-related molecular targets. Previously, we developed and applied the Assisted Design of Antibody and Protein Therapeutics (ADAPT) platform for virtual affinity maturation of antibodies (Vivcharuk et al. in PLoS One 12(7):e0181490, https://doi.org/10.1371/journal.pone.0181490 , 2017). However, ADAPT is limited to point mutations of hot-spot residues in existing CDR loops. In this study, we explore the possibility of wholesale replacement of the entire H3 loop with no restriction to maintain the parental loop length. This complements other currently published studies that sample replacements for the CDR loops L1, L2, L3, H1 and H2. Given the immense sequence space theoretically available to H3, we focused on the virtual grafting of over 5000 human germline-derived H3 sequences from the IGMT/LIGM database increasing the diversity of the sequence space when compared to using crystalized H3 loop sequences. H3 loop conformations are generated and scored to identify optimized H3 sequences. Experimental testing of high-ranking H3 sequences grafted into the framework of the bH1 antibody against human VEGF-A led to the discovery of multiple hits, some of which had similar or better affinities relative to the parental antibody. In over 75% of the tested designs, the re-designed H3 loop contributed favorably to overall binding affinity. The hits also demonstrated good developability attributes such as high thermal stability and no aggregation. Crystal structures of select re-designed H3 variants were solved and indicated that although some deviations from predicted structures were seen in the more solvent accessible regions of the H3 loop, they did not significantly affect predicted affinity scores.
format	article
author	Christopher R. Corbeil Mahder Seifu Manenda Traian Sulea Jason Baardsnes Marie-Ève Picard Hervé Hogues Francis Gaudreault Christophe Deprez Rong Shi Enrico O. Purisima
author_facet	Christopher R. Corbeil Mahder Seifu Manenda Traian Sulea Jason Baardsnes Marie-Ève Picard Hervé Hogues Francis Gaudreault Christophe Deprez Rong Shi Enrico O. Purisima
author_sort	Christopher R. Corbeil
title	Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences
title_short	Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences
title_full	Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences
title_fullStr	Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences
title_full_unstemmed	Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences
title_sort	redesigning an antibody h3 loop by virtual screening of a small library of human germline-derived sequences
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/32593c24308a497ea7ce2a68ef263f47
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Redesigning an antibody H3 loop by virtual screening of a small library of human germline-derived sequences

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