Volume 80, Issue 3 pp. 774-789
Research Article

Novel high-affinity binders of human interferon gamma derived from albumin-binding domain of protein G

Jawid N. Ahmad

Jawid N. Ahmad

Institute of Microbiology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

Jawid N. Ahmad and Jingjing Li contributed equally to this work.

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Jingjing Li

Jingjing Li

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

Jawid N. Ahmad and Jingjing Li contributed equally to this work.

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Lada Biedermannová

Lada Biedermannová

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Milan Kuchař

Milan Kuchař

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Hana Šípová

Hana Šípová

Institute of Photonics and Electronics of the ASCR, v. v. i., Chaberská 57, 182 51 Prague, Czech Republic

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Alena Semerádtová

Alena Semerádtová

Faculty of Science, Jan Evangelista Purkyně University, České Mládeže 8, 400 96 Ústí nad Labem, Czech Republic

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Jiří Černý

Jiří Černý

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Hana Petroková

Hana Petroková

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Pavel Mikulecký

Pavel Mikulecký

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Jiří Polínek

Jiří Polínek

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Ondřej Staněk

Ondřej Staněk

Institute of Microbiology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Jiří Vondrášek

Jiří Vondrášek

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Jiří Homola

Jiří Homola

Institute of Photonics and Electronics of the ASCR, v. v. i., Chaberská 57, 182 51 Prague, Czech Republic

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Jan Malý

Jan Malý

Faculty of Science, Jan Evangelista Purkyně University, České Mládeže 8, 400 96 Ústí nad Labem, Czech Republic

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Radim Osička

Radim Osička

Institute of Microbiology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Peter Šebo

Peter Šebo

Institute of Microbiology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

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Petr Malý

Corresponding Author

Petr Malý

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Prague, Czech Republic

Institute of Biotechnology of the ASCR, v. v. i., Vídeňská 1083, 142 20 Praha 4, Czech Republic===Search for more papers by this author
First published: 29 October 2011
Citations: 33

Abstract

Recombinant ligands derived from small protein scaffolds show promise as robust research and diagnostic reagents and next generation protein therapeutics. Here, we derived high-affinity binders of human interferon gamma (hIFNγ) from the three helix bundle scaffold of the albumin-binding domain (ABD) of protein G from Streptococcus G148. Computational interaction energy mapping, solvent accessibility assessment, and in silico alanine scanning identified 11 residues from the albumin-binding surface of ABD as suitable for randomization. A corresponding combinatorial ABD scaffold library was synthesized and screened for hIFNγ binders using in vitro ribosome display selection, to yield recombinant ligands that exhibited Kd values for hIFNγ from 0.2 to 10 nM. Molecular modeling, computational docking onto hIFNγ, and in vitro competition for hIFNγ binding revealed that four of the best ABD-derived ligands shared a common binding surface on hIFNγ, which differed from the site of human IFNγ receptor 1 binding. Thus, these hIFNγ ligands provide a proof of concept for design of novel recombinant binding proteins derived from the ABD scaffold. Proteins 2011. © 2012 Wiley Periodicals, Inc.

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