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Synthesis and structure-activity relationship studies of IgG-binding peptides focused on the C-terminal histidine residue.


ABSTRACT: Currently, IgG-binding peptides are widely utilized as a research tool, as molecules that guide substrates to the Fc site for site-selective antibody modification, leading to preparation of a homogeneous antibody-drug conjugate. In this study, a structure-activity relationship study of an IgG-binding peptide, 15-IgBP, that is focused on its C-terminal His residue was performed in an attempt to create more potent peptides. A peptide with a substitution of His17 by 2-pyridylalanine (2-Pya) showed a good binding affinity (15-His17(2-Pya), K d = 75.7 nM). In combination with a previous result, we obtained 15-Lys8Leu/His17(2-Pya)-OH that showed a potent binding affinity (K d = 2.48 nM) and avoided three synthetic problems concerning the p-hydroxybenzyl amidation at the C-terminus, the difficulty associated with coupling at the His7 position and the racemization of 2-Pya.

SUBMITTER: Muguruma K 

PROVIDER: S-EPMC6855313 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Synthesis and structure-activity relationship studies of IgG-binding peptides focused on the C-terminal histidine residue.

Muguruma Kyohei K   Ito Mayu M   Fukuda Akane A   Kishimoto Satoshi S   Taguchi Akihiro A   Takayama Kentaro K   Taniguchi Atsuhiko A   Ito Yuji Y   Hayashi Yoshio Y  

MedChemComm 20190801 10


Currently, IgG-binding peptides are widely utilized as a research tool, as molecules that guide substrates to the Fc site for site-selective antibody modification, leading to preparation of a homogeneous antibody-drug conjugate. In this study, a structure-activity relationship study of an IgG-binding peptide, 15-IgBP, that is focused on its C-terminal His residue was performed in an attempt to create more potent peptides. A peptide with a substitution of His17 by 2-pyridylalanine (2-Pya) showed  ...[more]

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