Targeting less abundant
amino acid residues on the protein surface
may realize site-selective protein modification of natural proteins.
The relative hydrophobicity of tyrosine combined with the π–π
stacking tendency of the aromatic rings results in generally low accessibility.
In this study, site-selective protein modification was achieved by
targeting surface-exposed tyrosine residues without using a genetic
encoding system. Tyrosine residues were modified with N-methylated
luminol derivative under single-electron transfer (SET) reaction conditions.
Horseradish peroxidase (HRP)-catalyzed SET and electrochemically activated
SET modified surface-exposed tyrosine residues selectively. N-Methylated
luminol derivative modified tyrosine residues more efficiently than
4-arylurazole under tyrosine click conditions using HRP and electrochemistry.
Tyrosine residues that are evolutionarily exposed only in the complementarity-determining
region (CDR) of an antibody were selectively modified by tyrosine
click reactions. CDR-modified antibodies were applied to in vivo imaging
and antibody–drug conjugated (ADC).
This study provides early evidence of the beneficial role that vitamin E-bonded dialyzers may have in preventing IDH. Larger controlled trials are needed to confirm this original finding.
The chemical preparation of Quenchbody was achieved using antibody CDR-selective tyrosine click. Using a readily available and quick two-step reaction, we were able to create a sensor molecule whose fluorescence intensity increases in response to antigen.
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