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Updated: Jun 8, 2026

Proteome-wide Quantification of Labeling Homogeneity at the Single Molecule Level

Proteome-wide Quantification of Labeling Homogeneity at the Single Molecule Level

Published on: April 19, 2019

Labeling study of avidin by modular method for affinity labeling (MoAL).

Shuichi Nakanishi¹, Hiroyuki Tanaka, Kazuhito Hioki

¹Faculty of Pharmaceutical Sciences, Kanazawa University, Kakuma-machi, Kanazawa, Japan.

Bioorganic & Medicinal Chemistry Letters

|October 16, 2010

Summary

We optimized avidin labeling using biotinylated modular ligand catalysts. Maximum labeling yield was achieved with an octamethylene linker, demonstrating efficient protein modification.

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Area of Science:

Biochemistry
Organic Chemistry
Protein Chemistry

Background:

Avidin is a protein with high affinity for biotin.
Modular ligand catalysts offer precise chemical modification strategies.
MoAL (modular avidin ligation) is a recently developed technique for protein labeling.

Purpose of the Study:

To investigate the specific labeling of avidin using biotinylated modular ligand catalysts via MoAL.
To determine the optimal linker length for efficient avidin labeling.
To understand the catalytic mechanism and kinetics of the labeling reaction.

Main Methods:

Synthesis of biotinylated modular ligand catalysts with varying linker lengths.
Avidin labeling experiments using the MoAL technique.
Analysis of labeling yield and reaction kinetics.
Characterization of the modified avidin.

Main Results:

Labeling yield is dependent on the linker length of the modular ligand catalyst.
Maximum labeling yield was obtained with a catalyst (1d) possessing an octamethylene linker.
The labeling reaction reached maximum rate with 4 equivalents of the ligand catalyst, suggesting saturation of avidin's homotetrameric structure.
The catalyst facilitated N-triazinylation of Lys111 followed by reactions involving Asp108 and CDMT.

Conclusions:

The linker length is a critical factor in optimizing avidin labeling efficiency with biotinylated modular ligand catalysts.
The MoAL technique, utilizing specific modular ligand catalysts, provides an effective method for site-specific protein modification.
The observed kinetics and mechanism suggest a highly efficient catalytic process driven by avidin's high affinity for the biotinylated catalyst.