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Identifying the Binding Proteins of Small Ligands with the Differential Radial Capillary Action of Ligand Assay DRaCALA

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Published on: March 19, 2021

Preparing recombinant "Split AEP" for protein labeling.

Muge Ma¹, Simon T M Tang¹, Matthew T Dickerson¹

¹School of Chemistry, Cardiff University, Park Place, Cardiff, United Kingdom.

Methods in Enzymology

|October 20, 2023

Summary

This summary is machine-generated.

A new, streamlined protocol significantly simplifies the preparation of the Oldenlandia affinis asparaginyl ligase (OaAEP1) protein labeling tool. This improved method reduces purification time to under 6 hours and enhances enzyme activity and homogeneity.

Keywords:

Asparaginyl endopeptidase Asparaginyl ligase Byproduct quenching OaAEP Peptide ligation

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Area of Science:

Biochemistry
Molecular Biology
Protein Engineering

Background:

Oldenlandia affinis asparaginyl ligase (OaAEP1-C247A) is a valuable tool for protein labeling.
Current preparation methods are laborious, time-consuming, and yield moderate purity.

Purpose of the Study:

To develop a novel, efficient protocol for preparing active OaAEP1.
To improve the homogeneity and catalytic activity of the enzyme.

Main Methods:

Production of cap and core domains as separate entities.
Purification using immobilized metal affinity chromatography (IMAC) and size exclusion chromatography (SEC).
Introduction of D29E mutation to prevent self-cleavage.

Main Results:

Reduced purification time from 2 days to less than 6 hours.
Achieved higher homogeneity and activity with the "split AEP" (OaAEP1-D29E/C247A).
Demonstrated a ~3-fold increase in catalytic efficiency (kcat/KM).

Conclusions:

The novel protocol offers a significantly improved method for preparing OaAEP1 for protein labeling.
The modified enzyme exhibits enhanced properties for biotechnological applications.
A coupled enzymatic and chemical transformation protocol enables efficient protein labeling.