A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1

作者： Eric D. Routh*1, Steven D. Creacy*2, Peter E. Beerbower3, Steven A. Akman4, James P. Vaughn1, Philip J. Smaldino3 1Department of Cancer Biology,Wake Forest School of Medicine, 2YX Genomics, 3Department of Biology,Ball State University, 4Department of Hematology and Oncology,Roper St. Francis Hospital

简介：

Overview

This article presents a method for isolating the G-quadruplex helicase G4 Resolvase1 protein from bacterial systems. The technique utilizes an ATP-dependent purification step to yield nearly pure and catalytically active enzyme, which is essential for various in vitro biochemical assays.

Key Study Components

Area of Science

• Biochemistry
• Protein Purification
• Molecular Biology

Background

• G4 Resolvase1 has a high affinity for G-quadruplex structures.
• It plays a significant role in G4-DNA unwinding in HeLa cells.
• Previous methods struggled to elute catalytically active enzyme from G4 beads.
• ATP was identified as a key factor for effective elution.

Purpose of Study

• To develop a reliable method for purifying G4 Resolvase1 protein.
• To ensure the isolation of catalytically active enzyme.
• To facilitate the use of G4 Resolvase1 in biochemical assays.

Methods Used

• Grow large bacterial cultures expressing G4 Resolvase1.
• Thaw bacterial pellets in TN buffer.
• Utilize ATP for elution of the enzyme from G4 beads.
• Assess the purity and activity of the isolated protein.

Main Results

• The method successfully isolates nearly pure G4 Resolvase1.
• ATP-dependent purification effectively excludes inactive enzymes.
• Isolated enzyme demonstrates high catalytic activity.
• This technique can be applied to various biochemical assays.

Conclusions

• The developed method is efficient for purifying G4 Resolvase1.
• It provides a reliable source of active enzyme for research.
• This approach can enhance studies involving G-quadruplex structures.

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