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Structure-Based Rational Design of TcAgo from Thermogladius calderae.
Xiaochen Xie1, Wanping Chen1, Shi Chen1
1State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, China.
Biomolecules
|May 27, 2026
Summary
Engineered thermophilic Argonaute proteins (pAgos) show enhanced activity at moderate temperatures. This cold-adaptation strategy expands their utility for diverse nucleic acid applications, offering versatile tools for molecular biology.
Area of Science:
- Molecular Biology
- Biochemistry
- Enzyme Engineering
Background:
- Thermophilic prokaryotic Argonaute proteins (pAgos) are valuable for nucleic acid manipulation but limited by high-temperature requirements.
- TcAgo, a thermophilic Argonaute nuclease, functions efficiently above 80 °C, but its mechanism and structure are not fully understood.
Purpose of the Study:
- To analyze the structure of the TcAgo ternary complex.
- To engineer TcAgo for enhanced activity at moderate temperatures using insights from cold-adapted enzymes.
Main Methods:
- Structural analysis of the TcAgo ternary complex.
- Rational protein engineering of TcAgo based on structural data and cold-adaptation principles.
- Biochemical characterization of the wild-type and engineered mTcAgo variants.
Main Results:
- A mutant mTcAgo (K574G, D577G) exhibited significantly improved DNA and RNA cleavage activity at 37 °C.
- mTcAgo demonstrated broad guide compatibility (DNA/RNA, 5'OH/5'P modifications), optimal activity at pH 7-8, and a wide temperature range (37-95 °C).
- The engineered enzyme maintained high activity after heat incubation, showed a high melting temperature (~88 °C), and cleaved GC-rich targets under low Mg2+ conditions.
Conclusions:
- Rational cold-adaptation engineering successfully expanded the functional temperature range of thermophilic pAgos.
- mTcAgo represents a versatile nucleic acid tool with enhanced performance at moderate temperatures.
- This engineering approach provides a promising strategy for developing novel pAgo-based molecular tools.
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