Engineering a Yellow Thermostable Fluorescent Protein by Rational Design

Area of Science:

• Biochemistry
• Protein Engineering
• Fluorescence Microscopy

Background:

• Synthetic fluorescent proteins offer unique properties but can have limitations.
• Thermal Green Protein (TGP) is highly stable and soluble but has lower quantum yield than natural counterparts.
• Existing fluorescent proteins may not withstand harsh experimental conditions.

Purpose of the Study:

• To enhance the thermal recovery and stability of synthetic fluorescent proteins.
• To engineer a yellow fluorescent protein variant with improved characteristics.
• To provide novel fluorescent tools for applications under extreme environments.

Main Methods:

• Introduction of a Q66E chromophore mutation to improve TGP thermal recovery.
• Development of a Yellow Thermal Protein (YTP) through histidine 193 to tyrosine mutation.
• Incorporation of the Q66E mutation into YTP, creating YTP-E, to assess chemostability and pH stability.

Main Results:

• The Q66E mutation improved the thermal recovery of TGP.
• YTP was successfully engineered with yellow fluorescence.
• YTP-E demonstrated enhanced chemostability and pH stability compared to TGP-E.
• Both YTP and YTP-E exhibited superior thermostability over TGP and TGP-E.

Conclusions:

• Engineered fluorescent proteins YTP and YTP-E offer superior thermostability and chemical resistance.
• These novel proteins provide valuable alternatives for fluorescence applications under harsh conditions.
• The study expands the toolkit of stable fluorescent proteins for scientific research.