Mechanically Triggered Protein Desulfurization.

Area of Science:

• Chemical Biology
• Biochemistry
• Organic Chemistry

Background:

• Native chemical ligation and postligation desulfurization are key techniques in modern chemical protein synthesis.
• Existing desulfurization methods can be harsh and lack functional group compatibility.

Purpose of the Study:

• To develop a novel, robust, and widely applicable protein desulfurization strategy.
• To introduce an ultrasound-induced desulfurization (USID) method for chemical protein synthesis.

Main Methods:

• Utilized ultrasonic energy in a simple cleaning bath with titanium dioxide as a sonosensitizer.
• Applied the USID strategy to various peptides and proteins, including those with sensitive functional groups like thiazolidine and serotonin.
• Investigated the mechanism of USID using low-frequency and low-intensity ultrasonication.

Main Results:

• Demonstrated that ultrasonic energy efficiently triggers clean protein desulfurization.
• Showcased the USID strategy's mild reaction conditions and excellent functional group compatibility.
• Successfully synthesized bioactive cyclopeptides and histone H3.5 using the USID method, even on a multi-hundred-milligram scale.

Conclusions:

• The USID strategy provides a simple, robust, and versatile method for protein desulfurization.
• USID is a mechanically triggered approach with potential for broad adoption in chemical protein synthesis.
• This technique offers advantages in mildness and compatibility over existing desulfurization methods.