Soluble Expression and Efficient Purification of Recombinant Class I Hydrophobin DewA

Area of Science:

• Biochemistry
• Protein Engineering
• Industrial Biotechnology

Background:

• Hydrophobins are small, amphipathic proteins secreted by fungi with diverse industrial applications.
• Current methods for producing recombinant hydrophobins in bacteria often result in low yields due to inclusion body formation and complex refolding steps.

Purpose of the Study:

• To achieve soluble expression and efficient purification of a recombinant class I hydrophobin, DewA, from Aspergillus nidulans in Escherichia coli.
• To develop an industrially viable method for hydrophobin production in prokaryotic hosts.

Main Methods:

• Utilized an N-terminal "ramp tag" strategy for soluble expression of DewA in E. coli, omitting the native signal sequence.
• Employed a modified aqueous two-phase separation technique with isopropyl alcohol for efficient purification of the soluble recombinant hydrophobin.

Main Results:

• Successfully achieved high-level soluble expression of recombinant DewA in E. coli.
• Demonstrated efficient purification of the soluble hydrophobin using the developed aqueous two-phase separation method.

Conclusions:

• The developed tagging and purification strategy enables efficient production of soluble recombinant hydrophobins in E. coli.
• This approach offers a promising solution for the industrial-scale production of hydrophobins from prokaryotic hosts, overcoming previous limitations.