Protein solubility and folding enhancement by interaction with RNA

Area of Science:

• Biochemistry
• Molecular Biology
• Structural Biology

Background:

• Major molecular chaperones are well-understood but assist folding in a limited number of cellular proteins.
• Protein misfolding and aggregation are significant challenges in cellular processes and biotechnology.

Purpose of the Study:

• To investigate a novel protein folding mechanism facilitated by RNA interaction.
• To explore the potential of RNA as a chaperone to enhance protein solubility and folding.
• To assess the utility of RNA-mediated chaperoning for high-throughput protein expression.

Main Methods:

• Attaching an RNA-binding module to the N-terminus of aggregation-prone proteins.
• Conducting in vitro refolding experiments with RNA.
• Coexpressing RNA molecules in vivo.
• Utilizing mutants with impaired RNA binding capabilities.

Main Results:

• RNA binding to the N-terminal module promotes passenger protein solubility and proper folding.
• RNA demonstrates a chaperoning effect on bound proteins, favoring productive folding over aggregation.
• RNA-mediated solubility enhancement significantly increases soluble protein yield.

Conclusions:

• RNA can act as a chaperone, influencing protein folding pathways towards productive folding.
• This RNA-mediated chaperone mechanism offers a robust method for enhancing protein solubility and yield.
• The findings provide new insights into de novo protein folding in vivo and have implications for genomic research.