Purification of functional recombinant human mitochondrial Hsp60

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Mitochondrial 60 kDa heat shock protein (mHsp60) is crucial for protein folding, working with Hsp10.
• Human mHsp60 oligomers are unstable and prone to dissociation into inactive monomers, complicating purification.
• Existing methods for mHsp60 purification are challenging due to its inherent instability.

Purpose of the Study:

• To present an improved protocol for purifying functional mitochondrial 60 kDa heat shock protein (mHsp60).
• To enable high-resolution structural and functional analyses of mHsp60 oligomers and their complexes.

Main Methods:

• Expression of mHsp60 in bacteria.
• Purification utilizing affinity chromatography on Ni-NTA-agarose resin.
• Reconstitution of purified monomeric mHsp60 into functional oligomers under controlled conditions.

Main Results:

• Substantial quantities of highly pure and active mHsp60 were obtained.
• The protocol successfully overcomes the instability issues of mHsp60 oligomers.
• The purified mHsp60 is suitable for advanced structural techniques like crystallography and cryo-EM.

Conclusions:

• The developed protocol provides a reliable method for obtaining functional mHsp60 oligomers.
• This advancement facilitates detailed structural and functional investigations of mHsp60.
• The purified protein is ready for use in crystallography and cryo-EM studies.