Bacterial over-expression of functionally active human CT2 (SLC22A16) carnitine transporter

Area of Science:

• Biochemistry
• Molecular Biology
• Membrane Transport

Background:

• Escherichia coli (E. coli) is a common host for human protein over-expression.
• Human protein toxicity in E. coli can limit recombinant protein production.
• The carnitine transporter CT2 (hCT2) is a membrane protein with limited available knowledge.

Purpose of the Study:

• To determine optimal conditions for expressing the human carnitine transporter CT2 (hCT2) in E. coli.
• To obtain functional recombinant hCT2 for further biochemical and structural studies.

Main Methods:

• Cloning the cDNA for human CT2 (hCT2) into the pH6EX3 vector.
• Culturing transformed E. coli strains in the presence and absence of glucose.
• Optimizing IPTG concentration for protein expression.
• Purifying the expressed hCT2 protein.
• Reconstituting purified hCT2 into proteoliposomes.

Main Results:

• Successful expression of human CT2 (hCT2) in E. coli was achieved.
• The purified hCT2 protein was reconstituted into proteoliposomes.
• The reconstituted hCT2 demonstrated functional carnitine transport activity.

Conclusions:

• Optimal expression of hCT2 in E. coli requires specific IPTG concentrations and glucose addition.
• The functionally active hCT2 protein can transport carnitine within proteoliposomes.
• These findings are significant for understanding membrane transporters and have implications for human health due to hCT2's role in pathology.