Expression and Purification of a Mammalian P2X7 Receptor from Sf9 Insect Cells.

Area of Science:

• Biochemistry
• Molecular Biology
• Neuroscience

Background:

• The P2X7 receptor is an extracellular ATP-gated ion channel unique to eukaryotes.
• Its role in chronic pain and other diseases is significant, but poorly understood due to purification challenges.
• Understanding P2X7 receptor mechanisms requires pure, functional protein.

Purpose of the Study:

• To establish a robust protocol for expressing and purifying the mammalian P2X7 receptor.
• To enable detailed functional and structural studies of the P2X7 receptor.
• To overcome previous limitations in obtaining sufficient quantities of purified P2X7 receptor.

Main Methods:

• Utilized an insect cell-baculovirus expression system for mammalian P2X7 receptor production.
• Expressed P2X7 receptor as a GFP fusion protein in Sf9 insect cells.
• Employed Triton X-100 and dodecyl maltoside for solubilization and purification via Strep-Tactin affinity and size exclusion chromatography.

Main Results:

• Successfully expressed and purified the P2X7 receptor as a GFP fusion protein.
• Achieved approximately 2 mg of purified protein from 6 L of Sf9 cell culture.
• Demonstrated stability of the purified P2X7 receptor in a glycerol buffer for at least 2 months at 4 °C.

Conclusions:

• Developed a detailed and effective protocol for P2X7 receptor purification.
• The method provides a reliable source of purified P2X7 receptor for further research.
• This advancement facilitates deeper investigation into P2X7 receptor function and its role in disease.