Liposome-mediated cellular delivery of active gp91(phox)

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Gp91(phox) is the catalytic core of neutrophil NADPH oxidase.
• Deficiency in gp91(phox) causes chronic granulomatous disease (CGD), leading to recurrent infections.
• Phagocytes require functional NADPH oxidase to kill microorganisms.

Purpose of the Study:

• To optimize a prokaryotic cell-free system for producing mammalian membrane proteins.
• To generate functional gp91(phox) protein for research and therapeutic applications.

Main Methods:

• Optimization of a prokaryotic cell-free expression system.
• Over-expression of truncated gp91(phox) protein in soluble form.
• Production of proteoliposomes containing recombinant gp91(phox).

Main Results:

• Active, "native-like" conformation gp91(phox) proteins were produced.
• Proteins exhibited diaphorase activity with cytosolic factors and arachidonic acid.
• Proteoliposomes facilitated cellular delivery and plasma membrane relocation of gp91(phox).

Conclusions:

• Cell-free expression technology can produce functional proteoliposomes.
• Recombinant gp91(phox) proteoliposomes mimic cellular counterpart activity.
• This technology supports functional/structural studies and potential protein therapy for CGD.