Single-step purification of recombinant wild-type and mutant HIV-1 reverse transcriptase

Area of Science:

• Biochemistry
• Molecular Biology
• Virology

Background:

• HIV-1 reverse transcriptase (RT) is a critical enzyme for viral replication and a key target for antiviral therapies.
• Efficient and rapid purification of active HIV-1 RT is essential for biochemical studies, drug screening, and structural analysis.
• Existing purification methods can be time-consuming and may impact enzyme activity.

Purpose of the Study:

• To develop a streamlined, single-step purification protocol for HIV-1 recombinant reverse transcriptase.
• To achieve high yields of enzymatically active HIV-1 RT from bacterial lysates.
• To adapt the purification method for various forms of HIV-1 RT, including drug-resistant mutants.

Main Methods:

• A single-step purification procedure using sequential Q- and S-matrix cartridge columns.
• Utilized Tris buffer, overcoming typical cation-exchange incompatibility, for purification near neutral pH and room temperature.
• Applied both medium-pressure and high-pressure liquid chromatography systems for enzyme isolation.

Main Results:

• Successfully purified HIV-1 recombinant reverse transcriptase (both heterodimer and homodimer forms) in less than 2 hours.
• The purified enzyme exhibited high DNA polymerase specific activity.
• The method effectively purified wild-type RT and recombinant proteins with mutations linked to dideoxynucleoside drug resistance.

Conclusions:

• A novel, rapid, and efficient single-step purification method for HIV-1 recombinant reverse transcriptase has been established.
• This protocol yields highly active enzyme suitable for further research, including studies on drug resistance.
• The method's applicability to various RT forms and its speed offer significant advantages over traditional purification techniques.