STUDIES OF THE TRANSMISSIBLE AGENT OF THE ROUS CHICKEN SARCOMA I : PRECIPITATION WITH BASIC PROTEINS

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• Rous sarcoma virus (RSV) is an oncogenic retrovirus.
• RSV extracts possess high viscosity, hindering purification and concentration of the active transforming agent.
• Efficient isolation of the RSV active agent is crucial for understanding viral oncogenesis.

Purpose of the Study:

• To develop a method for reducing the viscosity of Rous sarcoma extracts.
• To enable higher concentrations of the active transforming agent.
• To facilitate the purification of the active agent from tumor filtrate components.

Main Methods:

• Treatment of Rous sarcoma extracts with polysaccharide enzymes from *Pneumococcus* or testis.
• Precipitation of the active agent using basic proteins.
• Separation of the precipitated active agent from other filtrate components via electrophoresis.

Main Results:

• Viscosity reduction achieved using polysaccharide enzymes without inactivating the active agent.
• Successful precipitation and isolation of the active agent using basic proteins.
• Electrophoresis effectively separated the active agent from contaminating substances.

Conclusions:

• Polysaccharide enzymes offer a non-destructive method to decrease extract viscosity.
• Basic protein precipitation is a viable strategy for concentrating the active agent.
• Electrophoresis provides a means for purifying the concentrated active agent from Rous sarcoma extracts.