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Published on: February 15, 2019
SOME PROPERTIES OF THE ENCEPHALOPATHIC AGENT IN PRIMATE BONE MARROW (THE GORDON AGENT)
1Department of Animal and Plant Pathology of The Rockefeller Institute for Medical Research, Princeton, New Jersey.
Abstract:
The nature of the encephalopathic agent present in monkey bone marrow has been investigated. It is readily soluble at a pH of 7.4, as well as at the low pH of 2.0 and 3.0. The point of minimal solubility is pH 4.2. Heat inactivation is produced by a temperature of 75 degrees C., acting for 15 minutes. The agent is digested by pepsin. It exhibits a slight degree of sedimentation with the air-driven centrifuge. It is non-dialyzable. It is precipitated from solution (pH 7.4) by ammonium sulfate, over a range of 0.4 to 0.8 saturation. These findings all suggest that the agent is a protein. No immunological reactions could be elicited.
Insights
Researchers investigated an encephalopathic agent in monkey bone marrow, finding its properties consistent with a protein. This protein agent is heat-inactivated at 75°C and digested by pepsin.
Area of Science:
- Biochemistry
- Virology
- Neuroscience
Background:
- Encephalopathic agents can cause brain dysfunction.
- Understanding the nature of these agents is crucial for disease control.
- Monkey bone marrow has been identified as a potential source of such agents.
Purpose of the Study:
- To characterize the biochemical properties of an encephalopathic agent found in monkey bone marrow.
- To determine if the agent possesses characteristics of known biological molecules.
- To investigate potential therapeutic inactivation methods.
Main Methods:
- Solubility tests across a range of pH values (2.0-7.4).
- Heat inactivation studies at 75°C for 15 minutes.
- Enzymatic digestion with pepsin.
- Sedimentation analysis using an air-driven centrifuge.
- Ammonium sulfate precipitation to assess protein content.
Main Results:
- The agent demonstrated solubility at pH 7.4 and low pH (2.0-3.0), with minimal solubility at pH 4.2.
- Heat treatment at 75°C for 15 minutes inactivated the agent.
- Pepsin digestion degraded the agent.
- The agent was non-dialyzable and showed slight sedimentation.
- Ammonium sulfate precipitation indicated protein characteristics.
Conclusions:
- The investigated encephalopathic agent from monkey bone marrow exhibits properties strongly indicative of a protein.
- Its susceptibility to heat and pepsin suggests a proteinaceous nature.
- Further characterization is needed, but initial findings point towards a protein-based etiology.
