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The human Mr 90,000 heat shock protein and the Escherichia coli Lon protein share an antigenic determinant
D S Latchman1, W L Chan, C E Leaver
1Department of Zoology, University College London, UK.
Abstract:
1. A monoclonal antibody (TG7A) reacts with a Mr 90,000 mammalian protein, accumulating during virus infection and heat shock. 2. This protein is encoded by a member of the Mr 90,000 heat shock gene family present in a range of organisms form yeast to man. 3. The antibody also recognises a Mr 94,000 protein in E. coli which similarly accumulates in virus infection and heat shock. 4. This protein has been identified as the Lon protease of E. coli. 5. The shared epitope and similar stress inducibility of the two proteins suggests that a functional and/or evolutionary relationship exists between them.
Insights
A novel monoclonal antibody (TG7A) identifies a 90,000 molecular weight (Mr) heat shock protein in mammals and a 94,000 Mr Lon protease in E. coli. Both proteins accumulate during cellular stress, suggesting a conserved functional or evolutionary link.
Area of Science:
- Molecular Biology
- Microbiology
- Immunology
Background:
- Heat shock proteins (HSPs) play crucial roles in cellular stress response.
- Monoclonal antibodies are vital tools for protein identification and characterization.
- The Lon protease in E. coli is involved in protein degradation and stress adaptation.
Purpose of the Study:
- To characterize a mammalian Mr 90,000 protein that accumulates during stress.
- To investigate the cross-reactivity of the monoclonal antibody (TG7A) with bacterial proteins.
- To explore potential functional or evolutionary relationships between mammalian stress proteins and bacterial proteases.
Main Methods:
- Monoclonal antibody production and characterization (TG7A).
- Western blot analysis to detect protein accumulation under stress conditions (virus infection, heat shock).
- Protein identification using antibody cross-reactivity and known molecular weights.
Main Results:
- Monoclonal antibody TG7A recognized a Mr 90,000 mammalian protein induced by virus infection and heat shock.
- The antibody also detected a Mr 94,000 protein in E. coli, identified as the Lon protease, which showed similar stress-induced accumulation.
- Both proteins share an epitope and exhibit similar stress inducibility.
Conclusions:
- The Mr 90,000 mammalian protein is likely a member of the Mr 90,000 heat shock gene family.
- A conserved functional and/or evolutionary relationship may exist between the mammalian Mr 90,000 stress protein and E. coli Lon protease.
- The TG7A antibody serves as a valuable tool for studying stress responses across different organisms.