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Specific monovalent cation effects on modification of reovirus infectivity by chymotrypsin digestion in vitro
Journal of Virology
|June 1, 1973
Abstract:
Specific monovalent cations control the modification of reovirus infectivity by chymotrypsin. Digestion in K(+), Rb(+), or Cs(+) reduces infectivity several logs, whereas in Na(+) or Li(+) digestion markedly enhances infectivity.
Insights
Monovalent cations like potassium and cesium reduce reovirus infectivity after chymotrypsin digestion. In contrast, sodium and lithium significantly increase reovirus infectivity under the same conditions.
Area of Science:
- Virology
- Biochemistry
- Molecular Biology
Background:
- Reovirus infectivity is modulated by proteolytic enzymes.
- The role of specific ions in this process is not fully understood.
Purpose of the Study:
- To investigate the effect of specific monovalent cations on chymotrypsin-mediated reovirus infectivity.
- To determine how different cations influence the interaction between chymotrypsin and reovirus.
Main Methods:
- Reovirus was incubated with chymotrypsin in the presence of various monovalent cations (K+, Rb+, Cs+, Na+, Li+).
- Viral infectivity was measured by plaque assays after digestion.
Main Results:
- Digestion in the presence of K+, Rb+, or Cs+ led to a significant reduction in reovirus infectivity.
- Conversely, digestion in Na+ or Li+ resulted in a marked enhancement of reovirus infectivity.
Conclusions:
- Monovalent cations play a critical role in modulating reovirus infectivity following chymotrypsin digestion.
- The specific cation present dictates whether infectivity is reduced or enhanced, highlighting ion-specific mechanisms in viral entry or assembly.