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A comparison of the structural polypeptides of five strains of mumps virus
Abstract:
The polypeptide patterns of five strains of mumps virus have been compared under uniform electrophoresis conditions. These strains included the MJ and RW strains, recently isolated from human cerebrospinal fluid, the neuro-adapted Kilham strain and the chick embryo-adapted Enders and Jeryl Lynn strains. A similar pattern of polypeptides, featuring six common and virus-specific species, was obtained with purified virus grown in ovo, in hick embryo fibroblasts (CEF) or in Vero cells. These polypeptides have been designated VP1 (mol. wt. 200000), VP2 (mol. wt. 80000 or 75000), VP3 (mol. wt. 68000), VP4 (mol. wt. 58000), VP5 (mol. wt. 45000), VP6 (mol. wt. 39000). The virus glycoproteins were identified as VP2 and VP4; the nucleocapsid-associated proteins as VP1, VP3 and VP5. Additional polypeptides occurring both in uninfected Vero cells and in uninfected CEFs appeared in polypeptide profiles of purified mumps virus preparations, and could not be designated virus-specific polypeptides. Alhtough strain differences were minimal, we did observe (1) an extra protein, nucleocapsidassociated, in patterns from the chick-adapted Enders strain of mumps virus and (2) strain-dependent variability in the size of VP2.
Insights
This study compared polypeptide patterns of five mumps virus strains, revealing six common virus-specific proteins. Minor strain differences were observed, including an extra protein in the Enders strain.
Area of Science:
- Virology
- Molecular Biology
- Protein Analysis
Background:
- Mumps virus is a significant human pathogen.
- Understanding mumps virus strain diversity is crucial for diagnostics and vaccine development.
- Polypeptide profiling is a key method for characterizing viral proteins.
Purpose of the Study:
- To compare the polypeptide patterns of five distinct mumps virus strains.
- To identify and characterize common and strain-specific viral polypeptides.
- To investigate potential variations in polypeptide profiles linked to viral adaptation.
Main Methods:
- Electrophoresis was used to analyze polypeptide patterns.
- Purified mumps virus was obtained from various sources: chick embryos (in ovo), chick embryo fibroblasts (CEF), and Vero cells.
- Polypeptides were designated based on their molecular weight (VP1-VP6).
Main Results:
- A consistent pattern of six common, virus-specific polypeptides was observed across all tested mumps virus strains and cell types.
- Viral glycoproteins were identified as VP2 and VP4; nucleocapsid-associated proteins as VP1, VP3, and VP5.
- Minimal strain differences were noted, including an additional nucleocapsid-associated protein in the chick-adapted Enders strain and variability in VP2 size.
Conclusions:
- Mumps virus strains exhibit a conserved core polypeptide structure.
- Minor variations in polypeptide profiles exist, potentially related to host adaptation.
- Further research is needed to elucidate the functional significance of observed strain-specific differences.