Genetic mapping of the determinants of plaque morphology of coxsackievirus B4.
The genetic determinants of plaque size of two variants of coxsackie-virus B4, CB4-P and CB4-V, were identified using a panel of recombinant, chimeric viruses. When grown in monkey kidney cells, CB4-V yielded large plaques with an average size of 1.0 cm while CB4-P yielded small plaques with an average size of 0.4 cm. Two genetic domains, the 5' untranslated region and the VP4 gene sequence, independently influenced plaque size. Recombinant viruses containing the CB4-P genetic background with point mutations in either the VP1 or VP2 coding sequences had small plaque phenotypes. However, two additional chimerics containing the CB4-P genetic background with either a point mutation in the VP4 sequence or four substitutions in the 5' untranslated region, had large plaque phenotypes. Plaque size correlated with growth kinetics under single-step conditions. Large-plaque variants replicated to higher titers than small-plaque variants. Comparison of the growth kinetics of the recombinant viruses revealed some differences in viral replication. These data suggest that both the 5' untranslated region and arg-16 of VP4 influence viral replication but at different stages of the replication cycle.
Ramsingh
A I
AI
Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany, USA.
Caggana
M
M
Ronstrom
S
S
D000818:Animals; D002213:Capsid / Q000235:genetics*; D036022:Capsid Proteins; D002460:Cell Line; D002678:Chimera; D029822:Enterovirus B, Human / Q000235:genetics* / Q000254:growth & development*; D005814:Genes, Viral; D014644:Genetic Variation; D000882:Haplorhini; D007668:Kidney; D010641:Phenotype; D017354:Point Mutation; D011995:Recombination, Genetic; D015183:Restriction Mapping; D010948:Viral Plaque Assay
D036022:Capsid Proteins; C442554:VP2 protein, Echovirus; C060339:VP4 protein, Rotavirus