Abstract
The molecular basis of the temperature-sensitive (ts) phenotype of P3/Sabin, the type 3 vaccine strain of poliovirus, was investigated in light of the known correlation between ts and attenuation phenotypes. A phenylalanine at residue 91 of the capsid protein VP3 was a major determinant of both phenotypes, and attenuation and ts could be reverted by the same second-site mutations. The ts phenotype was due to a defect early in the assembly process that inhibited the formation of 14S pentamers, empty capsids, and virions. It was further shown that capsid proteins that were not incorporated into higher-order structures had short half-lives at the nonpermissive temperature.
MeSH Terms
Capsid/genetics,immunology,isolation & purification
Cell Line
Centrifugation, Density Gradient
Humans
Kinetics
Mutation
Phenotype
Poliovirus/genetics,growth & development,immunology
Poliovirus Vaccine, Oral
RNA, Viral/genetics,isolation & purification
Temperature
Vaccines, Attenuated
Chemicals
Poliovirus Vaccine, Oral
RNA, Viral
Vaccines, Attenuated
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Macadam A J
National Institute for Biological Standards and Control, Hertfordshire, United Kingdom.
Ferguson G
Arnold C
Minor P D
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