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Related Experiment Videos

Assembly intermediates among adenovirus type 5 temperature-sensitive mutants.

B Edvardsson, S Ustacelebi, J Williams

    Journal of Virology
    |February 1, 1978
    PubMed
    Summary

    Temperature-sensitive mutants accumulate viral assembly intermediates. These intermediates can be processed into infectious virus upon temperature shift-down, though some degradation also occurs.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Genetics

    Background:

    • Temperature-sensitive (ts) mutants are crucial tools for studying viral replication and assembly.
    • Understanding the kinetics of viral intermediate processing is key to deciphering assembly pathways.

    Purpose of the Study:

    • To investigate the role of viral assembly intermediates in the replication cycle.
    • To characterize the fate of intermediates formed by temperature-sensitive mutants at restrictive temperatures.

    Main Methods:

    • Utilizing temperature-sensitive mutants (ts5, ts19, 6s58) to study viral assembly.
    • Analyzing polypeptide composition of accumulated intermediates.
    • Performing temperature shift-down experiments to assess recovery of infectious virus.

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    Main Results:

    • Three ts mutants accumulated viral assembly intermediates with wild-type polypeptide composition, including precursor proteins pVI, pVII, and pVIII.
    • Mutants ts5 and ts19 showed evidence of precursor cleavage, indicating assembly into defective virions.
    • Rapid recovery of infectious virus in ts19 and ts58 upon shift-down suggested intermediates can be processed, but only a fraction was utilized, with degradation occurring at restrictive temperatures.

    Conclusions:

    • Viral assembly intermediates accumulate in specific temperature-sensitive mutants.
    • These intermediates can be processed into infectious virions, but this pathway is not fully efficient.
    • Degradation of intermediates at restrictive temperatures is a significant factor in viral replication dynamics.