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Related Experiment Videos

Wild-type bacteriophage T4 is restricted by the lambda rex genes.

S Shinedling¹, D Parma, L Gold

¹Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder 80309-0347.

Journal of Virology

|December 1, 1987

Summary

Bacteriophage T4 rII genes interact with lambda rex genes, preventing infection. Mutations in T4 motA gene reversed this exclusion, offering new insights into phage-host interactions.

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Area of Science:

Molecular biology
Virology
Genetics

Background:

Bacteriophage T4 rII genes and lambda rex genes exhibit functional interactions.
Lambda rex (r exclusion) genes prevent productive infection by rII mutants.
The rex-rII interaction is quantitative and affects various bacteriophages.

Purpose of the Study:

To investigate the interaction between bacteriophage T4 rII genes and lambda rex genes.
To understand the mechanism of exclusion of T4 by lambda rex.
To identify genetic factors that modulate the rex-mediated exclusion.

Main Methods:

Utilized plasmid clones expressing lambda rex genes.
Assessed the infectivity of bacteriophage T4 (wild type and rII mutants) on rex+ lysogens.

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Introduced mutations in the T4 motA gene to evaluate their effect on exclusion.

Main Results:

Plasmid-expressed rex genes excluded not only rII mutants but also wild-type T4 and other bacteriophages.
Mutations in the T4 motA gene significantly reversed the exclusion of T4 by rex.
Demonstrated a quantitative relationship between rex and rII gene function.

Conclusions:

The lambda rex system broadly excludes bacteriophage infection, with a specific interaction with T4 rII.
The T4 motA gene plays a crucial role in overcoming rex-mediated exclusion.
This study elucidates a complex interplay between phage regulatory genes and host defense mechanisms.