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DNA sequences necessary for packaging bacteriophage T3 DNA.

C Hashimoto¹, H Fujisawa

¹Department of Botany, Faculty of Science, Kyoto University, Japan.

|April 1, 1992

Summary

This study identifies essential DNA sequences for T3 phage packaging, revealing that pacCR is crucial for efficient transducer production, while pacCL is dispensable. Transcription from a specific promoter sequence is necessary but not sufficient for packaging.

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Area of Science:

Molecular Biology
Virology
Genetics

Background:

Bacteriophage T3 utilizes a packaging/transduction system involving recombinant plasmids.
Understanding the minimal DNA sequences required for T3 phage packaging is crucial for genetic engineering and viral vector development.

Purpose of the Study:

To determine the minimal DNA sequences essential for T3 phage DNA packaging.
To elucidate the roles of specific processing sites (pacCR and pacCL) and promoter elements in T3 DNA packaging.

Main Methods:

Utilized a recombinant plasmid (pUCE1-TR) packaging/transduction system in T3 phage infections.
Generated and analyzed deletion mutants of the plasmid to assess the impact on packaging efficiency.
Investigated the function of concatemer processing targets (TR) and flanking sequences (E1).

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Main Results:

The pacCR site is essential for efficient packaging, whereas pacCL is dispensable.
A 23-bp segment near the mature right end and a 53-bp sequence containing a T3 RNA polymerase promoter in the E1 region are critical for packaging.
Packaging initiation depends on pacCR, with termination occurring after a headful, while pacCL-independent packaging involves nonspecific initiation and pacCL-dependent termination.

Conclusions:

pacCR is indispensable for T3 DNA packaging and transducer production.
Transcription from the identified promoter is necessary but not sufficient for efficient T3 DNA packaging, suggesting additional regulatory elements are involved.