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Multiple genes coding for octopine-degrading enzymes in Agrobacterium

A L Montoya, L W Moore, M P Gordon

Journal of Bacteriology

|December 1, 1978

Summary

Most Agrobacterium strains that use nopaline also break down octopine. However, octopine degradation genes may be chromosomal, and virulence plasmids appear incompatible, suggesting a shared origin.

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Area of Science:

Microbiology
Plant Pathology
Molecular Biology

Background:

Biotype 2 Agrobacterium tumefaciens and A. radiobacter strains often utilize nopaline and degrade octopine.
Understanding the genetic basis and transfer of these metabolic capabilities is crucial for plant disease management.

Purpose of the Study:

To investigate the genetic location and transferability of octopine degradation genes in Agrobacterium.
To determine the regulation and compatibility of plasmids involved in octopine and nopaline utilization.

Main Methods:

Plasmid transfer experiments to assess gene mobility.
Isolation of mutants to identify chromosomal vs. plasmid-borne genes.
Inducibility and constitutive expression studies of metabolic pathways.
Plasmid transformation assays to evaluate compatibility.

Main Results:

Octopine degradation ability was not efficiently transferred with nopaline utilization genes.
Octopine degradation genes were found to have a chromosomal location in some strains.
Octopine degradation was inducible when plasmid-borne, but constitutive in strains degrading both substrates.
Plasmids conferring octopine utilization were incompatible with nopaline or null-type plasmids.

Conclusions:

The incompatibility of virulence plasmids suggests a common evolutionary origin for major plasmid groups in Agrobacterium.
Genetic location and regulation of octopine degradation vary, with potential chromosomal involvement.
Plasmid incompatibility impacts the co-existence and transfer of metabolic traits.

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