A cloning strategy for the bacteriophage T4 vs gene

Area of Science:

• Molecular Biology
• Enzymology
• Bacteriophage Genetics

Background:

• The bacteriophage T4 vs gene encodes the tau peptide.
• Tau peptide is known to thermally stabilize valyl-tRNA synthetase (EC 6.1.1.9).
• Temperature-sensitive mutations in valyl-tRNA synthetase can be complemented by factors that enhance thermal stability.

Purpose of the Study:

• To successfully clone the bacteriophage T4 vs gene.
• To investigate the functional expression of the T4 vs gene in Escherichia coli.
• To confirm the thermal stabilizing effect of the tau peptide on valyl-tRNA synthetase.

Main Methods:

• Utilized recombinant pBR322-T4 DNA molecules for transformation.
• Transformed Escherichia coli strain CP 790302 (valSts) with the recombinant DNA.
• Selected transformants on selective medium at 43.5 degrees C.

Main Results:

• Identified transformants exhibiting growth at a restrictive temperature (43.5 degrees C).
• Observed properties in transformants consistent with a modified valyl-tRNA synthetase.
• Data support the successful cloning of the T4 vs gene.

Conclusions:

• The bacteriophage T4 vs gene was successfully cloned into Escherichia coli.
• The expressed tau peptide conferred thermal stability to the temperature-sensitive valyl-tRNA synthetase.
• An atypical modification of valyl-tRNA synthetase was observed in the transformed E. coli strain.