Identification of Tn4430, a transposon of Bacillus thuringiensis functional in Escherichia coli

Area of Science:

• Microbiology
• Molecular Biology
• Genetics

Background:

• Tn4430 is the first transposon identified in the Bacillus genus.
• It was previously known as the Th-sequence in Bacillus thuringiensis.

Purpose of the Study:

• To characterize the mobile genetic element Tn4430.
• To investigate the transposition capabilities of Tn4430.
• To determine the DNA sequence of Tn4430's terminal repeats and insertion site.

Main Methods:

• Insertion of a kanamycin resistance gene (APH-III) into Tn4430.
• Transposition experiments in a Gram-negative host (Escherichia coli).
• Nucleotide sequencing of Tn4430 and its target site on pBR322.

Main Results:

• Tn4430 carrying APH-III demonstrated transposition in Escherichia coli when provided with necessary functions.
• The nucleotide sequence revealed identical 38 bp terminal inverted repeats for Tn4430.
• A 5 bp direct duplication was observed at the target DNA insertion site.

Conclusions:

• Tn4430 exhibits characteristics of the Tn3 family of transposons (Class II elements).
• The study provides insights into the genetic mobility and structural features of Tn4430.