Cloning and sequencing of 28 kDa outer membrane protein gene of Brucella melitensis Rev. 1

Area of Science:

• Microbiology
• Immunology
• Genetics

Background:

• Brucella melitensis is a zoonotic pathogen of significant global health concern.
• The 28 kDa outer membrane protein (OMP) of B. melitensis is a key immunodominant antigen.
• Understanding the genetic makeup of B. melitensis antigens is crucial for vaccine development and diagnostics.

Purpose of the Study:

• To amplify, clone, and sequence the omp28 gene from Brucella melitensis Rev. 1 strain.
• To characterize the nucleotide sequence of the omp28 gene.
• To identify genetic variations in the omp28 gene compared to other B. melitensis strains.

Main Methods:

• Polymerase Chain Reaction (PCR) was used to amplify the omp28 gene.
• The amplified gene product was cloned into a suitable vector.
• DNA sequencing was performed to determine the nucleotide sequence.
• Sequence analysis was conducted to compare with existing B. melitensis strain sequences.

Main Results:

• A 753 bp PCR product corresponding to the complete omp28 gene was successfully obtained.
• The nucleotide sequence of the omp28 gene from B. melitensis Rev. 1 strain was determined.
• Two nucleotide substitutions were identified when comparing the Rev. 1 strain sequence to the 16M strain sequence.

Conclusions:

• The omp28 gene from Brucella melitensis Rev. 1 strain has been successfully sequenced.
• Genetic variations exist in the omp28 gene between different B. melitensis strains.
• These findings contribute to the molecular understanding of B. melitensis immunodominant antigens.