Abstract
Neutrophil beta-defensins have been identified as naturally occurring potent antibacterial cationic peptides serving as effector molecules of innate immunity that provide a first line of defence against pathogens. Considering the broad-spectrum antimicrobial activity against microorganisms and role in innate immunity of the neutrophil beta-defensins, it has been characterized in many livestock species including cattle, sheep, caprine and porcines. Here we report the isolation, cloning, sequencing and expression of precursor bovine neutrophil beta-defensin isolated from Indian water buffalo. Full-length cDNA was amplified using reverse transcription polymerase chain reaction (RT-PCR). The cDNA contained an open reading frame of 192 bp encoding a putative polypeptide of 63 amino acids. Deduced amino acid sequence of buffalo BNBD4 showed varying amino acid identity with the published sequences of related beta-defensins of other domestic ruminant species ranging from 67.18 to 79.68%. Recombinant buffalo defensin was produced in Escherichia coli as fusion protein.
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