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Molecular characterization of cDNA encoding B. taurus cathelicidin-7 like antibiotic peptide from bone marrow cells of Bubalus bubalis

Cathelicidins represent a diverse family of endogenous cationic antibiotic peptide present in all mammalian species. In the present study, a novel cathelicidin cDNA was identified and characterized from bone marrow cells of buffalo (Bubalus bubalis) using RT-PCR based approach. The cDNA encodes a propeptide of 1.18 kDa with net positive charge at neutral pH. The precursor peptide possesses a signal peptide of 29 amino acids and a biologically active peptide of 34 residues. Comparison of sequences indicates only 66.1 and 64.1% identity at nucleotides and amino acids level respectively, with the already reported cathelicidin congener from the same species. However, high degree of similarity (92.8% nucleotides and 81.9% amino acids) was noticed with cathelicidin 7 sequence of Bos taurus suggesting interspecies conservation of cathelicidin peptides rather than intra-species within bovidae family. Phylogenetic trees analyses also support these data. Our findings, further justify the cloned cDNA as a unique cathelicidin member of B. bubalis, and may reasonably considered to be another example of structural diversity exhibited by cathelicidin-derived peptides as reported from other mammals.