Isolation, cloning and bioinformatic analysis of a histaminase encoding gene from chickpea grit landrace (Cicer arietinum L.)

Histamine, an important biogenic amine, is produced by many organisms and play a diverse role in living organisms. Many micro-organisms synthesis and stored histamine in food, especially in canned food products, posing health threat to human. Diamine oxidase or histaminase catalysis histamine in healthy individuals and reduces its harmful side effects. In this study, a full-length cDNA encoding an amine oxidase was isolated from a chickpea (Cicer arietinum) landrace (grit), deposited in Genbank database (KU058599) and cloned in a binary expression vector. The cloned cDNA had an ORF with 2013 bp length encoding a protein with 670 amino acids and a molecular mass of 75.7 KDa. Multiple sequence alignments analysis showed that the active site and important amino acids are highly conserved in E.coli, pea and grit histaminases. Bioinformatics analysis revealed differences in 4 amino acids between grit histaminase and that of GenBank deposited Cicer arietinum amine oxidase (CAA08855). Phylogenetic analysis grouped grit histaminase (KU058599) with plant, especially legume histaminases with 99% bootstrapping.