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Background  Horizontal gene transfer (HGT) is a movement of genetic information occurring outside of normal mating activities. It is especially common between prokaryotic endosymbionts and their protozoan, insect, and nematode hosts. Although beta carbonic anhydrase (β-CA) plays a crucial role in metabolic functions of many living organisms, the origin of  β-CA  genes in eukaryotic species remains unclear.    Methods  This study was conducted using phylogenetics, prediction of subcellular localization, and identification of β-CA, transposase, integrase, and resolvase genes on the MGEs of bacteria. We also structurally analyzed β-CAs from protozoans, insects, and nematodes and their putative prokaryotic common ancestors, by homology modelling.    Results  Our investigations of a number of target genomes revealed that genes coding for transposase, integrase, resolvase, and conjugation complex proteins have been integrated with  β-CA  gene sequences on mobile genetic elements (MGEs) which have facilitated the mobility of  β-CA  genes from bacteria to protozoan, insect, and nematode species. The prokaryotic origin of protozoan, insect, and nematode β-CA enzymes is supported by phylogenetic analyses, prediction of subcellular localization, and homology modelling.    Conclusion  MGEs form a complete set of enzymatic tools, which are relevant to HGT of  β-CA  gene sequences from prokaryotes to protozoans, insects, and nematodes.    Electronic supplementary material  The online version of this article (doi:10.1186/s13071-016-1415-7) contains supplementary material, which is available to authorized users.

Horizontal transfer of β-carbonic anhydrase genes from prokaryotes to protozoans, insects, and nematodes