Clostridium bifermentans
Clostridium bifermentans (CLOBI) is an anaerobic, motile, gram-positive bacterium. Toxins and mosquito larvae. A certain subspecies, "Clostridium bifermentans" subsp. Malaysia, was the first anaerobic bacterium known to kill mosquito larvae. The subspecies was part of a collection at the Institute for Medical Research, Malaysia. A biochemical analysis found that the mosquitocidal cry toxin is coded by four genes in an operon: cry16Aa, cry17Aa, cbm17.1, and cbm17.2. When the four genes were individually expressed, none of the four proteins encoded exhibited mosquitocidal activity. This suggests that the toxicity requires four proteins cooperating as a complex to take effect . A single promoter was found upstream of the four genes, indicating that the four were likely to be expressed simultaneously. The half-life of toxicity was about one day and the toxin was unstable in high temperature. Although "C. bifermentans" subsp. Malaysia is shown to be more lethal to "Anopheles" mosquito larvae, the toxin produced by Cry operon has no mosquitocidal effect on mature "Anopheles" individuals. Thus, the genes accountable for the toxicity towards "Anopheles" are different than those controlled by the cry operon; rather, the toxins selectively target "Aedes" mosquito larvae, in which they cause high mortality. Clostridium bifermentans