The device bacteriophage is rather uniform — relations between phages and bacteria are essentially more various. They represent the whole spectrum: from commensalism to terrible parasitism. And each type of relations is made out by special biochemical means. A photo from a site mansfield.osu.edu.
The European scientists have deciphered one of stages of work of immune system CRISPR at bacteria. Though this system and widespread among bacteria and archaea, its components in many cases appeared highly specific. Besides, the enzymes participating in registration of the immune answer, have not been connected in any way with other sites of a bacterial metabolism. Now scientists have shown that on one of necessary stages of work CRISPR of a bacterium use, first, universal enzyme RNase, and secondly, extended at eukaryotes the mechanism of preparation of the immune answer, similar to the RNK-INTERFERENCE. Thus, there was a possibility more substantially to interpret an origin and evolution of immunity at bacteria.