The basis of a bacterial pathogenic process consists in the change of a certain host structure to a completely different one. This is accomplished by binding of a bacterial protein product to the host structure. Streptococcal NAD+-nucleosidase was explored as to its binding to the host receptor represented by beef heart extract. The bacterial product was found to bind to the host structure until the available host structure was fully saturated. The similarity of the above flows of macromolecules with some models of morphogenesis indicates the existence of diseases associated with the flow of a protein to the undesirable site in the organism. In such a case therapy with low-molar-mass substances is wrong in principle.

Institute of Microbiology Faculty of Medicine Charles University 305 99 Plzen Czechia

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