The porcine and human pathogen induces and degrades neutrophil extracellular traps (NETs) . In this study, we investigated the working hypothesis that NET degradation is mediated not only by the known secreted nuclease A (SsnA) but also by a so-far undescribed putative endonuclease A of (designated EndAsuis) homologous to the pneumococcal endonuclease A (EndA). Comparative analysis was conducted to identify differences in localization, expression and function of EndAsuis and SsnA. In contrast to , RNA expression was not substantially different during exponential and stationary growth. Modelling of the 3D structure confirmed a putative DRGH-motif-containing ββα-metal finger catalytic core in EndAsuis. Accordingly, nuclease activity of recombinant EndAsuis with a point-mutated H165 was rescued through imidazol treatment. In accordance with a putative membrane anchor, nuclease activity caused by was not detectable in the supernatant. Importantly, determined nuclease activity of prominently during exponential growth. This activity depended on the presence of Mg but, in contrast to SsnA activity, not on Ca. A pH of 5.4 did not inhibit -encoded nuclease activity during exponential growth. NET degradation of harvested during exponential growth was significantly attenuated in the mutant. In contrast to SsnA, mutagenesis of did not result in a significantly higher susceptibility against the antimicrobial effect mediated by NETs. As degradation of bacterial DNA caused by depended on A and , further functions of both factors in the host–pathogen interaction might be envisioned.


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