Fig. 1
From: Bacterial serine protease HtrA as a promising new target for antimicrobial therapy?
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12964-017-0162-5/MediaObjects/12964_2017_162_Fig1_HTML.gif)
Domain structure of HtrA proteins in Gram-negative bacteria. Monomeric DegP and DegQ proteins harbor an N-terminal signal peptide (SP), an ATP-independent trypsin-like protease domain followed by two PDZ domains. Many DegS proteins are composed of a transmembrane domain (TMD), protease domain and one PDZ domain