1.B.25.1.2
OprE1 (OprE; OccK8) porin (anaerobically induced). May participate in chromate resistance (Rivera et al., 2008). The high-resolution X-ray structure and electrophysiology highlight a very narrow pore. However, transport of natural amino acids and antibiotics, among them ceftazidime, has been demonstrated (Samanta et al. 2018). As in general porins, the internal electric field favors the translocation of polar molecules by gainful energy compensation in the central constriction region. The comparatively narrow pore can undergo a substrate-induced expansion to accommodate relatively large-sized substrates (Samanta et al. 2018).