Figure 2From: Structural studies of the mechanism for biosensing antibiotics in a fluorescein-labeled β-lactamaseCrystal structure of PenP-E166Cf. (a) The fo-fc omit map of fluorescein-5-maleimide contoured at 2.0 σ. (b) The 2fo-fc map of Phe165 to Asn170 and fluorescein-5-maleimide contoured at 1.0 σ. Side chains of Phe165 to Asn170 and Ser70 are shown in cpk cylinder model. Fluorescein is shown in green cylinder model.Back to article page