Figure 4 - full size

Figure 4.
Figure 4. Scanning electron micrographs of Streptomyces exfoliatus SMF19 cells. a, Spore formation by septation of wild type hyphae. b, The absence of sporulation in a BLIP-II knock-out mutant produces the so-called 'bald' phenotype. c, Comparison of the structures of TEM-1 -lactamase (orange) and the Streptomyces K15 penicillin binding protein (K15 PBP)30 (blue), highlighting the overall structural similarities. The region in TEM-1 to which BLIP-II binds is colored green, as is the structurally equivalent region in the K15 PBP. The active site Ser-Lys dyads are shown as ball-and-stick renderings.