Fig. 3: Positioning of the f1pIV multimer in the E. coli outer membrane.
From: CryoEM structure of the outer membrane secretin channel pIV from the f1 filamentous bacteriophage
a The f1pIV cryoEM map in side view (yellow) shows density that was unaccounted for after the atomic model had been built (purple). b The f1pIV atomic model is shown as space-filled atoms in light grey with the CHAPS shown as purple sticks. There are two bands of aromatic residues shown in yellow (aromatic girdles). The enlarged panels (blue boxes) show the two girdles in greater detail with the aromatic residues labelled. One full molecule of CHAPS, and one consisting only of the aromatic rings (CHAPS*) were modelled in to the ring of density. CHAPS is shown as purple sticks, and the f1pIV subunits are coloured as in Fig. 2b. c f1pIV atomic model shown as surface representation is coloured by hydrophobicity, ranging from the most hydrophilic areas (dark cyan), through white, to the most hydrophobic areas (orange).
