A negative patch exists around the pore on one face of the HsBBS91–407 β-propeller.
A, electrostatic potential mapped onto the solvent-accessible surface of HsBBS91–407. The electrostatic potential is colored from −5 kT/e (negative, red) to +5 kT/e (positive, blue). Both faces, rotated by 180° with respect to each other, are shown. B, sequence conservation mapped onto the solvent-accessible surface of HsBBS91–407. Conservation is colored from white (not conserved) to orange (conserved), and views are as in A.