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Figure 3.
Fig. 3. Model of the SAM domain oligomer. (A) Ribbon diagram.
Packing of the monomer with a combination of arm-exchange
interfaces and b-region interfaces creates an oligomer. In the
ribbon diagram, the S- and L-forms are colored yellow and blue
as in Fig. 1. (B) Surface diagram. Each monomer is rendered with
a unique color to illustrate the packing at each interface. A
1.4 Å probe radius was used to calculate the molecular
surface area. This figure was made with MOLMOL (33). (C)
Electrostatic potential surface of the oligomer. The asymmetric
distribution of charge on each face of the oligomer is shown.
Red is negative, white is neutral, and blue is positive. The
electrostatic surface was contoured between  10 k[B]T/e
and +10 k[B]T/e, where k[B] is the Boltzmann constant, T is
temperature, and e is the electronic charge. This figure was
made with GRASP (33).
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