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Figure 1.
Figure 1 Structure of the wild-type reaction center from R.
sphaeroides. (a) Backbone with the residues that have been found
in a contact site in any one of the three crystal forms. All of
the residues are located in the hydrophilic regions away from
the central membrane-spanning region. The three residues at
which mutations were made are labeled. (b) One of the contact
interactions that is found only in the tetragonal form. Shown
are residues GluL205 of one protein (shaded with atom types
colored) and TyrM76 and LysM110 of a neighboring protein (shaded
light tan). The residues form a bridge and hydrogen bonds that
probably contribute to the high degree of crystalline order of
this form.
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