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Figure 1.
FIG. 1. Structure and ribose-binding site of RbsD. a,
decameric assembly of RbsD shown in two different orientations.
Ribose molecules bound to the intersubunit clefts are shown as
ball-and-sticks. b, ribbon diagram of RbsD monomer. The
secondary structures are numbered in the order of appearance in
the primary sequence. c, buried ion cage. A negatively charged
ion (in cyan), which is putatively a Cl-, is bound between two
RbsD subunits related by the molecular 2-fold axis that
superimposes the pentameric rings. The symmetry-related pairs
are shown in different colors. Water molecules are in red. Two
histidine residues hydrogen-bonded to the bound water molecules
are shown.
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