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Figure 1.
FIGURE 1. Structures of RCK domains. A, a single subunit of
the MthK RCK. B, a homodimer of the MthK RCK domain in a
Ca^2+(gold sphere)-bound state. The two subunits are colored red
and cyan. C, a homodimer of the E. coli RCK domain that has no
C-terminal subdomain (Protein Data Bank code 1ID1). D, a
homodimer of the KTN domain from M. jannaschii KtrA in a
NAD-bound state (Protein Data Bank code 1LSS). Each subunit
(ribbon style) and its bound NAD (ball-and-stick) are of the
same color. The C-terminal region right after helix  F was
removed in the construct for crystallization.
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