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Figure 1.
Figure 1. The overall fold of PsaA. (a) View down the
twofold pseudosymmetry axis relating the domains. Within each
domain, b strands are shown in cyan and a helices in brown; the
domain-connecting helix is colored magenta. The connecting loops
within the N-terminal domain are in yellow, whilst those in the
C-terminal domain are colored green. The four metal-coordinating
residues are shown in ball-and-stick representation, with carbon
atoms colored gray, nitrogen atoms blue and oxygen atoms red.
The Zn2+ is shown in orange. (b) Stereogram of a Ca trace of
PsaA. The b strands are designated A-H and domain a helices a-h;
the location of the Zn2+ (orange) is also shown. The N and C
termini are shown as a blue and a red sphere, respectively, the
observed N terminus being Lys24. Every twentieth Ca atom is
highlighted as a black sphere and labeled. The view direction is
approximately orthogonal to that of (a). Figures were generated
using the programs MOLSCRIPT [39] and RASTER3D [40 and 41].
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