Figure 4.
Figure 4. Stereo views of the structure of the C-cluster in the
subunit.
a, Electron density, contoured at the 1 level,
corresponding to a 2mF[o] - DF[c] difference electron density
map42 using 1.9 Å resolution refined model phases of CO-treated
crystal CO[a]. b, Residual mF[o] - F[c] electron density peaks,
contoured at the 5.5 level,
correponding to (i) a putative persulfide formed between a
labile S atom and Cys316, (ii) an alternative position for the
unique Fe, as indicated by arrows and (iii) alternative
conformations of Cys550. Atoms at alternative positions are
shown as translucid spheres. Atoms are colored as in Fig. 2.
The above figure is reprinted
by permission from Macmillan Publishers Ltd:
Nat Struct Biol
(2003,
10,
271-279)
copyright 2003.
subunit.
a, Electron density, contoured at the 1 
level,
corresponding to a 2mF[o] - DF[c] difference electron density
map42 using 1.9 Å resolution refined model phases of CO-treated
crystal CO[a]. b, Residual mF[o] - F[c] electron density peaks,
contoured at the 5.5