Figure 1 - full size

 

Figure 1.
Fig. 1. Schematic drawings illustrating the structure of P. purpureum CA. A, stereo view of ribbon diagram of a monomer along pseudo 2-fold axis of a monomer. The N- and C-terminal halves and the other parts are colored blue, green, and gray, respectively. -Helices and -strands are shown as ribbons and arrows, respectively. The positions of zinc are shown as red spheres. N and C termini are marked. B, a C trace of the dimer. One monomer is shown in blue, the other in red. The positions of zinc are shown as green spheres. Left, a view looking down along pseudo 2-fold axis of a dimer. Right, a view looking down along 2-fold axis of a dimer. Note that a long turn segment (residues 310-339) connecting the N- and C-terminal halves protrudes out from one monomer to the surface of the counter monomer and has no symmetrical counterpart. Closed circles, black open circles, and red open circles represent 2-fold axis between the dimer, pseudo 2-fold axis between the dimer, and pseudo 2-fold axis within a monomer, respectively.

The above figure is reprinted by permission from the ASBMB: J Biol Chem (2000, 275, 5521-5526) copyright 2000.