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Figure 2.
Fig. 2. Structure of 1b11. (A and B) Secondary structure
cartoons of CspA (PDB ID code 1MJC [PDB]
) with template residues 1-36 in dark blue (A) and the S1 domain
from E. coli polynucleotide phosphorylase (PDB ID code 1SRO [PDB]
) with residues 5-45 (as found in 1b11) in dark red (B). (C and
D) 1b11 tetramer (C) and dimer (D) shown with a smoothed
backbone tube; chains A and A' are gray, and B and B' are green.
(E) 1b11 barrel with strand assignments; strands  1- 4
(residues 16-72) of chain A and 5- 6 (residues 73-101) of
chain B are colored as in C and D. Strand 6 is split into 6a and
6b
to indicate its change of direction. (F) 1b11 barrel showing
origin of segments, with strand assignments of parent proteins
marked and colored as in A and B.
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