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![[Figure 1]](jv5002fig1mag.jpg)
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Figure 1
Canonical structure of PII proteins. (a) Topology plot of a PII monomer. Structural features such as the B-, C- and T-loops, as well as the post-translational modification site located in the T-loop, are highlighted. (b) PII protein trimer displaying C3 point-group symmetry. Each protomer is depicted in a different color. (c) Hexameric assembly with D3 point-group symmetry of two PII trimers as observed in the crystal structures of unGlnK and adGlnK from C. glutamicum. The symmetry elements present in point groups C3 and D3 are illustrated as follows: black triangles indicate threefold rotation axes oriented perpendicular to the plane of the illustration and black arrows indicate twofold rotation axes located in the plane of the illustration. |
![[Figure 1]](jv5002fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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