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![[Figure 1]](jb5022fig1mag.jpg)
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Figure 1
The different types of β-bulges and their relationship to composite structures. The singleton is designated `X' and the doubleton residues as `1' and `2' in the N to C direction. In the diagrams, inter-main-chain hydrogen bonds are represented as broken lines, with the red circles representing O atoms and the blue circles representing N atoms. (a) Differentiation of standard and G1 β-bulges on the basis of their conformation at position 1 (yellow). (b) Subclassification of G1 β-bulges into types G1α and G1β on the basis of their conformation at position 0 (light blue). (c) Relationship of G1 β-bulges to larger composite structures: the β-bulge loop-5 and the β-link. Representative backbone three-dimensional structures of the composites in the context of two β-strands are shown below the diagrams, with the four residues of the β-bulge indicated in CPK colours and other residues in white: β-bulge loop (PDB entry 1a2p; Martin et al., 1999  ) and β-link (PDB entry 2sak; Rabijns et al., 1997). |
![[Figure 1]](jb5022fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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