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![[Figure 7]](jb5026fig7mag.jpg)
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Figure 7
Structural aspects of β-links in β-barrels. (a) Diagram of the β-sheet of a β-barrel opened out and flattened, showing the stagger of the strands. The β-links are shown in red, with the hydrogen bonds of the β-bulge component represented as red broken lines. The second strand adjacent to the strand containing the β-turn of the β-link is shown in green, and the presence (2) or absence (1) of potential hydrogen bonding to it is indicated by the grey gradient projected from the N-terminal two residues of the β-turn. The two β-links have been placed as if both were at the top of the barrel. The asterisk indicates the position of the frequently associated classic β-bulge, shown in (b). (b) Hydrogen-bonding pattern of the combination of β-link and classic β-bulge found in many β-barrels. (c) Ribbon diagram showing the position of the β-link/β-bulge structure, coloured red, in the five-stranded barrel of eIF5a [PDB entry 1bkb; Peat et al., 1998  ; also for (b)]: SCOPe domain d1dkba2, SCOPe family b.40.4.5. (d) As in (c), but a backbone diagram with the β-link/β-bulge combination coloured CPK, the remaining parts of the three strands on which they occur salmon pink, and the rest of the β-barrel white. |
![[Figure 7]](jb5026fig7.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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