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. Author manuscript; available in PMC: 2019 Sep 14.
Published in final edited form as: J Mol Biol. 2018 Jun 23;430(18 Pt B):3251–3265. doi: 10.1016/j.jmb.2018.06.013

Figure 2. Four residue strand connectors.

Figure 2.

A) Clustering of the 4-residue loops and turns of OMBBs. Loops are shown with diamond markers; turns are represented by circle markers. The plus symbols in the i+1 and i+2 plots mark four of the previously defined ideal turn types I, II, I’, and II’ as noted by Guruprasad and Rajkumar (2000). Green: type I; orange: type I’; purple: type II; yellow: type II’; red: unknown; black: no cluster. B) Representative example of each cluster, colored as in A. The red cluster has terminal positions spaced further apart than the other four canonical tight turn types. C and D) Sequence logos for the 4-residue strand connectors. Each position is shown as a column; the number of sequences in a cluster is shown in the subtitle. Amino acid groupings are described in the methods. C) Sequence logos for the 4-residue loops. D) Sequence logos for the 4-residue turns.