Additional file 5.

Different hydrogen bonding patterns in HutZ β6 and HugZ β9. (A) Hydrogen bonding patterns in HutZ β6. Blue sphere: nitrogen atom; red sphere: oxygen atom; green dotted line: hydrogen bond. (B) Hydrogen bonding patterns in HugZ β9. (C) Sequence correspondence based on sequence alignment. Secondary structures are labeled above or under the sequences. Hydrogen bond providing residues are in bold. From the corners up, the hydrogen bonding patterns become irregular. In β6-2 and β9-2, the hydrogen bond providing residues mismatch by one amino acid residue.

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Liu et al. BMC Structural Biology 2012 12:23   doi:10.1186/1472-6807-12-23