6BQS:
reference: Structural properties of a haemophore facilitate targeted elimination of the pathogen Porphyromonas gingivalis., Gao JL, Kwan AH, Yammine A, Zhou X, Trewhella J, Hugrass BM, Collins DAT, Horne J, Ye P, Harty D, Nguyen KA, Gell DA, Hunter N, Nat Commun. 2018 Oct 5;9(1):4097. doi: 10.1038/s41467-018-06470-0. PMID: 30291238

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