1KA5:
reference: High-resolution structure of the histidine-containing phosphocarrier protein (HPr) from Staphylococcus aureus and characterization of its interaction with the bifunctional HPr kinase/phosphorylase., Maurer T, Meier S, Kachel N, Munte CE, Hasenbein S, Koch B, Hengstenberg W, Kalbitzer HR, J Bacteriol 2004 Sep;186(17):5906-18. PMID: 15317796

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