Structural highlights
Function[ISDH_STAAM] Binds human plasma haptoglobin-hemoglobin complexes, haptoglobin and hemoglobin. Binds haptoglobin-hemoglobin complexes with significantly higher affinity than haptoglobin alone (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedTo elucidate the heme acquisition system in pathogenic bacteria, we investigated the heme-binding properties of the third NEAT domain of IsdH (IsdH-NEAT3), a receptor for heme located on the surfaces of pathogenic bacterial cells, by using x-ray crystallography, isothermal titration calorimetry, examination of absorbance spectra, mutation analysis, size-exclusion chromatography, and analytical ultracentrifugation. We found the following: 1) IsdH-NEAT3 can bind with multiple heme molecules by two modes; 2) heme was bound at the surface of IsdH-NEAT3; 3) candidate residues proposed from the crystal structure were not essential for binding with heme; and 4) IsdH-NEAT3 was associated into a multimeric heme complex by the addition of excess heme. From these observations, we propose a heme-binding mechanism for IsdH-NEAT3 that involves multimerization and discuss the biological importance of this mechanism. Structural basis for multimeric heme complexation through a specific protein-heme interaction: the case of the third neat domain of IsdH from Staphylococcus aureus.,Watanabe M, Tanaka Y, Suenaga A, Kuroda M, Yao M, Watanabe N, Arisaka F, Ohta T, Tanaka I, Tsumoto K J Biol Chem. 2008 Oct 17;283(42):28649-59. Epub 2008 Jul 30. PMID:18667422[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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