RCSB PDB - 3FW5: Crystal structure of Siderocalin (NGAL, Lipocalin 2) complexed with Ferric 4-methyl-catechol (original) (raw)
Iron traffics in circulation bound to a siderocalin (Ngal)-catechol complex.
[Bao, G.](/search?q=citation.rcsb%5Fauthors:Bao, G.), [Clifton, M.](/search?q=citation.rcsb%5Fauthors:Clifton, M.), [Hoette, T.M.](/search?q=citation.rcsb%5Fauthors:Hoette, T.M.), [Mori, K.](/search?q=citation.rcsb%5Fauthors:Mori, K.), [Deng, S.X.](/search?q=citation.rcsb%5Fauthors:Deng, S.X.), [Qiu, A.](/search?q=citation.rcsb%5Fauthors:Qiu, A.), [Viltard, M.](/search?q=citation.rcsb%5Fauthors:Viltard, M.), [Williams, D.](/search?q=citation.rcsb%5Fauthors:Williams, D.), [Paragas, N.](/search?q=citation.rcsb%5Fauthors:Paragas, N.), [Leete, T.](/search?q=citation.rcsb%5Fauthors:Leete, T.), [Kulkarni, R.](/search?q=citation.rcsb%5Fauthors:Kulkarni, R.), [Li, X.](/search?q=citation.rcsb%5Fauthors:Li, X.), [Lee, B.](/search?q=citation.rcsb%5Fauthors:Lee, B.), [Kalandadze, A.](/search?q=citation.rcsb%5Fauthors:Kalandadze, A.), [Ratner, A.J.](/search?q=citation.rcsb%5Fauthors:Ratner, A.J.), [Pizarro, J.C.](/search?q=citation.rcsb%5Fauthors:Pizarro, J.C.), [Schmidt-Ott, K.M.](/search?q=citation.rcsb%5Fauthors:Schmidt-Ott, K.M.), [Landry, D.W.](/search?q=citation.rcsb%5Fauthors:Landry, D.W.), [Raymond, K.N.](/search?q=citation.rcsb%5Fauthors:Raymond, K.N.), [Strong, R.K.](/search?q=citation.rcsb%5Fauthors:Strong, R.K.), [Barasch, J.](/search?q=citation.rcsb%5Fauthors:Barasch, J.)
(2010) Nat Chem Biol 6: 602-609
PubMed Abstract:
The lipocalins are secreted proteins that bind small organic molecules. Scn-Ngal (also known as neutrophil gelatinase associated lipocalin, siderocalin, lipocalin 2) sequesters bacterial iron chelators, called siderophores, and consequently blocks bacterial growth. However, Scn-Ngal is also prominently expressed in aseptic diseases, implying that it binds additional ligands and serves additional functions. Using chemical screens, crystallography and fluorescence methods, we report that Scn-Ngal binds iron together with a small metabolic product called catechol. The formation of the complex blocked the reactivity of iron and permitted its transport once introduced into circulation in vivo. Scn-Ngal then recycled its iron in endosomes by a pH-sensitive mechanism. As catechols derive from bacterial and mammalian metabolism of dietary compounds, the Scn-Ngal-catechol-Fe(III) complex represents an unforeseen microbial-host interaction, which mimics Scn-Ngal-siderophore interactions but instead traffics iron in aseptic tissues. These results identify an endogenous siderophore, which may link the disparate roles of Scn-Ngal in different diseases.
Organizational Affiliation:
College of Physicians and Surgeons of Columbia University, New York, New York, USA.