4jet

2.2A resolution structure of Holo hemophore HasA from Yersinia pestis

spinqualitylabelsall models 4jet, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4jet is a 10 chain structure with sequence from Yersinia pestis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: CL, HEM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q0WA92_YERPE Publication Abstract from PubMed Hemophores from Serratia marcescens (HasAsm) and Pseudomonas aeruginosa (HasAp) bind hemin between two loops, which harbor the axial ligands H32 and Y75. Hemin binding to the Y75 loop triggers closing of the H32 loop and enables binding of H32. Because Yersinia pestis HasA (HasAyp) presents a Gln at position 32, we determined the structures of apo- and holo-HasAyp. Surprisingly, the Q32 loop in apo-HasAyp is already in the closed conformation, but no residue from the Q32 loop binds hemin in holo-HasAyp. In agreement with the minimal reorganization between the apo- and holo-structures, the hemin on-rate is too fast to detect by conventional stopped-flow measurements. The Hemophore HasA from Yersinia pestis (HasAyp) Coordinates Hemin with a Single Residue, Tyr75, and with Minimal Conformational Change.,Kumar R, Lovell S, Matsumura H, Battaile KP, Moenne-Loccoz P, Rivera M Biochemistry. 2013 Apr 23;52(16):2705-7. doi: 10.1021/bi400280z. Epub 2013 Apr, 11. PMID:23578210 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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