2KDX
Solution structure of HypA protein
Summary for 2KDX
| Entry DOI | 10.2210/pdb2kdx/pdb |
| NMR Information | BMRB: 16126 |
| Descriptor | Hydrogenase/urease nickel incorporation protein hypA, ZINC ION (2 entities in total) |
| Functional Keywords | metallochaperone, hydrogenase, metal-binding, nickel, metal-binding protein, metal binding protein |
| Biological source | Helicobacter pylori (Campylobacter pylori) |
| Total number of polymer chains | 1 |
| Total formula weight | 13430.78 |
| Authors | Xia, W.,Li, H.,Sze, K.-H. (deposition date: 2009-01-20, release date: 2009-10-20, Last modification date: 2024-05-15) |
| Primary citation | Xia, W.,Li, H.,Sze, K.-H.,Sun, H. Structure of a nickel chaperone, HypA, from Helicobacter pylori reveals two distinct metal binding sites J.Am.Chem.Soc., 131:10031-10040, 2009 Cited by PubMed Abstract: Metallochaperones bind metals and ensure the safe delivery of metals to the targets. They are required for the activation and maturation of nickel-containing enzymes [Ni,Fe]-hydrogenase and urease. Metallochaperone HypA was found to be essential to facilitate nickel delivery to hydrogenase together with its partner HypB, although the detailed mechanism is not clear. In this study, we have cloned hypA gene from Helicobacter pylori (strain 26695), overexpressed, and purified the protein. The zinc-bound HypA (Zn-HypA) exists as a monomer in solution, and its solution structure was determined by NMR spectroscopy together with molecular dynamics simulated annealing. Zn-HypA folds into two domains, including a zinc domain and a nickel domain with a mixed alpha/beta structure. The former houses a rigid zinc-binding site possibly with the role of structural stabilization, whereas the latter harbors a nickel-binding site at the N-terminus. Zinc binds to the four conserved cysteines tetrahedrally as evidenced by (113)Cd NMR spectroscopy, and nickel coordinates with four nitrogens of the protein probably in a square-planar geometry. Low coordination number of Ni(2+) may allow the metal to be readily transferred to its downstream receptors. Our studies may shed light on how the metallochaperone exerts its functions in intracellular nickel delivery. PubMed: 19621959DOI: 10.1021/ja900543y PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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