3KBV
Room temperature structure of D-Xylose Isomerase in complex with 2Ni(2+) co-factors
Summary for 3KBV
| Entry DOI | 10.2210/pdb3kbv/pdb |
| Related | 3KBJ 3KBM 3KBN 3KBS 3KBW 3KCJ 3KCL 3KCO |
| Descriptor | Xylose isomerase, NICKEL (II) ION (3 entities in total) |
| Functional Keywords | xylose isomerase, carbohydrate metabolism, metal-binding, pentose shunt, xylose metabolism, isomerase |
| Biological source | Streptomyces rubiginosus |
| Cellular location | Cytoplasm: P24300 |
| Total number of polymer chains | 1 |
| Total formula weight | 43400.68 |
| Authors | Kovalevsky, A.Y.,Hanson, L.,Langan, P. (deposition date: 2009-10-20, release date: 2010-06-16, Last modification date: 2024-02-21) |
| Primary citation | Kovalevsky, A.Y.,Hanson, L.,Fisher, S.Z.,Mustyakimov, M.,Mason, S.A.,Forsyth, V.T.,Blakeley, M.P.,Keen, D.A.,Wagner, T.,Carrell, H.L.,Katz, A.K.,Glusker, J.P.,Langan, P. Metal ion roles and the movement of hydrogen during reaction catalyzed by D-xylose isomerase: a joint x-ray and neutron diffraction study. Structure, 18:688-699, 2010 Cited by PubMed Abstract: Conversion of aldo to keto sugars by the metalloenzyme D-xylose isomerase (XI) is a multistep reaction that involves hydrogen transfer. We have determined the structure of this enzyme by neutron diffraction in order to locate H atoms (or their isotope D). Two studies are presented, one of XI containing cadmium and cyclic D-glucose (before sugar ring opening has occurred), and the other containing nickel and linear D-glucose (after ring opening has occurred but before isomerization). Previously we reported the neutron structures of ligand-free enzyme and enzyme with bound product. The data show that His54 is doubly protonated on the ring N in all four structures. Lys289 is neutral before ring opening and gains a proton after this; the catalytic metal-bound water is deprotonated to hydroxyl during isomerization and O5 is deprotonated. These results lead to new suggestions as to how changes might take place over the course of the reaction. PubMed: 20541506DOI: 10.1016/j.str.2010.03.011 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.8 Å) |
Structure validation
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