1GQN
Native 3-dehydroquinase from Salmonella typhi
Summary for 1GQN
| Entry DOI | 10.2210/pdb1gqn/pdb |
| Related | 1L9W 1QFE |
| Descriptor | 3-DEHYDROQUINATE DEHYDRATASE (2 entities in total) |
| Functional Keywords | lyase, 3-dehydroquinate dehydratase, shikimate pathway, a/b barrel |
| Biological source | SALMONELLA TYPHI |
| Total number of polymer chains | 1 |
| Total formula weight | 27654.91 |
| Authors | Lee, W.-H.,Perles, L.A.,Nagem, R.A.P.,Polikarpov, I.,Sawyer, L. (deposition date: 2001-11-26, release date: 2003-11-20, Last modification date: 2023-12-13) |
| Primary citation | Lee, W.-H.,Perles, L.A.,Shrive, A.K.,Hawkins, A.,Sawyer, L.,Polikarpov, I. Comparison of Different Crystal Forms of 3-Dehydroquinase from Salmonella Typhi and its Implications for Enzyme Activity Acta Crystallogr.,Sect.D, 58:798-, 2002 Cited by PubMed Abstract: The type I 3-dehydroquinate dehydratase (DHQase) which catalyses the reversible dehydration of 3-dehydroquinic acid to 3-dehydroshikimic acid is involved in the shikimate pathway for the biosynthesis of aromatic compounds. The shikimate pathway is absent in mammals, which makes structural information about DHQase vital for the rational design of antimicrobial drugs and herbicides. The crystallographic structure of the type I DHQase from Salmonella typhi has now been determined for the native form at 1.78 A resolution (R = 19.9%; R(free) = 24.7%). The structure of the modified enzyme to which the product has been covalently bound has also been determined but in a different crystal form (2.1 A resolution; R = 17.7%; R(free) = 24.5%). An analysis of the three available crystal forms has provided information about the physiological dimer interface. The enzyme relies upon the closure of a lid-like loop to complete its active site. As the lid-loop tends to stay in the closed position, dimerization appears to play a role in biasing the arrangement of the loop towards its open position, thus facilitating substrate access. PubMed: 11976491DOI: 10.1107/S0907444902003918 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.78 Å) |
Structure validation
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