1JJK

Selenomethionine Substitution of Orotidine-5'-monophosphate Decarboxylase from E. coli Causes a Change in Crystal Contacts and Space Group

Summary for 1JJK

• Entry DOI: 10.2210/pdb1jjk/pdb
• Related: 1EIX
• Descriptor: OROTIDINE 5'-PHOSPHATE DECARBOXYLASE, 6-HYDROXYURIDINE-5'-PHOSPHATE (2 entities in total)
• Functional Keywords: alpha-beta-barrel, protein-inhibitor complex, homodimer, lyase
• Biological source: Escherichia coli
• Total number of polymer chains: 16
• Total formula weight: 434247.36

Authors

Poulsen, J.-C.N.,Harris, P.,Jensen, K.F.,Larsen, S. (deposition date: 2001-07-06, release date: 2001-08-01, Last modification date: 2024-11-06)

Primary citation

Poulsen, J.C.,Harris, P.,Jensen, K.F.,Larsen, S.
Selenomethionine substitution of orotidine-5'-monophosphate decarboxylase causes a change in crystal contacts and space group.
Acta Crystallogr.,Sect.D, 57:1251-1259, 2001

PubMed Abstract: Orotidine 5'-monophosphate decarboxylase (ODCase) catalyses the decarboxylation of orotidine 5'-monophosphate to uridine 5'-monophosphate, the last step in the de novo biosynthesis of uridine 5'-monophosphate. In order to determine the structure of ODCase from Escherichia coli by the multi-wavelength anomalous dispersion technique, both native and SeMet-substituted proteins have been produced and purified. During the production of SeMet ODCase, it was observed that SeMet was the only amino acid that it was necessary to add to the defined medium during expression. SeMet-substituted ODCase in complex with the inhibitor 1-(5'-phospho-beta-D-ribofuranosyl)barbituric acid crystallizes under similar conditions as the native enzyme. In contrast to the native enzyme, where the crystals belong to the orthorhombic space group P2(1)2(1)2(1), the SeMet-substituted enzyme crystallizes in the monoclinic space group P2(1), with a quadrupling of the volume of the asymmetric unit. Despite the drastic difference in symmetry, the overall crystal packing is effectively identical in the two crystal forms. The change in space group appears to originate in differences in the crystal contacts near the SeMet and Met residues. These differences can be rationalized in terms of SeMet's larger size and hydrophobicity.

PubMed: 11526316
DOI: 10.1107/S0907444901010393

Experimental method

X-RAY DIFFRACTION (3 Å)