Journal article

Dihydroorotase from Escherichia coli: Loop movement and cooperativity between subunits

M Lee, CW Chan, JM Guss, RI Christopherson, MJ Maher

Journal of Molecular Biology | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD | Published : 2005


Escherichia coli dihydroorotase has been crystallized in the presence of the product, L-dihydroorotate (L-DHO), and the structure refined at 1.9A resolution. The structure confirms that previously reported (PDB entry 1J79), crystallized in the presence of the substrate N-carbamyl-D,L-aspartate (D, L-CA-asp), which had a dimer in the asymmetric unit, with one subunit having the substrate, L-CA-asp bound at the active site and the other having L-DHO. Importantly, no explanation for the unusual structure was given. Our results now show that a loop comprised of residues 105-115 has different conformations in the two subunits. In the case of the L-CA-asp-bound subunit, this loop reaches in toward..

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University of Melbourne Researchers