3TQ0: Crystal Structure Of Leishmania Major Dihydroorotate Dehydrogenase In Complex With Fumarate

Citation:
Abstract
Dihydroorotate dehydrogenase (DHODH) is the fourth enzyme in the de novo pyrimidine biosynthetic pathway and has been exploited as the target for therapy against proliferative and parasitic diseases. In this study, we report the crystal structures of DHODH from Leishmania major, the species of Leishmania associated with zoonotic cutaneous leishmaniasis, in its apo form and in complex with orotate and fumarate molecules. Both orotate and fumarate were found to bind to the same active site and exploit similar interactions, consistent with a ping-pong mechanism described for class 1A DHODHs. Analysis of LmDHODH structures reveals that rearrangements in the conformation of the catalytic loop have direct influence on the dimeric interface. This is the first structural evidence of a relationship between the dimeric form and the catalytic mechanism. According to our analysis, the high sequence and structural similarity observed among trypanosomatid DHODH suggest that a single strategy of structure-based inhibitor design can be used to validate DHODH as a druggable target against multiple neglected tropical diseases such as Leishmaniasis, Sleeping sickness and Chagas' diseases.
PDB ID: 3TQ0Download
MMDB ID: 99668
PDB Deposition Date: 2011/9/8
Updated in MMDB: 2012/08
Experimental Method:
x-ray diffraction
Resolution: 1.9  Å
Source Organism:
Similar Structures:
Biological Unit for 3TQ0: dimeric; determined by author and by software (PISA)
Molecular Components in 3TQ0
Label Count Molecule
Proteins (2 molecules)
2
Dihydroorotate Dehydrogenase
Molecule annotation
Chemicals (11 molecules)
1
2
2
2
3
2
4
1
5
4
* Click molecule labels to explore molecular sequence information.

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