1EU5

STRUCTURE OF E. COLI DUTPASE AT 1.45 A

Summary for 1EU5

• Entry DOI: 10.2210/pdb1eu5/pdb
• Related: 1DUD 1DUP 1EUW
• Descriptor: DEOXYURIDINE 5'-TRIPHOSPHATE NUCLEOTIDOHYDROLASE, GLYCEROL (3 entities in total)
• Functional Keywords: distorted jelly roll, hydrolase
• Biological source: Escherichia coli
• Total number of polymer chains: 1
• Total formula weight: 16486.80

Authors

Gonzalez, A.,Larsson, G.,Persson, R.,Cedergren-Zeppezauer, E. (deposition date: 2000-04-13, release date: 2000-05-03, Last modification date: 2024-02-07)

Primary citation

Gonzalez, A.,Larsson, G.,Persson, R.,Cedergren-Zeppezauer, E.
Atomic resolution structure of Escherichia coli dUTPase determined ab initio.
Acta Crystallogr.,Sect.D, 57:767-774, 2001

PubMed Abstract: Cryocooled crystals of a mercury complex of Escherichia coli dUTPase diffract to atomic resolution. Data to 1.05 A resolution were collected from a derivative crystal and the structure model was derived from a Fourier map with phases calculated from the coordinates of the Hg atom (one site per subunit of the trimeric enzyme) using the program ARP/wARP. After refinement with anisotropic temperature factors a highly accurate model of the bacterial dUTPase was obtained. Data to 1.45 A from a native crystal were also collected and the 100 K structures were compared. Inspection of the refined models reveals that a large part of the dUTPase remains rather mobile upon freezing, with 14% of the main chain being totally disordered and with numerous side chains containing disordered atoms in multiple discrete conformations. A large number of those residues surround the active-site cavity. Two glycerol molecules (the cryosolvent) occupy the deoxyribose-binding site. Comparison between the native enzyme and the mercury complex shows that the active site is not adversely affected by the binding of mercury. An unexpected effect seems to be a stabilization of the crystal lattice by means of long-range interactions, making derivatization a potentially useful tool for further studies of inhibitor-substrate-analogue complexes of this protein at very high resolution.

PubMed: 11375495
DOI: 10.1107/S0907444901004255

Experimental method

X-RAY DIFFRACTION (1.45 Å)