5FSD: 1.75 A resolution 2,5-dihydroxybenzensulfonate inhibited Sporosarcina pasteurii urease

Citation:
Abstract
The high activity of urease, a Ni(ii) enzyme, has several adverse effects on human health and agriculture, and its modulation needs the use of inhibitors. 1,4-Benzoquinone (BQ) irreversibly inactivates Sporosarcina pasteurii urease (SPU), with first order kinetics for both the inhibitor and the enzyme. This reaction is stoichiometrically quenched in the presence of sulphite. The 2.07 A crystal structure of SPU bound to BQ shows the presence of a 1,4-hydroquinone moiety covalently bound to the thiol group of alphaCys322, a key residue found on the mobile flap regulating the substrate access to the active site. The 1.75 A crystal structure obtained when sulphite is added to a solution of SPU previously incubated with BQ shows the presence of a 2,5-dihydroxy-benzenesulphonate moiety bound to the alphaCys322 thiol group. These data reveal how the active site cysteine reacts with a prototypical BQ moiety, found in a large number of natural substances potentially suitable to control the urease activity.
PDB ID: 5FSDDownload
MMDB ID: 137738
PDB Deposition Date: 2016/1/4
Updated in MMDB: 2016/04
Experimental Method:
x-ray diffraction
Resolution: 1.75  Å
Source Organism:
Similar Structures:
Biological Unit for 5FSD: nonameric; determined by author and by software (PISA)
Molecular Components in 5FSD
Label Count Molecule
Proteins (9 molecules)
3
Urease Subunit Gamma
Molecule annotation
3
Urease Subunit Beta
Molecule annotation
3
Urease Subunit Alpha
Molecule annotation
Chemicals (81 molecules)
1
48
2
18
3
6
4
3
5
6
* Click molecule labels to explore molecular sequence information.

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