1EB0: Crystal structure of Bacillus pasteurii UreE at 1.85 A, phased by SIRAS. Type I crystal form

Bacillus pasteurii UreE (BpUreE) is a putative chaperone assisting the insertion of Ni(2+) ions in the active site of urease. The x-ray structure of the protein has been determined for two crystal forms, at 1.7 and 1.85 A resolution, using SIRAS phases derived from a Hg(2+)-derivative. BpUreE is composed of distinct N- and C-terminal domains, connected by a short flexible linker. The structure reveals the topology of an elongated homodimer, formed by interaction of the two C-terminal domains through hydrophobic interactions. A single Zn(2+) ion bound to four conserved His-100 residues, one from each monomer, connects two dimers resulting in a tetrameric BpUreE known to be formed in concentrated solutions. The Zn(2+) ion can be replaced by Ni(2+) as shown by anomalous difference maps obtained on a crystal of BpUreE soaked in a solution containing NiCl(2). A large hydrophobic patch surrounding the metal ion site is surface-exposed in the biologically relevant dimer. The BpUreE structure represents the first for this class of proteins and suggests a possible role for UreE in the urease nickel-center assembly.
PDB ID: 1EB0Download
MMDB ID: 18240
PDB Deposition Date: 2001/7/17
Updated in MMDB: 2007/10
Experimental Method:
x-ray diffraction
Resolution: 1.85  Å
Source Organism:
Similar Structures:
Biological Unit for 1EB0: dimeric; determined by author and by software (PQS)
Molecular Components in 1EB0
Label Count Molecule
Proteins (2 molecules)
Urease Accessory Protein Uree
Molecule annotation
Chemical (1 molecule)
* Click molecule labels to explore molecular sequence information.

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