4PR3 image
Entry Detail
PDB ID:
4PR3
Keywords:
Title:
Crystal structure of Brucella melitensis 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-03-05
Release Date:
2014-04-30
Method Details:
Experimental Method:
Resolution:
2.61 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 65 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:5'-methylthioadenosine nucleosidase / s-adenosylhomocysteine nucleosidase
Chain IDs:A, B
Chain Length:233
Number of Molecules:2
Biological Source:Brucella melitensis bv. 1
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
Crystal structure and biochemical studies of Brucella melitensis 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase
Biochem.Biophys.Res.Commun. 446 965 970 (2014)
PMID: 24657441 DOI: 10.1016/j.bbrc.2014.03.045

Abstact

The prokaryotic 5'-methylthioadenosine/S-adenosylhomocysteine nucleosidase (MTAN) catalyzes the irreversible cleavage of the glycosidic bond in 5'-methylthioadenosine (MTA) and S-adenosylhomocysteine (SAH), a process that plays a key role in several metabolic pathways. Its absence in all mammalian species has implicated this enzyme as a promising target for antimicrobial drug design. Here, we report the crystal structure of BmMTAN in complex with its product adenine at a resolution of 2.6 Å determined by single-wavelength anomalous dispersion method. 11 key residues were mutated for kinetic characterization. Mutations of Tyr134 and Met144 resulted in the largest overall increase in Km, whereas mutagenesis of residues Glu18, Glu145 and Asp168 completely abolished activity. Glu145 and Asp168 were identified as active site residues essential for catalysis. The catalytic mechanism and implications of this structure for broad-based antibiotic design are discussed.

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