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2v8p

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{{STRUCTURE_2v8p| PDB=2v8p | SCENE= }}
{{STRUCTURE_2v8p| PDB=2v8p | SCENE= }}
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'''ISPE IN COMPLEX WITH ADP AND CDP'''
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===ISPE IN COMPLEX WITH ADP AND CDP===
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==Overview==
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4-Diphosphocytidyl-2C-methyl-d-erythritol kinase (IspE) catalyses the ATP-dependent conversion of 4-diphosphocytidyl-2C-methyl-d-erythritol (CDPME) to 4-diphosphocytidyl-2C-methyl-d-erythritol 2-phosphate with the release of ADP. This reaction occurs in the non-mevalonate pathway of isoprenoid precursor biosynthesis and because it is essential in important microbial pathogens and absent from mammals it represents a potential target for anti-infective drugs. We set out to characterize the biochemical properties, determinants of molecular recognition and reactivity of IspE and report the cloning and purification of recombinant Aquifex aeolicus IspE (AaIspE), kinetic data, metal ion, temperature and pH dependence, crystallization and structure determination of the enzyme in complex with CDP, CDPME and ADP. In addition, 4-fluoro-3,5-dihydroxy-4-methylpent-1-enylphosphonic acid (compound 1) was designed to mimic a fragment of the substrate, a synthetic route to 1 was elucidated and the complex structure determined. Surprisingly, this ligand occupies the binding site for the ATP alpha-phosphate not the binding site for the methyl-d-erythritol moiety of CDPME. Gel filtration and analytical ultracentrifugation indicate that AaIspE is a monomer in solution. The enzyme displays the characteristic alpha/beta galacto-homoserine-mevalonate-phosphomevalonate kinase fold, with the catalytic centre positioned in a deep cleft between the ATP- and CDPME-binding domains. Comparisons indicate a high degree of sequence conservation on the IspE active site across bacterial species, similarities in structure, specificity of substrate recognition and mechanism. The biochemical characterization, attainment of well-ordered and reproducible crystals and the models resulting from the analyses provide reagents and templates to support the structure-based design of broad-spectrum antimicrobial agents.
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{{ABSTRACT_PUBMED_18422643}}
==About this Structure==
==About this Structure==
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[[Category: Nucleotide-binding]]
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[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 18:20:43 2008''

Revision as of 15:20, 27 July 2008

Image:2v8p.png

Template:STRUCTURE 2v8p

ISPE IN COMPLEX WITH ADP AND CDP

Template:ABSTRACT PUBMED 18422643

About this Structure

2V8P is a Single protein structure of sequence from Aquifex aeolicus. This structure supersedes the now removed PDB entry 2v2y. Full crystallographic information is available from OCA.

Reference

Characterization of Aquifex aeolicus 4-diphosphocytidyl-2C-methyl-d-erythritol kinase - ligand recognition in a template for antimicrobial drug discovery., Sgraja T, Alphey MS, Ghilagaber S, Marquez R, Robertson MN, Hemmings JL, Lauw S, Rohdich F, Bacher A, Eisenreich W, Illarionova V, Hunter WN, FEBS J. 2008 Apr 16;. PMID:18422643

Page seeded by OCA on Sun Jul 27 18:20:43 2008

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