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2uzh

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{{STRUCTURE_2uzh| PDB=2uzh | SCENE= }}
{{STRUCTURE_2uzh| PDB=2uzh | SCENE= }}
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'''MYCOBACTERIUM SMEGMATIS 2C-METHYL-D-ERYTHRITOL-2,4-CYCLODIPHOSPHATE SYNTHASE (ISPF)'''
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===MYCOBACTERIUM SMEGMATIS 2C-METHYL-D-ERYTHRITOL-2,4-CYCLODIPHOSPHATE SYNTHASE (ISPF)===
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==Overview==
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BACKGROUND: The prevalence of tuberculosis, the prolonged and expensive treatment that this disease requires and an increase in drug resistance indicate an urgent need for new treatments. The 1-deoxy-D-xylulose 5-phosphate pathway of isoprenoid precursor biosynthesis is an attractive chemotherapeutic target because it occurs in many pathogens, including Mycobacterium tuberculosis, and is absent from humans. To underpin future drug development it is important to assess which enzymes in this biosynthetic pathway are essential in the actual pathogens and to characterize them. RESULTS: The fifth enzyme of this pathway, encoded by ispF, is 2C-methyl-D-erythritol-2,4-cyclodiphosphate synthase (IspF). A two-step recombination strategy was used to construct ispF deletion mutants in M. tuberculosis but only wild-type double crossover strains were isolated. The chromosomal copy could be deleted when a second functional copy was provided on an integrating plasmid, demonstrating that ispF is an essential gene under the conditions tested thereby confirming its potential as a drug target. We attempted structure determination of the M. tuberculosis enzyme (MtIspF), but failed to obtain crystals. We instead analyzed the orthologue M. smegmatis IspF (MsIspF), sharing 73% amino acid sequence identity, at 2.2 A resolution. The high level of sequence conservation is particularly pronounced in and around the active site. MsIspF is a trimer with a hydrophobic cavity at its center that contains density consistent with diphosphate-containing isoprenoids. The active site, created by two subunits, comprises a rigid CDP-Zn2+ binding pocket with a flexible loop to position the 2C-methyl-D-erythritol moiety of substrate. Sequence-structure comparisons indicate that the active site and interactions with ligands are highly conserved. CONCLUSION: Our study genetically validates MtIspF as a therapeutic target and provides a model system for structure-based ligand design.
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==About this Structure==
==About this Structure==
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[[Category: Mycobacteria]]
[[Category: Mycobacteria]]
[[Category: Non-mevalonate pathway of isoprenoid biosynthesis]]
[[Category: Non-mevalonate pathway of isoprenoid biosynthesis]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 17:52:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 12:01:23 2008''

Revision as of 09:01, 28 July 2008

Image:2uzh.png

Template:STRUCTURE 2uzh

MYCOBACTERIUM SMEGMATIS 2C-METHYL-D-ERYTHRITOL-2,4-CYCLODIPHOSPHATE SYNTHASE (ISPF)

Template:ABSTRACT PUBMED 17956607

About this Structure

2UZH is a Single protein structure of sequence from Mycobacterium smegmatis. Full crystallographic information is available from OCA.

Reference

The structure of Mycobacteria 2C-methyl-D-erythritol-2,4-cyclodiphosphate synthase, an essential enzyme, provides a platform for drug discovery., Buetow L, Brown AC, Parish T, Hunter WN, BMC Struct Biol. 2007 Oct 23;7:68. PMID:17956607

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