1naw
From Proteopedia
(New page: 200px<br /><applet load="1naw" size="450" color="white" frame="true" align="right" spinBox="true" caption="1naw, resolution 2.0Å" /> '''ENOLPYRUVYL TRANSFERA...) |
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| - | [[Image:1naw.gif|left|200px]]<br /><applet load="1naw" size=" | + | [[Image:1naw.gif|left|200px]]<br /><applet load="1naw" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1naw, resolution 2.0Å" /> | caption="1naw, resolution 2.0Å" /> | ||
'''ENOLPYRUVYL TRANSFERASE'''<br /> | '''ENOLPYRUVYL TRANSFERASE'''<br /> | ||
==Overview== | ==Overview== | ||
| - | BACKGROUND. The ever increasing number of antibiotic resistant bacteria | + | BACKGROUND. The ever increasing number of antibiotic resistant bacteria has fuelled interest in the development of new antibiotics and other antibacterial agents. The major structural element of the bacterial cell wall is the heteropolymer peptidoglycan and the enzymes of peptidoglycan biosynthesis are potential targets for antibacterial agents. One such enzyme is UDP-N-acetylglucosamine enolpyruvyltransferase (EPT) which catalyzes the first committed step in peptidoglycan biosynthesis: the transfer of the enolpyruvyl moiety of phosphoenolpyruvate (PEP) to the 3-hydroxyl of UDP-N-acetylglucosamine (UDPGlcNAc). EPT is of potential pharmaceutical interest because it is inhibited by the broad spectrum antibiotic fosfomycin. RESULTS. The crystal structure of substrate-free EPT has been determined at 2.0 A resolution. The structure reveals a two-domain protein with an unusual fold (inside out alpha/beta barrel) which is built up from the sixfold repetition of one folding unit. The only repetitive element in the amino acid sequence is a short motif, Leu-X3-Gly(Ala), which is responsible for the formation of hydrogen-bond interactions between the folding units. An enzyme which catalyzes a similar reaction to EPT, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), has a very similar structure despite an amino acid sequence identity of only 25%. To date, only these two enzymes appear to display this characteristic fold. CONCLUSIONS. The present structure reflects the open conformation of the enzyme which is probably stabilized through two residues, a lysine and an arginine, located in the cleft between the domains. Binding of the negatively charged UDPGlcNAc to these residues could neutralize the repulsive force between the two domains, thereby allowing the movement of a catalytically active cysteine residue towards the cleft. |
==About this Structure== | ==About this Structure== | ||
| - | 1NAW is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Enterobacter_cloacae Enterobacter cloacae] with HAI as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/UDP-N-acetylglucosamine_1-carboxyvinyltransferase UDP-N-acetylglucosamine 1-carboxyvinyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.7 2.5.1.7] Full crystallographic information is available from [http:// | + | 1NAW is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Enterobacter_cloacae Enterobacter cloacae] with <scene name='pdbligand=HAI:'>HAI</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/UDP-N-acetylglucosamine_1-carboxyvinyltransferase UDP-N-acetylglucosamine 1-carboxyvinyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.7 2.5.1.7] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NAW OCA]. |
==Reference== | ==Reference== | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:04:05 2008'' |
Revision as of 12:04, 21 February 2008
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ENOLPYRUVYL TRANSFERASE
Overview
BACKGROUND. The ever increasing number of antibiotic resistant bacteria has fuelled interest in the development of new antibiotics and other antibacterial agents. The major structural element of the bacterial cell wall is the heteropolymer peptidoglycan and the enzymes of peptidoglycan biosynthesis are potential targets for antibacterial agents. One such enzyme is UDP-N-acetylglucosamine enolpyruvyltransferase (EPT) which catalyzes the first committed step in peptidoglycan biosynthesis: the transfer of the enolpyruvyl moiety of phosphoenolpyruvate (PEP) to the 3-hydroxyl of UDP-N-acetylglucosamine (UDPGlcNAc). EPT is of potential pharmaceutical interest because it is inhibited by the broad spectrum antibiotic fosfomycin. RESULTS. The crystal structure of substrate-free EPT has been determined at 2.0 A resolution. The structure reveals a two-domain protein with an unusual fold (inside out alpha/beta barrel) which is built up from the sixfold repetition of one folding unit. The only repetitive element in the amino acid sequence is a short motif, Leu-X3-Gly(Ala), which is responsible for the formation of hydrogen-bond interactions between the folding units. An enzyme which catalyzes a similar reaction to EPT, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), has a very similar structure despite an amino acid sequence identity of only 25%. To date, only these two enzymes appear to display this characteristic fold. CONCLUSIONS. The present structure reflects the open conformation of the enzyme which is probably stabilized through two residues, a lysine and an arginine, located in the cleft between the domains. Binding of the negatively charged UDPGlcNAc to these residues could neutralize the repulsive force between the two domains, thereby allowing the movement of a catalytically active cysteine residue towards the cleft.
About this Structure
1NAW is a Single protein structure of sequence from Enterobacter cloacae with as ligand. Active as UDP-N-acetylglucosamine 1-carboxyvinyltransferase, with EC number 2.5.1.7 Full crystallographic information is available from OCA.
Reference
Crystal structure of UDP-N-acetylglucosamine enolpyruvyltransferase, the target of the antibiotic fosfomycin., Schonbrunn E, Sack S, Eschenburg S, Perrakis A, Krekel F, Amrhein N, Mandelkow E, Structure. 1996 Sep 15;4(9):1065-75. PMID:8805592
Page seeded by OCA on Thu Feb 21 14:04:05 2008
Categories: Enterobacter cloacae | Single protein | UDP-N-acetylglucosamine 1-carboxyvinyltransferase | Amrhein, N. | Eschenburg, S. | Krekel, F. | Mandelkow, E. | Perrakis, A. | Sack, S. | Schoenbrunn, E. | HAI | Domain movement | Folding | Hinge | Peptidoglycan biosynthesis | Sequence motif | Transferase
