1k2v
From Proteopedia
(New page: 200px<br /><applet load="1k2v" size="450" color="white" frame="true" align="right" spinBox="true" caption="1k2v, resolution 1.97Å" /> '''E. COLI PERIPLASMIC ...) |
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| - | [[Image:1k2v.jpg|left|200px]]<br /><applet load="1k2v" size=" | + | [[Image:1k2v.jpg|left|200px]]<br /><applet load="1k2v" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1k2v, resolution 1.97Å" /> | caption="1k2v, resolution 1.97Å" /> | ||
'''E. COLI PERIPLASMIC PROTEIN FHUD COMPLEXED WITH DESFERAL'''<br /> | '''E. COLI PERIPLASMIC PROTEIN FHUD COMPLEXED WITH DESFERAL'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Siderophore-binding proteins play an essential role in the uptake of iron | + | Siderophore-binding proteins play an essential role in the uptake of iron in many Gram-positive and Gram-negative bacteria. FhuD is an ATP-binding cassette-type (ABC-type) binding protein involved in the uptake of hydroxamate-type siderophores in Escherichia coli. Structures of FhuD complexed with the antibiotic albomycin, the fungal siderophore coprogen and the drug Desferal have been determined at high resolution by x-ray crystallography. FhuD has an unusual bilobal structure for a periplasmic ligand binding protein, with two mixed beta/alpha domains connected by a long alpha-helix. The binding site for hydroxamate-type ligands is composed of a shallow pocket that lies between these two domains. Recognition of siderophores primarily occurs through interactions between the iron-hydroxamate centers of each siderophore and the side chains of several key residues in the binding pocket. Rearrangements of side chains within the binding pocket accommodate the unique structural features of each siderophore. The backbones of the siderophores are not involved in any direct interactions with the protein, demonstrating how siderophores with considerable chemical and structural diversity can be bound by FhuD. For albomycin, which consists of an antibiotic group attached to a hydroxamate siderophore, electron density for the antibiotic portion was not observed. Therefore, this study provides a basis for the rational design of novel bacteriostatic agents, in the form of siderophore-antibiotic conjugates that can act as "Trojan horses," using the hydroxamate-type siderophore uptake system to actively deliver antibiotics directly into targeted pathogens. |
==About this Structure== | ==About this Structure== | ||
| - | 1K2V is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with DEF as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1K2V is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with <scene name='pdbligand=DEF:'>DEF</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K2V OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Braun, V.]] | [[Category: Braun, V.]] | ||
| - | [[Category: Clarke, T | + | [[Category: Clarke, T E.]] |
| - | [[Category: Tari, L | + | [[Category: Tari, L W.]] |
| - | [[Category: Vogel, H | + | [[Category: Vogel, H J.]] |
[[Category: Winkelmann, G.]] | [[Category: Winkelmann, G.]] | ||
[[Category: DEF]] | [[Category: DEF]] | ||
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[[Category: two domains]] | [[Category: two domains]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:29:29 2008'' |
Revision as of 11:29, 21 February 2008
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E. COLI PERIPLASMIC PROTEIN FHUD COMPLEXED WITH DESFERAL
Overview
Siderophore-binding proteins play an essential role in the uptake of iron in many Gram-positive and Gram-negative bacteria. FhuD is an ATP-binding cassette-type (ABC-type) binding protein involved in the uptake of hydroxamate-type siderophores in Escherichia coli. Structures of FhuD complexed with the antibiotic albomycin, the fungal siderophore coprogen and the drug Desferal have been determined at high resolution by x-ray crystallography. FhuD has an unusual bilobal structure for a periplasmic ligand binding protein, with two mixed beta/alpha domains connected by a long alpha-helix. The binding site for hydroxamate-type ligands is composed of a shallow pocket that lies between these two domains. Recognition of siderophores primarily occurs through interactions between the iron-hydroxamate centers of each siderophore and the side chains of several key residues in the binding pocket. Rearrangements of side chains within the binding pocket accommodate the unique structural features of each siderophore. The backbones of the siderophores are not involved in any direct interactions with the protein, demonstrating how siderophores with considerable chemical and structural diversity can be bound by FhuD. For albomycin, which consists of an antibiotic group attached to a hydroxamate siderophore, electron density for the antibiotic portion was not observed. Therefore, this study provides a basis for the rational design of novel bacteriostatic agents, in the form of siderophore-antibiotic conjugates that can act as "Trojan horses," using the hydroxamate-type siderophore uptake system to actively deliver antibiotics directly into targeted pathogens.
About this Structure
1K2V is a Single protein structure of sequence from Escherichia coli with as ligand. Full crystallographic information is available from OCA.
Reference
X-ray crystallographic structures of the Escherichia coli periplasmic protein FhuD bound to hydroxamate-type siderophores and the antibiotic albomycin., Clarke TE, Braun V, Winkelmann G, Tari LW, Vogel HJ, J Biol Chem. 2002 Apr 19;277(16):13966-72. Epub 2002 Jan 22. PMID:11805094
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