1i9d

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[[Image:1i9d.jpg|left|200px]]<br /><applet load="1i9d" size="350" color="white" frame="true" align="right" spinBox="true"
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[[Image:1i9d.jpg|left|200px]]
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caption="1i9d, resolution 1.65&Aring;" />
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'''ARSENATE REDUCTASE FROM E. COLI'''<br />
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{{Structure
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|PDB= 1i9d |SIZE=350|CAPTION= <scene name='initialview01'>1i9d</scene>, resolution 1.65&Aring;
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|SITE=
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|LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=SO3:SULFITE+ION'>SO3</scene> and <scene name='pdbligand=CS:CESIUM ION'>CS</scene>
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|ACTIVITY=
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|GENE=
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}}
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'''ARSENATE REDUCTASE FROM E. COLI'''
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==Overview==
==Overview==
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==About this Structure==
==About this Structure==
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1I9D 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=SO4:'>SO4</scene>, <scene name='pdbligand=SO3:'>SO3</scene> and <scene name='pdbligand=CS:'>CS</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1I9D OCA].
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1I9D is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1I9D OCA].
==Reference==
==Reference==
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Insights into the structure, solvation, and mechanism of ArsC arsenate reductase, a novel arsenic detoxification enzyme., Martin P, DeMel S, Shi J, Gladysheva T, Gatti DL, Rosen BP, Edwards BF, Structure. 2001 Nov;9(11):1071-81. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11709171 11709171]
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Insights into the structure, solvation, and mechanism of ArsC arsenate reductase, a novel arsenic detoxification enzyme., Martin P, DeMel S, Shi J, Gladysheva T, Gatti DL, Rosen BP, Edwards BF, Structure. 2001 Nov;9(11):1071-81. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11709171 11709171]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: reductase]]
[[Category: reductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:09:26 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 11:47:19 2008''

Revision as of 09:47, 20 March 2008

Image:1i9d.jpg


PDB ID 1i9d

Drag the structure with the mouse to rotate
, resolution 1.65Å
Ligands: , and
Coordinates: save as pdb, mmCIF, xml



ARSENATE REDUCTASE FROM E. COLI


Overview

BACKGROUND: In Escherichia coli bearing the plasmid R773, resistance to arsenite, arsenate, antimonite, and tellurite is conferred by the arsRDABC plasmid operon that codes for an ATP-dependent anion pump. The product of the arsC gene, arsenate reductase (ArsC), is required to efficiently catalyze the reduction of arsenate to arsenite prior to extrusion. RESULTS: Here, we report the first X-ray crystal structures of ArsC at 1.65 A and of ArsC complexed with arsenate and arsenite at 1.26 A resolution. The overall fold is unique. The native structure shows sulfate and sulfite ions binding in the active site as analogs of arsenate and arsenite. The covalent adduct of arsenate with Cys-12 in the active site of ArsC, which was analyzed in a difference map, shows tetrahedral geometry with a sulfur-arsenic distance of 2.18 A. However, the corresponding adduct with arsenite binds as a hitherto unseen thiarsahydroxy adduct. Finally, the number of bound waters (385) in this highly ordered crystal structure approaches twice the number expected at this resolution for a structure of 138 ordered residues. CONCLUSIONS: Structural information from the adduct of ArsC with its substrate (arsenate) and with its product (arsenite) together with functional information from mutational and biochemical studies on ArsC suggest a plausible mechanism for the reaction. The exceptionally well-defined water structure indicates that this crystal system has precise long-range order within the crystal and that the upper limit for the number of bound waters in crystal structures is underestimated by the structures in the Protein Data Bank.

About this Structure

1I9D is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Insights into the structure, solvation, and mechanism of ArsC arsenate reductase, a novel arsenic detoxification enzyme., Martin P, DeMel S, Shi J, Gladysheva T, Gatti DL, Rosen BP, Edwards BF, Structure. 2001 Nov;9(11):1071-81. PMID:11709171

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