1p3w
From Proteopedia
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| - | [[Image:1p3w.gif|left|200px]] | + | [[Image:1p3w.gif|left|200px]] |
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| - | '''X-ray crystal structure of E. coli IscS''' | + | {{Structure |
| + | |PDB= 1p3w |SIZE=350|CAPTION= <scene name='initialview01'>1p3w</scene>, resolution 2.1Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=PLP:PYRIDOXAL-5'-PHOSPHATE'>PLP</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= ISCS OR B2530 OR C3056 OR Z3797 OR ECS3396 OR SF2577 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | ||
| + | }} | ||
| + | |||
| + | '''X-ray crystal structure of E. coli IscS''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1P3W is a [ | + | 1P3W 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=1P3W OCA]. |
==Reference== | ==Reference== | ||
| - | Crystal structure of IscS, a cysteine desulfurase from Escherichia coli., Cupp-Vickery JR, Urbina H, Vickery LE, J Mol Biol. 2003 Jul 25;330(5):1049-59. PMID:[http:// | + | Crystal structure of IscS, a cysteine desulfurase from Escherichia coli., Cupp-Vickery JR, Urbina H, Vickery LE, J Mol Biol. 2003 Jul 25;330(5):1049-59. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12860127 12860127] |
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: csdb]] | [[Category: csdb]] | ||
[[Category: iron sulfur cluster]] | [[Category: iron sulfur cluster]] | ||
| - | [[Category: | + | [[Category: nif]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:19:29 2008'' |
Revision as of 11:19, 20 March 2008
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| , resolution 2.1Å | |||||||
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| Ligands: | |||||||
| Gene: | ISCS OR B2530 OR C3056 OR Z3797 OR ECS3396 OR SF2577 (Escherichia coli) | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
X-ray crystal structure of E. coli IscS
Overview
IscS is a widely distributed cysteine desulfurase that catalyzes the pyridoxal phosphate-dependent desulfuration of L-cysteine and plays a central role in the delivery of sulfur to a variety of metabolic pathways. We report the crystal structure of Escherichia coli IscS to a resolution of 2.1A. The crystals belong to the space group P2(1)2(1)2(1) and have unit cell dimensions a=73.70A, b=101.97A, c=108.62A (alpha=beta=gamma=90 degrees ). Molecular replacement with the Thermotoga maritima NifS model was used to determine phasing, and the IscS model was refined to an R=20.6% (R(free)=23.6%) with two molecules per asymmetric unit. The structure of E.coli IscS is similar to that of T.maritima NifS with nearly identical secondary structure and an overall backbone r.m.s. difference of 1.4A. However, in contrast to NifS a peptide segment containing the catalytic cysteine residue (Cys328) is partially ordered in the IscS structure. This segment of IscS (residues 323-335) forms a surface loop directed away from the active site pocket. Cys328 is positioned greater than 17A from the pyridoxal phosphate cofactor, suggesting that a large conformational change must occur during catalysis in order for Cys328 to participate in nucleophilic attack of a pyridoxal phosphate-bound cysteine substrate. Modeling suggests that rotation of this loop may allow movement of Cys328 to within approximately 3A of the pyridoxal phosphate cofactor.
About this Structure
1P3W is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structure of IscS, a cysteine desulfurase from Escherichia coli., Cupp-Vickery JR, Urbina H, Vickery LE, J Mol Biol. 2003 Jul 25;330(5):1049-59. PMID:12860127
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