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'''Structure of the Wilms Tumor Suppressor Protein Zinc Finger Domain Bound to DNA'''<br /> | '''Structure of the Wilms Tumor Suppressor Protein Zinc Finger Domain Bound to DNA'''<br /> | ||
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==Overview== | ==Overview== | ||
The zinc finger domain of the Wilms tumor suppressor protein (WT1), contains four canonical Cys(2)His(2) zinc fingers. WT1 binds, preferentially to DNA sequences that are closely related to the EGR-1, consensus site. We report the structure determination by both X-ray, crystallography and NMR spectroscopy of the WT1 zinc finger domain in, complex with DNA. The X-ray structure was determined for the complex with, a cognate 14 base-pair oligonucleotide, and composite X-ray/NMR structures, were determined for complexes with both the 14 base-pair and an extended, 17 base-pair DNA. This combined approach allowed unambiguous determination, of the position of the first zinc finger, which is influenced by lattice, contacts in the crystal structure. The crystal structure shows the second, third and fourth zinc finger domains inserted deep into the major groove, of the DNA where they make base-specific interactions. The DNA duplex is, distorted in the vicinity of the first zinc finger, with a cytidine, twisted and tilted out of the base stack to pack against finger 1 and the, tip of finger 2. By contrast, the composite X-ray/NMR structures show that, finger 1 continues to follow the major groove in the solution complexes., However, the orientation of the helix is non-canonical, and the fingertip, and the N terminus of the helix project out of the major groove; as a, consequence, the zinc finger side-chains that are commonly involved in, base recognition make no contact with the DNA. We conclude that finger 1, helps to anchor WT1 to the DNA by amplifying the binding affinity although, it does not contribute significantly to binding specificity. The, structures provide molecular level insights into the potential, consequences of mutations in zinc fingers 2 and 3 that are associated with, Denys-Drash syndrome and nephritic syndrome. The mutations are of two, types, and either destabilize the zinc finger structure or replace key, base contact residues. | The zinc finger domain of the Wilms tumor suppressor protein (WT1), contains four canonical Cys(2)His(2) zinc fingers. WT1 binds, preferentially to DNA sequences that are closely related to the EGR-1, consensus site. We report the structure determination by both X-ray, crystallography and NMR spectroscopy of the WT1 zinc finger domain in, complex with DNA. The X-ray structure was determined for the complex with, a cognate 14 base-pair oligonucleotide, and composite X-ray/NMR structures, were determined for complexes with both the 14 base-pair and an extended, 17 base-pair DNA. This combined approach allowed unambiguous determination, of the position of the first zinc finger, which is influenced by lattice, contacts in the crystal structure. The crystal structure shows the second, third and fourth zinc finger domains inserted deep into the major groove, of the DNA where they make base-specific interactions. The DNA duplex is, distorted in the vicinity of the first zinc finger, with a cytidine, twisted and tilted out of the base stack to pack against finger 1 and the, tip of finger 2. By contrast, the composite X-ray/NMR structures show that, finger 1 continues to follow the major groove in the solution complexes., However, the orientation of the helix is non-canonical, and the fingertip, and the N terminus of the helix project out of the major groove; as a, consequence, the zinc finger side-chains that are commonly involved in, base recognition make no contact with the DNA. We conclude that finger 1, helps to anchor WT1 to the DNA by amplifying the binding affinity although, it does not contribute significantly to binding specificity. The, structures provide molecular level insights into the potential, consequences of mutations in zinc fingers 2 and 3 that are associated with, Denys-Drash syndrome and nephritic syndrome. The mutations are of two, types, and either destabilize the zinc finger structure or replace key, base contact residues. | ||
==About this Structure== | ==About this Structure== | ||
2JPA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | 2JPA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JPA OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: zinc finger]] | [[Category: zinc finger]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jan 23 12:35:57 2008'' | ||
Revision as of 13:35, 23 January 2008
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Structure of the Wilms Tumor Suppressor Protein Zinc Finger Domain Bound to DNA
OverviewOverview
The zinc finger domain of the Wilms tumor suppressor protein (WT1), contains four canonical Cys(2)His(2) zinc fingers. WT1 binds, preferentially to DNA sequences that are closely related to the EGR-1, consensus site. We report the structure determination by both X-ray, crystallography and NMR spectroscopy of the WT1 zinc finger domain in, complex with DNA. The X-ray structure was determined for the complex with, a cognate 14 base-pair oligonucleotide, and composite X-ray/NMR structures, were determined for complexes with both the 14 base-pair and an extended, 17 base-pair DNA. This combined approach allowed unambiguous determination, of the position of the first zinc finger, which is influenced by lattice, contacts in the crystal structure. The crystal structure shows the second, third and fourth zinc finger domains inserted deep into the major groove, of the DNA where they make base-specific interactions. The DNA duplex is, distorted in the vicinity of the first zinc finger, with a cytidine, twisted and tilted out of the base stack to pack against finger 1 and the, tip of finger 2. By contrast, the composite X-ray/NMR structures show that, finger 1 continues to follow the major groove in the solution complexes., However, the orientation of the helix is non-canonical, and the fingertip, and the N terminus of the helix project out of the major groove; as a, consequence, the zinc finger side-chains that are commonly involved in, base recognition make no contact with the DNA. We conclude that finger 1, helps to anchor WT1 to the DNA by amplifying the binding affinity although, it does not contribute significantly to binding specificity. The, structures provide molecular level insights into the potential, consequences of mutations in zinc fingers 2 and 3 that are associated with, Denys-Drash syndrome and nephritic syndrome. The mutations are of two, types, and either destabilize the zinc finger structure or replace key, base contact residues.
About this StructureAbout this Structure
2JPA is a Single protein structure of sequence from Homo sapiens with as ligand. Full crystallographic information is available from OCA.
ReferenceReference
Structure of the wilms tumor suppressor protein zinc finger domain bound to DNA., Stoll R, Lee BM, Debler EW, Laity JH, Wilson IA, Dyson HJ, Wright PE, J Mol Biol. 2007 Oct 5;372(5):1227-45. Epub 2007 Jul 21. PMID:17716689
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