2v0a

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[[Image:2v0a.gif|left|200px]]
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{{Seed}}
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[[Image:2v0a.png|left|200px]]
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{{STRUCTURE_2v0a| PDB=2v0a | SCENE= }}
{{STRUCTURE_2v0a| PDB=2v0a | SCENE= }}
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'''ATOMIC RESOLUTION CRYSTAL STRUCTURE OF HUMAN SUPEROXIDE DISMUTASE'''
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===ATOMIC RESOLUTION CRYSTAL STRUCTURE OF HUMAN SUPEROXIDE DISMUTASE===
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==Overview==
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Mutations of the gene encoding Cu-Zn superoxide dismutase (SOD1) cause 20% of the familial cases of the progressive neurodegenerative disease ALS. A growing body of evidence suggests that in familial ALS (FALS) it is the molecular behavior of the metal-depleted SOD1 dimer that leads to a gain of toxic properties by misfolding, unfolding, and aggregation. Structural studies have so far provided static snapshots on the behavior of the wild-type enzyme and some of the FALS mutants. New approaches are required to map out the structural trajectories of the molecule. Here, using our 1.15-A resolution structure of fully metallated human SOD1 and highly parallelized molecular dynamics code on a high-performance capability computer, we have undertaken molecular dynamics calculations to 4,000 ps to reveal the first stages of misfolding caused by metal deletion. Large spatial and temporal fluctuations of the "electrostatic" and "Zn-binding" loops adjacent to the metal-binding sites are observed in the apo-enzyme relative to the fully metallated dimer. These early misfolding events expose the beta-barrels of the dimer to the external environment, allowing close interactions with adjacent molecules. Protection of the beta-edge of the protein can be partially restored by incorporating a single Zn molecule per dimer. These calculations reveal an essential step in the formation of the experimentally observed self-aggregations of metal-depleted FALS mutant SOD1. This result also has implications for the role of demetallated wild-type SOD1 in sporadic cases of ALS, for which the molecular cause still remains undiscovered.
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(as it appears on PubMed at http://www.pubmed.gov), where 17548825 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17548825}}
==About this Structure==
==About this Structure==
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[[Category: Zinc]]
[[Category: Zinc]]
[[Category: Zn superoxide dismutase]]
[[Category: Zn superoxide dismutase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 17:57:04 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 12:25:30 2008''

Revision as of 09:25, 29 July 2008

Image:2v0a.png

Template:STRUCTURE 2v0a

ATOMIC RESOLUTION CRYSTAL STRUCTURE OF HUMAN SUPEROXIDE DISMUTASE

Template:ABSTRACT PUBMED 17548825

About this Structure

2V0A is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Molecular dynamics using atomic-resolution structure reveal structural fluctuations that may lead to polymerization of human Cu-Zn superoxide dismutase., Strange RW, Yong CW, Smith W, Hasnain SS, Proc Natl Acad Sci U S A. 2007 Jun 12;104(24):10040-4. Epub 2007 Jun 4. PMID:17548825

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