| Structural highlights
Disease
SODC_HUMAN Defects in SOD1 are the cause of amyotrophic lateral sclerosis type 1 (ALS1) [MIM:105400. ALS1 is a familial form of amyotrophic lateral sclerosis, a neurodegenerative disorder affecting upper and lower motor neurons and resulting in fatal paralysis. Sensory abnormalities are absent. Death usually occurs within 2 to 5 years. The etiology of amyotrophic lateral sclerosis is likely to be multifactorial, involving both genetic and environmental factors. The disease is inherited in 5-10% of cases leading to familial forms.[1] [2] [3] [4] [5] [6] [7] [8] [:][9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45]
Function
SODC_HUMAN Destroys radicals which are normally produced within the cells and which are toxic to biological systems.
Publication Abstract from PubMed
Cu,Zn superoxide dismutase (SOD1) is implicated in familial amylotrophic lateral sclerosis through the accumulation of misfolded proteins that are toxic to neuronal cells. Loop VI (residues 102-115) of the protein is at the dimer interface and could play a critical role in stability. The free cysteine residue, Cys111 in the loop, is readily oxidized and alkylated. We have found that modification of this Cys111 with beta-mercaptoethanol (2-ME; 2-ME-SOD1) stabilizes the protein and the mechanism may provide insights into destabilization and the formation of aggregated proteins. Here we determined the crystal structure of 2-ME-SOD1 and find that the 2-ME moieties in both subunits interact asymmetrically at the dimer interface and that there is an asymmetric configuration of segment Gly108 to Cys111 in loop VI. One loop VI of the dimer forms a 310-helix (Gly108 to His110) within a unique beta-bridge stabilized by a hydrogen bond between Ser105-NH and His110-CO, while the other forms a beta-turn without the H-bond. The H-bond (H-type) and H-bond free (F-type) configurations are also seen in some wild-type and mutant human SOD1s in the Protein Data Bank suggesting that they are interconvertible and an intrinsic property of SOD1s. The two structures serve as a basis for classification of these proteins and hopefully a guide to their stability and role in pathophysiology.
Structural switching of Cu,Zn-superoxide dismutases at loop VI: Insights from the crystal structure of beta-mercaptoethanol modified enzyme.,Ihara K, Fujiwara N, Yamaguchi Y, Torigoe H, Wakatsuki S, Taniguchi N, Suzuki K Biosci Rep. 2012 Jul 18. PMID:22804629[46]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
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- ↑ Orrell RW, Marklund SL, deBelleroche JS. Familial ALS is associated with mutations in all exons of SOD1: a novel mutation in exon 3 (Gly72Ser). J Neurol Sci. 1997 Dec 9;153(1):46-9. PMID:9455977
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- ↑ Ihara K, Fujiwara N, Yamaguchi Y, Torigoe H, Wakatsuki S, Taniguchi N, Suzuki K. Structural switching of Cu,Zn-superoxide dismutases at loop VI: Insights from the crystal structure of beta-mercaptoethanol modified enzyme. Biosci Rep. 2012 Jul 18. PMID:22804629 doi:10.1042/BSR20120029
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