| 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
Mutations in the gene encoding Cu-Zn superoxide dismutase 1 (SOD1) cause a subset of familial amyotrophic lateral sclerosis (fALS) cases. A shared effect of these mutations is that SOD1, which is normally a stable dimer, dissociates into toxic monomers that seed toxic aggregates. Considerable research effort has been devoted to developing compounds that stabilize the dimer of fALS SOD1 variants, but unfortunately, this has not yet resulted in a treatment. We hypothesized that cyclic thiosulfinate cross-linkers, which selectively target a rare, 2 cysteine-containing motif, can stabilize fALS-causing SOD1 variants in vivo. We created a library of chemically diverse cyclic thiosulfinates and determined structure-cross-linking-activity relationships. A pre-lead compound, "S-XL6," was selected based upon its cross-linking rate and drug-like properties. Co-crystallographic structure clearly establishes the binding of S-XL6 at Cys 111 bridging the monomers and stabilizing the SOD1 dimer. Biophysical studies reveal that the degree of stabilization afforded by S-XL6 (up to 24 degrees C) is unprecedented for fALS, and to our knowledge, for any protein target of any kinetic stabilizer. Gene silencing and protein degrading therapeutic approaches require careful dose titration to balance the benefit of diminished fALS SOD1 expression with the toxic loss-of-enzymatic function. We show that S-XL6 does not share this liability because it rescues the activity of fALS SOD1 variants. No pharmacological agent has been proven to bind to SOD1 in vivo. Here, using a fALS mouse model, we demonstrate oral bioavailability; rapid engagement of SOD1G93A by S-XL6 that increases SOD1G93A's in vivo half-life; and that S-XL6 crosses the blood-brain barrier. S-XL6 demonstrated a degree of selectivity by avoiding off-target binding to plasma proteins. Taken together, our results indicate that cyclic thiosulfinate-mediated SOD1 stabilization should receive further attention as a potential therapeutic approach for fALS.
Evaluating protein cross-linking as a therapeutic strategy to stabilize SOD1 variants in a mouse model of familial ALS.,Hossain MA, Sarin R, Donnelly DP, Miller BC, Weiss A, McAlary L, Antonyuk SV, Salisbury JP, Amin J, Conway JB, Watson SS, Winters JN, Xu Y, Alam N, Brahme RR, Shahbazian H, Sivasankar D, Padmakumar S, Sattarova A, Ponmudiyan AC, Gawde T, Verrill DE, Yang W, Kannapadi S, Plant LD, Auclair JR, Makowski L, Petsko GA, Ringe D, Agar NYR, Greenblatt DJ, Ondrechen MJ, Chen Y, Yerbury JJ, Manetsch R, Hasnain SS, Brown RH Jr, Agar JN PLoS Biol. 2024 Jan 30;22(1):e3002462. doi: 10.1371/journal.pbio.3002462. , eCollection 2024 Jan. PMID:38289969[46]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
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- ↑ Hossain MA, Sarin R, Donnelly DP, Miller BC, Weiss A, McAlary L, Antonyuk SV, Salisbury JP, Amin J, Conway JB, Watson SS, Winters JN, Xu Y, Alam N, Brahme RR, Shahbazian H, Sivasankar D, Padmakumar S, Sattarova A, Ponmudiyan AC, Gawde T, Verrill DE, Yang W, Kannapadi S, Plant LD, Auclair JR, Makowski L, Petsko GA, Ringe D, Agar NYR, Greenblatt DJ, Ondrechen MJ, Chen Y, Yerbury JJ, Manetsch R, Hasnain SS, Brown RH Jr, Agar JN. Evaluating protein cross-linking as a therapeutic strategy to stabilize SOD1 variants in a mouse model of familial ALS. PLoS Biol. 2024 Jan 30;22(1):e3002462. PMID:38289969 doi:10.1371/journal.pbio.3002462
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