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- W1976755279 abstract "Pediatric cataract of the congenital type is the most common form of childhood blindness and it is clinically and genetically heterogeneous. Mutations in 22 different genes have been identified to be associated with congenital cataracts, and among them, eight mutants belong to αA-crystallin. To explain how mutations in αA-crystallin lead to the development of cataract, quaternary structural parameters, and chaperone function have been investigated in αA-wt and in the following mutants: R12C, R21L, R21W, R49C, R54C, R116C, and R116H. Average molar mass, mass at the RI peak, mass across the peak, hydrodynamic radius (R h), and polydispersity index (PDI) were determined by dynamic light-scattering measurements. The average molar mass and mass across the peak showed major increase in R116C and R116H, moderate increase in R12C, R21W, and R54C, and no increase in R21L and R49C as compared to αA-wt. PDI and R h values were significantly increased only in R116C and R116H. Significant secondary structural changes, as determined by CD measurements, were seen in R21W, R21L, R116C, and R116H, and tertiary structural changes were evident in R21W, R54C, R116C, and R116H. Non-reducing SDS-PAGE has shown the presence of dimers presumably formed by inter-polypeptide disulfide bonds. Chaperone activity, as measured with ADH as the target protein, appeared normal in R49C and R54C, while R12C, R21L, and R21W showed moderate loss and R116C and R116H showed significant loss. Although a specific change in the αA-crystallin behavior that is common to all the mutants was not evident, each mutant showed one or more perturbation as the end effect that leads to cataract." @default.
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- W1976755279 date "2011-11-02" @default.
- W1976755279 modified "2023-09-27" @default.
- W1976755279 title "Quaternary structural parameters of the congenital cataract causing mutants of αA-crystallin" @default.
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- W1976755279 doi "https://doi.org/10.1007/s11010-011-1131-8" @default.
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