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10.1007/s00775-014-1103-z

http://scihub22266oqcxt.onion/10.1007/s00775-014-1103-z
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suck abstract from ncbi


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pmid24504941      J+Biol+Inorg+Chem 2014 ; 19 (ä): 615-22
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  • Coordinating Subdomains of Ferritin Protein Cages with Catalysis and Biomineralization viewed from the C4 Cage Axes #MMPMID24504941
  • Theil EC; Turano P; Ghini V; Allegrozzi M; Bernacchioni C
  • J Biol Inorg Chem 2014[Jun]; 19 (ä): 615-22 PMID24504941show ga
  • Integrated ferritin protein cage function is the reversible synthesis of protein-caged, solid Fe2O3?H2O minerals from Fe2+, for metabolic iron concentrates and oxidant protection; biomineral order varies in different ferritin proteins. The conserved 4, 3, 2 geometric symmetry of ferritin protein cages, parallels subunit dimer, trimer and tetramer interfaces, and coincides with function at several cage axes. Multiple subdomains distributed in the self- assembling ferritin nanocages have functional relationships to cage symmetry such as Fe2+ transport though ion channels (3-fold symmetry), biomineral nucleation/order (4-fold symmetry) and mineral dissolution (3-fold symmetry) studied in ferritin variants. Cage subunit dimers (2-fold symmetry) influence iron oxidation and mineral dissolution, based on effects of natural or synthetic subunit dimer crosslinks. 2Fe2+/O2 catalysis in ferritin occurs in single subunits, but with cooperativity (n=3) that is possibly related to the structure/function of the ion channels, which are constructed from segments of 3 subunits. Here, we study 2Fe2+ + O2 protein catalysis (diferric peroxo formation) and dissolution of ferritin Fe2O3?H2O biominerals in variants with altered subunit interfaces for trimers (ion channels), E130I, and external dimer surfaces (E88A) as controls, and altered tetramer subunit interfaces (L165I and H169F). The results extend observations on the functional importance of structure at ferritin protein 2-fold and 3-fold cage axes to show function at ferritin 4-fold cage axes. Here, conserved amino acids facilitate dissolution of ferritin protein-caged iron biominerals. Biological and nanotechnological uses of ferritin protein cage 4-fold symmetry and solid state mineral properties remain largely unexplored.
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