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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 (4-5 ): 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 (4-5 ): 615-22 PMID24504941 show ga
  • Integrated ferritin protein cage function is the reversible synthesis of protein-caged, solid Fe2O3·H2O minerals from Fe(2+) for metabolic iron concentrates and oxidant protection; biomineral order differs in different ferritin proteins. The conserved 432 geometric symmetry of ferritin protein cages parallels the 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 Fe(2+) transport though ion channels (threefold symmetry), biomineral nucleation/order (fourfold symmetry), and mineral dissolution (threefold symmetry) studied in ferritin variants. On the basis of the effects of natural or synthetic subunit dimer cross-links, cage subunit dimers (twofold symmetry) influence iron oxidation and mineral dissolution. 2Fe(2+)/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 three subunits. Here, we study 2Fe(2+) + 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 twofold and threefold cage axes to show function at ferritin fourfold cage axes. Here, conserved amino acids facilitate dissolution of ferritin-protein-caged iron biominerals. Biological and nanotechnological uses of ferritin protein cage fourfold symmetry and solid-state mineral properties remain largely unexplored.
  • |Catalysis [MESH]
  • |Ferric Compounds/chemistry/metabolism [MESH]
  • |Ferritins/*chemistry/*metabolism [MESH]
  • |Iron/chemistry/metabolism [MESH]


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