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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 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.