Richard B. Frankel (auth.), Richard B. Frankel, Richard P.'s Iron Biominerals PDF

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HRTEM lattice images (figure 2a) 24 Fig. 2 Lattice images of (a) human spleen ferritin and (b) bacterioferritin from Ps. aeruginosa. Arrows indicate some short range order over 3 to 4 lattice spacings in localized regions of the amorphous particle. Bars = 2 nm. 25 showed that many cores have continuous three-dimensional lattices across the width of the particles. Some crystals also showed amorphous or disordered domains but most particles were crystalline in part. In contrast, limpet and chiton hemolymph ferritins gave two.

With regard to ferritin, one feature of the inner surface appears particularly interesting, viz. the molecular groove that runs at the subunit dimer interface. The curved nature of this region generates a localized charge density which is spatially constrained by the rigidity of the two polypeptides forming the interface (figure 4). Furthermore, although much of the groove is crowded with side chain residues, one region, 29 I= Binding site • = Cation 0 =anion (a) • o • (b) Fig. 5. 30 0 • \ ~ ~ (e) Proposed role for molecular pockets in biomineralization.

R. Soc. Lond. B. 237 335-346 (1989). S. Mann, T. T. Moench and R. J. P Williams, A high resolution electron microscopic investigation of bacterial magnetite; implications for crystal growth. Proc. R. Soc. Lond. B. 221, 385-393 (1984). S. Mann, R. B. Frankel and R. P. Blakemore, Structure, morphology and crystal growth of bacterial magnetite. Nature 310, 405-406 (1984). S. Mann, N. H. C. Sparks and R. P. Blakemore, Structure, morphology and crystal growth of anisotropic magnetite crystals in magnetotactic bacteria.

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