Crystal Structures of Ferritin Grown by the Microbatch Method in the Presence of Agarose and Electric Field Shows Enhanced Metal Binding
Stojanoff, V.; Seetharaman, A.; Ramesh Babu, P.; Ismail, M.; Miller, D.
Show abstract
Ferritin is an ubiquitous iron storage protein found in all kingdoms of life. Ferritin is essential for iron homeostasis and is involved in a wide range of physiological and pathological processes. Several structures of ferritin in complex with small molecules and metal ions have been reported. Here we report the crystal structures of Horse Spleen Ferritin, in which the crystals were grown by employing a novel approach adopting the microbatch experiments performed in the presence and absence of electric field using a 2% agarose pellet of CdSO4. We observed that 1) these structures contain increased number of Cd ions as compared to the crystallization of same protein by others using different methods. 2) The externally applied electric field reduced the number of nucleation and with fewer nucleation the size of the crystals increased. 3) There is no significant conformational change observed among these structures. 4) Irrespective of the externally applied electric field, this agarose microbatch crystallization method facilitates the retaining of increased number of bound metal ions with ferritin to mimic the possible in vivo environment.
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