Iron Core Formation in Ferritins

  • Elizabeth C. Theil
  • Dale E. Sayers
Part of the Basic Life Sciences book series (BLSC, volume 51)

Abstract

Iron is the most abundant transition metal in biology. Proteins containing iron are important for DNA synthesis, respiration, photosynthesis, nitrogen fixation and the transport and activation of dioxygen. Two properties of Fe(III) in aqueous solution lead to the formation of large, insoluble aggregates of iron and oxygen: first, the pKa of a proton in water coordinated to Fe(III) is ca 3; second, after proton loss, the conjugate bases form stable oxygen bridges to each other with the elimination of water. Thus unless ligands other than water are coordinated to Fe(III), the solubility of Fe(III) is very low under physiological conditions (ca 10−18 M) (Biedermann and Schindler, 1957). Animals, plants and microorganisms use ferritin, an iron protein complex, to accumulate reserves of iron sufficently high for the synthesis of proteins that have iron at the active center. Ferritin also provides a site for the detoxification of excess iron which enters an organism or cell when the normal barriers to controlled iron uptake are breached.

Keywords

Zinc Migration Filtration Hydroxide Respiration 

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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Elizabeth C. Theil
    • 1
  • Dale E. Sayers
    • 2
  1. 1.Department of BiochemistryNorth Carolina State UniversityRaleighUSA
  2. 2.Department of PhysicsNorth Carolina State UniversityRaleighUSA

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