The nature of the di-iron site in the bacterioferritin from Desulfovibrio desulfuricansMacedo, S., Romao, C.V., Mitchell, E., Matias, P.M., Liu, M.Y., Xavier, A.V., LeGall, J., Teixeira, M., Lindley, P., Carrondo, M.A.
(2003) Nat.Struct.Mol.Biol. 10: 285-290
- PubMed: 12627224
- DOI: 10.1038/nsb909
- Primary Citation of Related Structures:
- PubMed Abstract:
- Structure determination of bacterioferritin from Desulfovibrio desulfuricans by the MAD method at the Fe K-edge
Coelho, A.V.,Macedo, S.,Matias, P.M.,Thompson, A.W.,LeGall, J.,Carrondo, M.A.
(2001) Acta Crystallogr.,Sect.D 57: 326
The first crystal structure of a native di-iron center in an iron-storage protein (bacterio)ferritin is reported. The protein, isolated from the anaerobic bacterium Desulfovibrio desulfuricans, has the unique property of having Fe-coproporphyrin III ...
The first crystal structure of a native di-iron center in an iron-storage protein (bacterio)ferritin is reported. The protein, isolated from the anaerobic bacterium Desulfovibrio desulfuricans, has the unique property of having Fe-coproporphyrin III as its heme cofactor. The three-dimensional structure of this bacterioferritin was determined in three distinct catalytic/redox states by X-ray crystallography (at 1.95, 2.05 and 2.35 A resolution), corresponding to different intermediates of the di-iron ferroxidase site. Conformational changes associated with these intermediates support the idea of a route for iron entry into the protein shell through a pore that passes through the di-iron center. Molecular surface and electrostatic potential calculations also suggest the presence of another ion channel, distant from the channels at the three- and four-fold axes proposed as points of entry for the iron atoms.
Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, EAN, Apartado 127, 2781-901 Oeiras, Portugal.