Publication Abstract from PubMed
Crystals of E. coli cytochrome b1, alias bacterioferritin, were grown fr om a low ionic strength solution. The resulting monoclniic P21 structure was solved by molecular replacement and refined using noncrystallographi c symmetries applied to the fundamental unit, consisting of two protein subunits and a single haem. From the Patterson self-rotation results it was shown that the asymmetric unit of the monoclinic crystal consists of 12 such dimers and corresponds to a complete, nearly spherical, molecule of bacterioferritin (M4 = 450 kDa) of 432 point-group symmetry. It is thus the most symmetrical cytochrome. As previously determined for the tetragonal form, the haem is located in a special position on a local twofold axis of the dimer. A bimetal centre is also observed within the four-helix bundle of each monomer; a metal-binding site is located on the fourfold axis.
Structure of a monoclinic crystal from of cyctochrome b1 (Bacterioferritin) from E. coli.,Dautant A, Meyer JB, Yariv J, Precigoux G, Sweet RM, Kalb AJ, Frolow F Acta Crystallogr D Biol Crystallogr. 1998 Jan 1;54(Pt 1):16-24. PMID:9867433[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
