Structure of a unique twofold symmetric haem-binding site.Frolow, F., Kalb, A.J., Yariv, J.
(1994) Nat.Struct.Mol.Biol. 1: 453-460
- PubMed: 7664064
- PubMed Abstract:
- Amino Acid Sequence of the Bacterioferritin (Cytochrome B1) of Escherichia Coli-K12
Andrews, S.C.,Smith, J.M.A.,Guest, J.R.,Harrison, P.M.
(1989) Biochem.Biophys.Res.Commun. 158: 489
- The Identity of Bacterioferritin and Cytochrome B1
(1983) Biochem.J. 211: 527
- The Composition and the Structure of Bacterioferritin of Escherichia Coli
Yariv, J.,Kalb(Gilboa), A.J.,Sperling, R.,Bauminger, E.R.,Cohen, S.G.,Ofer, S.
(1981) Biochem.J. 197: 171
- Location of Haem in Bacterioferritin of Escherichia Coli
Frolow, F.,Kalb(Gilboa), A.J.,Yariv, J.
(1993) Acta Crystallogr.,Sect.D 49: 597
- Molecular Size and Symmetry of the Bacterioferritin of Escherichia Coli: X-Ray Crystallographic Characterization of Four Crystal Forms
Smith, J.M.A.,Ford, G.C.,Harrison, P.M.,Yariv, J.,Kalb(Gilboa), A.J.
(1989) J.Mol.Biol. 205: 465
Bacterioferritin of Escherichia coli, also known as cytochrome b1, is a hollow, nearly spherical shell made up of 24 identical protein subunits and 12 haems. We have solved this structure in a tetragonal crystal form at 2.9 A resolution. We find that ...
Bacterioferritin of Escherichia coli, also known as cytochrome b1, is a hollow, nearly spherical shell made up of 24 identical protein subunits and 12 haems. We have solved this structure in a tetragonal crystal form at 2.9 A resolution. We find that each haem is bound in a pocket formed by the interface between a pair of symmetry-related subunits. The quasi-twofold axis of the haem is closely aligned with the local twofold axis relating these subunits. The axial ligands of the haem are sulphurs of two equivalent methionyl residues (Met 52) from the symmetry-related subunits. A cluster of four water molecules is trapped in the gap between the upper edge of the haem and two extended protein loops which close off the haem from the outer aqueous environment. This is the first structure of a bis-methionine ligated haem-binding site and the first case of a twofold symmetric haem-binding site.
Department of Chemical Services, Weizmann Institute of Science, Rehovot, Israel.