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1jgc

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{{STRUCTURE_1jgc| PDB=1jgc | SCENE= }}
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'''The 2.6 A Structure Resolution of Rhodobacter capsulatus Bacterioferritin with Metal-free Dinuclear Site and Heme Iron in a Crystallographic Special Position'''
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===The 2.6 A Structure Resolution of Rhodobacter capsulatus Bacterioferritin with Metal-free Dinuclear Site and Heme Iron in a Crystallographic Special Position===
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==Overview==
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Bacterioferritin from Rhodobacter capsulatus was crystallized and its structure was solved at 2.6 A resolution. This first structure of a bacterioferritin from a photosynthetic organism is a spherical particle of 24 subunits displaying 432 point-group symmetry like ferritin and bacterioferritin from Escherichia coli. Crystallized in the I422 space group, its structural analysis reveals for the first time the non-symmetric heme molecule located on a twofold crystallographic symmetry axis. Other hemes of the protomer are situated on twofold noncrystallographic axes. Apparently, both types of sites bind heme in two orientations, leading to an average structure consisting of a symmetric 50:50 mixture, thus satisfying the crystallographic and noncrystallographic symmetry of the crystal. Five water molecules are situated close to the heme, which is bound in a hydrophobic pocket and axially coordinated by two crystallographic or noncrystallographically related methionine residues. Its ferroxidase center, in which Fe(II) is oxidized to Fe(III), is empty or fractionally occupied by a metal ion. Two positions are observed for the coordinating Glu18 side chain instead of one in the E. coli enzyme in which the site is occupied. This result suggests that the orientation of the Glu18 side chain could be constrained by this interaction.
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(as it appears on PubMed at http://www.pubmed.gov), where 11752777 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11752777}}
==About this Structure==
==About this Structure==
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[[Category: Pon, N G.]]
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Revision as of 17:12, 1 July 2008

Image:1jgc.png

Template:STRUCTURE 1jgc

The 2.6 A Structure Resolution of Rhodobacter capsulatus Bacterioferritin with Metal-free Dinuclear Site and Heme Iron in a Crystallographic Special Position

Template:ABSTRACT PUBMED 11752777

About this Structure

1JGC is a Single protein structure of sequence from Rhodobacter capsulatus. Full crystallographic information is available from OCA.

Reference

The 2.6 A resolution structure of Rhodobacter capsulatus bacterioferritin with metal-free dinuclear site and heme iron in a crystallographic 'special position'., Cobessi D, Huang LS, Ban M, Pon NG, Daldal F, Berry EA, Acta Crystallogr D Biol Crystallogr. 2002 Jan;58(Pt 1):29-38. Epub 2001, Dec 21. PMID:11752777

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