1bzo

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{{STRUCTURE_1bzo| PDB=1bzo | SCENE= }}
{{STRUCTURE_1bzo| PDB=1bzo | SCENE= }}
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'''THREE-DIMENSIONAL STRUCTURE OF PROKARYOTIC CU,ZN SUPEROXIDE DISMUTASE FROM P.LEIOGNATHI, SOLVED BY X-RAY CRYSTALLOGRAPHY.'''
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===THREE-DIMENSIONAL STRUCTURE OF PROKARYOTIC CU,ZN SUPEROXIDE DISMUTASE FROM P.LEIOGNATHI, SOLVED BY X-RAY CRYSTALLOGRAPHY.===
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==Overview==
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Prokaryotic Cu,Zn superoxide dismutases are characterized by a distinct quaternary structure, as compared to that of the homologous eukaryotic enzymes. Here we report a newly determined crystal structure of the dimeric Cu,Zn superoxide dismutase from Photobacterium leiognathi (crystallized in space group R32, refined at 2.5 A resolution, R-factor 0.19) and analyse it in comparison with that of the monomeric enzyme from Escherichia coli. The dimeric assembly, observed also in a previously studied monoclinic crystal form of P. leiognathi Cu,Zn superoxide dismutase, is based on a ring-shaped subunit contact region, defining a solvated interface cavity. Three clusters of neighbouring residues play a direct role in the stabilization of the quaternary assembly. The present analysis, extended to the amino acid sequences of the other 11 known prokaryotic Cu,Zn superoxide dismutases, shows that at least in five other prokaryotic enzymes the interface residue clusters are under strong evolutionary constraint, suggesting the attainment of a quaternary structure coincident with that of P. leiognathi Cu,Zn superoxide dismutase. Calculation of electrostatic fields for both the enzymes from E. coli and P. leiognathi shows that the monomeric/dimeric association behaviour displayed by prokaryotic Cu, Zn superoxide dismutases is related to the distribution of surface charged residues. Moreover, Brownian dynamics simulations reproduce closely the observed enzyme:substrate association rates, highlighting the role of the active site neighbouring residues in determining the dismutase catalytic properties.
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==About this Structure==
==About this Structure==
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[[Category: Protein-subunit recognition]]
[[Category: Protein-subunit recognition]]
[[Category: Zn superoxide dismutase]]
[[Category: Zn superoxide dismutase]]
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Revision as of 17:00, 30 June 2008

Image:1bzo.png

Template:STRUCTURE 1bzo

THREE-DIMENSIONAL STRUCTURE OF PROKARYOTIC CU,ZN SUPEROXIDE DISMUTASE FROM P.LEIOGNATHI, SOLVED BY X-RAY CRYSTALLOGRAPHY.

Template:ABSTRACT PUBMED 9878406

About this Structure

1BZO is a Single protein structure of sequence from Photobacterium leiognathi. Full crystallographic information is available from OCA.

Reference

Evolutionary constraints for dimer formation in prokaryotic Cu,Zn superoxide dismutase., Bordo D, Matak D, Djinovic-Carugo K, Rosano C, Pesce A, Bolognesi M, Stroppolo ME, Falconi M, Battistoni A, Desideri A, J Mol Biol. 1999 Jan 8;285(1):283-96. PMID:9878406

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