1xtl
From Proteopedia
(New page: 200px<br /><applet load="1xtl" size="450" color="white" frame="true" align="right" spinBox="true" caption="1xtl, resolution 2.00Å" /> '''Crystal structure of...) |
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| - | [[Image:1xtl.gif|left|200px]]<br /><applet load="1xtl" size=" | + | [[Image:1xtl.gif|left|200px]]<br /><applet load="1xtl" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1xtl, resolution 2.00Å" /> | caption="1xtl, resolution 2.00Å" /> | ||
'''Crystal structure of P104H mutant of SOD-like protein from Bacillus subtilis.'''<br /> | '''Crystal structure of P104H mutant of SOD-like protein from Bacillus subtilis.'''<br /> | ||
==Overview== | ==Overview== | ||
| - | It is known that several prokaryotic protein sequences, characterized by | + | It is known that several prokaryotic protein sequences, characterized by high homology with the eukaryotic Cu,ZnSODs, lack some of the metal ligands. In the present work, we have stepwise reintroduced the two missing copper ligands in the SOD-like protein of Bacillus subtilis, through site-directed mutagenesis. The mutant with three out of the four His that bind copper is not active, whereas the fully reconstituted mutant displays an activity of about 10% that of human Cu,ZnSOD. The mutated proteins have been characterized in solution and in the solid state. In solution, the proteins experience conformational disorder, which is believed to be partly responsible for the decreased enzymatic activity and sheds light on the tendency of several human SOD mutants to introduce mobility in the protein frame. In the crystal, on the contrary, the protein has a well-defined conformation, giving rise to dimers through the coordination of an exogenous zinc ion. The catalytic properties of the double mutant, which might be regarded as a step in an artificial evolution from a nonactive SOD to a fully functioning enzyme, are discussed on the basis of the structural and dynamical properties. |
==About this Structure== | ==About this Structure== | ||
| - | 1XTL is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with CU and ZN as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1XTL is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] with <scene name='pdbligand=CU:'>CU</scene> and <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XTL OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Fantoni, A.]] | [[Category: Fantoni, A.]] | ||
[[Category: Mangani, S.]] | [[Category: Mangani, S.]] | ||
| - | [[Category: Viezzoli, M | + | [[Category: Viezzoli, M S.]] |
[[Category: CU]] | [[Category: CU]] | ||
[[Category: ZN]] | [[Category: ZN]] | ||
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[[Category: superoxide dismutase mutants]] | [[Category: superoxide dismutase mutants]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:58:30 2008'' |
Revision as of 13:58, 21 February 2008
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Crystal structure of P104H mutant of SOD-like protein from Bacillus subtilis.
Overview
It is known that several prokaryotic protein sequences, characterized by high homology with the eukaryotic Cu,ZnSODs, lack some of the metal ligands. In the present work, we have stepwise reintroduced the two missing copper ligands in the SOD-like protein of Bacillus subtilis, through site-directed mutagenesis. The mutant with three out of the four His that bind copper is not active, whereas the fully reconstituted mutant displays an activity of about 10% that of human Cu,ZnSOD. The mutated proteins have been characterized in solution and in the solid state. In solution, the proteins experience conformational disorder, which is believed to be partly responsible for the decreased enzymatic activity and sheds light on the tendency of several human SOD mutants to introduce mobility in the protein frame. In the crystal, on the contrary, the protein has a well-defined conformation, giving rise to dimers through the coordination of an exogenous zinc ion. The catalytic properties of the double mutant, which might be regarded as a step in an artificial evolution from a nonactive SOD to a fully functioning enzyme, are discussed on the basis of the structural and dynamical properties.
About this Structure
1XTL is a Single protein structure of sequence from Bacillus subtilis with and as ligands. Full crystallographic information is available from OCA.
Reference
From an inactive prokaryotic SOD homologue to an active protein through site-directed mutagenesis., Banci L, Benvenuti M, Bertini I, Cabelli DE, Calderone V, Fantoni A, Mangani S, Migliardi M, Viezzoli MS, J Am Chem Soc. 2005 Sep 28;127(38):13287-92. PMID:16173759
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