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[[Image:1h0o.gif|left|200px]]


{{Structure
==Cobalt substitution of mouse R2 ribonucleotide reductase to model the reactive diferrous state==
|PDB= 1h0o |SIZE=350|CAPTION= <scene name='initialview01'>1h0o</scene>, resolution 2.2&Aring;
<StructureSection load='1h0o' size='340' side='right'caption='[[1h0o]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
|SITE= <scene name='pdbsite=CO1:Co+Binding+Site+For+Chain+A'>CO1</scene>
== Structural highlights ==
|LIGAND= <scene name='pdbligand=CO:COBALT (II) ION'>CO</scene>
<table><tr><td colspan='2'>[[1h0o]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H0O OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1H0O FirstGlance]. <br>
|ACTIVITY= [http://en.wikipedia.org/wiki/Ribonucleoside-diphosphate_reductase Ribonucleoside-diphosphate reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.17.4.1 1.17.4.1]  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene></td></tr>
}}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1h0o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h0o OCA], [https://pdbe.org/1h0o PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1h0o RCSB], [https://www.ebi.ac.uk/pdbsum/1h0o PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1h0o ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RIR2_MOUSE RIR2_MOUSE] Provides the precursors necessary for DNA synthesis. Catalyzes the biosynthesis of deoxyribonucleotides from the corresponding ribonucleotides. Inhibits Wnt signaling (By similarity).
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/h0/1h0o_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1h0o ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The R2 dimer of mouse ribonucleotide reductase contains a dinuclear iron-oxygen cluster and tyrosyl radical/subunit. The dinuclear diferrous form reacts with dioxygen to generate the tyrosyl radical essential for the catalytic reaction that occurs at the R1 dimer. It is important to understand how the reactivity toward oxygen is related to the crystal structure of the dinuclear cluster. For the mouse R2 protein, no structure has been available with a fully occupied dinuclear metal ion site. A cobalt substitution of mouse R2 was performed to produce a good model for the very air-sensitive diferrous form of the enzyme. X-band EPR and light absorption studies (epsilon(550 nm) = 100 mm(-1) cm(-1)/Co(II)) revealed a strong cooperative binding of cobalt to the dinuclear site. In perpendicular mode EPR, the axial signal from mouse R2 incubated with Co(II) showed a typical S = 3/2 Co(II) signal, and its low intensity indicated that the majority of the Co(II) bound to R2 is magnetically coupled. In parallel mode EPR, a typical integer spin signal (M(s) = +/-3) with g approximately 12 is observed at 3.6 K and 10 K, showing that the two Co(II) ions (S = 3/2) in the dinuclear site are ferromagnetically coupled. We have solved the 2.4 A crystal structure of the Co(II)-substituted R2 with a fully occupied dinuclear cluster. The bridging Co(II) carboxylate ligand Glu-267 adopts an altered orientation compared with its counterpart Glu-238 in Escherichia coli R2. This might be important for proper O(2) activation of the more exposed native diferrous site in mouse R2 compared with E. coli R2.


'''COBALT SUBSTITUTION OF MOUSE R2 RIBONUCLEOTIDE REDUCTASE TO MODEL THE REACTIVE DIFERROUS STATE'''
Cobalt substitution of mouse R2 ribonucleotide reductase as a model for the reactive diferrous state Spectroscopic and structural evidence for a ferromagnetically coupled dinuclear cobalt cluster.,Strand KR, Karlsen S, Andersson KK J Biol Chem. 2002 Sep 13;277(37):34229-38. Epub 2002 Jun 26. PMID:12087093<ref>PMID:12087093</ref>


From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1h0o" style="background-color:#fffaf0;"></div>


==Overview==
==See Also==
The R2 dimer of mouse ribonucleotide reductase contains a dinuclear iron-oxygen cluster and tyrosyl radical/subunit. The dinuclear diferrous form reacts with dioxygen to generate the tyrosyl radical essential for the catalytic reaction that occurs at the R1 dimer. It is important to understand how the reactivity toward oxygen is related to the crystal structure of the dinuclear cluster. For the mouse R2 protein, no structure has been available with a fully occupied dinuclear metal ion site. A cobalt substitution of mouse R2 was performed to produce a good model for the very air-sensitive diferrous form of the enzyme. X-band EPR and light absorption studies (epsilon(550 nm) = 100 mm(-1) cm(-1)/Co(II)) revealed a strong cooperative binding of cobalt to the dinuclear site. In perpendicular mode EPR, the axial signal from mouse R2 incubated with Co(II) showed a typical S = 3/2 Co(II) signal, and its low intensity indicated that the majority of the Co(II) bound to R2 is magnetically coupled. In parallel mode EPR, a typical integer spin signal (M(s) = +/-3) with g approximately 12 is observed at 3.6 K and 10 K, showing that the two Co(II) ions (S = 3/2) in the dinuclear site are ferromagnetically coupled. We have solved the 2.4 A crystal structure of the Co(II)-substituted R2 with a fully occupied dinuclear cluster. The bridging Co(II) carboxylate ligand Glu-267 adopts an altered orientation compared with its counterpart Glu-238 in Escherichia coli R2. This might be important for proper O(2) activation of the more exposed native diferrous site in mouse R2 compared with E. coli R2.
*[[Ribonucleotide reductase 3D structures|Ribonucleotide reductase 3D structures]]
 
== References ==
==About this Structure==
<references/>
1H0O is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H0O OCA].
__TOC__
 
</StructureSection>
==Reference==
[[Category: Large Structures]]
Cobalt substitution of mouse R2 ribonucleotide reductase as a model for the reactive diferrous state Spectroscopic and structural evidence for a ferromagnetically coupled dinuclear cobalt cluster., Strand KR, Karlsen S, Andersson KK, J Biol Chem. 2002 Sep 13;277(37):34229-38. Epub 2002 Jun 26. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12087093 12087093]
[[Category: Mus musculus]]
[[Category: Mus musculus]]
[[Category: Ribonucleoside-diphosphate reductase]]
[[Category: Andersson KK]]
[[Category: Single protein]]
[[Category: Karlsen S]]
[[Category: Andersson, K K.]]
[[Category: Strand KR]]
[[Category: Karlsen, S.]]
[[Category: Strand, K R.]]
[[Category: CO]]
[[Category: dinuclear metal-cluster]]
[[Category: oxidoreductase]]
[[Category: ribonucleotide reductase]]
 
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