1av8
From Proteopedia
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| - | [[Image:1av8.gif|left|200px]] | + | [[Image:1av8.gif|left|200px]] |
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| - | '''RIBONUCLEOTIDE REDUCTASE R2 SUBUNIT FROM E. COLI''' | + | {{Structure |
| + | |PDB= 1av8 |SIZE=350|CAPTION= <scene name='initialview01'>1av8</scene>, resolution 2.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=FEO:MU-OXO-DIIRON'>FEO</scene> | ||
| + | |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] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''RIBONUCLEOTIDE REDUCTASE R2 SUBUNIT FROM E. COLI''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1AV8 is a [ | + | 1AV8 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AV8 OCA]. |
==Reference== | ==Reference== | ||
| - | Characterization of Y122F R2 of Escherichia coli ribonucleotide reductase by time-resolved physical biochemical methods and X-ray crystallography., Tong W, Burdi D, Riggs-Gelasco P, Chen S, Edmondson D, Huynh BH, Stubbe J, Han S, Arvai A, Tainer J, Biochemistry. 1998 Apr 28;37(17):5840-8. PMID:[http:// | + | Characterization of Y122F R2 of Escherichia coli ribonucleotide reductase by time-resolved physical biochemical methods and X-ray crystallography., Tong W, Burdi D, Riggs-Gelasco P, Chen S, Edmondson D, Huynh BH, Stubbe J, Han S, Arvai A, Tainer J, Biochemistry. 1998 Apr 28;37(17):5840-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9558317 9558317] |
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Ribonucleoside-diphosphate reductase]] | [[Category: Ribonucleoside-diphosphate reductase]] | ||
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[[Category: oxidoreductase]] | [[Category: oxidoreductase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:02:40 2008'' |
Revision as of 08:02, 20 March 2008
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| , resolution 2.8Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Activity: | Ribonucleoside-diphosphate reductase, with EC number 1.17.4.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
RIBONUCLEOTIDE REDUCTASE R2 SUBUNIT FROM E. COLI
Overview
Ribonucleotide reductase (RNR) from Escherichia coli catalyzes the conversion of ribonucleotides to deoxyribonucleotides. It is composed of two homodimeric subunits, R1 and R2. R2 contains the diferric-tyrosyl radical cofactor essential for the nucleotide reduction process. The in vitro mechanism of assembly of this cluster starting with apo R2 or with a diferrous form of R2 has been examined by time-resolved physical biochemical methods. An intermediate, Fe3+/Fe4+ cluster (intermediate X), has been identified that is thought to be directly involved in the oxidation of Y122 to the tyrosyl radical (*Y122). An R2 mutant in which phenylalanine has replaced Y122 has been used to accumulate intermediate X at sufficient levels that it can be studied using a variety of spectroscopic methods. The details of the reconstitution of the apo and diferrous forms of Y122F R2 have been examined by stopped-flow UV/vis spectroscopy and by rapid freeze quench electron paramagnetic resonance, and Mossbauer spectroscopies. In addition the structure of this mutant, crystallized at pH 7.6 in the absence of mercury, at 2.46 A resolution has been determined. These studies suggest that Y122F R2 is an appropriate model for the examination of intermediate X in the assembly process. Studies with two mutants, Y356F and double mutant Y356F and Y122F R2, are interpreted in terms of the possible role of Y356 in the putative electron transfer reaction between the R1 and R2 subunits of this RNR.
About this Structure
1AV8 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Characterization of Y122F R2 of Escherichia coli ribonucleotide reductase by time-resolved physical biochemical methods and X-ray crystallography., Tong W, Burdi D, Riggs-Gelasco P, Chen S, Edmondson D, Huynh BH, Stubbe J, Han S, Arvai A, Tainer J, Biochemistry. 1998 Apr 28;37(17):5840-8. PMID:9558317
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