1h7b: Difference between revisions
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|PDB= 1h7b |SIZE=350|CAPTION= <scene name='initialview01'>1h7b</scene>, resolution 2.45Å | |PDB= 1h7b |SIZE=350|CAPTION= <scene name='initialview01'>1h7b</scene>, resolution 2.45Å | ||
|SITE= <scene name='pdbsite=AC1:Po4+Binding+Site+For+Chain+A'>AC1</scene> | |SITE= <scene name='pdbsite=AC1:Po4+Binding+Site+For+Chain+A'>AC1</scene> | ||
|LIGAND= <scene name='pdbligand=PO4:PHOSPHATE ION'>PO4</scene> | |LIGAND= <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Ribonucleoside-triphosphate_reductase Ribonucleoside-triphosphate reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.17.4.2 1.17.4.2] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Ribonucleoside-triphosphate_reductase Ribonucleoside-triphosphate reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.17.4.2 1.17.4.2] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1h7b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1h7b OCA], [http://www.ebi.ac.uk/pdbsum/1h7b PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1h7b RCSB]</span> | |||
}} | }} | ||
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==About this Structure== | ==About this Structure== | ||
1H7B is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/ | 1H7B is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_t4 Enterobacteria phage t4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H7B OCA]. | ||
==Reference== | ==Reference== | ||
Structural basis for allosteric substrate specificity regulation in anaerobic ribonucleotide reductases., Larsson KM, Andersson J, Sjoberg BM, Nordlund P, Logan DT, Structure. 2001 Aug;9(8):739-50. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11587648 11587648] | Structural basis for allosteric substrate specificity regulation in anaerobic ribonucleotide reductases., Larsson KM, Andersson J, Sjoberg BM, Nordlund P, Logan DT, Structure. 2001 Aug;9(8):739-50. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11587648 11587648] | ||
[[Category: Enterobacteria phage | [[Category: Enterobacteria phage t4]] | ||
[[Category: Ribonucleoside-triphosphate reductase]] | [[Category: Ribonucleoside-triphosphate reductase]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: Nordlund, P.]] | [[Category: Nordlund, P.]] | ||
[[Category: Sjoeberg, B M.]] | [[Category: Sjoeberg, B M.]] | ||
[[Category: allosteric regulation]] | [[Category: allosteric regulation]] | ||
[[Category: oxidoreductase]] | [[Category: oxidoreductase]] | ||
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[[Category: substrate specificity]] | [[Category: substrate specificity]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:59:21 2008'' | ||
Revision as of 20:59, 30 March 2008
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| , resolution 2.45Å | |||||||
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| Sites: | |||||||
| Ligands: | |||||||
| Activity: | Ribonucleoside-triphosphate reductase, with EC number 1.17.4.2 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STRUCTURAL BASIS FOR ALLOSTERIC SUBSTRATE SPECIFICITY REGULATION IN CLASS III RIBONUCLEOTIDE REDUCTASES, NATIVE NRDD
OverviewOverview
BACKGROUND: The specificity of ribonucleotide reductases (RNRs) toward their four substrates is governed by the binding of deoxyribonucleoside triphosphates (dNTPs) to the allosteric specificity site. Similar patterns in the kinetics of allosteric regulation have been a strong argument for a common evolutionary origin of the three otherwise widely divergent RNR classes. Recent structural information settled the case for divergent evolution; however, the structural basis for transmission of the allosteric signal is currently poorly understood. A comparative study of the conformational effects of the binding of different effectors has not yet been possible; in addition, only one RNR class has been studied. RESULTS: Our presentation of the structures of a class III anaerobic RNR in complex with four dNTPs allows a full comparison of the protein conformations. Discrimination among the effectors is achieved by two side chains, Gln-114 and Glu-181, from separate monomers. Large conformational changes in the active site (loop 2), in particular Phe-194, are induced by effector binding. The conformational differences observed in the protein when the purine effectors are compared with the pyrimidine effectors are large, while the differences observed within the purine group itself are more subtle. CONCLUSIONS: The subtle differences in base size and hydrogen bonding pattern at the effector site are communicated to major conformational changes in the active site. We propose that the altered overlap of Phe-194 with the substrate base governs hydrogen bonding patterns with main and side chain hydrogen bonding groups in the active site. The relevance for evolution is discussed.
About this StructureAbout this Structure
1H7B is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.
ReferenceReference
Structural basis for allosteric substrate specificity regulation in anaerobic ribonucleotide reductases., Larsson KM, Andersson J, Sjoberg BM, Nordlund P, Logan DT, Structure. 2001 Aug;9(8):739-50. PMID:11587648
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