2r3d: Difference between revisions
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|PDB= 2r3d |SIZE=350|CAPTION= <scene name='initialview01'>2r3d</scene>, resolution 2.090Å | |PDB= 2r3d |SIZE=350|CAPTION= <scene name='initialview01'>2r3d</scene>, resolution 2.090Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=ACM:ACETAMIDE'>ACM</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/rRNA_N-glycosylase rRNA N-glycosylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.22 3.2.2.22] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/rRNA_N-glycosylase rRNA N-glycosylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.2.22 3.2.2.22] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY=[[2pjo|2PJO]], [[2r2x|2R2X]], [[2p8n|2P8N]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2r3d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2r3d OCA], [http://www.ebi.ac.uk/pdbsum/2r3d PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2r3d RCSB]</span> | |||
}} | }} | ||
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[[Category: Mulligan, S.]] | [[Category: Mulligan, S.]] | ||
[[Category: Soares, A S.]] | [[Category: Soares, A S.]] | ||
[[Category: glycoprotein]] | [[Category: glycoprotein]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
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[[Category: toxin]] | [[Category: toxin]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 04:56:04 2008'' | ||
Revision as of 04:56, 31 March 2008
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| , resolution 2.090Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , | ||||||
| Activity: | rRNA N-glycosylase, with EC number 3.2.2.22 | ||||||
| Related: | 2PJO, 2R2X, 2P8N
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Ricin A-chain (recombinant) complex with Acetamide
OverviewOverview
BACKGROUND: Ricin is a potent toxin and known bioterrorism threat with no available antidote. The ricin A-chain (RTA) acts enzymatically to cleave a specific adenine base from ribosomal RNA, thereby blocking translation. To understand better the relationship between ligand binding and RTA active site conformational change, we used a fragment-based approach to find a minimal set of bonding interactions able to induce rearrangements in critical side-chain positions. RESULTS: We found that the smallest ligand stabilizing an open conformer of the RTA active site pocket was an amide group, bound weakly by only a few hydrogen bonds to the protein. Complexes with small amide-containing molecules also revealed a switch in geometry from a parallel towards a splayed arrangement of an arginine-tryptophan cation-pi interaction that was associated with an increase and red-shift in tryptophan fluorescence upon ligand binding. Using the observed fluorescence signal, we determined the thermodynamic changes of adenine binding to the RTA active site, as well as the site-specific binding of urea. Urea binding had a favorable enthalpy change and unfavorable entropy change, with a DeltaH of -13 +/- 2 kJ/mol and a DeltaS of -0.04 +/- 0.01 kJ/(K*mol). The side-chain position of residue Tyr80 in a complex with adenine was found not to involve as large an overlap of rings with the purine as previously considered, suggesting a smaller role for aromatic stacking at the RTA active site. CONCLUSION: We found that amide ligands can bind weakly but specifically to the ricin active site, producing significant shifts in positions of the critical active site residues Arg180 and Tyr80. These results indicate that fragment-based drug discovery methods are capable of identifying minimal bonding determinants of active-site side-chain rearrangements and the mechanistic origins of spectroscopic shifts. Our results suggest that tryptophan fluorescence provides a sensitive probe for the geometric relationship of arginine-tryptophan pairs, which often have significant roles in protein function. Using the unusual characteristics of the RTA system, we measured the still controversial thermodynamic changes of site-specific urea binding to a protein, results that are relevant to understanding the physical mechanisms of protein denaturation.
About this StructureAbout this Structure
2R3D is a Single protein structure of sequence from Ricinus communis. This structure supersedes the now removed PDB entry 1ZB2. Full crystallographic information is available from OCA.
ReferenceReference
Fragment-based identification of determinants of conformational and spectroscopic change at the ricin active site., Carra JH, McHugh CA, Mulligan S, Machiesky LM, Soares AS, Millard CB, BMC Struct Biol. 2007 Nov 6;7:72. PMID:17986339
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