4xje: Difference between revisions
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4xje FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xje OCA], [http://pdbe.org/4xje PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4xje RCSB], [http://www.ebi.ac.uk/pdbsum/4xje PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4xje ProSAT]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4xje FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xje OCA], [http://pdbe.org/4xje PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4xje RCSB], [http://www.ebi.ac.uk/pdbsum/4xje PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4xje ProSAT]</span></td></tr> | ||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Aminoglycoside antibiotics have lost much of their effectiveness due to widespread resistance, primarily via covalent modification. One of the most ubiquitous enzymes responsible for aminoglycoside resistance is aminoglycoside O-nucleotidyltransferase(2''), which catalyzes a nucleotidylation reaction. Due to its clinical importance, much research has focused on dissecting the mechanism of action, some of it dating back more than 30 years. Here, we present structural data for catalytically informative states of the enzyme, i.e., ANT(2'') in complex with adenosine monophosphate (AMP) and tobramycin (inactive-intermediate state) and in complex with adenylyl-2''-tobramycin, pyrophosphate, and Mn(2+)(product-bound state). These two structures in conjunction with our previously reported structure of ANT(2'')'s substrate-bound complex capture clinical states along ANT(2'')'s reaction coordinate. Additionally, isothermal titration calorimetry (ITC)-based studies are presented that assess the order of substrate binding and product release. Combined, these results outline a kinetic mechanism for ANT(2'') that contradicts what has been previously reported. Specifically, we show that the release of adenylated aminoglycoside precedes pyrophosphate. Furthermore, the ternary complex structures provide additional details on the catalytic mechanism, which reveals extensive similarities to the evolutionarily related DNA polymerase-beta superfamily. | |||
Revisiting the Catalytic Cycle and Kinetic Mechanism of Aminoglycoside O-Nucleotidyltransferase(2''): A Structural and Kinetic Study.,Bassenden AV, Park J, Rodionov D, Berghuis AM ACS Chem Biol. 2020 Mar 6. doi: 10.1021/acschembio.9b00904. PMID:32100995<ref>PMID:32100995</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
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<div class="pdbe-citations 4xje" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
Revision as of 13:09, 18 March 2020
CRYSTAL STRUCTURE OF ANT(2") IN COMPLEX WITH AMP AND TOBRAMYCINCRYSTAL STRUCTURE OF ANT(2") IN COMPLEX WITH AMP AND TOBRAMYCIN
Structural highlights
Publication Abstract from PubMedAminoglycoside antibiotics have lost much of their effectiveness due to widespread resistance, primarily via covalent modification. One of the most ubiquitous enzymes responsible for aminoglycoside resistance is aminoglycoside O-nucleotidyltransferase(2), which catalyzes a nucleotidylation reaction. Due to its clinical importance, much research has focused on dissecting the mechanism of action, some of it dating back more than 30 years. Here, we present structural data for catalytically informative states of the enzyme, i.e., ANT(2) in complex with adenosine monophosphate (AMP) and tobramycin (inactive-intermediate state) and in complex with adenylyl-2-tobramycin, pyrophosphate, and Mn(2+)(product-bound state). These two structures in conjunction with our previously reported structure of ANT(2)'s substrate-bound complex capture clinical states along ANT(2)'s reaction coordinate. Additionally, isothermal titration calorimetry (ITC)-based studies are presented that assess the order of substrate binding and product release. Combined, these results outline a kinetic mechanism for ANT(2) that contradicts what has been previously reported. Specifically, we show that the release of adenylated aminoglycoside precedes pyrophosphate. Furthermore, the ternary complex structures provide additional details on the catalytic mechanism, which reveals extensive similarities to the evolutionarily related DNA polymerase-beta superfamily. Revisiting the Catalytic Cycle and Kinetic Mechanism of Aminoglycoside O-Nucleotidyltransferase(2): A Structural and Kinetic Study.,Bassenden AV, Park J, Rodionov D, Berghuis AM ACS Chem Biol. 2020 Mar 6. doi: 10.1021/acschembio.9b00904. PMID:32100995[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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