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==Crystal structure of Acinetobacter baumannii PBP1a in complex with Aztreonam== | |||
<StructureSection load='3ue0' size='340' side='right' caption='[[3ue0]], [[Resolution|resolution]] 2.60Å' scene=''> | |||
{{ | == Structural highlights == | ||
<table><tr><td colspan='2'>[[3ue0]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Acinetobacter_baumannii Acinetobacter baumannii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3UE0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3UE0 FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AZR:2-({[(1Z)-1-(2-AMINO-1,3-THIAZOL-4-YL)-2-OXO-2-{[(2S,3S)-1-OXO-3-(SULFOAMINO)BUTAN-2-YL]AMINO}ETHYLIDENE]AMINO}OXY)-2-METHYLPROPANOIC+ACID'>AZR</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3udf|3udf]], [[3udi|3udi]], [[3udx|3udx]], [[3ue1|3ue1]], [[3ue3|3ue3]]</td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ponA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=470 Acinetobacter baumannii])</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=3ue0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3ue0 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3ue0 RCSB], [http://www.ebi.ac.uk/pdbsum/3ue0 PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Multi-drug-resistant forms of the Gram-negative pathogen Acinetobacter baumannii are an emerging threat to human health and further complicate the general problem of treating serious bacterial infections. Meeting this challenge requires an improved understanding of the relationships between the structures of major therapeutic targets in this organism and the activity levels exhibited against it by different antibiotics. Here we report the first crystal structures of A. baumannii penicillin-binding proteins (PBPs) covalently inactivated by four beta-lactam antibiotics. We also relate the results to kinetic, biophysical, and computational data. The structure of the class A protein PBP1a was solved in apo form and for its covalent conjugates with benzyl penicillin, imipenem, aztreonam, and the siderophore-conjugated monocarbam MC-1. It included a novel domain genetically spliced into a surface loop of the transpeptidase domain that contains three conserved loops. Also reported here is the first high-resolution structure of the A. baumannii class B enzyme PBP3 in apo form. Comparison of this structure with that of MC-1-derivatized PBP3 of Pseudomonas aeruginosa identified differences between these orthologous proteins in A. baumannii and P. aeruginosa. Thermodynamic analyses indicated that desolvation effects in the PBP3 ligand-binding sites contributed significantly to the thermal stability of the enzyme-antibiotic covalent complexes. Across a significant range of values, they correlated well with results from studies of inactivation kinetics and the protein structures. The structural, biophysical, and computational data help rationalize differences in the functional performance of antibiotics against different protein targets and can be used to guide the design of future agents. | |||
Distinctive Attributes of beta-Lactam Target Proteins in Acinetobacter baumannii Relevant to Development of New Antibiotics.,Han S, Caspers N, Zaniewski RP, Lacey BM, Tomaras AP, Feng X, Geoghegan KF, Shanmugasundaram V J Am Chem Soc. 2011 Nov 28. PMID:22050378<ref>PMID:22050378</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
==See Also== | |||
*[[Penicillin-binding protein|Penicillin-binding protein]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Acinetobacter baumannii]] | [[Category: Acinetobacter baumannii]] | ||
[[Category: Han, S | [[Category: Han, S]] | ||
[[Category: Penicillin-binding protein-antibiotic complex]] | [[Category: Penicillin-binding protein-antibiotic complex]] | ||
[[Category: Transglycosylase]] | [[Category: Transglycosylase]] | ||
[[Category: Transpeptidase]] | [[Category: Transpeptidase]] | ||
Revision as of 09:58, 21 December 2014
Crystal structure of Acinetobacter baumannii PBP1a in complex with AztreonamCrystal structure of Acinetobacter baumannii PBP1a in complex with Aztreonam
Structural highlights
Publication Abstract from PubMedMulti-drug-resistant forms of the Gram-negative pathogen Acinetobacter baumannii are an emerging threat to human health and further complicate the general problem of treating serious bacterial infections. Meeting this challenge requires an improved understanding of the relationships between the structures of major therapeutic targets in this organism and the activity levels exhibited against it by different antibiotics. Here we report the first crystal structures of A. baumannii penicillin-binding proteins (PBPs) covalently inactivated by four beta-lactam antibiotics. We also relate the results to kinetic, biophysical, and computational data. The structure of the class A protein PBP1a was solved in apo form and for its covalent conjugates with benzyl penicillin, imipenem, aztreonam, and the siderophore-conjugated monocarbam MC-1. It included a novel domain genetically spliced into a surface loop of the transpeptidase domain that contains three conserved loops. Also reported here is the first high-resolution structure of the A. baumannii class B enzyme PBP3 in apo form. Comparison of this structure with that of MC-1-derivatized PBP3 of Pseudomonas aeruginosa identified differences between these orthologous proteins in A. baumannii and P. aeruginosa. Thermodynamic analyses indicated that desolvation effects in the PBP3 ligand-binding sites contributed significantly to the thermal stability of the enzyme-antibiotic covalent complexes. Across a significant range of values, they correlated well with results from studies of inactivation kinetics and the protein structures. The structural, biophysical, and computational data help rationalize differences in the functional performance of antibiotics against different protein targets and can be used to guide the design of future agents. Distinctive Attributes of beta-Lactam Target Proteins in Acinetobacter baumannii Relevant to Development of New Antibiotics.,Han S, Caspers N, Zaniewski RP, Lacey BM, Tomaras AP, Feng X, Geoghegan KF, Shanmugasundaram V J Am Chem Soc. 2011 Nov 28. PMID:22050378[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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