4q8i: Difference between revisions
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==Crystal Structure of beta-lactamase from M.tuberculosis covalently complexed with Tebipenem== | |||
<StructureSection load='4q8i' size='340' side='right'caption='[[4q8i]], [[Resolution|resolution]] 1.90Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[4q8i]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Rv Mycobacterium tuberculosis H37Rv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4Q8I OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4Q8I FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.901Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=TEB:(4R,5S)-3-(1-(4,5-DIHYDROTHIAZOL-2-YL)AZETIDIN-3-YLTHIO)-5-((2S,3R)-3-HYDROXY-1-OXOBUTAN-2-YL)-4-METHYL-4,5-+DIHYDRO-1H-PYRROLE-2-CARBOXYLIC+ACID'>TEB</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4q8i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4q8i OCA], [https://pdbe.org/4q8i PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4q8i RCSB], [https://www.ebi.ac.uk/pdbsum/4q8i PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4q8i ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/BLAC_MYCTU BLAC_MYCTU] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The genome of Mycobacterium tuberculosis contains a gene, blaC, which encodes a highly active beta-lactamase (BlaC). We have previously shown that BlaC has an extremely broad spectrum of activity against penicillins and cephalosporins but weak activity against newer carbapenems. We have shown that carbapenems such as meropenem, doripenem, and ertapenem react with the enzyme to form enzyme-drug covalent complexes that are hydrolyzed extremely slowly. In the current study, we have determined apparent Km and kcat values of 0.8 muM and 0.03 min(-1), respectively, for tebipenem, a novel carbapenem whose prodrug form, the pivalyl ester, is orally available. Tebipenem exhibits slow tight-binding inhibition at low micromolar concentrations versus the chromogenic substrate nitrocefin. FT-ICR mass spectrometry demonstrated that the tebipenem acyl-enzyme complex remains stable for greater than 90 min and exists as mixture of the covalently bound drug and the bound retro-aldol cleavage product. We have also determined the high-resolution crystal structures of the BlaC-tebipenem covalent acylated adduct (1.9 A) with wild-type BlaC and the BlaC-tebipenem Michaelis-Menten complex (1.75 A) with the K73A BlaC variant. These structures are compared to each other and to other carbapenem-BlaC structures. | |||
Tebipenem, a new carbapenem antibiotic, is a slow substrate that inhibits the beta-lactamase from Mycobacterium tuberculosis.,Hazra S, Xu H, Blanchard JS Biochemistry. 2014 Jun 10;53(22):3671-8. doi: 10.1021/bi500339j. Epub 2014 May, 29. PMID:24846409<ref>PMID:24846409</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 4q8i" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Mycobacterium tuberculosis H37Rv]] | |||
[[Category: Blanchard J]] | |||
[[Category: Hazra S]] | |||
Latest revision as of 17:29, 20 September 2023
Crystal Structure of beta-lactamase from M.tuberculosis covalently complexed with Tebipenem
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