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1wuo

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Revision as of 09:45, 11 September 2015

Crystal structure of metallo-beta-lactamase IMP-1 mutant (D81A)

Structural highlights

1wuo is a 4 chain structure with sequence from "bacillus_marcescens"_(bizio_1823)_trevisan_in_de_toni_and_trevisan_1889 "bacillus marcescens" (bizio 1823) trevisan in de toni and trevisan 1889. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
NonStd Res:
Related:	1wup
Gene:	BLAIMP-1 ("Bacillus marcescens" (Bizio 1823) Trevisan in de Toni and Trevisan 1889)
Activity:	Beta-lactamase, with EC number 3.5.2.6
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[BLAB_SERMA] Confers resistance to imipenem and broad-spectrum beta-lactams. Also hydrolyzes carbapenems.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Metallo-beta-lactamase IMP-1 is a di-Zn(II) metalloenzyme that efficiently hydrolyzes beta-lactam antibiotics. Wild-type (WT) IMP-1 has a conserved Asp-120(81) in the active site, which plays an important role in catalysis. To probe the catalytic role of Asp-120(81) in IMP-1, the IMP-1 mutants, D120(81)A and D120(81)E, were prepared by site-directed mutagenesis, and various kinetics studies were conducted. The IMP-1 mutants exhibited 10(2)-10(4)-fold drops in k(cat) values compared with WT despite the fact that they contained two Zn(II) ions in the active site. To evaluate the acid-base characteristics of Asp-120(81), the pH dependence for hydrolysis was examined by stopped-flow studies. No observable pK(a) values between pH 5 and 9 were found for WT and D120(81)A. The rapid mixing of equimolar amounts of nitrocefin and all enzymes failed to result in the detection of an anion intermediate of nitrocefin at 650 nm. These results suggest that Asp-120(81) of IMP-1 is not a factor in decreasing the pK(a) for the water bridging two Zn(II) ions and is not a proton donor to the anionic intermediate. In the case of D120(81)E, the nitrocefin hydrolysis product, which shows a maximum absorption at 460 nm, was bound to D120(81)E in the protonated form. The three-dimensional structures of D120(81)A and D120(81)E were also determined at 2.0 and 3.0 A resolutions, respectively. In the case of D120(81)E, the Zn-Zn distance was increased by 0.3 A compared with WT, due to the change in the coordination mode of Glu-120(81)OE1 and the positional shift in the conserved His-263(197) at the active site.

Probing the role of Asp-120(81) of metallo-beta-lactamase (IMP-1) by site-directed mutagenesis, kinetic studies, and X-ray crystallography.,Yamaguchi Y, Kuroki T, Yasuzawa H, Higashi T, Jin W, Kawanami A, Yamagata Y, Arakawa Y, Goto M, Kurosaki H J Biol Chem. 2005 May 27;280(21):20824-32. Epub 2005 Mar 23. PMID:15788415^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Yamaguchi Y, Kuroki T, Yasuzawa H, Higashi T, Jin W, Kawanami A, Yamagata Y, Arakawa Y, Goto M, Kurosaki H. Probing the role of Asp-120(81) of metallo-beta-lactamase (IMP-1) by site-directed mutagenesis, kinetic studies, and X-ray crystallography. J Biol Chem. 2005 May 27;280(21):20824-32. Epub 2005 Mar 23. PMID:15788415 doi:10.1074/jbc.M414314200

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 See Also
6 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1wuo"

@@ Line 8: / Line 8: @@
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">BLAIMP-1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=615 "Bacillus marcescens" (Bizio 1823) Trevisan in de Toni and Trevisan 1889])</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Beta-lactamase Beta-lactamase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.2.6 3.5.2.6] </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=1wuo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wuo OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1wuo RCSB], [http://www.ebi.ac.uk/pdbsum/1wuo PDBsum]</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=1wuo FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wuo OCA], [http://pdbe.org/1wuo PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1wuo RCSB], [http://www.ebi.ac.uk/pdbsum/1wuo PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 30: / Line 30: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1wuo" style="background-color:#fffaf0;"></div>
 ==See Also==

1wuo

From Proteopedia

Revision as of 09:45, 11 September 2015

Crystal structure of metallo-beta-lactamase IMP-1 mutant (D81A)

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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