1axb

From Proteopedia

(Difference between revisions)

Revision as of 16:51, 28 August 2019

TEM-1 BETA-LACTAMASE FROM ESCHERICHIA COLI INHIBITED WITH AN ACYLATION TRANSITION STATE ANALOG

Structural highlights

1axb is a 1 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Activity:	Beta-lactamase, with EC number 3.5.2.6
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[BLAT_ECOLX] TEM-type are the most prevalent beta-lactamases in enterobacteria; they hydrolyze the beta-lactam bond in susceptible beta-lactam antibiotics, thus conferring resistance to penicillins and cephalosporins. TEM-3 and TEM-4 are capable of hydrolyzing cefotaxime and ceftazidime. TEM-5 is capable of hydrolyzing ceftazidime. TEM-6 is capable of hydrolyzing ceftazidime and aztreonam. TEM-8/CAZ-2, TEM-16/CAZ-7 and TEM-24/CAZ-6 are markedly active against ceftazidime. IRT-4 shows resistance to beta-lactamase inhibitors.

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

The crystal structure of a phosphonate complex of the class A TEM-1 beta-lactamase has been determined to a resolution of 2.0 A. The phosphonate appears stoichiometrically at the active site, bound covalently to Ser70Ogamma, with one phosphonyl oxygen in the oxyanion hole. Although the overall structure is very similar to that of the native enzyme (rms difference 0.37 A for all heavy atoms), changes have occurred in the position of active site functional groups. The active site is also not in the conformation observed in the complex of another class A beta-lactamase, that of Staphylococcus aureus PC1, with the same phosphonate [Chen, C. C. H., et al. (1993) J. Mol. Biol. 234,165-178]. Both phosphonate structures, however, can be seen to represent models of acylation transition-states since in each the deacylating water molecule appears firmly bound to the Glu166 carboxylate group. The major difference between the structures lies in the positioning of Lys73Nzeta and Ser130Ogamma. In the S. aureus structure, the closest interaction of these functional groups is between Lys73Nzeta and Ser70Ogamma (2.8 A), while in the TEM-1 structure it is between Ser130Ogamma and the second phosphonyl oxygen of the bound inhibitor (2.8 A). The former structure therefore may resemble a transition state for formation of the tetrahedral species in acylation by nucleophilic attack on the substrate, where Lys73Nzeta presumably catalyzes the reaction as a general base. The TEM-1 structure can then be seen as an analogue of the transition state for breakdown of the tetrahedral species, where Ser130Ogamma is acting as a general acid, assisting the departure of the leaving group. The class A beta-lactamase crystal structures now available lead to a self-consistent proposal for a mechanism of catalysis by these enzymes.

Crystal structure of an acylation transition-state analog of the TEM-1 beta-lactamase. Mechanistic implications for class A beta-lactamases.,Maveyraud L, Pratt RF, Samama JP Biochemistry. 1998 Feb 24;37(8):2622-8. PMID:9485412^[1]

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

References

↑ Maveyraud L, Pratt RF, Samama JP. Crystal structure of an acylation transition-state analog of the TEM-1 beta-lactamase. Mechanistic implications for class A beta-lactamases. Biochemistry. 1998 Feb 24;37(8):2622-8. PMID:9485412 doi:10.1021/bi972501b

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/1axb"

@@ Line 1: / Line 1: @@
 ==TEM-1 BETA-LACTAMASE FROM ESCHERICHIA COLI INHIBITED WITH AN ACYLATION TRANSITION STATE ANALOG==
-<StructureSection load='1axb' size='340' side='right' caption='[[1axb]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
+<StructureSection load='1axb' size='340' side='right'caption='[[1axb]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1axb]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AXB OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AXB FirstGlance]. <br>
@@ Line 14: / Line 14: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ax/1axb_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ax/1axb_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 29: / Line 29: @@
 </div>
 <div class="pdbe-citations 1axb" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]]
 == References ==
 <references/>
@@ Line 35: / Line 38: @@
 [[Category: Bacillus coli migula 1895]]
 [[Category: Beta-lactamase]]
+[[Category: Large Structures]]
 [[Category: Maveyraud, L]]
 [[Category: Pratt, R F]]

1axb

From Proteopedia

Revision as of 16:51, 28 August 2019

TEM-1 BETA-LACTAMASE FROM ESCHERICHIA COLI INHIBITED WITH AN ACYLATION TRANSITION STATE ANALOG

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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