View source for 2b5r


==1B Lactamase / B Lactamase Inhibitor==
<StructureSection load='2b5r' size='340' side='right'caption='[[2b5r]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2b5r]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895] and [http://en.wikipedia.org/wiki/As_4.1611 As 4.1611]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B5R OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2B5R FirstGlance]. <br>
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">bla ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</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=2b5r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2b5r OCA], [http://pdbe.org/2b5r PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2b5r RCSB], [http://www.ebi.ac.uk/pdbsum/2b5r PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2b5r ProSAT], [http://www.topsan.org/Proteins/ISPC/2b5r TOPSAN]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/BLAT_ECOLX 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. [[http://www.uniprot.org/uniprot/BLIP_STRCL BLIP_STRCL]] Inhibits a wide variety of beta lactamases. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/b5/2b5r_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2b5r ConSurf].
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== Publication Abstract from PubMed ==
Proteins bind one another in aqua's solution to form tight and specific complexes. Previously we have shown that this is achieved through the modular architecture of the interaction network formed by the interface residues, where tight cooperative interactions are found within modules but not between them. Here we extend this study to cover the entire interface of TEM1 beta-lactamase and its protein inhibitor BLIP using an improved method for deriving interaction maps based on REDUCE to add hydrogen atoms and then by evaluating the interactions using modifications of the programs PROBE, NCI and PARE. An extensive mutagenesis study of the interface residues indeed showed that each module is energetically independent on other modules, and that cooperativity is found only within a module. By solving the X-ray structure of two interface mutations affecting two different modules, we demonstrated that protein-protein binding occur via the structural reorganization of the binding modules, either by a "lock and key" or an induced fit mechanism. To explain the cooperativity within a module, we performed multiple-mutant cycle analysis of cluster 2 resulting in a high-resolution energy map of this module. Mutant studies are usually done in reference to alanine, which can be regarded as a deletion of a side-chain. However, from a biological perspective, there is a major interest to understand non-Ala substitutions, as they are most common. Using X-ray crystallography and multiple-mutant cycle analysis we demonstrated the added complexity in understanding non-Ala mutations. Here, a double mutation replacing the wild-type Glu,Tyr to Tyr,Asn on TEM1 (res id 104,105) caused a major backbone structural rearrangement of BLIP, changing the composition of two modules but not of other modules within the interface. This shows the robustness of the modular approach, yet demonstrates the complexity of in silico protein design.

Binding hot spots in the TEM1-BLIP interface in light of its modular architecture.,Reichmann D, Cohen M, Abramovich R, Dym O, Lim D, Strynadka NC, Schreiber G J Mol Biol. 2007 Jan 19;365(3):663-79. Epub 2006 Oct 3. PMID:17070843<ref>PMID:17070843</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Beta-lactamase 3D structures|Beta-lactamase 3D structures]]
*[[TEM1-beta-Lactamase/beta-lactamase Inhibitor Protein (BLIP)|TEM1-beta-Lactamase/beta-lactamase Inhibitor Protein (BLIP)]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus coli migula 1895]]
[[Category: As 4 1611]]
[[Category: Beta-lactamase]]
[[Category: Large Structures]]
[[Category: Albeck, S]]
[[Category: Dym, O]]
[[Category: ISPC, Israel Structural Proteomics Center]]
[[Category: Meged, R]]
[[Category: Rahat, O]]
[[Category: Screiber, G]]
[[Category: Hydrolase-hydrolase inhibitor complex]]
[[Category: Protein-protein complex]]
[[Category: Structural genomic]]