View source for 1cij


==HALOALKANE DEHALOGENASE SOAKED WITH HIGH CONCENTRATION OF BROMIDE==
<StructureSection load='1cij' size='340' side='right'caption='[[1cij]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1cij]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Xanthobacter_autotrophicus Xanthobacter autotrophicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CIJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CIJ 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BR:BROMIDE+ION'>BR</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=1cij FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cij OCA], [https://pdbe.org/1cij PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cij RCSB], [https://www.ebi.ac.uk/pdbsum/1cij PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cij ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DHLA_XANAU DHLA_XANAU] Catalyzes hydrolytic cleavage of carbon-halogen bonds in halogenated aliphatic compounds, leading to the formation of the corresponding primary alcohols, halide ions and protons. Has a broad substrate specificity, which includes terminally mono- and di- chlorinated and brominated alkanes (up to C4 only). The highest activity was found with 1,2-dichloroethane, 1,3-dichloropropane, and 1,2-dibromoethane.
== 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/ci/1cij_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=1cij ConSurf].
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== Publication Abstract from PubMed ==
Haloalkane dehalogenase (DhlA) converts haloalkanes to their corresponding alcohols and halide ions. The rate-limiting step in the reaction of DhlA is the release of the halide ion. The kinetics of halide release have been analyzed by measuring halide binding with stopped-flow fluorescence experiments. At high halide concentrations, halide import occurs predominantly via the rapid formation of a weak initial collision complex, followed by transport of the ion to the active site. To obtain more insight in this collision complex, we determined the X-ray structure of DhlA in the presence of bromide and investigated the kinetics of mutants that were constructed on the basis of this structure. The X-ray structure revealed one bromide ion firmly bound in the active site and two bromide ions weakly bound on the surface of the enzyme. One of the weakly bound ions is close to Thr197 and Phe294, near the entrance of the earlier proposed tunnel for substrate import. Kinetic analysis of bromide import by the Thr197Ala and Phe294Ala mutants of DhlA at high halide concentration showed that the rate constants for halide binding no longer displayed a wild-type-like parabolic increase with increasing bromide concentrations. This is in agreement with an elimination or a decrease in affinity of the surface-located halide-binding site. Likewise, chloride binding kinetics of the mutants indicated significant differences with wild-type enzyme. The results indicate that Thr197 and Phe294 are involved in the formation of an initial collision complex for halide import in DhlA and provide experimental evidence for the role of the tunnel in substrate and product transport.

Crystallographic and kinetic evidence of a collision complex formed during halide import in haloalkane dehalogenase.,Pikkemaat MG, Ridder IS, Rozeboom HJ, Kalk KH, Dijkstra BW, Janssen DB Biochemistry. 1999 Sep 14;38(37):12052-61. PMID:10508409<ref>PMID:10508409</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1cij" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dehalogenase 3D structures|Dehalogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Xanthobacter autotrophicus]]
[[Category: Dijkstra BW]]
[[Category: Kalk KH]]
[[Category: Ridder IS]]
[[Category: Rozeboom HJ]]