View source for 1bkw


==p-Hydroxybenzoate hydroxylase (phbh) mutant with cys116 replaced by ser (c116s) and arg44 replaced by lys (r44k), in complex with fad and 4-hydroxybenzoic acid==
<StructureSection load='1bkw' size='340' side='right'caption='[[1bkw]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1bkw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_fluorescens_liquefaciens"_flugge_1886 "bacillus fluorescens liquefaciens" flugge 1886]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BKW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BKW FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=PHB:P-HYDROXYBENZOIC+ACID'>PHB</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/4-hydroxybenzoate_3-monooxygenase 4-hydroxybenzoate 3-monooxygenase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.14.13.2 1.14.13.2] </span></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=1bkw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bkw OCA], [https://pdbe.org/1bkw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bkw RCSB], [https://www.ebi.ac.uk/pdbsum/1bkw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bkw ProSAT]</span></td></tr>
</table>
== 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/bk/1bkw_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=1bkw ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Arg44, located at the si-face side of the flavin ring in 4-hydroxybenzoate hydroxylase, was changed to lysine by site-specific mutagenesis. Crystals of [R44K]4-hydroxybenzoate hydroxylase complexed with 4-hydroxybenzoate diffract to 0.22-nm resolution. The structure of [R44K]4-hydroxybenzoate hydroxylase is identical to the wild-type enzyme except for local changes in the vicinity of the mutation. The peptide unit between Ile43 and Lys44 is flipped by about 180 degrees in 50% of the molecules. The phi, psi angles in both the native and flipped conformation are outside the allowed regions and indicate a strained conformation. [R44K]4-Hydroxybenzoate hydroxylase has a decreased affinity for the flavin prosthetic group. This is ascribed to the lost interactions between the side chain of Arg44 and the diphosphoribose moiety of the FAD. The replacement of Arg44 by Lys does not change the position of the flavin ring which occupies the same interior position as in wild type. [R44K]4-Hydroxybenzoate hydroxylase fully couples flavin reduction to substrate hydroxylation. Stopped-flow kinetics showed that the effector role of 4-hydroxybenzoate is largely conserved in the mutant. Replacement of Arg44 by Lys however affects NADPH binding, resulting in a low yield of the charge-transfer species between reduced flavin and NADP+. It is inferred from these data that Arg44 is indispensable for optimal catalysis.

Structure and function of mutant Arg44Lys of 4-hydroxybenzoate hydroxylase implications for NADPH binding.,Eppink MH, Schreuder HA, Van Berkel WJ Eur J Biochem. 1995 Jul 1;231(1):157-65. PMID:7628466<ref>PMID:7628466</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 1bkw" style="background-color:#fffaf0;"></div>

==See Also==
*[[Hydroxylases 3D structures|Hydroxylases 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus fluorescens liquefaciens flugge 1886]]
[[Category: 4-hydroxybenzoate 3-monooxygenase]]
[[Category: Large Structures]]
[[Category: Berkel, W J.Van]]
[[Category: Eppink, M H]]
[[Category: Schreuder, H A]]
[[Category: Hydroxybenzoate]]
[[Category: Oxidoreductase]]