View source for 5egq


==Structure of tetrameric rat phenylalanine hydroxylase mutant R270K, residues 25-453==
<StructureSection load='5egq' size='340' side='right'caption='[[5egq]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5egq]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5EGQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5EGQ 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=5egq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5egq OCA], [https://pdbe.org/5egq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5egq RCSB], [https://www.ebi.ac.uk/pdbsum/5egq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5egq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PH4H_RAT PH4H_RAT] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mammalian phenylalanine hydroxylase (PheH) is an allosteric enzyme that catalyzes the first step in the catabolism of the amino acid phenylalanine. Following allosteric activation by high phenylalanine levels, the enzyme catalyzes the pterin-dependent conversion of phenylalanine to tyrosine. Inability to control elevated phenylalanine levels in the blood leads to increased risk of mental disabilities commonly associated with the inherited metabolic disorder, phenylketonuria. Although extensively studied, structural changes associated with allosteric activation in mammalian PheH have been elusive. Here, we examine the complex allosteric mechanisms of rat PheH using X-ray crystallography, isothermal titration calorimetry (ITC), and small-angle X-ray scattering (SAXS). We describe crystal structures of the preactivated state of the PheH tetramer depicting the regulatory domains docked against the catalytic domains and preventing substrate binding. Using SAXS, we further describe the domain movements involved in allosteric activation of PheH in solution and present the first demonstration of chromatography-coupled SAXS with Evolving Factor Analysis (EFA), a powerful method for separating scattering components in a model-independent way. Together, these results support a model for allostery in PheH in which phenylalanine stabilizes the dimerization of the regulatory domains and exposes the active site for substrate binding and other structural changes needed for activity.

Domain Movements upon Activation of Phenylalanine Hydroxylase Characterized by Crystallography and Chromatography-Coupled Small-Angle X-ray Scattering.,Meisburger SP, Taylor AB, Khan CA, Zhang S, Fitzpatrick PF, Ando N J Am Chem Soc. 2016 May 25;138(20):6506-16. doi: 10.1021/jacs.6b01563. Epub 2016 , May 12. PMID:27145334<ref>PMID:27145334</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5egq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Hydroxylases 3D structures|Hydroxylases 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Rattus norvegicus]]
[[Category: Fitzpatrick PF]]
[[Category: Khan CA]]
[[Category: Taylor AB]]