Sandbox Reserved 642: Difference between revisions

== '''Structure''' ==

<Structure load='2PAH_tetramer3.pdb' size='500' frame='true' align='right' caption='This is a model of the pheylalanine hydroxylase dimer as found in humans. The green ball in within each subunit represents the iron ion in the catalytic domains. ' scene='Insert optional scene name here' /> <ref>[http://www.rcsb.org/pdb/explore/explore.do?structureId=2PAH],/ref>

PheOH can exist as a dimer or tetramer with identical subunits. Each subunit is organized  to have a regulatory, catalytic and tetramerization domain. The native form of human PheOH has an estimated secondary structure composed 48% alpha-helices, 28% extended structures, 12% beta-turns, and 12% non-structured conformations. The more structured elements are usually concentrated in the catalytic C-terminal domain of the protein, while the more flexible and unstructured elements are grouped in the regulatory N-terminal domain. The active site of PheOH can be found in the center of the catalytic domain and is characterized by a 13 Angrstrums deep and 10 Angstrums wide hydrophobic pocket. Lining the active site are 3 glutamates, 2 histadines and 1 tyrosine residues. The center of each catalytic domain consists of an iron ion which is vital to the enzyme activity and binds to  histadine residues 285 and 290, 1 oxygen atom and glutamate 330. The PheOH model protein was generated via xray crystallography.