View source for 1phz

[[Image:1phz.jpg|left|200px]]<br /><applet load="1phz" size="350" color="white" frame="true" align="right" spinBox="true" 
caption="1phz, resolution 2.20&Aring;" />
'''STRUCTURE OF PHOSPHORYLATED PHENYLALANINE HYDROXYLASE'''<br />

==Overview==
Phenylalanine hydroxylase converts phenylalanine to tyrosine, a rate-limiting step in phenylalanine catabolism and protein and neurotransmitter biosynthesis. It is tightly regulated by the substrates phenylalanine and tetrahydrobiopterin and by phosphorylation. We present the crystal structures of dephosphorylated and phosphorylated forms of a dimeric enzyme with catalytic and regulatory properties of the wild-type protein. The structures reveal a catalytic domain flexibly linked to a regulatory domain. The latter consists of an N-terminal autoregulatory sequence (containing Ser 16, which is the site of phosphorylation) that extends over the active site pocket, and an alpha-beta sandwich core that is, unexpectedly, structurally related to both pterin dehydratase and the regulatory domains of metabolic enzymes. Phosphorylation has no major structural effects in the absence of phenylalanine, suggesting that phenylalanine and phosphorylation act in concert to activate the enzyme through a combination of intrasteric and possibly allosteric mechanisms.

==About this Structure==
1PHZ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Rattus_norvegicus Rattus norvegicus] with <scene name='pdbligand=FE:'>FE</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. The following page contains interesting information on the relation of 1PHZ with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb61_1.html Phenylalanine Hydroxylase]]. Active as [http://en.wikipedia.org/wiki/Phenylalanine_4-monooxygenase Phenylalanine 4-monooxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.14.16.1 1.14.16.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PHZ OCA]. 

==Reference==
Structural basis of autoregulation of phenylalanine hydroxylase., Kobe B, Jennings IG, House CM, Michell BJ, Goodwill KE, Santarsiero BD, Stevens RC, Cotton RG, Kemp BE, Nat Struct Biol. 1999 May;6(5):442-8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10331871 10331871]
[[Category: Phenylalanine 4-monooxygenase]]
[[Category: Phenylalanine Hydroxylase]]
[[Category: Rattus norvegicus]]
[[Category: Single protein]]
[[Category: Cotton, R G.]]
[[Category: House, C M.]]
[[Category: Jennings, I G.]]
[[Category: Kemp, B E.]]
[[Category: Kobe, B.]]
[[Category: Michell, B J.]]
[[Category: FE]]
[[Category: allosteric regulation]]
[[Category: aromatic amino acid hydroxylase]]
[[Category: intrasteric regulation]]
[[Category: phenylalanine hydroxylase]]
[[Category: phosphorylation]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:28:58 2008''