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2phm

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{{STRUCTURE_2phm| PDB=2phm | SCENE= }}
{{STRUCTURE_2phm| PDB=2phm | SCENE= }}
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'''STRUCTURE OF PHENYLALANINE HYDROXYLASE DEPHOSPHORYLATED'''
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===STRUCTURE OF PHENYLALANINE HYDROXYLASE DEPHOSPHORYLATED===
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==Overview==
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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.
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{{ABSTRACT_PUBMED_10331871}}
==About this Structure==
==About this Structure==
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[[Category: Phenylalanine hydroxylase]]
[[Category: Phenylalanine hydroxylase]]
[[Category: Phosphorylation]]
[[Category: Phosphorylation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 13:07:43 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:55:08 2008''

Revision as of 10:55, 29 July 2008

Image:2phm.png

Template:STRUCTURE 2phm

STRUCTURE OF PHENYLALANINE HYDROXYLASE DEPHOSPHORYLATED

Template:ABSTRACT PUBMED 10331871

About this Structure

2PHM is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from 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:10331871

Page seeded by OCA on Tue Jul 29 13:55:08 2008

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