2pah: Difference between revisions

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[[Image:2pah.~~gif~~|left|200px]]

[[Image:2pah.png|left|200px]]

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~~==Overview==~~

Phenylalanine hydroxylase (PheOH) catalyzes the conversion of L-phenylalanine to L-tyrosine, the rate-limiting step in the oxidative degradation of phenylalanine. Mutations in the human PheOH gene cause phenylketonuria, a common autosomal recessive metabolic disorder that in untreated patients often results in varying degrees of mental retardation. We have determined the crystal structure of human PheOH (residues 118-452). The enzyme crystallizes as a tetramer with each monomer consisting of a catalytic and a tetramerization domain. The tetramerization domain is characterized by the presence of a domain swapping arm that interacts with the other monomers forming an antiparallel coiled-coil. The structure is the first report of a tetrameric PheOH and displays an overall architecture similar to that of the functionally related tyrosine hydroxylase. In contrast to the tyrosine hydroxylase tetramer structure, a very pronounced asymmetry is observed in the phenylalanine hydroxylase, caused by the occurrence of two alternate conformations in the hinge region that leads to the coiled-coil helix. Examination of the mutations causing PKU shows that some of the most frequent mutations are located at the interface of the catalytic and tetramerization domains. Their effects on the structural and cellular stability of the enzyme are discussed.

==About this Structure==

2PAH is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The following page contains interesting information on the relation of 2PAH with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb61_1.html Phenylalanine Hydroxylase]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PAH OCA].

~~==Reference==~~

Structure of tetrameric human phenylalanine hydroxylase and its implications for phenylketonuria., Fusetti F, Erlandsen H, Flatmark T, Stevens RC, J Biol Chem. 1998 Jul 3;273(27):16962-7. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9642259 9642259]

[[Category: Homo sapiens]]

[[Category: Phenylalanine 4-monooxygenase]]

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[[Category: Hydroxylase]]

[[Category: Phenylketonuria]]

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-[[Image:2pah.gif|left|200px]]
+[[Image:2pah.png|left|200px]]
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-==Overview==
+{{ABSTRACT_9642259}}
-Phenylalanine hydroxylase (PheOH) catalyzes the conversion of L-phenylalanine to L-tyrosine, the rate-limiting step in the oxidative degradation of phenylalanine. Mutations in the human PheOH gene cause phenylketonuria, a common autosomal recessive metabolic disorder that in untreated patients often results in varying degrees of mental retardation. We have determined the crystal structure of human PheOH (residues 118-452). The enzyme crystallizes as a tetramer with each monomer consisting of a catalytic and a tetramerization domain. The tetramerization domain is characterized by the presence of a domain swapping arm that interacts with the other monomers forming an antiparallel coiled-coil. The structure is the first report of a tetrameric PheOH and displays an overall architecture similar to that of the functionally related tyrosine hydroxylase. In contrast to the tyrosine hydroxylase tetramer structure, a very pronounced asymmetry is observed in the phenylalanine hydroxylase, caused by the occurrence of two alternate conformations in the hinge region that leads to the coiled-coil helix. Examination of the mutations causing PKU shows that some of the most frequent mutations are located at the interface of the catalytic and tetramerization domains. Their effects on the structural and cellular stability of the enzyme are discussed.
 ==About this Structure==
 PAH is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The following page contains interesting information on the relation of 2PAH with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb61_1.html Phenylalanine Hydroxylase]]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PAH OCA].
-==Reference==
-Structure of tetrameric human phenylalanine hydroxylase and its implications for phenylketonuria., Fusetti F, Erlandsen H, Flatmark T, Stevens RC, J Biol Chem. 1998 Jul 3;273(27):16962-7. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9642259 9642259]
 [[Category: Homo sapiens]]
 [[Category: Phenylalanine 4-monooxygenase]]
@@ Line 29: / Line 25: @@
 [[Category: Hydroxylase]]
 [[Category: Phenylketonuria]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 12:43:43 2008''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jun 26 18:21:12 2008''