| Structural highlights
Disease
[PH4H_HUMAN] Defects in PAH are the cause of phenylketonuria (PKU) [MIM:261600]. PKU is an autosomal recessive inborn error of phenylalanine metabolism, due to severe phenylalanine hydroxylase deficiency. It is characterized by blood concentrations of phenylalanine persistently above 1200 mumol (normal concentration 100 mumol) which usually causes mental retardation (unless low phenylalanine diet is introduced early in life). They tend to have light pigmentation, rashes similar to eczema, epilepsy, extreme hyperactivity, psychotic states and an unpleasant 'mousy' odor.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] Defects in PAH are the cause of non-phenylketonuria hyperphenylalaninemia (Non-PKU HPA) [MIM:261600]. Non-PKU HPA is a mild form of phenylalanine hydroxylase deficiency characterized by phenylalanine levels persistently below 600 mumol, which allows normal intellectual and behavioral development without treatment. Non-PKU HPA is usually caused by the combined effect of a mild hyperphenylalaninemia mutation and a severe one. Defects in PAH are the cause of hyperphenylalaninemia (HPA) [MIM:261600]. HPA is the mildest form of phenylalanine hydroxylase deficiency.[39] [40] [41] [42] [43] [44] [45] [46]
Publication Abstract from PubMed
Dysfunction of human phenylalanine hydroxylase (hPAH, EC 1.14.16.1) is the primary cause of phenylketonuria, the most common inborn error of amino acid metabolism. The dynamic domain rearrangements of this multimeric protein have thwarted structural study of the full-length form for decades, until now. In this study, a tractable C29S variant of hPAH (C29S) yielded a 3.06 A resolution crystal structure of the tetrameric resting-state conformation. We used size-exclusion chromatography in line with small-angle X-ray scattering (SEC-SAXS) to analyze the full-length hPAH solution structure both in the presence and absence of Phe, which serves as both substrate and allosteric activator. Allosteric Phe binding favors accumulation of an activated PAH tetramer conformation, which is biophysically distinct in solution. Protein characterization with enzyme kinetics and intrinsic fluorescence revealed that the C29S variant and hPAH are otherwise equivalent in their response to Phe, further supported by their behavior on various chromatography resins and by analytical ultracentrifugation (AUC). Modeling of resting-state and activated forms of C29S against SAXS data with available structural data created and evaluated several new models for the transition between the architecturally distinct conformations of PAH and highlighted unique intra- and inter-subunit interactions. Three best-fitting alternate models all placed the allosteric Phe-binding module 8-10 A farther from the tetramer center than do all previous models. The structural insights into allosteric activation of hPAH reported here may help inform ongoing efforts to treat phenylketonuria with novel therapeutic approaches.
Biophysical characterization of full-length human phenylalanine hydroxylase provides a deeper understanding of its quaternary structure equilibrium.,Arturo EC, Gupta K, Hansen MR, Borne E, Jaffe EK J Biol Chem. 2019 May 10. pii: RA119.008294. doi: 10.1074/jbc.RA119.008294. PMID:31076506[47]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
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- ↑ Bosco P, Cali F, Meli C, Mollica F, Zammarchi E, Cerone R, Vanni C, Palillo L, Greco D, Romano V. Eight new mutations of the phenylalanine hydroxylase gene in Italian patients with hyperphenylalaninemia. Hum Mutat. 1998;11(3):240-3. PMID:9521426 doi:<240::AID-HUMU9>3.0.CO;2-L 10.1002/(SICI)1098-1004(1998)11:3<240::AID-HUMU9>3.0.CO;2-L
- ↑ Yang Y, Drummond-Borg M, Garcia-Heras J. Molecular analysis of phenylketonuria (PKU) in newborns from Texas. Hum Mutat. 2001 Jun;17(6):523. PMID:11385716 doi:10.1002/humu.1141
- ↑ Muntau AC, Roschinger W, Habich M, Demmelmair H, Hoffmann B, Sommerhoff CP, Roscher AA. Tetrahydrobiopterin as an alternative treatment for mild phenylketonuria. N Engl J Med. 2002 Dec 26;347(26):2122-32. PMID:12501224 doi:10.1056/NEJMoa021654
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- ↑ Abadie V, Jaruzelska J, Lyonnet S, Millasseau P, Berthelon M, Rey F, Munnich A, Rey J. Illegitimate transcription of the phenylalanine hydroxylase gene in lymphocytes for identification of mutations in phenylketonuria. Hum Mol Genet. 1993 Jan;2(1):31-4. PMID:8098245
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- ↑ Chen KJ, Chao HK, Hsiao KJ, Su TS. Identification and characterization of a novel liver-specific enhancer of the human phenylalanine hydroxylase gene. Hum Genet. 2002 Mar;110(3):235-43. Epub 2002 Feb 5. PMID:11935335 doi:10.1007/s00439-002-0677-7
- ↑ Arturo EC, Gupta K, Hansen MR, Borne E, Jaffe EK. Biophysical characterization of full-length human phenylalanine hydroxylase provides a deeper understanding of its quaternary structure equilibrium. J Biol Chem. 2019 May 10. pii: RA119.008294. doi: 10.1074/jbc.RA119.008294. PMID:31076506 doi:http://dx.doi.org/10.1074/jbc.RA119.008294
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