Novel pharmacological chaperones that correct phenylketonuria in mice
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Novel pharmacological chaperones that correct phenylketonuria in mice. / Santos-Sierra, Sandra; Kirchmair, Johannes; Perna, Anna M; Reiss, Dunja; Kemter, Kristina; Röschinger, Wulf; Glossmann, Hartmut; Gersting, Søren W; Muntau, Ania C; Wolber, Gerhard; Lagler, Florian B.
in: HUM MOL GENET, Jahrgang 21, Nr. 8, 15.04.2012, S. 1877-87.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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T1 - Novel pharmacological chaperones that correct phenylketonuria in mice
AU - Santos-Sierra, Sandra
AU - Kirchmair, Johannes
AU - Perna, Anna M
AU - Reiss, Dunja
AU - Kemter, Kristina
AU - Röschinger, Wulf
AU - Glossmann, Hartmut
AU - Gersting, Søren W
AU - Muntau, Ania C
AU - Wolber, Gerhard
AU - Lagler, Florian B
PY - 2012/4/15
Y1 - 2012/4/15
N2 - Phenylketonuria (PKU) is caused by inherited phenylalanine-hydroxylase (PAH) deficiency and, in many genotypes, it is associated with protein misfolding. The natural cofactor of PAH, tetrahydrobiopterin (BH(4)), can act as a pharmacological chaperone (PC) that rescues enzyme function. However, BH(4) shows limited efficacy in some PKU genotypes and its chemical synthesis is very costly. Taking an integrated drug discovery approach which has not been applied to this target before, we identified alternative PCs for the treatment of PKU. Shape-focused virtual screening of the National Cancer Institute's chemical library identified 84 candidate molecules with potential to bind to the active site of PAH. An in vitro evaluation of these yielded six compounds that restored the enzymatic activity of the unstable PAHV106A variant and increased its stability in cell-based assays against proteolytic degradation. During a 3-day treatment study, two compounds (benzylhydantoin and 6-amino-5-(benzylamino)-uracil) substantially improved the in vivo Phe oxidation and blood Phe concentrations of PKU mice (Pah(enu1)). Notably, benzylhydantoin was twice as effective as tetrahydrobiopterin. In conclusion, we identified two PCs with high in vivo efficacy that may be further developed into a more effective drug treatment of PKU.
AB - Phenylketonuria (PKU) is caused by inherited phenylalanine-hydroxylase (PAH) deficiency and, in many genotypes, it is associated with protein misfolding. The natural cofactor of PAH, tetrahydrobiopterin (BH(4)), can act as a pharmacological chaperone (PC) that rescues enzyme function. However, BH(4) shows limited efficacy in some PKU genotypes and its chemical synthesis is very costly. Taking an integrated drug discovery approach which has not been applied to this target before, we identified alternative PCs for the treatment of PKU. Shape-focused virtual screening of the National Cancer Institute's chemical library identified 84 candidate molecules with potential to bind to the active site of PAH. An in vitro evaluation of these yielded six compounds that restored the enzymatic activity of the unstable PAHV106A variant and increased its stability in cell-based assays against proteolytic degradation. During a 3-day treatment study, two compounds (benzylhydantoin and 6-amino-5-(benzylamino)-uracil) substantially improved the in vivo Phe oxidation and blood Phe concentrations of PKU mice (Pah(enu1)). Notably, benzylhydantoin was twice as effective as tetrahydrobiopterin. In conclusion, we identified two PCs with high in vivo efficacy that may be further developed into a more effective drug treatment of PKU.
KW - Animals
KW - Binding Sites
KW - Biopterin
KW - Catalytic Domain
KW - Cell Line, Tumor
KW - Cell Survival
KW - Drug Discovery
KW - Drug Evaluation, Preclinical
KW - Enzyme Stability
KW - Humans
KW - Hydantoins
KW - Mice
KW - Oxidation-Reduction
KW - Phenylalanine
KW - Phenylalanine Hydroxylase
KW - Phenylketonurias
KW - Protein Folding
KW - Small Molecule Libraries
KW - Uracil
U2 - 10.1093/hmg/dds001
DO - 10.1093/hmg/dds001
M3 - SCORING: Journal article
C2 - 22246293
VL - 21
SP - 1877
EP - 1887
JO - HUM MOL GENET
JF - HUM MOL GENET
SN - 0964-6906
IS - 8
ER -