Secondary BH4 deficiency links protein homeostasis to regulation of phenylalanine metabolism.

Abstract:

:Metabolic control of phenylalanine concentrations in body fluids is essential for cognitive development and executive function. The hepatic phenylalanine hydroxylating system is regulated by the ratio of l-phenylalanine, which is substrate of phenylalanine hydroxylase (PAH), to the PAH cofactor tetrahydrobiopterin (BH4). Physiologically, phenylalanine availability is governed by nutrient intake, whereas liver BH4 is kept at constant level. In phenylketonuria, PAH deficiency leads to elevated blood phenylalanine and is often caused by PAH protein misfolding with loss of function. Here, we report secondary hepatic BH4 deficiency in Pah-deficient mice. Alterations in de novo synthesis and turnover of BH4 were ruled out as molecular causes. We demonstrate that kinetically instable and aggregation-prone variant Pah proteins trap BH4, shifting the pool of free BH4 towards bound BH4. Interference of PAH protein misfolding with metabolite-based control of l-phenylalanine turnover suggests a mechanistic link between perturbation of protein homeostasis and disturbed regulation of metabolic pathways.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Eichinger A,Danecka MK,Möglich T,Borsch J,Woidy M,Büttner L,Muntau AC,Gersting SW

doi

10.1093/hmg/ddy079

subject

Has Abstract

pub_date

2018-05-15 00:00:00

pages

1732-1742

issue

10

eissn

0964-6906

issn

1460-2083

pii

4921283

journal_volume

27

pub_type

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