Recessively inherited L-DOPA-responsive dystonia caused by a point mutation (Q381K) in the tyrosine hydroxylase gene.

Abstract:

:Tyrosine hydroxylase (TH) catalyzes the conversion of L-tyrosine to L-dihydroxyphenylalanine (L-DOPA), the rate-limiting step in the biosynthesis of dopamine. Recently, we described a point mutation in hTH (Q381K) in a family of two siblings suffering from progressive L-DOPA-responsive dystonia (DRD), representing the first reported mutation in this gene. We here describe the cloning, expression and steady-state kinetic properties of the recombinant mutant enzyme. When expressed by a coupled in vitro transcription-translation system and in E. coli, the mutant enzyme represents a kinetic variant form, with a reduced affinity for L-tyrosine. The 'residual activity' of about 15% of the corresponding wild-type hTH (isoform hTH1), at substrate concentrations prevailing in vivo, is compatible with the clinical phenotype of the two Q381K homozygote patients carrying this recessively inherited mutation.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Knappskog PM,Flatmark T,Mallet J,Lüdecke B,Bartholomé K

doi

10.1093/hmg/4.7.1209

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

1209-12

issue

7

eissn

0964-6906

issn

1460-2083

journal_volume

4

pub_type

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