The solution structure of the regulatory domain of tyrosine hydroxylase

Shengnan Zhang, Tao Huang, Udayar Ilangovan, Andrew P. Hinck, Paul F. Fitzpatrick

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Tyrosine hydroxylase (TyrH) catalyzes the hydroxylation of tyrosine to form 3,4-dihydroxyphenylalanine in the biosynthesis of the catecholamine neurotransmitters. The activity of the enzyme is regulated by phosphorylation of serine residues in a regulatory domain and by binding of catecholamines to the active site. Available structures of TyrH lack the regulatory domain, limiting the understanding of the effect of regulation on structure. We report the use of NMR spectroscopy to analyze the solution structure of the isolated regulatory domain of rat TyrH. The protein is composed of a largely unstructured N-terminal region (residues 1-71) and a well-folded C-terminal portion (residues 72-159). The structure of a truncated version of the regulatory domain containing residues 65-159 has been determined and establishes that it is an ACT domain. The isolated domain is a homodimer in solution, with the structure of each monomer very similar to that of the core of the regulatory domain of phenylalanine hydroxylase. Two TyrH regulatory domain monomers form an ACT domain dimer composed of a sheet of eight strands with four α-helices on one side of the sheet. Backbone dynamic analyses were carried out to characterize the conformational flexibility of TyrH65-159. The results provide molecular details critical for understanding the regulatory mechanism of TyrH.

Original languageEnglish (US)
Pages (from-to)1483-1497
Number of pages15
JournalJournal of Molecular Biology
Volume426
Issue number7
DOIs
StatePublished - Apr 3 2014

Keywords

  • ACT domain
  • NMR spectroscopy
  • regulation
  • solution structure
  • tyrosine hydroxylase

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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