Cited by 53Ubiquitin and proteasome pathwaysAutophagy in Disease and TherapyProtein Degradation and Inhibitors

Ubiquitination of soluble and membrane-bound tyrosine hydroxylase and degradation of the soluble form

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Døskeland, Anne P., Flatmark, Torgeir·2002·European Journal of Biochemistry

Abstract

Tyrosine hydroxylase (TH) demonstrates by two‐dimensional electrophoresis a microheterogeneity both as a soluble recombinant human TH (hTH1) and as a membrane‐bound bovine TH (bTH mem). Part of the heterogeneity is likely due to deamidation of labile asparagine residues. Wild‐type (wt)‐hTH1 was found to be a substrate for the ubiquitin (Ub) conjugating enzyme system in a reconstituted in vitro system. When wt‐hTH1 was expressed in a coupled transcription‐translation TnT R‐T7 reticulolysate system 35 S‐labelled polypeptides of the expected molecular mass of native enzyme as well as both higher and lower molecular mass forms were observed. The amount of high‐molecular‐mass forms increased by time and was enhanced in the presence of Ub and clasto‐lactacystin β‐lactone. In pulse‐chase experiments the amount of full‐length hTH1 decreased by first‐order kinetics with a half‐time of 7.4 h and 2.1 h in the absence and presence of an ATP‐regenerating system, respectively. The ATP‐dependent degradation was inhibited by clasto‐lactacystin β‐lactone. Our findings support the conclusion that hTH1 is ubiquitinated and at least partially degraded by the proteasomes in the reticulocyte lysate system. Finally, it is shown that the integral TH of the bovine␣adrenal chromaffin granule membrane (bTH mem) is ubiquitinated, most likely monoubiquitinated. Additional Ub‐conjugates of this membrane, detected by Western blot analysis, have not yet been identified.

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Crossref · 10.1046/j.1432-1033.2002.02808.x

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Authors
Døskeland, A. P., & Flatmark, T.
Affiliations
University of Bergen (NO)
Venue
European Journal of Biochemistry
Publisher
Wiley
Published
2002-03
Volume
269
Issue
5
Pages
1561-1569
ISSN
  • 0014-2956 (ISSN-L)
  • 1432-1033
OpenAlex
W1917032649
Cited by
53
References
55
Citations by year
2025: 1 · 2023: 3 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 1 · 2016: 3 · 2015: 2 · 2014: 2 · 2013: 4 · 2012: 3
FWCI
1.04
Type
journal article
Language
en
Open access
Locations
  • European Journal of Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
Keywords
tyrosine hydroxylase, ubiquitination, protein degradation, proteasome, asparagine deamidation, protein microheterogeneity, membrane-bound enzyme, chromaffin granule membrane, clasto-lactacystin beta-lactone, E2 ubiquitin-conjugating enzyme
MeSH terms
Adenosine Triphosphate, Animals, Cattle, Chromaffin Granules, Membrane Proteins, Recombinant Proteins, Reticulocytes, Tyrosine 3-Monooxygenase, Electrophoresis, Gel, Two-Dimensional, Ubiquitin, Mice

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