Cited by 20Lipid Membrane Structure and BehaviorAlzheimer's disease research and treatmentsParkinson's Disease Mechanisms and Treatments

Tyrosine Hydroxylase Binding to Phospholipid Membranes Prompts Its Amyloid Aggregation and Compromises Bilayer Integrity

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Baumann, Anne, Jorge-Finnigan, Ana, Jung-KC, Kunwar, Sauter, Alexander, Horvath, Istvan, Morozova-Roche, Ludmilla A., Martinez, Aurora·2016·Scientific Reports

Abstract

Tyrosine hydroxylase (TH), a rate-limiting enzyme in the synthesis of catecholamine neurotransmitters and hormones, binds to negatively charged phospholipid membranes. Binding to both large and giant unilamellar vesicles causes membrane permeabilization, as observed by efflux and influx of fluorescence dyes. Whereas the initial protein-membrane interaction involves the N-terminal tail that constitutes an extension of the regulatory ACT-domain, prolonged membrane binding induces misfolding and self-oligomerization of TH over time as shown by circular dichroism and Thioflavin T fluorescence. The gradual amyloid-like aggregation likely occurs through cross-β interactions involving aggregation-prone motives in the catalytic domains, consistent with the formation of chain and ring-like protofilaments observed by atomic force microscopy in monolayer-bound TH. PC12 cells treated with the neurotoxin 6-hydroxydopamine displayed increased TH levels in the mitochondrial fraction, while incubation of isolated mitochondria with TH led to a decrease in the mitochondrial membrane potential. Furthermore, cell-substrate impedance and viability assays showed that supplementing the culture media with TH compromises cell viability over time. Our results revealed that the disruptive effect of TH on cell membranes may be a cytotoxic and pathogenic factor if the regulation and intracellular stability of TH is compromised.

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Authors
Baumann, A., Jorge-Finnigan, A., Jung-KC, K., Sauter, A., Horvath, I., Morozova-Roche, L. A., & Martinez, A.
Affiliations
  • Haukeland University Hospital (NO)
  • University of Bergen (NO)
Corresponding author
Baumann, Anne
Venue
Scientific Reports
Published
2016-12-22
Volume
6
Issue
1
Pages
39488-39488
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2567492961
Cited by
20
References
66
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 1
FWCI
1.04
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DiVA at Umeå University (Umeå University) (submittedVersion, other-oa)
Funders
  • Stiftelsen Kristian Gerhard Jebsen
  • Federation of European Biochemical Societies
  • Universitetet i Bergen
  • Norges Forskningsråd (299972)
  • Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Lipid Membrane Structure and Behavior
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
Keywords
tyrosine hydroxylase, protein-membrane binding, phospholipid membranes, amyloid fibril formation, self-oligomerization, membrane permeabilization, N-terminal tail, ACT domain, 6-hydroxydopamine, mitochondrial membrane potential, cytotoxicity, catecholamine synthesis, protein misfolding
MeSH terms
Amyloid, Animals, Cell Membrane, Cell Survival, Circular Dichroism, Flow Cytometry, Humans, Lipid Bilayers, Liposomes, Mitochondria, Molecular Conformation, Permeability, Phosphatidylcholines, Phospholipids, Subcellular Fractions, Thiazoles, Tyrosine 3-Monooxygenase, Gene Expression Regulation, Neoplastic, PC12 Cells, Microscopy, Confocal, Microscopy, Atomic Force, Catalytic Domain, Rats, Benzothiazoles, HEK293 Cells

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