Cited by 15Metabolism and Genetic DisordersLysosomal Storage Disorders ResearchDrug Transport and Resistance Mechanisms

Functional characterization of the adrenoleukodystrophy protein (ALDP) and disease pathogenesis

Gärtner, J., Dehmel, T., Klusmann, A., Roerig, P.·2002·Endocrine Research

Abstract

X-linked adrenoleukodystrophy (X-ALD) is the most common peroxisomal disorder characterized by abnormal accumulation of saturated very long chain fatty acids in tissues and body fluids with predominance in brain white matter and adrenal cortex. The clinical phenotype is highly variable ranging from the severe childhood cerebral form to asymptomatic persons. The responsible ALD gene encodes the adrenoleukodystrophy protein (ALDP), a peroxisomal integral membrane protein that is a member of the ATP-binding cassette (ABC) transporter protein family. The patient gene mutations are heterogeneously distributed over the functional domains of ALDP. The extreme variability in clinical phenotype, even within one affected family, indicates that besides the ALD gene mutations other factors strongly influence the clinical phenotype. To understand the cell biology and function of mammalian peroxisomal ABC transporters and to determine their role in the pathogenesis of X-ALD we developed a system for expressing functional ABC protein domains in fusion with the maltose binding protein. Wild type and mutant fusion proteins of the nucleotide-binding fold were overexpressed, purified, and characterized by photoaffinity labeling with 8-azido ATP or 8-azido GTP and a coupled ATP regenerating enzyme assay for ATPase activity. Our studies provide evidence that peroxisomal ABC transporters utilize ATP to become a functional transporter and that ALD gene mutations alter peroxisomal transport function. The established disease model will be used further to study the influence of possible disease modifier proteins on ALDP function.

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Crossref · 10.1081/erc-120016999

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Research works printed but not linked: 2

  1. Moser H. W., 2001, The Metabolic and Molecular Bases of Inherited Disease, 3257
  2. Roerig P., 2001, FEBS Lett., 24674, 1

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Authors
Gärtner, J., Dehmel, T., Klusmann, A., & Roerig, P.
Affiliations
Heinrich Heine University Düsseldorf (DE)
Venue
Endocrine Research
Published
2002-01
Volume
28
Issue
4
Pages
741-748
ISSN
  • 0743-5800 (ISSN-L)
  • 1532-4206
OpenAlex
W1986966017
Cited by
15
References
20
Citations by year
2023: 1 · 2022: 1 · 2021: 2 · 2017: 1 · 2012: 1
FWCI
1.08
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrine Research (publishedVersion)
  • PubMed (publishedVersion)
  • GRO (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Clinical Biochemistry › Metabolism and Genetic Disorders
  • Health Sciences › Medicine › Physiology › Lysosomal Storage Disorders Research
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
X-linked adrenoleukodystrophy, ALDP, ABC transporters, peroxisomes, very long chain fatty acids, ATPase activity, nucleotide binding fold, pathogenesis, genotype-phenotype variability, disease modifiers, photoaffinity labeling
MeSH terms
ATP Binding Cassette Transporter, Subfamily D, Member 1, Adenosine Triphosphate, Adrenoleukodystrophy, Humans, Genetic Linkage, Mutation, Phenotype, Protein Folding, ATP-Binding Cassette Transporters, Peroxisomes, Chromosomes, Human, X

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