Abstract
Peroxisomal biogenesis disorders include Zellweger syndrome and milder phenotypes, such as neonatal adrenoleukodystrophy (NALD). Our previous study of a NALD patient with a marked deterioration by a fever revealed a mutation (Ile326Thr) within a SH3 domain of PEX13 protein (Pex13p), showing a temperature-sensitive (TS) phenotype in peroxisomal biogenesis. Clinical TS phenotypes also have been reported in several genetic diseases, but the molecular mechanisms still remain to be clarified. The immunofluorescent staining with anti-Pex13p antibody also revealed TS phenotype of the I326T mutant protein itself in the patient cells. Protease digestion of the recombinant Pex13p-SH3 domain showed an increase of protease susceptibility, suggesting a problem of mutant protein fold. Conformational analyses against urea denaturation using urea gradient gel electrophoresis or fluorescence emission from tryptophan residue revealed that the mutant protein should be easily unfolded. Far-UV circular dichroism (CD) spectra demonstrated that both wild-type and the mutant protein have antiparallel beta-sheets as their secondary structure with slightly different extent. The thermal unfolding profiles measured by CD showed a marked lower melting temperature for I326T protein compared with that of wild-type protein. Analysis of the protein 3D-structure indicated that the Ile326 should be a core residue for folding kinetics and the substitution of Ile326 by threonine should directly alter the kinetic equilibrium, suggesting a marked increase of the unfolded molecules when the patient had a high fever. Structural analyses of the protein in the other genetic diseases could provide an avenue for better understanding of genotype-phenotype correlations.
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Abbreviations
- AOX:
-
peroxisomal acyl-CoA oxidase
- CD:
-
circular dichroism
- DBP:
-
D-bifunctional protein
- GST:
-
glutathione-S-transferase
- NALD:
-
neonatal adrenoleukodystrophy
- PBD:
-
peroxisomal biogenesis disorder
- Pex:
-
Peroxin
- SH3:
-
src-homology 3
- TS:
-
temperature-sensitive
- TUG:
-
transverse urea gradient
- ZS:
-
Zellweger syndrome
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Acknowledgements
The authors thank M. Komori for providing anti-Pex13p antibody and N. Usuda for anti-AOX and DBP antibodies. We also thank Y. Yatsuda, A. Seki, S. Shimizu, Y. Kondo, M. Kojima, and K. Kasahara for their assistance.
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Supported, in part, by a grant-in-aid for Scientific Research (13670791) from the Japan Society for the Promotion of Science, by a grant for Child Health and Development (14C-3) from the Ministry of Health, Labour and Welfare, by the Uehara Memorial Foundation, and by the Naito Foundation.
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Hashimoto, K., Kato, Z., Nagase, T. et al. Molecular Mechanism of a Temperature-Sensitive Phenotype in Peroxisomal Biogenesis Disorder. Pediatr Res 58, 263–269 (2005). https://doi.org/10.1203/01.PDR.0000169984.89199.69
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DOI: https://doi.org/10.1203/01.PDR.0000169984.89199.69
