Computational analysis of a novel mutation in ETFDH gene highlights its long-range effects on the FAD-binding motif View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2011-10-21

AUTHORS

Tze-Kiong Er, Chih-Chieh Chen, Yen-Yi Liu, Hui-Chiu Chang, Yin-Hsiu Chien, Jan-Gowth Chang, Jenn-Kang Hwang, Yuh-Jyh Jong

ABSTRACT

BACKGROUND: Multiple acyl-coenzyme A dehydrogenase deficiency (MADD) is an autosomal recessive disease caused by the defects in the mitochondrial electron transfer system and the metabolism of fatty acids. Recently, mutations in electron transfer flavoprotein dehydrogenase (ETFDH) gene, encoding electron transfer flavoprotein:ubiquinone oxidoreductase (ETF:QO) have been reported to be the major causes of riboflavin-responsive MADD. To date, no studies have been performed to explore the functional impact of these mutations or their mechanism of disrupting enzyme activity. RESULTS: High resolution melting (HRM) analysis and sequencing of the entire ETFDH gene revealed a novel mutation (p.Phe128Ser) and the hotspot mutation (p.Ala84Thr) from a patient with MADD. According to the predicted 3D structure of ETF:QO, the two mutations are located within the flavin adenine dinucleotide (FAD) binding domain; however, the two residues do not have direct interactions with the FAD ligand. Using molecular dynamics (MD) simulations and normal mode analysis (NMA), we found that the p.Ala84Thr and p.Phe128Ser mutations are most likely to alter the protein structure near the FAD binding site as well as disrupt the stability of the FAD binding required for the activation of ETF:QO. Intriguingly, NMA revealed that several reported disease-causing mutations in the ETF:QO protein show highly correlated motions with the FAD-binding site. CONCLUSIONS: Based on the present findings, we conclude that the changes made to the amino acids in ETF:QO are likely to influence the FAD-binding stability. More... »

PAGES

43-43

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1472-6807-11-43

DOI

http://dx.doi.org/10.1186/1472-6807-11-43

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047419888

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22013910


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