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- W2081412228 abstract "Maple syrup urine disease (MSUD) is an autosomal recessive metabolic disorder that is caused by mutations in the subunits of the branched-chain α-ketoacid dehydrogenase (BCKD) complex. BCKD is a mitochondrial complex encoded by four nuclear genes (BCKDHA, BCKDHB, DBT, and DLD) and is involved in the metabolism of branched-chain amino acids (BCAAs). In this study, we investigated the DNA sequences of BCKDHA, BCKDHB and DBT genes for mutations in a Chinese newborn with the classic form of MSUD and predicted the associated conformational changes using molecular modeling. We identified two previously unreported mutations in the BCKDHB gene, R170H (c.509G>A) in exon 5 and Q346R (c.1037 A>G) in exon 9. In silico analysis of the two novel missense mutations revealed that the mutation R170H-β alters the spatial orientation with both Y195-β' and S206-α, which results in unstable β-β' assembly and an unstable K(+) ion binding loop of the α subunit, respectively; The Q346R mutation is predicted to disrupt the spatial conformation between Q346-β and I357-β', which reduces the affinity of the β-β' subunits. These results indicate that R170-β and Q346-β are crucial for the activity of the E1 component. These two novel mutations, R170H and Q346R result in the patient's clinical manifestation of the classic form of MSUD." @default.
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- W2081412228 date "2012-04-01" @default.
- W2081412228 modified "2023-09-23" @default.
- W2081412228 title "Two novel mutations in the BCKDHB gene (R170H, Q346R) cause the classic form of maple syrup urine disease (MSUD)" @default.
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- W2081412228 doi "https://doi.org/10.1016/j.gene.2012.01.082" @default.
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