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- W3100779000 abstract "Abstract 3‐Methylglutaconic (3MGC) aciduria is a common phenotypic feature of a growing number of inborn errors of metabolism. “Primary” 3MGC aciduria is caused by deficiencies in leucine pathway enzymes while “secondary” 3MGC aciduria results from inborn errors of metabolism that impact mitochondrial energy production. The metabolic precursor of 3MGC acid is trans ‐3MGC CoA, an intermediate in the leucine catabolism pathway. Gas chromatography‐mass spectrometry (GC‐MS) analysis of commercially available trans ‐3MGC acid yielded a mixture of cis and trans isomers while 1 H‐NMR spectroscopy of trans ‐3MGC acid at 25°C provided no evidence for the cis isomer. When trans ‐3MGC acid was incubated under conditions used for sample derivatization prior to GC‐MS (but with no trimethylsilane added), 1 H‐NMR spectroscopy provided evidence of trans to cis isomerization. Incubation of trans ‐3MGC acid at 37°C resulted in time‐dependent isomerization to cis ‐3MGC acid. Cis ‐3MGC acid behaved in a similar manner except that, under identical incubation conditions, less isomerization occurred. In agreement with these experimental results, molecular modeling studies provided evidence that the energy minimized structure of cis ‐3MGC acid is 4 kJ/mol more stable than that for trans ‐3MGC acid. Once generated in vivo, trans ‐3MGC acid is proposed to isomerize via a mechanism involving π electron delocalization with formation of a resonance structure that permits bond rotation. The data presented are consistent with the occurrence of both diastereomers in urine samples of subjects with 3MGC aciduria." @default.
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- W3100779000 date "2020-11-11" @default.
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- W3100779000 title "Isomerization of <i>trans</i> ‐3‐methylglutaconic acid" @default.
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- W3100779000 doi "https://doi.org/10.1002/jmd2.12185" @default.
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