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• W2127116298 endingPage "2652" @default.
• W2127116298 startingPage "2647" @default.
• W2127116298 abstract "Glycine plays several roles in human metabolism, e.g. as a 1-carbon donor, in purine synthesis, and as a component of glutathione. Glycine is decarboxylated via the glycine cleavage system (GCS) that yields concurrent generation of a 1-carbon unit as 5,10-methylenetetrahydrofolate (methyleneTHF). Serine hydroxymethyltransferase (SHMT) catalyzes the interconversion of glycine and serine, another 1-carbon donor. The quantitative role of glycine in human 1-carbon metabolism has received little attention. The aim of this protocol was to quantify whole body glycine flux, glycine to serine flux, and rate of glycine cleavage in humans. A primed, constant infusion with 9.26 micromol x kg(-1) x h(-1) [1,2-(13)C2]glycine and 1.87 micromol x kg(-1) x h(-1) [(2)H3]leucine was used to quantify the kinetic behavior of glycine in young, healthy volunteers (n = 5) in a fed state. The isotopic enrichment of infused tracers and metabolic products in plasma, as well as breath (13)CO2 enrichment, were determined for use in kinetic analysis. Serine synthesis by direct conversion from glycine via SHMT occurred at 193 +/- 28 micromol x kg(-1) x h(-1) (mean +/- SEM), which comprised 41% of the 463 +/- 55 micromol x kg(-1) x h(-1) total glycine flux. Nearly one-half (46%) of the glycine-to-serine conversion occurred using GCS-derived methyleneTHF 1-carbon units. Based on breath (13)CO2 measurement, glycine decarboxylation (190 +/- 41 micromol x kg(-1) x h(-1)) accounted for 39 +/- 6% of whole body glycine flux. This study is the first to our knowledge to quantify human glycine cleavage and glycine-to-serine SHMT kinetics. GCS is responsible for a substantial proportion of whole body glycine flux and constitutes a major route for the generation of 1-carbon units." @default.
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• W2127116298 date "2007-12-01" @default.
• W2127116298 modified "2023-10-17" @default.
• W2127116298 title "Glycine Turnover and Decarboxylation Rate Quantified in Healthy Men and Women Using Primed, Constant Infusions of [1,2-13C2]Glycine and [2H3]Leucine ," @default.
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• W2127116298 doi "https://doi.org/10.1093/jn/137.12.2647" @default.
• W2127116298 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5833992" @default.
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