Serine one-carbon catabolism with formate overflow.

Serine one-carbon catabolism with formate overflow.
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DOI:
10.1126/sciadv.1601273
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发表时间:
2016-10
期刊:
影响因子:
13.6
通讯作者:
Vazquez A
Vazquez A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Meiser J;Tumanov S;Maddocks O;Labuschagne CF;Athineos D;Van Den Broek N;Mackay GM;Gottlieb E;Blyth K;Vousden K;Kamphorst JJ;Vazquez A

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Serine catabolism results in formate efflux that exceeds anabolic demands for purine synthesis. Serine catabolism to glycine and a one-carbon unit has been linked to the anabolic requirements of proliferating mammalian cells. However, genome-scale modeling predicts a catabolic role with one-carbon release as formate. We experimentally prove that in cultured cancer cells and nontransformed fibroblasts, most of the serine-derived one-carbon units are released from cells as formate, and that formate release is dependent on mitochondrial reverse 10-CHO-THF synthetase activity. We also show that in cancer cells, formate release is coupled to mitochondrial complex I activity, whereas in nontransformed fibroblasts, it is partially insensitive to inhibition of complex I activity. We demonstrate that in mice, about 50% of plasma formate is derived from serine and that serine starvation or complex I inhibition reduces formate synthesis in vivo. These observations transform our understanding of one-carbon metabolism and have implications for the treatment of diabetes and cancer with complex I inhibitors.
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