Scholarlink

<p>All organisms have thioredoxin reductase (TR) or glutathione reductase (GR), the only enzymes that use reduced nicotinamide adenine dinucleotide phosphate to reduce cytosolic disulfides into thiols, thereby powering deoxyribonucleotide biosynthesis, elimination of oxidants, oxidative damage repair and reduction of the disulfide nutrient cystine into the thiol amino acid cysteine. Hence, TR/GR-null bacteria or yeast are inviable; yet, remarkably, mice with TR/GR-null livers thrive, in part by synthesizing life-sustaining cysteine through alternative pathways that evolved in metazoans. Although TR/GR-null livers generate some of their cysteine through the serine transsulfuration pathway, we here show that most cysteine in TR/GR-null livers comes from a pathway in which pyridoxal-phosphate-dependent cleavage of a carbon–sulfur bond in cystine generates cysteine persulfide, which decomposes nonenzymatically into cysteine. This potent yet previously unrecognized pathway is regulated by cellular levels of sulfur metabolites and represents a potent cytoprotective response that might be induced in most mammalian cells under conditions that chronically elevate cytosolic cystine levels.</p><p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Cystine C–S bond cleavage fuels cysteine production under disulfide reductase deficiency

  • 期刊论文

  • 发表日期：

    2026年5月21日

查看全文
  • Edward E. Schmidt,
  • Eszter Petra Jurányi,
  • Colin G. Miller,
  • Sydney A. Austad,
  • Tamás Ditrói,
  • Zoe M. Seaford,
  • Sang Jun Yoon,
  • Reed C. Noyd,
  • Yun Pyo Kang,
  • Justin R. Prigge,
  • Vivien Csikós,
  • Martina Serrano Alvarez,
  • Katalin Erdélyi,
  • Dóra Kővári,
  • Gina M. DeNicola,
  • Peter Nagy

摘要

All organisms have thioredoxin reductase (TR) or glutathione reductase (GR), the only enzymes that use reduced nicotinamide adenine dinucleotide phosphate to reduce cytosolic disulfides into thiols, thereby powering deoxyribonucleotide biosynthesis, elimination of oxidants, oxidative damage repair and reduction of the disulfide nutrient cystine into the thiol amino acid cysteine. Hence, TR/GR-null bacteria or yeast are inviable; yet, remarkably, mice with TR/GR-null livers thrive, in part by synthesizing life-sustaining cysteine through alternative pathways that evolved in metazoans. Although TR/GR-null livers generate some of their cysteine through the serine transsulfuration pathway, we here show that most cysteine in TR/GR-null livers comes from a pathway in which pyridoxal-phosphate-dependent cleavage of a carbon–sulfur bond in cystine generates cysteine persulfide, which decomposes nonenzymatically into cysteine. This potent yet previously unrecognized pathway is regulated by cellular levels of sulfur metabolites and represents a potent cytoprotective response that might be induced in most mammalian cells under conditions that chronically elevate cytosolic cystine levels.