The Journal of Cell Biology
Abstract
Amino acid catabolism is frequently executed in mitochondria; however, it is largely unknown how aberrant amino acid metabolism affects mitochondria. Here we report the requirement for mitochondrial saccharopine degradation in mitochondrial homeostasis and animal development. InCaenorhbditis elegans, mutations in the saccharopine dehydrogenase (SDH) domain of the bi-functional enzyme α-aminoadipic semialdehyde synthase AASS-1 greatly elevate the lysine catabolic intermediate saccharopine, which causes mitochondrial damage by disrupting mitochondrial dynamics, leading to reduced adult animal growth. In mice, failure of mitochondrial saccharopine oxidation causes lethal mitochondrial damage in the liver, leading to postnatal developmental retardation and death. Importantly, genetic inactivation of genes that raise the mitochondrial saccharopine precursors lysine and α-ketoglutarate strongly suppresses SDH mutation-induced saccharopine accumulation and mitochondrial abnormalities inC. elegans. Thus, adequate saccharopine catabolism is essential for mitochondrial homeostasis. Our study provides mechanistic and therapeutic insights for understanding and treating hyperlysinemia II (saccharopinuria), an aminoacidopathy with severe developmental defects.
| 论文编号: | DOI:10.1083/jcb.201807204 |
| 论文题目: | The Lysine Catabolite Saccharopine Impairs Development by Disrupting Mitochondrial Homeostasis |
| 英文论文题目: | The Lysine Catabolite Saccharopine Impairs Development by Disrupting Mitochondrial Homeostasis |
| 第一作者: | Junxiang Zhou, Xin Wang, Min Wang, Yuwei Chang, Fengxia Zhang, Zhaonan Ban, Ruofeng Tang, Qiwen Gan, Shaohuan Wu, Ye Guo, Qian Zhang, Fengyang Wang, Liyuan Zhao, Yudong Jing, Wenfeng Qian, Guodong Wang, Weixiang Guo, Chonglin Yang |
| 英文第一作者: | Junxiang Zhou, Xin Wang, Min Wang, Yuwei Chang, Fengxia Zhang, Zhaonan Ban, Ruofeng Tang, Qiwen Gan, Shaohuan Wu, Ye Guo, Qian Zhang, Fengyang Wang, Liyuan Zhao, Yudong Jing, Wenfeng Qian, Guodong Wang, Weixiang Guo, Chonglin Yang |
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| 发表年度: | 2018-12-28 |
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| 摘要: | Amino acid catabolism is frequently executed in mitochondria; however, it is largely unknown how aberrant amino acid metabolism affects mitochondria. Here we report the requirement for mitochondrial saccharopine degradation in mitochondrial homeostasis and animal development. InCaenorhbditis elegans, mutations in the saccharopine dehydrogenase (SDH) domain of the bi-functional enzyme α-aminoadipic semialdehyde synthase AASS-1 greatly elevate the lysine catabolic intermediate saccharopine, which causes mitochondrial damage by disrupting mitochondrial dynamics, leading to reduced adult animal growth. In mice, failure of mitochondrial saccharopine oxidation causes lethal mitochondrial damage in the liver, leading to postnatal developmental retardation and death. Importantly, genetic inactivation of genes that raise the mitochondrial saccharopine precursors lysine and α-ketoglutarate strongly suppresses SDH mutation-induced saccharopine accumulation and mitochondrial abnormalities inC. elegans. Thus, adequate saccharopine catabolism is essential for mitochondrial homeostasis. Our study provides mechanistic and therapeutic insights for understanding and treating hyperlysinemia II (saccharopinuria), an aminoacidopathy with severe developmental defects. |
| 英文摘要: | Amino acid catabolism is frequently executed in mitochondria; however, it is largely unknown how aberrant amino acid metabolism affects mitochondria. Here we report the requirement for mitochondrial saccharopine degradation in mitochondrial homeostasis and animal development. InCaenorhbditis elegans, mutations in the saccharopine dehydrogenase (SDH) domain of the bi-functional enzyme α-aminoadipic semialdehyde synthase AASS-1 greatly elevate the lysine catabolic intermediate saccharopine, which causes mitochondrial damage by disrupting mitochondrial dynamics, leading to reduced adult animal growth. In mice, failure of mitochondrial saccharopine oxidation causes lethal mitochondrial damage in the liver, leading to postnatal developmental retardation and death. Importantly, genetic inactivation of genes that raise the mitochondrial saccharopine precursors lysine and α-ketoglutarate strongly suppresses SDH mutation-induced saccharopine accumulation and mitochondrial abnormalities inC. elegans. Thus, adequate saccharopine catabolism is essential for mitochondrial homeostasis. Our study provides mechanistic and therapeutic insights for understanding and treating hyperlysinemia II (saccharopinuria), an aminoacidopathy with severe developmental defects. |
| 刊物名称: | The Journal of Cell Biology |
| 英文刊物名称: | The Journal of Cell Biology |
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| 其它备注: | Junxiang Zhou, Xin Wang, Min Wang, Yuwei Chang, Fengxia Zhang, Zhaonan Ban, Ruofeng Tang, Qiwen Gan, Shaohuan Wu, Ye Guo, Qian Zhang, Fengyang Wang, Liyuan Zhao, Yudong Jing, Wenfeng Qian, Guodong Wang, Weixiang Guo, Chonglin Yang. The Lysine Catabolite Saccharopine Impairs Development by Disrupting Mitochondrial Homeostasis. The Journal of Cell Biology. DOI:10.1083/jcb.201807204 |
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