亮氨酸tRNA合成酶1以葡萄糖依賴性方式調控亮氨酸代謝
作者:
小柯機器人發布時間:2019/11/29 12:40:02
亮氨酸tRNA合成酶1(LARS1)以葡萄糖依賴性方式調控亮氨酸代謝,這一成果由韓國國立首爾大學Sunghoon Kim、Jong Hyun Kim等研究人員合作完成。2019年11月28日,國際知名學術期刊《科學》在線發表了這一成果。
研究人員為LARS1在葡萄糖依賴的亮氨酸使用控制中的作用提供了證據。在葡萄糖飢餓時,ULK1(Unc-51 like autophagy activating kinase 1)在亮氨酸結合的關鍵殘基處將LARS1磷酸化。磷酸化的LARS1表現出亮氨酸結合減少,這可能抑制蛋白質合成並幫助節省能量。不用於合成代謝過程的亮氨酸可能可用於分解代謝途徑以產生能量。
LARS1介導的亮氨酸利用率變化可能有助於促進缺乏葡萄糖的細胞存活。因此,取決於葡萄糖的可用性,LARS1可以幫助調節亮氨酸是否用於蛋白質合成或能量產生。
據悉,儘管葡萄糖和胺基酸對於能量代謝很重要,但對兩種營養素之間的相互作用卻知之甚少。
附:英文原文
Title: Glucose-dependent control of leucine metabolism by leucyl-tRNA synthetase 1
Author: Ina Yoon, Miso Nam, Hoi Kyoung Kim, Hee-Sun Moon, Sungmin Kim, Jayun Jang, Ji Ae Song, Seung Jae Jeong, Sang Bum Kim, Seongmin Cho, YounHa Kim, Jihye Lee, Won Suk Yang, Hee Chan Yoo, Kibum Kim, Min-Sun Kim, Aerin Yang, Kyukwang Cho, Hee-Sung Park, Geum-Sook Hwang, Kwang Yeon Hwang, Jung Min Han, Jong Hyun Kim, Sunghoon Kim
Issue&Volume: 2020/11/28
Abstract: AbstractDespite the importance of glucose and amino acids for energy metabolism, interactions between the two nutrients are not well understood. We provide evidence for a role of leucyl-tRNA synthetase 1 (LARS1) in glucose-dependent control of leucine usage. Upon glucose starvation, LARS1 was phosphorylated by Unc-51 like autophagy activating kinase 1 (ULK1) at the residues crucial for leucine-binding. The phosphorylated LARS1 showed decreased leucine-binding, which may inhibit protein synthesis and help save energy. Leucine, not used to anabolic process, may be available to catabolic pathway for energy generation. The LARS1-mediated changes in leucine utilization might help support cell survival deprived of glucose. Thus, dependent on the availability of glucose, LARS1 may help regulate whether leucine is used for protein synthesis or energy production.
DOI: 10.1126/science.aau2753
Source: https://science.sciencemag.org/content/early/2019/11/25/science.aau2753
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037