タンパク質・ペプチド: Isoform ATE1-2 of Arginyl-tRNA--protein transferase 1
リガンド: ZINC ION
キーワード
arginylation / ATE1 / apo / TRANSFERASE
機能・相同性
機能・相同性情報
protein arginylation / arginyltransferase / arginyl-tRNA--protein transferase activity / proteasomal protein catabolic process / response to oxidative stress / ubiquitin-dependent protein catabolic process / nucleus / cytoplasm 類似検索 - 分子機能
National Institutes of Health/National Cancer Institute (NIH/NCI)
CA241301
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
CA240993
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM133841
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM142002
米国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: Oligomerization and a distinct tRNA-binding loop are important regulators of human arginyl-transferase function. 著者: Xin Lan / Wei Huang / Su Bin Kim / Dechen Fu / Thilini Abeywansha / Jiemin Lou / Udayakumaran Balamurugan / Yong Tae Kwon / Chang Hoon Ji / Derek J Taylor / Yi Zhang / 要旨: The arginyl-transferase ATE1 is a tRNA-dependent enzyme that covalently attaches an arginine molecule to a protein substrate. Conserved from yeast to humans, ATE1 deficiency in mice correlates with ...The arginyl-transferase ATE1 is a tRNA-dependent enzyme that covalently attaches an arginine molecule to a protein substrate. Conserved from yeast to humans, ATE1 deficiency in mice correlates with defects in cardiovascular development and angiogenesis and results in embryonic lethality, while conditional knockouts exhibit reproductive, developmental, and neurological deficiencies. Despite the recent revelation of the tRNA binding mechanism and the catalytic cycle of yeast ATE1, the structure-function relationship of ATE1 in higher organisms is not well understood. In this study, we present the three-dimensional structure of human ATE1 in an apo-state and in complex with its tRNA cofactor and a peptide substrate. In contrast to its yeast counterpart, human ATE1 forms a symmetric homodimer, which dissociates upon binding of a substrate. Furthermore, human ATE1 includes a unique and extended loop that wraps around tRNA, creating extensive contacts with the T-arm of the tRNA cofactor. Substituting key residues identified in the substrate binding site of ATE1 abolishes enzymatic activity and results in the accumulation of ATE1 substrates in cells.