ATP:ADP adenylyltransferase activity / basophil activation involved in immune response / positive regulation of inflammatory response to antigenic stimulus / Mitochondrial tRNA aminoacylation / lysine-tRNA ligase / Selenoamino acid metabolism / lysine-tRNA ligase activity / lysyl-tRNA aminoacylation / diadenosine tetraphosphate biosynthetic process / Cytosolic tRNA aminoacylation ...ATP:ADP adenylyltransferase activity / basophil activation involved in immune response / positive regulation of inflammatory response to antigenic stimulus / Mitochondrial tRNA aminoacylation / lysine-tRNA ligase / Selenoamino acid metabolism / lysine-tRNA ligase activity / lysyl-tRNA aminoacylation / diadenosine tetraphosphate biosynthetic process / Cytosolic tRNA aminoacylation / aminoacyl-tRNA synthetase multienzyme complex / positive regulation of macrophage activation / tRNA processing / amino acid binding / response to X-ray / Transcriptional and post-translational regulation of MITF-M expression and activity / ERK1 and ERK2 cascade / 転移酵素; リンを含む基を移すもの; 核酸を移すもの / tRNA binding / mitochondrial matrix / positive regulation of DNA-templated transcription / protein homodimerization activity / mitochondrion / extracellular space / nucleoplasm / ATP binding / identical protein binding / nucleus / plasma membrane / cytosol / cytoplasm 類似検索 - 分子機能
Bacterial/eukaryotic lysine-tRNA ligase, class II / Lysine-tRNA ligase, class II / Lysine-tRNA ligase, class II, N-terminal / Lysyl-tRNA synthetase, class II, C-terminal / Aminoacyl-tRNA synthetase, class II (D/K/N) / tRNA synthetases class II (D, K and N) / OB-fold nucleic acid binding domain, AA-tRNA synthetase-type / OB-fold nucleic acid binding domain / Aminoacyl-tRNA synthetase, class II / Aminoacyl-transfer RNA synthetases class-II family profile. ...Bacterial/eukaryotic lysine-tRNA ligase, class II / Lysine-tRNA ligase, class II / Lysine-tRNA ligase, class II, N-terminal / Lysyl-tRNA synthetase, class II, C-terminal / Aminoacyl-tRNA synthetase, class II (D/K/N) / tRNA synthetases class II (D, K and N) / OB-fold nucleic acid binding domain, AA-tRNA synthetase-type / OB-fold nucleic acid binding domain / Aminoacyl-tRNA synthetase, class II / Aminoacyl-transfer RNA synthetases class-II family profile. / Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL) / Nucleic acid-binding, OB-fold 類似検索 - ドメイン・相同性
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
AI157890-01A1 (R21 grant)
米国
引用
ジャーナル: Nucleic Acids Res / 年: 2025 タイトル: Structural basis for aminoacylation of cellular modified tRNALys3 by human lysyl-tRNA synthetase. 著者: Swapnil C Devarkar / Christina R Budding / Chathuri Pathirage / Arundhati Kavoor / Cassandra Herbert / Patrick A Limbach / Karin Musier-Forsyth / Yong Xiong / 要旨: The average eukaryotic transfer ribonucleic acid (tRNA) contains 13 post-transcriptional modifications; however, their functional impact is largely unknown. Our understanding of the complex tRNA ...The average eukaryotic transfer ribonucleic acid (tRNA) contains 13 post-transcriptional modifications; however, their functional impact is largely unknown. Our understanding of the complex tRNA aminoacylation machinery in metazoans also remains limited. Herein, using a series of high-resolution cryo-electron microscopy (cryo-EM) structures, we provide the mechanistic basis for recognition and aminoacylation of fully modified cellular tRNALys3 by human lysyl-tRNA synthetase (h-LysRS). The tRNALys3 anticodon loop modifications S34 (mcm5s2U) and R37 (ms2t6A) play an integral role in recognition by h-LysRS. Modifications in the T-, variable-, and D-loops of tRNALys3 are critical for ordering the metazoan-specific N-terminal domain of LysRS. The two catalytic steps of tRNALys3 aminoacylation are structurally ordered; docking of the 3'-CCA end in the active site cannot proceed until the lysyl-adenylate intermediate is formed and the pyrophosphate byproduct is released. Association of the h-LysRS-tRNALys3 complex with a multi-tRNA synthetase complex-derived peptide shifts the equilibrium toward the 3'-CCA end "docked" conformation and allosterically increases h-LysRS catalytic efficiency. The insights presented here have broad implications for understanding the role of tRNA modifications in protein synthesis, the human aminoacylation machinery, and the growing catalog of metabolic and neurological diseases linked to it.