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Oligomerization and a distinct tRNA-binding loop are important regulators of human arginyl-transferase function

Author

Listed:
  • Xin Lan

    (Case Western Reserve University)

  • Wei Huang

    (Case Western Reserve University)

  • Su Bin Kim

    (Seoul National University)

  • Dechen Fu

    (Case Western Reserve University)

  • Thilini Abeywansha

    (Case Western Reserve University)

  • Jiemin Lou

    (Case Western Reserve University)

  • Udayakumaran Balamurugan

    (Case Western Reserve University)

  • Yong Tae Kwon

    (Seoul National University
    AUTOTAC Bio Inc.
    Seoul National University Hospital)

  • Chang Hoon Ji

    (Seoul National University
    AUTOTAC Bio Inc.)

  • Derek J. Taylor

    (Case Western Reserve University
    Case Western Reserve University
    Case Western Reserve University)

  • Yi Zhang

    (Case Western Reserve University
    Case Western Reserve University)

Abstract

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 tRNAArg, 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.

Suggested Citation

  • 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, 2024. "Oligomerization and a distinct tRNA-binding loop are important regulators of human arginyl-transferase function," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50719-w
    DOI: 10.1038/s41467-024-50719-w
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    References listed on IDEAS

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