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Unexpected enzymatic function of an ancient nucleic acid-binding fold.

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Trypanosoma brucei MCP1, a protein with an OB-fold, unexpectedly deacylates Ala-tRNAs, ensuring translation fidelity. This conserved function highlights an ancient nucleic acid binding domain

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Aminoacyl-tRNA synthetases (ARSs) are crucial for protein synthesis fidelity.
  • Eukaryotic ARSs assemble into a multi-aminoacyl-tRNA synthetase complex (MSC).
  • The Trypanosoma brucei MSC contains OB-fold proteins MCP1 and MCP2, and the deacylase MCP3.

Purpose of the Study:

  • To investigate the unexplored enzymatic activity of MCP1.
  • To determine the role of MCP1 within the Trypanosoma brucei MSC.
  • To understand the functional significance of OB-fold proteins in tRNA metabolism.

Main Methods:

  • Recombinant expression and purification of MCP1.
  • In vitro deacylation assays using Ala-tRNAs.
  • Domain deletion and site-directed mutagenesis of MCP1.
  • Cross-species complementation assays using Saccharomyces cerevisiae Arc1p.

Main Results:

  • Recombinant MCP1 exhibits Ala-tRNA deacylation activity.
  • The OB-fold of MCP1 contains the catalytic pocket for deacylation.
  • Key residues (K326, R331, S335) within the OB-fold are essential for activity.
  • MCP1's deacylation function is conserved in Saccharomyces cerevisiae.

Conclusions:

  • MCP1 possesses a novel, conserved tRNA deacylation activity.
  • The OB-fold domain has an unexpected enzymatic function in nucleic acid metabolism.
  • This finding explains the 3' CCA-end binding activity of this protein family.
  • The study reveals an ancient function of OB-fold domains in maintaining translational accuracy.