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ABC50 mutants modify translation start codon selection.

Joanna D Stewart1, Joanne L Cowan1, Lisa S Perry1

  • 1*Centre for Biological Sciences, University of Southampton, Southampton SO17 1BJ, U.K.

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ATP-binding cassette 50 (ABC50) is crucial for accurate translation initiation. Mutants impairing its function reduce translation efficiency and allow the use of incorrect start codons, highlighting ABC50's role in start-site selection accuracy.

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Area of Science:

  • Molecular Biology
  • Protein Synthesis
  • Gene Expression Regulation

Background:

  • Translation initiation is a critical step in gene expression, requiring precise selection of the start codon.
  • ATP-binding cassette 50 (ABC50), also known as ABCF1, interacts with eukaryotic initiation factor 2 (eIF2) and is vital for efficient translation.
  • Factors like eIF1, eIF1A, and eIF5 are known to modulate the stringency of start-site selection.

Purpose of the Study:

  • To investigate the role of ATP hydrolysis by ABC50 in translation initiation and start-site selection accuracy.
  • To determine how non-hydrolyzable ABC50 mutants affect general translation and codon discrimination.

Main Methods:

  • Expression of wild-type and ATP-hydrolysis-deficient ABC50 mutants in cellular systems.
  • Analysis of general translation rates and initiation factor association with ribosomal subunits.
  • Assessment of start-site selection stringency using non-AUG codons.

Main Results:

  • Expression of ABC50 mutants that cannot hydrolyze ATP led to decreased general translation.
  • These mutants relaxed the discrimination against non-AUG codons at translation start sites.
  • The association of key initiation factors with 40S subunits remained largely unaffected by the mutants.
  • Overexpression of eIF1 restored the stringency of start-site selection, confirming its role.

Conclusions:

  • ATP hydrolysis by ABC50 is essential for maintaining the accuracy of translation initiation codon selection.
  • Interference with ABC50 function compromises the fidelity of start-site selection, impacting protein synthesis.
  • eIF1 plays a critical role in enhancing start-site selection stringency, counteracting defects in ABC50 function.