Repression of MRP51 in cis does not contribute to the synthetic growth defect conferred by an hphMX4-marked deletion of DBP1 in a ded1-ts mutant
Zhang, F.; Sen, N. D.; Hinnebusch, A. G.
Show abstract
Powers et al. recently demonstrated that the hphMX6 cassette used to delete DPB1 in dbp1{Delta}::hphMX6 yeast mutants leads to reduced expression in cis of the adjacent gene MRP51, encoding the mitochondrial small subunit (SSU) ribosomal protein Mrp51. Here we provide evidence that elimination of Dbp1, not reduced MRP51 expression, underlies the synthetic growth defect of a dbp1{Delta}::hphMX6 ded1-ts mutant on glucose-containing medium, where respiration is dispensable, consistent with our previous conclusion that Dbp1 and Ded1 perform overlapping functions in stimulating translation initiation on mRNAs burdened with long or structured 5UTRs in cells cultured with glucose.
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