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Cover In Saccharomyces cerevisiae mitochondria, aminoacylation of tRNA glutamine (tRNA^Gln) occurs through a novel mechanism involving import of both cytoplasmic tRNAGln (blue ribbon diagrams) and the glutaminyl-tRNA synthetase enzyme (multicolored ribbon diagrams). Shown as insets are immunofluorescence analyses of cox2-mutant yeast mitochondria (cox2^amber), using antibodies directed against Cox2 (blue). Cox2 translation requires the mitochondrial import of suppressor tRNA^Gln (cox2^amber + tRNA^Gln_amber). (For details, see Rinehart et al., p. 583.)

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