YNL292W PUS4 SGDID:S000005236, Chr XIV from 82806-84017, Genome Release 64-1-1, Verified ORF, "Pseudouridine synthase, catalyzes only the formation of pseudouridine-55 (Psi55), a highly conserved tRNA modification, in mitochondrial and cytoplasmic tRNAs; PUS4 overexpression leads to translational derepression of GCN4 (Gcd- phenotype)"