Table S2. Plasmids used in this study. Plasmid pM128 (1-1-1-1) pM114 (1-1-4-4) pVM35 (4-4-4-4) pVM36 (4-4-1-1) pVM15 (DEL6) pVM14 (DEL16) pVM13 (DEL26) pVM12 (DEL36) pVM11 (DEL46) pVM16 (DELup39) Description low copy URA3 vector containing uORF1 only at its original position (350 nt from GCN4-lacZ), with HindIII restriction site upstream of uORF1 low copy URA3 vector containing uORF1 only (with HindIII upstream); the coding sequence and 25 nt of its 3' flanking sequence was replaced by the corresponding sequences of uORF4 low copy URA3 vector containing uORF1 only (with HindIII upstream); uORF1’s 5’ flanking sequences (nt -181 to -1), the coding region, and the 3’ flanking sequences (25 nt beyond the stop codon) were replaced by the corresponding sequences of uORF4 low copy URA3 vector containing uORF1 only only (with HindIII upstream); ); uORF1’s 5’ flanking sequences (nt -181 to -1) were replaced by the corresponding sequences of uORF4 low copy URA3 vector containing uORF1 only at its original position; the sequences -21 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -31 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -41 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -51 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -61 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -181 to -143 upstream of uORF1 were deleted Source of reference [4] [5] This study This study This study This study This study This study [2] This study pVM18 (DEL56) pVM20 (DEL76) pVM21 (DEL109) pVM45 (SUB31) pVM46 (SUB41) pVM47 (SUB49) pVM26 (DELII) pVM27 (CAAII) pVM31 (AA-C) pVM50 (DEL36+AA-C) pVM80 (G4-uORF1) pVM91 (Y1-uORF1) low copy URA3 vector containing uORF1 only at its original position; the sequences -71 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -91 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -125 to -16 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequence -40 to -32 upstream of uORF1 were substituted by complementary sequences low copy URA3 vector containing uORF1 only at its original position; the sequences -49 to -41 upstream of uORF1 were substituted by complementary sequences low copy URA3 vector containing uORF1 only at its original position; the sequences -54 to -50 upstream of uORF1 were substituted by complementary sequences low copy URA3 vector containing uORF1 only at its original position; the sequences -76 to -55 upstream of uORF1 were deleted low copy URA3 vector containing uORF1 only at its original position; the sequences -76 to -55 upstream of uORF1 were substituted by a stretch of CAA triplets of the identical length to the original sequence low copy URA3 vector containing uORF1 only at its original position; G-129A, C-128A and G-109C substitutions were inserted upstream of uORF1 low copy URA3 vector containing uORF1 only at its original position; the uORF1’s mutations DEL36 and AA-C were combined low copy URA3 vector containing uORF1 only at its original position (350 nt from GCN4-lacZ) with SacII restriction site upstream of uORF1 low copy URA3 vector containing uORF1 only at its original position; the 5’ UTR of uORF1 of GCN4 (-229_-9) was replaced by the corresponding sequence of This study This study This study This study This study This study This study This study This study This study This study This study YAP1 (-81_-9) pVM92 low copy URA3 vector containing uORF1 only at its original position; the 5’ UTR of uORF1 of GCN4 (-229_-9) was replaced by the corresponding sequence of (Y2-uORF1) YAP2 (-101_-9) low copy URA3 vector containing the YAP1 gene with its complete 5’ UTR pVM95 fused with lacZ under control of the GCN4 promoter (Y1-lacZ) low copy URA3 vector containing the YAP2 gene with its complete 5’ UTR pVM96 fused with lacZ under control of the GCN4 promoter (Y2-lacZ) pVM97 a derivative of pVM91; C-32G and G-33G substitutions were inserted upstream (Y1-uORF1-“stem”_C-32G G-33C) of uORF1 pVM98 derivative of pVM91, G-45U and C-57A substitutions were inserted upstream of (Y1-uORF1-hairpin_G-45U C-57A) uORF1 low copy URA3 vector containing wild-type GCN4 leader p180 (YCp50–GCN4–lacZ) low copy URA3 vector containing uORF1 only placed 32 nt from GCN4-lacZ pG67 pM199 low copy URA3 vector containing uORF1 only at the position of uORF4 (140 nt from GCN4-lacZ) p209 low copy URA3 vector containing uORF1 only at its original position (350 nt from GCN4-lacZ) pM23 (supp info) low copy URA3 vector containing uORF1 and uORF4 only at their original # positions relative to GCN4-lacZ (wt ; 1-1-1-1) pVM55 (supp info) derivative of pM23; mutation DEL16 introduced upstream of uORF1 (DEL16) pVM54 (supp info) derivative of pM23; mutation DEL36 introduced upstream of uORF1 (DEL36) pVM59 (supp info) derivative of pM23; mutation SUB49 introduced upstream of uORF1 (SUB49) pVM60 (supp info) derivative of pM23; deletion of a double-circle hairpin (nt -129 to -83) upstream This study This study This study This study This study [10] [11] [11] [4] [5] This study This study This study This study (DELhairpin) pVM61(supp info) (DELII) pVM56 (supp info) (CAAII) pVM53 (supp info) (DEL46) pVM52 (supp info) (DELup39) pVM37 (supp info) (bg#; 4-4-1-1) YCplac111 of uORF1 derivative of pM23; mutation DELII introduced upstream of uORF1 This study derivative of pM23; mutation CAAII introduced upstream of uORF1 This study derivative of pM23; mutation DEL46 introduced upstream of uORF1 This study derivative of pM23; mutation DELup39 introduced upstream of uORF1 This study derivative of pM23; mutation 4-4-1-1 introduced upstream of uORF1 This study single-copy cloning vector, LEU2 [7] pRS-a/TIF32-His low-copy a/TIF32-His in LEU2 plasmid, from pRS315 [6] YCp-a/TIF32-His-L YCp-a/TIF32-His-screen single-copy a/TIF32-His in LEU2 plasmid, from YCplac111 single-copy a/TIF32-His with BamHI and NdeI sites introduced just in front of the start codon of a/TIF32 in LEU2 plasmid, from YCplac111 single-copy a/tif32-Box6-His in LEU2 plasmid, from YCplac111 single-copy a/tif32-Box8-His in LEU2 plasmid, from YCplac111 single-copy a/tif32-Box17- His in LEU2 plasmid, from YCplac111 single-copy a/tif32-Box6+8- His in LEU2 plasmid, from YCplac111 single-copy a/tif32-Box6+17- His in LEU2 plasmid, from YCplac111 single-copy a/tif32-Box8+17- His in LEU2 plasmid, from YCplac111 cloning vector for GAL4 activation domain fusion followed by T7 promoter,LEU2 a/TIF32-NTD cloned under T7 promoter, from pGADT7 a/tif32-NTD-Box6 cloned under T7 promoter, from pGADT7 This study This study YCp-a/tif32-Box6-His YCp-a/tif32-Box8-His YCp-a/tif32-Box17-His YCp-a/tif32-Box6+8-His YCp-a/tif32-Box6+17-His YCp-a/tif32-Box8+17-His pGADT7 (supp info) pGAD-a/TIF32-NTD (supp info) pGAD-a/tif32-NTD-Box6 (supp This study This study This study This study This study This study CLONTECH This study This study info) pGAD- a/tif32-NTD-Box17 (supp info) pGAD- a/tif32-NTD-Box6+17 (supp info) pGEX-RPS0A (supp info) a/tif32-NTD-Box17 cloned under T7 promoter, from pGADT7 This study a/tif32-NTD-Box6+17 cloned under T7 promoter, from pGADT7 This study GST-RPS0A fusion plasmid from pGEX-4T-1 I.D. and L.V. unpublished data