The RRM of PRT1 is required for its interaction with TIF32/RPG1, HCR1 and NIP1 in vivo. The RRM of PRT1 is required for its interaction with TIF32/RPG1,

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The RRM of PRT1 is required for its interaction with TIF32/RPG1, HCR1 and NIP1 in vivo. The RRM of PRT1 is required for its interaction with TIF32/RPG1, HCR1 and NIP1 in vivo. (A) Schematic of the PRT1 sequence showing the locations of the RRM and minimal TIF32‐ and HCR1‐binding sites, as in Figure 3. The line beneath the schematic depicts the amino acids present in the polyhistidine‐tagged prt1‐Δ100 product (prt1‐Δ100‐His), which lacks residues 34–136 and contains a His tag at the C‐terminus. (B) The dominant Slg− phenotype of prt1‐Δ100 can be suppressed by simultaneous overexpression of TIF34 and TIF35. Transformants of strain GDE303‐88 containing prt1‐Δ100 on low‐copy‐number (lc) plasmid pprt1‐Δ100, or the corresponding empty vector YCplac11, were transformed additionally with one of the following high‐copy‐number (hc) plasmids bearing the indicated genes or with the corresponding empty vector YEp112, YEpTIF34/35T (hc TIF34/TIF35), YEpTIF32T (hc TIF32), YEpLVHCR1‐1 (hc HCR1), YEpNIP1T (hc NIP1) and YEpTIF34T (hc TIF34). The resulting transformants were tested for growth at 30°C on SD medium supplemented with adenine. The plasmid combination present in each transformant is indicated above or below the appropriate plate sector. (C) Affinity purification of an eIF3 subcomplex containing prt1‐Δ100‐His, TIF34 and TIF35 but lacking TIF32 and NIP1. WCE was prepared in a low salt buffer (100 mM KCl) from transformants of yeast strain F353 bearing plasmid pLP101 containing PRT1‐His encoding His‐tagged PRT1 (lanes 1–3), pprt1‐Δ100‐His encoding prt1‐Δ100‐His (lanes 4–6) or empty vector YCplac11 (lanes 5–7). Extracts were incubated overnight with Ni2+‐NTA–silica resin and the bound proteins were eluted and subjected to SDS–PAGE. Proteins were transferred to nitrocellulose membranes and probed with the antibodies indicated on the right. Lanes 1, 4 and 7 each contained 3% of the flow‐through fractions from Ni2+‐NTA–silica binding (3% FT); lanes 2, 3, 5, 6, 8 and 9 contained 5 μg (2×) or 2.5 μg (1×) of the corresponding eluted fractions, as indicated above the lanes. Leoš Valášek et al. EMBO J. 2001;20:891-904 © as stated in the article, figure or figure legend