Secondary structure prediction for the PABP-interacting region in various eRF3 homologues. Alignment of the N-terminal parts of Xenopus (xeRF3, aa 51 to 87), human (hGSPT1, aa 48 to 85), mouse (mGSPT2, aa 35 to 76), and yeast (yeRF3, aa 109 to 149) eRF3 proteins was performed with the MULTALIN (17) program (http://npsa-pbil.ibcp.fr). The PABP-interacting consensus sequence (LNVNAKPFVP) (57) is shown in boldface. Sec, secondary structure predicted by SOPM algorithm (37); c, random coil; e, extended strand; t, beta turn. The α-helical region (h) is underlined.