We have cloned and sequenced a cDNA coding for rice elongation factor 1B (EF-Ifi). The clone was 1420 bp long and contained an open reading frame coding for 229 amino acids. The overall identity between rice EF-lp and rice EF-IF [Matsumoto, S., Oizumi, N., Taira, H. and Ejiri, S. (1992) FEBS Lett. 3 11, 46481 is 60% at the amino acid sequence level; a higher percent identical residues (8 1%) were especially observed in the C-terminal region. Rice EF-l/7 has no conserved phosphorylation site for casein kinase II and no leucine zipper motif, although these motifs are well conserved m EF-16 (=/I in plants) subunits of animal EF-1.

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