Abstract
The maize genomic DNA sequence encoding the eukaryotic translation initiation factor 5 (eIF-5) has been isolated from genomic library of maize seedlings and the exon-intron structure determined (accession number AJ132240). The length of genomic DNA sequenced was about 7kb and contained two exons with the translation start site in exon 2. The only intron is located in the non-coding 5' region and it is 1298bp long with the splice acceptor and donor sites conforming to the AG/GT rules. Repetitive sequence fragments are located in the 5' and 3' intergenic region. The accumulation of eIF-5 mRNA was studied by RNA blot and in situ hybridization. The observed distribution of mRNA may correlate with the function of the protein, as it appears to be highly abundant in tissues where the proportion of cells actively dividing is very high, such as meristematic regions.
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