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. 1992 Feb 25;20(4):665–669. doi: 10.1093/nar/20.4.665

Differential expression of genes encoding the hypusine-containing translation initiation factor, eIF-5A, in tobacco.

D Chamot 1, C Kuhlemeier 1
PMCID: PMC312002  PMID: 1542563

Abstract

Two Nicotiana plumbaginifolia cDNA clones, NeIF-5A1 and NeIF-5A2, encoding eukaryotic translation initiation factor eIF-5A (formerly called eIF-4D) were cloned by heterologous screening with Dictyostelium and human eIF-5A probes. eIF-5A is the only protein known to contain a unique amino acid modification, hypusine. Comparison of the Nicotiana deduced amino acid sequences with those of other eIF-5A polypeptides reveals conservation throughout the coding sequence, especially in the region of the hypusine residue. Transcript analysis reveals that NeIF-5A1 is preferentially expressed in photosynthetic tissues, while NeIF-5A2 is constitutively expressed in all plant tissues examined. A polyclonal antibody was raised against NeIF-5A1 overexpressed in E. coli. NeIF-5A1 antiserum crossreacts with an 18 kDa polypeptide doublet in all tobacco tissues examined. At least one polypeptide of ca. 18 kDa from a diversity of higher and lower plants crossreacts with NeIF-5A1 antiserum.

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Selected References

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