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Nucleic Acids Research, 1990, Vol. 18, No. 1 75-82
© 1990

MOLECULAR BIOLOGY

Structure and expression of the Euglena gracilis nuclear gene coding for the translation elongation factor EF-1 {alpha}

Paul-Etienne Montandon* and Erhard Stutz

Laboratoire de Biochimie Végétale, Université de Neuchâtel Ch. de Chantemerle 18, CH-2000 Neuchâtel, Switzerland

Received October 17, 1989. Accepted November 29, 1989.

A cDNA library from the protist Euglena gracilis was used to isolate and sequence an ORF coding for the elongation factor protein EF-l{alpha}. The decoded amino acid sequence (MW, 48'515) is to 75–80% identical with other eukaryotic EF-1 a sequences but only to 24% identical with the Euglena chloroplast EF-Tu. Homologous DNA probes interact with multiple fragments of Euglena nuclear restricted DNA typical for a multimembered gene family. We present the restriction sites map of four tef nuclear gene loci and postulate that the nuclear genome also contains tef related sequences (e.g. pseudogenes). Expression of tef gene(s) is monitored by Northern hybridization and the 5' end of a stable transcript (1.5 kb) is sequenced and shown to precede the start codon by 29 positions only. The steady state concentration of the 1.5 kb mRNA is not influenced by switching cell growth conditions from dark to light (chloroplast development).

* Present address: Service de I'HygiÈne et de I'Environnement, Avenue Léopold-Roben 36, CH-2300 La Chaux-de-Fonds, Switzerland


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Y.-i. Watanabe and M. W. Gray
Evolutionary appearance of genes encoding proteins associated with box H/ACA snoRNAs: Cbf5p in Euglena gracilis, an early diverging eukaryote, and candidate Gar1p and Nop10p homologs in archaebacteria
Nucleic Acids Res., June 15, 2000; 28(12): 2342 - 2352.
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