Sequence analysis of the EF-1 alpha gene family of Mucor racemosus.
Our previous studies have shown that Mucor racemosus possesses three genes (TEF-1, -2 and -3) for EF-1 alpha, and that all three genes are transcribed. However, the level of transcription varies markedly between the three genes, with TEF-1 mRNA levels being approximately two fold higher than TEF-3 and 6 fold higher than TEF-2. We have now completed the DNA sequence of both strands of all three genes and have found that these genes are highly homologous. TEF-2 and TEF-3 are more similar to each other than they are to TEF-1. The TEF-2 and the TEF-3 coding regions differ from TEF-1 at 30 and 37 positions respectively out of 1374 nucleotides. Twenty-six of these nucleotide substitutions were common to both TEF-2 and TEF-3, and the majority of the substitutions were clustered in the 5' region of the coding sequences. While the majority of these changes were silent, TEF-2 and TEF-3 differed from TEF-1 by having a lysine instead of a glutamate at amino acid position 41. In addition, TEF-2 and -3, but not TEF-1, each have an intron located near the 5' end of the coding region, although its size and sequence is not conserved between the two genes. All three genes have a conserved intron near the 3' end of the coding region. The sequence data have been analyzed with respect to the structure and function of EF-1 alpha in protein biosynthesis.
Department of Microbiology and Molecular Genetics, University of California, Irvine.
P
P
Sundstrom
L M
LM
Lira
D
D
Choi
J E
JE
Linz
P S
PS
Sypherd
D000595:Amino Acid Sequence; D001483:Base Sequence; D003062:Codon; D005091:Exons; D005800:Genes, Fungal; D007438:Introns; D008969:Molecular Sequence Data; D009089:Mucor / Q000235:genetics*; D010445:Peptide Elongation Factors / Q000235:genetics*
D003062:Codon; D010445:Peptide Elongation Factors