Molecular cloning and sequence determination of the tuf gene coding for the elongation factor Tu of Thermus thermophilus HB8.
The tuf gene, which encodes the elongation factor Tu (EF-Tu) of Thermus thermophilus HB8, and its flanking regions were cloned and sequenced. The gene encoding EF-G was found upstream of the 5' end of the tuf gene. The tuf gene of T. thermophilus HB8 had a very high G + C content and 84.5% of the third base in codon usage was either G or C. The deduced primary structure of the EF-Tu was composed of 405 amino acid residues with a Mr = 44658. A comparison of the amino acid sequence of EF-Tu from T. thermophilus HB8 with those of Escherichia coli and Saccharomyces cerevisiae mitochondria showed a very high sequence homology (65-70%). Two Cys residues out of the three found in E. coli EF-Tu had been replaced with Val in T. thermophilus HB8 EF-Tu. An extra amino acid sequence of ten residues, consisting predominantly of basic amino acids (Met-182-Gly-191), which does not occur in EF-Tu of E. coli, was found in T. thermophilus HB8.
Kushiro
M
M
Facility of Pharmaceutical Sciences, Osaka University, Japan.
Shimizu
M
M
Tomita
K
K
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D010444:Peptide Elongation Factor Tu / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity; D013824:Thermus / Q000235:genetics* / Q000378:metabolism
D004262:DNA Restriction Enzymes; D010444:Peptide Elongation Factor Tu