title: Tryptophan biosynthesis genes trpEGC in the thermoacidophilic archaebacterium Sulfolobus solfataricus.
abstract: A DNA fragment containing the trpEGC gene cluster was isolated from the thermoacidophilic archaebacterium Sulfolobus solfataricus. The products of trpE, trpG, and trpC from S. solfataricus were compared to the homologous products from a eukaryote, a eubacterium, and two archaebacteria, namely, a methanogen and an extreme halophile. They appeared to be equally related to the proteins from Escherichia coli and Saccharomyces cerevisiae, the percentages of conserved amino acids being roughly the same as those measured when comparing the eubacterial and eukaryotic sequences directly. These percentages did not rise significantly when a comparison with the proteins from Haloferax volcanii was drawn, while a slightly closer relationship with the proteins from Methanococcus thermoautotrophicum was found.
authors.affiliation: Dipartimento di Chimica Organica e Biologica, Università di Napoli, Italy.
authors.forename: M L
authors.initials: ML
authors.lastname: Tutino
authors.forename: G
authors.initials: G
authors.lastname: Scarano
authors.forename: G
authors.initials: G
authors.lastname: Marino
authors.forename: G
authors.initials: G
authors.lastname: Sannia
authors.forename: M V
authors.initials: MV
authors.lastname: Cubellis
mesh_terms: D000595:Amino Acid Sequence; D000878:Anthranilate Synthase / Q000235:genetics*; D001483:Base Sequence; D003062:Codon / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics*; D005798:Genes, Bacterial / Q000235:genetics*; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D016944:Sulfolobus / Q000235:genetics*
chemical_list: D003062:Codon; D005656:Fungal Proteins; D000878:Anthranilate Synthase