title: Molecular cloning and nucleotide sequences of the genes for two essential proteins constituting a novel enzyme system for heptaprenyl diphosphate synthesis.
abstract: The genes encoding two dissociable components essential for Bacillus stearothermophilus heptaprenyl diphosphate synthase (all-trans-hexparenyl-diphosphate:isopentenyl-diphosphate hexaprenyl-trans-transferase, EC 2.5.1.30) were cloned, and their nucleotide sequences were determined. Sequence analyses revealed the presence of three open reading frames within 2,350 base pairs, designated as ORF-1, ORF-2, and ORF-3 in order of nucleotide sequence, which encode proteins of 220, 234, and 323 amino acids, respectively. Deletion experiments have shown that expression of the enzymatic activity requires the presence of ORF-1 and ORF-3, but ORF-2 is not essential. As a result, this enzyme was proved genetically to consist of two different protein compounds with molecular masses of 25 kDa (Component I) and 36 kDa (Component II), encoded by two of the three tandem genes. The protein encoded by ORF-1 has no similarity to any protein so far registered. However, the protein encoded by ORF-3 shows a 32% similarity to the farnesyl diphosphate synthase of the same bacterium and has seven highly conserved regions that have been shown typical in prenyltransferases (Koyama, T., Obata, S., Osabe, M., Takeshita, A., Yokoyama, K., Uchida, M., Nishino, T., and Ogura, K. (1993) J. Biochem. (Tokyo) 113, 355-363).
authors.affiliation: Bio Research Laboratory, Toyota Motor Corporation, Aichi, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Koike-Takeshita
authors.forename: T
authors.initials: T
authors.lastname: Koyama
authors.forename: S
authors.initials: S
authors.lastname: Obata
authors.forename: K
authors.initials: K
authors.lastname: Ogura
mesh_terms: D019883:Alkyl and Aryl Transferases; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D005798:Genes, Bacterial / Q000235:genetics*; D001411:Geobacillus stearothermophilus / Q000201:enzymology / Q000235:genetics*; D051228:Geranyltranstransferase; D008969:Molecular Sequence Data; D016366:Open Reading Frames / Q000235:genetics; D009943:Organophosphorus Compounds / Q000138:chemical synthesis*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014166:Transferases / Q000235:genetics* / Q000378:metabolism
chemical_list: D009943:Organophosphorus Compounds; D014166:Transferases; D019883:Alkyl and Aryl Transferases; D051228:Geranyltranstransferase; C024844:trans-hexaprenyltranstransferase