title: Zymomonas mobilis squalene-hopene cyclase gene (shc): cloning, DNA sequence analysis, and expression in Escherichia coli.
abstract: Using a DNA probe from the gene encoding squalene-hopene cyclase (SHC, EC 5.4.99.-) from the Gram-positive bacterium Alicyclobacillus acidocaldarius, we have cloned a 4.3 kb HindIII fragment of chromosomal DNA from Zymomonas mobilis. An open reading frame of 1977 bp was detected that could encode a protein of 658 amino acids with a calculated molecular mass of 74077 Da. Under the control of lac or tac promoters, this gene, shc, was expressed in Escherichia coli K12 strains and its product had squalene-hopene cyclase activity. Sequence alignments with the A. acidocaldarius SHC, the lanosterol cyclase of the yeast Candida albicans, and the cycloartenol synthase of the plant Arabidopsis thaliana revealed six highly conserved regions (mainly in the C-terminal part) of the proteins. These regions contained the core motif Gln-X-X-X-Gly-X-Trp.
authors.affiliation: Institut für Biotechnologie, Forschungszentrums Jülich GmbH, Germany.
authors.forename: I G
authors.initials: IG
authors.lastname: Reipen
authors.forename: K
authors.initials: K
authors.lastname: Poralla
authors.forename: H
authors.initials: H
authors.lastname: Sahm
authors.forename: G A
authors.initials: GA
authors.lastname: Sprenger
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002176:Candida albicans / Q000201:enzymology / Q000235:genetics; D003001:Cloning, Molecular; D015342:DNA Probes; D004269:DNA, Bacterial / Q000737:chemistry / Q000378:metabolism; D004926:Escherichia coli; D005798:Genes, Bacterial; D006094:Gram-Positive Bacteria / Q000235:genetics; D019751:Intramolecular Transferases; D007535:Isomerases / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016366:Open Reading Frames; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000378:metabolism; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D017355:Zymomonas / Q000201:enzymology* / Q000235:genetics*
chemical_list: D015342:DNA Probes; D004269:DNA, Bacterial; D011994:Recombinant Proteins; D007535:Isomerases; D019751:Intramolecular Transferases; C066630:squalene-hopene cyclase