title: Recent aspects of genetic manipulation in Bacillus thuringiensis.
abstract: The conjugative plasmid pAM beta 1 was transferred from Streptococcus faecalis to several strains of Bacillus thuringiensis by a filter-mating process. From a transconjugant clone of B. thuringiensis a hybrid plasmid resulting from an in vivo insertion into pAM beta 1 of a 3 Md DNA sequence was isolated. This 3 Md DNA molecule (Th sequence) is related to several host plasmids found in different serotypes of B. thuringiensis. A reciprocal conjugation-like process involving the transfer of pAM beta 1 from B. thuringiensis to S. faecalis was also demonstrated. The comparison of the restriction maps of the crystal genes from plasmid and chromosomal origins of different serotypes, six of which having been cloned in E. coli, revealed the existence of two classes of genes which are very similar in the map corresponding to the N-terminal part of the protein, and which differ essentially in the 3' region. The presence of the transposon-like Th sequence was found in several cases associated with the crystal gene in the same host plasmid, and a model for their structural organization is proposed.
authors.forename: D
authors.initials: D
authors.lastname: Lereclus
authors.forename: M M
authors.initials: MM
authors.lastname: Lecadet
authors.forename: A
authors.initials: A
authors.lastname: Klier
authors.forename: J
authors.initials: J
authors.lastname: Ribier
authors.forename: G
authors.initials: G
authors.lastname: Rapoport
authors.forename: R
authors.initials: R
authors.lastname: Dedonder
mesh_terms: D001413:Bacillus thuringiensis / Q000235:genetics*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics; D001427:Bacterial Toxins; D001483:Base Sequence; D003001:Cloning, Molecular; D003227:Conjugation, Genetic; D004262:DNA Restriction Enzymes; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000235:genetics; D004731:Endotoxins; D013293:Enterococcus faecalis / Q000235:genetics; D005798:Genes, Bacterial; D006460:Hemolysin Proteins; D009693:Nucleic Acid Hybridization; D010957:Plasmids
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis; D004262:DNA Restriction Enzymes