title: Two putative insertion sequences flank a truncated glycogen branching enzyme gene in the thermophile Bacillus stearothermophilus CU21.
abstract: We have isolated a region from the Bacillus stearothermophilus CU21 chromosome hybridizing strongly to a fragment of the B. caldolyticus glycogen operon. Sequence analysis of this region revealed the presence of a truncated glgB gene encoding the N-terminus of branching enzyme. A region highly similar to an internal fragment of B. caldolyticus glgC encoding ADP-glucose pyrophosphorylase was located approximately 1kb downstream from the incomplete glgB gene. The two truncated genes appeared to flank a sequence with characteristics of bacterial Insertion Sequences, which was designated RSBst-alpha. The presence of RSBst-alpha at this position indicates that integration of (an) IS-like element(s) may have been involved in deletion formation in the putative glycogen operon. Upstream of glgB an additional incomplete ORF was found with significant similarity to putative transposases from bacterial Insertion Sequences. This region was designated RSBst-beta. Both RSBst-alpha and RSBst-beta appeared to be present in multiple copies in the B. stearothermophilus CU21 chromosome.
authors.affiliation: Department of Genetics, Centre of Biological Sciences, Haren, The Netherlands.
authors.forename: J A
authors.initials: JA
authors.lastname: Kiel
authors.forename: J M
authors.initials: JM
authors.lastname: Boels
authors.forename: A M
authors.initials: AM
authors.lastname: Ten Berge
authors.forename: G
authors.initials: G
authors.lastname: Venema
mesh_terms: D015061:1,4-alpha-Glucan Branching Enzyme / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D005798:Genes, Bacterial; D001411:Geobacillus stearothermophilus / Q000201:enzymology / Q000235:genetics*; D008969:Molecular Sequence Data; D009876:Operon; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid
chemical_list: D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D015061:1,4-alpha-Glucan Branching Enzyme