title: Characterization of the relA/spoT gene from Bacillus stearothermophilus.
abstract: By use of degenerate primers, we amplified a fragment of a relA/spoT homologous gene from Bacillus stearothermophilus. Chromosomal walking enabled us to sequence the entire gene and its flanking regions. The primary sequence of the gene product is 78% identical to the RelA/SpoT homologue of Bacillus subtilis and both gene loci share a similar genetic organization. The B. stearothermophilus rel gene was analyzed in vivo by heterologous expression in the B. subtilis relA deletion strain TW30, and is shown to complement the growth defects of TW30. The recombinant RelBst protein was detected by Western immunoanalysis, and synthesizes guanosine-3'-diphosphate-5'-(tri)diphosphate ((p)ppGpp) after amino acid stress and carbon starvation. These in vivo data, the genetic organization, and the primary structure compared to other RelA/SpoT homologues provide circumstantial evidence that the identified gene encodes the only (p)ppGpp synthetase in B. stearothermophilus presumed to serve also as (p)ppGpp hydrolase.
authors.affiliation: Department of Chemistry, Philipps-University, Marburg, Germany.
authors.forename: T M
authors.initials: TM
authors.lastname: Wendrich
authors.forename: C L
authors.initials: CL
authors.lastname: Beckering
authors.forename: M A
authors.initials: MA
authors.lastname: Marahiel
mesh_terms: D001412:Bacillus subtilis / Q000235:genetics / Q000378:metabolism; D017353:Gene Deletion; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D001411:Geobacillus stearothermophilus / Q000201:enzymology* / Q000235:genetics* / Q000254:growth & development; D006158:Guanosine Pentaphosphate / Q000378:metabolism*; D008025:Ligases / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D011755:Pyrophosphatases / Q000235:genetics* / Q000378:metabolism; D017422:Sequence Analysis, DNA
chemical_list: D006158:Guanosine Pentaphosphate; C027627:guanosine-3',5'-bis(diphosphate) 3'-pyrophosphatase; D011755:Pyrophosphatases; D008025:Ligases; C028812:guanosine 3',5'-polyphosphate synthetases