Transcription at different salinities of Haloferax mediterranei sequences adjacent to partially modified PstI sites.
Two genomic sequences from the halophilic archaeon Haloferax mediterranei, where we had found PstI restriction-pattern modifications depending on the salinity of the growth medium, have been studied. A markedly salt-dependent differential expression has been detected in the nearby regions. Two of the open reading frames characterized correspond to two of the differentially expressed transcripts. In both cases the PstI sites were included in purine-pyrimidine alternancies suggestive of Z-DNA structures and located in non-coding regions with frequent repetitive motifs. A long alternating adenine-thymine tract also appears in the upstream regions of one of these open reading frames. A possible role of local DNA configuration in osmoregulation in this organism is discussed.
Mojica
F J
FJ
Departamento de Genética Molecular y Microbiología, Universidad de Alicante, Spain.
Juez
G
G
Rodríguez-Valera
F
F
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D015252:Deoxyribonucleases, Type II Site-Specific; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects*; D016680:Genome, Bacterial; D016931:Halobacteriales / Q000235:genetics*; D008969:Molecular Sequence Data; D016366:Open Reading Frames / Q000235:genetics; D009994:Osmolar Concentration; D012322:RNA Precursors / Q000235:genetics*; D012492:Salts / Q000494:pharmacology*; D012623:Seawater; D017422:Sequence Analysis, DNA; D013379:Substrate Specificity; D014158:Transcription, Genetic / Q000187:drug effects*
D012322:RNA Precursors; D012492:Salts; C024388:CTGCAG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific