title: Structural attributes of nucleotide sequences in promoter regions of supercoiling-sensitive genes: how to relate microarray expression data with genomic sequences.
abstract: The level of supercoiling in the chromosome can affect gene expression. To clarify the basis of supercoiling sensitivity, we analyzed the structural features of nucleotide sequences in the vicinity of promoters for the genes with expression enhanced and decreased in response to loss of chromosomal supercoiling in Escherichia coli. Fourier analysis of promoter sequences for supercoiling-sensitive genes reveals the tendency in selection of sequences with helical periodicities close to 10nt for relaxation-induced genes and to 11nt for relaxation-repressed genes. The helical periodicities in the subsets of promoters recognized by RNA polymerase with different sigma factors were also studied. A special procedure was developed for the study of correlations between the intensities of periodicities in promoter sequences and the expression levels of corresponding genes. Significant correlations of expression with the AT content and with AT periodicities about 10, 11, and 50nt indicate their role in regulation of supercoiling-sensitive genes.
authors.affiliation: Engelhardt Institute of Molecular Biology of Russian Academy of Sciences, Russia. gk@eimb.ru
authors.forename: Galina I
authors.initials: GI
authors.lastname: Kravatskaya
authors.forename: Vladimir R
authors.initials: VR
authors.lastname: Chechetkin
authors.forename: Yury V
authors.initials: YV
authors.lastname: Kravatsky
authors.forename: Vladimir G
authors.initials: VG
authors.lastname: Tumanyan
mesh_terms: D001483:Base Sequence; D004269:DNA, Bacterial / Q000737:chemistry* / Q000378:metabolism; D004278:DNA, Superhelical / Q000737:chemistry / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D009690:Nucleic Acid Conformation; D020411:Oligonucleotide Array Sequence Analysis; D011401:Promoter Regions, Genetic; D017422:Sequence Analysis, DNA; D012808:Sigma Factor / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D004269:DNA, Bacterial; D004278:DNA, Superhelical; D012808:Sigma Factor