Anna S. Karyagina

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The regulation of the Sso II restriction-modification system from Shigella sonnei was studied in vivo and in vitro . In lacZ fusion experiments, Sso II methyltransferase (M. Sso II) was found to repress its own synthesis but stimulate expression of the cognate restriction endonuclease (ENase). The N-terminal 72 amino acids of M. Sso II, predicted to form a(More)
The Nucleic acid-Protein Interaction DataBase ( contains information derived from structures of DNA-protein and RNA-protein complexes extracted from the Protein Data Bank (3846 complexes in October 2012). It provides a web interface and a set of tools for extracting biologically meaningful characteristics of nucleoprotein(More)
Standard Affymetrix technology evaluates gene expression by measuring the intensity of mRNA hybridization with a panel of the 25-mer oligonucleotide probes, and summarizing the probe signal intensities by a robust average method. However, in many cases, signal intensity of the probe does not correlate with gene expression. This could be due to the(More)
UNLABELLED The database NPIDB (Nucleic Acids-Protein Interaction DataBase) contains information derived from structures of DNA-protein and RNA-protein complexes extracted from PDB (1834 complexes in July 2007). It is organized as a collection of files in PDB format and is equipped with a web-interface and a set of tools for extracting biologically(More)
Heterocyclic bases and phosphate groups involved in the DNA–methyltransferase SsoII (M · SsoII) interaction were identified in the regulatory DNA region localized within the promoter region of the SsoII restriction–modification genes by footprinting with the use of formic acid, hydrazine, dimethyl sulfate, and N-ethyl-N-nitrosourea as modifying agents. It(More)
The genes encoding SsoI and SsoII restriction endonuclease (ENase) and methyltransferase (MTase) are located on the small plasmids P6 and P4, respectively, of Shigella sonnei strain 47. Functions provided by plasmids P5, P7 and P9, which include colicinogenicity and immunity to colicin E1, resistance to streptomycin (Sm), and conjugative DNA transfer,(More)
Release factor eRF1 plays a key role in the termination of protein synthesis in eukaryotes. The eRF1 consists of three domains (N, M and C) that perform unique roles in termination. Previous studies of eRF1 point mutants and standard/variant code eRF1 chimeras unequivocally demonstrated a direct involvement of the highly conserved N-domain motifs (NIKS,(More)
The functional groups of the DNA methylation site that are involved in the DNA interaction with methyltransferase SsoII at the recognition stage were identified. The contacts in the enzyme–substrate complex were analyzed in the presence of S-adenosyl-L-homocysteine using the interference footprinting assay with formic acid, hydrazine, dimethyl sulfate, or(More)
(Cytosine-5)-DNA methyltransferase SsoII (M.SsoII) has a long N-terminal region (1–71 residues) preceding the sequence with conservative motifs, which are characteristic for all DNA methyltrans-ferases of such kind. The presence of this region provides M.SsoII capability to act as a transcription regulator in SsoII restriction-modification system. To(More)
Overproduction of the NlaX DNA methyltransferase (M.NlaX) in an Escherichia coli host conferred resistance to SsoII restriction endonuclease (R.SsoII) digestion. This suggested an overlap of sequence specificity between M.NlaX and M.SsoII, the latter of which modifies the internal cytosine of the target sequence 5'-CCNGG-3'. A variant of M.NlaX (M.Sso/Nla),(More)