Andrey L. Mikheikin

Learn More
Although gel-based microchips offer significant advantages over two-dimensional arrays, their use has been impeded by the lack of an efficient manufacturing procedure. Here we describe two simple, fast, and reproducible methods of fabrication of DNA gel drop microchips. In the first, copolymerization method, unsaturated groups are chemically attached to(More)
Gel-based oligonucleotide microarray approach was developed for quantitative profiling of binding affinity of a protein to single-stranded DNA (ssDNA). To demonstrate additional capabilities of this method, we analyzed the binding specificity of ribonuclease (RNase) binase from Bacillus intermedius (EC to ssDNA using generic hexamer(More)
Flexible polymer linkers play an important role in various imaging and probing techniques that require surface immobilization, including atomic force microscopy (AFM). In AFM force spectroscopy, polymer linkers are necessary for the covalent attachment of molecules of interest to the AFM tip and the surface. The polymer linkers tether the molecules and(More)
To assess the DNA amount in samples (e.g., in biological microchip gel pads) by means of fluorescent dyes, one should use the dyes whose fluorescence weakly depends on DNA composition and structure. With the ImD-310 dye created for this purpose, we have analyzed the staining of single- and double-stranded oligo- and polynucleotides of different nucleotide(More)
This study is a continuation of a series of papers dealing with topotecan interaction with double-stranded polydeoxyribonucleotides. We showed earlier that topotecan molecules form dimers in solution at concentration above 10–5(per base pair). Topotecan interaction with calf thymus DNA in solutions of low ionic strength was studied by fluorescence, circular(More)
Unusual DNA conformations including cruciforms play an important role in gene regulation and various DNA transactions. Cruciforms are also the models for Holliday junctions, the transient DNA conformations critically involved in DNA homologous and site-specific recombination, repair, and replication. Although the conformations of immobile Holliday junctions(More)
We have biochemically characterized the bacterial-like DnaG primase contained within the hyperthermophilic crenarchaeon Sulfolobus solfataricus (Sso) and compared in vitro priming kinetics with those of the eukaryotic-type primase (PriSL) also found in Sso. SsoDnaG exhibited metal- and temperature-dependent profiles consistent with priming at high(More)
DNA polymerases are essential enzymes in all domains of life for both DNA replication and repair. The primary DNA replication polymerase from Sulfolobus solfataricus (SsoDpo1) has been shown previously to provide the necessary polymerization speed and exonuclease activity to replicate the genome accurately. We find that this polymerase is able to physically(More)
Optical methods, such as fluorescence, circular dichroism and linear flow dichroism, were used to study the binding to DNA of four symmetrical cyanine dyes, each consisting of two identical quinoline, benzthiazole, indole, or benzoxazole fragments connected by a trimethine bridge. The ligands were shown to form a monomer type complex into the DNA minor(More)
Interaction of topotecan (TPT) with calf thymus DNA, coliphage T4 DNA, and poly(dGdC) · poly(dG-dC) was studied by optical (linear flow dichroism, UV-vis spectroscopy) and quantum chemical methods. The linear dichroism signal of TPT bound to DNA was shown to have positive sign in the range 260–295 nm. This means that the plane of quinoline fragment (rings A(More)