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Shatsky, Ivan N.,Dmitriev, Sergey E.,Terenin, Ilya M.,Andreev, D.E. Korean Society for Molecular and Cellular Biology 2010 Molecules and cells Vol.30 No.4
During the last decade the concept of cellular IRES-elements has become predominant to explain the continued expression of specific proteins in eukaryotic cells under conditions when the cap-dependent translation initiation is inhibited. However, many cellular IRESs regarded as cornerstones of the concept, have been compromised by several recent works using a number of modern techniques. This review analyzes the sources of artifacts associated with identification of IRESs and describes a set of control experiments, which should be performed before concluding that a 5' UTR of eukaryotic mRNA does contain an IRES. Hallmarks of true IRES-elements as exemplified by well-documented IRESs of viral origin are presented. Analysis of existing reports allows us to conclude that there is a constant confusion of the cap-independent with the IRES-directed translation initiation. In fact, these two modes of translation initiation are not synonymous. We discuss here not numerous reports pointing to the existence of a cap- and IRES-independent scanning mechanism of translation initiation based on utilization of special RNA structures called cap-independent translational enhancers (CITE). We describe this mechanism and suggest it as an alternative to the concept of cellular IRESs.
Ivan N. Shatsky,Sergey E. Dmitriev,Ilya M. Terenin,D.E. Andreev 한국분자세포생물학회 2010 Molecules and cells Vol.30 No.4
During the last decade the concept of cellular IRESelements has become predominant to explain the continued expression of specific proteins in eukaryotic cells under conditions when the cap-dependent translation initiation is inhibited. However, many cellular IRESs regarded as cornerstones of the concept, have been compromised by several recent works using a number of modern techniques. This review analyzes the sources of artifacts associated with identification of IRESs and describes a set of control experiments, which should be performed before concluding that a 5′ UTR of eukaryotic mRNA does contain an IRES. Hallmarks of true IRES-elements as exemplified by well-documented IRESs of viral origin are presented. Analysis of existing reports allows us to conclude that there is a constant confusion of the cap-independent with the IRES-directed translation initiation. In fact, these two modes of translation initiation are not synonymous. We discuss here not numerous reports pointing to the existence of a cap- and IRES-independent scanning mechanism of translation initiation based on utilization of special RNA structures called cap-independent translational enhancers (CITE). We describe this mechanism and suggest it as an alternative to the concept of cellular IRESs.
Kushch, L. A.,Sasnovskaya, V. D.,Dmitriev, A. I.,Yagubskii, E. B.,Koplak, O. V.,Zorina, L. V.,Boukhvalov, D. W. The Royal Society of Chemistry 2012 Dalton Transactions Vol.41 No.44
<P>A new high symmetry Mn<SUB>12</SUB> oxocarboxylate cluster [Mn<SUB>12</SUB>O<SUB>12</SUB>(CN-<I>o</I>-C<SUB>6</SUB>H<SUB>4</SUB>CO<SUB>2</SUB>)<SUB>12</SUB>(CH<SUB>3</SUB>CO<SUB>2</SUB>)<SUB>4</SUB>(H<SUB>2</SUB>O)<SUB>4</SUB>]·8CH<SUB>2</SUB>Cl<SUB>2</SUB> (<B>1</B>) with mixed carboxylate ligands is reported. It was synthesized by the standard carboxylate substitution method. <B>1</B> crystallizes in the tetragonal space group <I>I</I>4<SUB>1</SUB>/<I>a</I>. Complex <B>1</B> contains a [Mn<SUB>12</SUB>O<SUB>12</SUB>] core with eight CN-<I>o</I>-C<SUB>6</SUB>H<SUB>4</SUB>CO<SUB>2</SUB> ligands in the axial positions, four CH<SUB>3</SUB>CO<SUB>2</SUB> and four CN-<I>o</I>-C<SUB>6</SUB>H<SUB>4</SUB>CO<SUB>2</SUB> in equatorial positions. Four H<SUB>2</SUB>O molecules are bonded to four Mn atoms in an alternating up, down, up, down arrangement indicating a 1 : 1 : 1 : 1 isomer. The Mn<SUB>12</SUB> molecules in <B>1</B> are self-assembled by complementary hydrogen C–H⋯N bonds formed with participation of the axial <I>o</I>-cyanobenzoate ligands of the adjacent Mn<SUB>12</SUB> clusters. The lattice solvent molecules (CH<SUB>2</SUB>Cl<SUB>2</SUB>) are weakly interacted with Mn<SUB>12</SUB> units that results in solvent loss immediately after removal of the crystals from the mother liquor. The electronic structure and the intramolecular exchange parameters have been calculated. Mn 3d bands of <B>1</B> are rather broad, and the center of gravity of the bands shifts down from the Fermi level. The overlap between Mn 3d bands and 2p ones of the oxygen atoms from the carboxylate bridges is higher than in the parent Mn<SUB>12</SUB>-acetate cluster. These changes in the electronic structure provide a significant difference in the exchange interactions in comparison to Mn<SUB>12</SUB>-acetate. The magnetic properties have been studied on a dried (solvent-free) polycrystalline sample of <B>1</B>. The dc magnetic susceptibility measurements in the 2–300 K temperature range support a high-spin ground state (<I>S</I> = 10). A bifurcation of temperature dependencies of magnetization taken under zero field cooled and field cooled conditions observed below 4.5 K is due to slow magnetization relaxation. Magnetization <I>versus</I> applied dc field exhibited a stepwise hysteresis loop at 2 K. The ac magnetic susceptibility data revealed the frequency dependent out-of-phase (<I>χ</I><SUB>M</SUB>′′) signals characteristic of single-molecule magnets.</P> <P>Graphic Abstract</P><P>New high symmetry Mn<SUB>12</SUB> SMM with four CH<SUB>3</SUB>CO<SUB>2</SUB> and four CN-<I>o</I>-C<SUB>6</SUB>H<SUB>4</SUB>CO<SUB>2</SUB> ligands in equatorial positions and eight CN-<I>o</I>-C<SUB>6</SUB>H<SUB>4</SUB>CO<SUB>2</SUB> in axial ones is synthesized and characterized. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2dt31173a'> </P>
ACTIVATION ANALYSIS OF ENVIRONMENTAL SAMPLES USING THE MT-25 MICROTRON OF THE FLNR
Maslov, O.D.,Belov, A.G.,Starodub, G.Ya.,Dmitriev, S.N. The Korean Society of Analytical Sciences 1995 분석과학 Vol.8 No.4
Instrumental neutron and gamma activation analysis of coal and combustion products, determination of platinum content in natural samples by radiochemical gamma activation analysis and high-sensitive track method of thorium determination has been studied with the use of the MT-25 microtron.The optimal conditions for complete elemental analysis of coal and combustion products, isolation and determination of platinum and thorium are recommended.
Hepatitis C in Ethnic Minority Populations in Ha Giang Province, Vietnam
( Lichnaia E. ),( Bui Thi Thanh Nga ),( Pham Thi Ha Giang ),( Starkova D. ),( Petrova O. ),( Bui Thi Lan Anh ),( Tran Thi Nhai ),( Vo Viet Cuong ),( Pham Ngoc Quang ),( Dmitriev A. ),( Kalinina O. ) 대한간학회 2023 춘·추계 학술대회 (The Liver Week) Vol.2023 No.1