Translational in vitro activity of the 3a gene and the coat protein gene derived from brome mosaic virus RNA 3 by site-specific cleavage with RNase H

AbstractTwo translationally active fragments were derived from the dicistronic Brome Mosaic Virus (BMV) RNA 3 by site-specific cleavage with RNase H from E.coli: the 5′-proximal (L)fragment encoding the 32 kDa protein and the 3′-proximal (Sh) fragment carrying the coat protein gene. The translational efficiency of the L- and Sh-fragments was compared with those of the native BMV RNA 3 and RNA 4, encoding the 32 kDa and coat proteins, respectively. The Sh-fragment template activity was similar to that of RNA 4, although it was uncapped and contained 20–22 additional 5′-terminal nucleotides in comparison with BMV RNA 4

Идентификация белков плазмы крови человека с использованием внутренних пептидных стандартов в панорамном протеомном анализе

LC-MS/MS allows identification of thousands of proteins in the complex proteomes. However, a significant part of a proteome remains inaccessible for identification due to the absence or poor quality of MS/MS spectra. The method described herein allows identifying the desired proteins of human blood plasma by comparing aligned chromatographic data of digested by trypsin sample and the same sample with spikedin synthetic peptides. Identification of human blood plasma proteins is archived by assigning tandem mass spectra of spiked-in peptides to the corresponding aligned chromatographic peaks of proteolytic peptides. Using the described approach we have identified 19 low abundant proteins in human blood plasma, which corresponded to 19 synthetic peptides used in the study. SRM verification of the identifications with isotopically labelled standards (SIS) confirmed the presence in the plasma of above 17 proteins.Использование метода панорамной жидкостной хроматографии-масс-спектрометрии (ЖХ-МС/МС) позволяет идентифицировать в сложных протеомах до нескольких тысяч белков. Однако значительная часть протеома остается недоступной для идентификации из-за отсутствия или плохого качества МС/МС спектров. Описываемый в данной работе метод повышает вероятность идентификации белков плазмы крови человека путем выравнивания хроматографических данных образца смеси протеолитических пептидов и этого же образца, разбавленного синтетическими пептидами. Такая идентификация происходит в результате сопоставления тандемных масс-спектров синтетических пептидов с соответствующими выровненными хроматографическими пиками протеолитических пептидов. Используя данный подход, мы выявили 19 низко представленных белков плазмы крови человека, соответствующих 19 синтетическим пептидам, выбранным для исследования. Проверка идентификаций методом мониторинга диссоциативных переходов с изотопно-мечеными стандартами подтвердила наличие в плазме 17 белков

Translation enhancing properties of the 5′-leader of potato virus X genomic RNA

AbstractThe double-stranded DNA copy corresponding to the 5′-nontranslated αβ-leader of potato virus X (PVX) genomic RNA (positions −3 to −85 according to AUG initiator) was chemically synthesized and fused to the transcription plasmids containing three different reporter genes: neomycinphosphotransferase type II (NPT II) gene, Bacillus thuringiensis coleopteran-specific toxic protein gene and β-glucuronidase (GUS) gene. Expression of the reporter genes in vitro and in plant protoplasts (in the case of GUS gene) reveals that the αβ-leader of PVX RNA acts as a translation enhancer despite the presence of the upstream vector-derived sequence and irrespective of the length of the spacer sequence preceding the reporter genes

Manufacture and study of new polystyrene scintillators

The main optical characteristics and radiation hardness of new polystyrene scintillator UPS98GC were studied. The scintillator UPS-98GC was compared to SCSN-81, produced by Kuraray Co. which is often used in high-energy physics experiments. The dependence of scintillator properties on radiation dose rates as well as on total dose values was studied. It is shown that for relatively small dose rates closed to those expected during scintillator lifetime, our UPS98GC does not yield to SCSN-81