1
|
Stakheev VV, Makhotkin MA, Grigoryeva OO, Kornienko SA, Makarikov AA, Panasjuk NV, Orlov VN. First Data on the Contact Zone and Hybridization between the Cryptic Species of Shrews Sorex araneus and S. satunini (Eulipotyphla, Mammalia). Dokl Biol Sci 2020; 494:251-254. [PMID: 33083884 DOI: 10.1134/s0012496620050099] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 05/27/2020] [Accepted: 05/28/2020] [Indexed: 06/11/2023]
Abstract
For the first time, based on sequence variation of microsatellite loci and the mtDNA cytb gene fragment, population genetic structure of the common shrew and Caucasian shrew in their contact zone was investigated. It was demonstrated that, although there was no complete reproductive isolation between the species under consideration, the gene flow was considerably limited. These data testify to the established reliable reproductive barriers between the common shrew and Caucasian shrew.
Collapse
Affiliation(s)
- V V Stakheev
- The Southern Scientific Centre of the Russian Academy of Sciences, 344006, Rostov-on-Don, Russia.
| | - M A Makhotkin
- The Southern Scientific Centre of the Russian Academy of Sciences, 344006, Rostov-on-Don, Russia
| | - O O Grigoryeva
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071, Moscow, Russia
| | - S A Kornienko
- Institute of Systematics and Ecology of Animals, Siberian Branch, Russian Academy of Sciences, 630091, Novosibirsk, Russia
| | - A A Makarikov
- Institute of Systematics and Ecology of Animals, Siberian Branch, Russian Academy of Sciences, 630091, Novosibirsk, Russia
| | - N V Panasjuk
- The Southern Scientific Centre of the Russian Academy of Sciences, 344006, Rostov-on-Don, Russia
| | - V N Orlov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 119071, Moscow, Russia
| |
Collapse
|
2
|
Abstract
SummaryThe shape of platelets in circulating blood and alterations of this shape after the contact of platelets with glass surfaces, as well as spontaneous platelet aggregation, were examined in patients with acute myocardial infarction (AMI) and in controls.The shape of circulating platelets were studied by scanning electron microscopy and the spreading - by differential interference contrast microscopy.Most platelets circulating in the blood of the patients with AMI had non-activated discoid shape; the percentage of these nonactivated platelets was similar to that in the control group. However, these platelets of many AMI patients acquired an increased ability to undergo morphological changes after contact with glass. The percentage of spread platelets in controls was never higher than 50%. In contrast, this percent was higher than 50% in 73% of patients with AMI. Increased spontaneous platelet aggregation was determined only in 30% of AMI patients.
Collapse
Affiliation(s)
- E J Vasilieva
- The Moscow Medical-Stomatological Institute, Moscow, USSR
| | - V N Orlov
- The Moscow Medical-Stomatological Institute, Moscow, USSR
| | - Z S Barkagan
- The Moscow Medical-Stomatological Institute, Moscow, USSR
| |
Collapse
|
3
|
Ivashkov OV, Sybachin AV, Efimova AA, Orlov VN, Pergushov DV, Schmalz H, Yaroslavov AA. Composition and properties of complexes between anionic liposomes and diblock copolymers with cationic and poly(ethylene oxide) blocks. POLYM INT 2017. [DOI: 10.1002/pi.5431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Oleg V Ivashkov
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Andrey V Sybachin
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Anna A Efimova
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Viktor N Orlov
- Research Institute of Physico-Chemical Biology; MV Lomonosov Moscow State University; Moscow Russia
| | - Dmitry V Pergushov
- Department of Chemistry; MV Lomonosov Moscow State University; Moscow Russia
| | - Holger Schmalz
- Makromolekulare Chemie II; Universität Bayreuth; Bayreuth Germany
| | | |
Collapse
|
4
|
Firsov AM, Kotova EA, Orlov VN, Antonenko YN, Skulachev VP. A mitochondria-targeted antioxidant can inhibit peroxidase activity of cytochromecby detachment of the protein from liposomes. FEBS Lett 2016; 590:2836-43. [DOI: 10.1002/1873-3468.12319] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/14/2016] [Accepted: 07/14/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Alexander M. Firsov
- Belozersky Institute of Physico-Chemical Biology; Lomonosov Moscow State University; Russia
- Department of Bioengineering and Bioinformatics; Lomonosov Moscow State University; Russia
| | - Elena A. Kotova
- Belozersky Institute of Physico-Chemical Biology; Lomonosov Moscow State University; Russia
| | - Viktor N. Orlov
- Belozersky Institute of Physico-Chemical Biology; Lomonosov Moscow State University; Russia
| | - Yuri N. Antonenko
- Belozersky Institute of Physico-Chemical Biology; Lomonosov Moscow State University; Russia
| | - Vladimir P. Skulachev
- Belozersky Institute of Physico-Chemical Biology; Lomonosov Moscow State University; Russia
- Department of Bioengineering and Bioinformatics; Lomonosov Moscow State University; Russia
| |
Collapse
|
5
|
Efimova AA, Kostenko SN, Orlov VN, Yaroslavov AA. Effect of cholesterol on the phase state and permeability of mixed liposomes composed of anionic diphosphatidylglycerol and zwitterionic dipalmitoylphosphatidylcholine. Mendeleev Communications 2016. [DOI: 10.1016/j.mencom.2016.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
6
|
Ivashkov OV, Sybachin AV, Efimova AA, Pergushov DV, Orlov VN, Schmalz H, Yaroslavov AA. The Influence of the Chain Length of Polycations on their Complexation with Anionic Liposomes. Chemphyschem 2015; 16:2849-2853. [DOI: 10.1002/cphc.201500474] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Indexed: 11/07/2022]
|
7
|
Grigoryeva OO, Borisova YM, Stakheev VV, Balakirev AE, Krivonogov DM, Orlov VN. [Genetic Structure of the Common Shrew Sorex araneus L. 1758 (Mammalia, Lipotyphla) in Continuous and Fragmented Areas]. Genetika 2015; 51:711-723. [PMID: 26310034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this work the genetic variability of the common shrew populations Sorex araneus L. in Eastern Europe was studied via sequencing of the mitochondrial gene cyt b. A total of 82 sequences of the mitochondrial gene cyt b with a length of 953 basepairs were analyzed, including five chromosome races in a continuous area of the species in forest zone and two races in fragmented area in the steppe zone. Phylogeographic subdivision of the common shrew was not expressed, and there was no significant correlation between genetic and geographic distances in continuous areas. We did not acquire convincing evidence of the influence of narrow hybrid zones between chromosome races on the flow of neutral alleles. A significant p-distance (0.69 ± 0.27%) of geographically close populations of the chromosome race Neroosa indicates the formation of the karyotype of this race in the Pliocene or Pleistocene. In our work, the phylogeographic structure was determined more by species area fragmentation than by its karyotypic features.
Collapse
|
8
|
Orlov VN, Shelova NA, Kulikova AG, Radzevich AE. Determination of the area of the periinfarction zone using the data of 35 ECG precordial leads. Adv Cardiol 2015; 28:228-30. [PMID: 6786010 DOI: 10.1159/000391995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
|
9
|
Sybachin AV, Zaborova OV, Orlov VN, Semenyuk PI, Ballauff M, Kesselman E, Schmidt J, Talmon Y, Menger FM, Yaroslavov AA. Complexes between anionic liposomes and spherical polycationic brushes. An assembly of assemblies. Langmuir 2014; 30:2441-2447. [PMID: 24533780 DOI: 10.1021/la4036248] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This paper has at its objective the assembling of liposomal assemblies onto nanoparticles. In this manner, one generates nanoparticles with a high loading capacity. Thus, spherical spherical polycationic "brushes" (SPBs) were synthesized by graft polymerizing a cationic monomer, (trimethylammonium)ethylmethacrylate chloride, onto the surface of monodisperse polystyrene particles, ca. 100 nm in diameter. These particles were complexed with small unilamellar anionic liposomes, 40-60 nm in diameter, composed of egg lecithin (EL) and anionic phosphatidylserine (PS(1-)) in PS(1-)/EL ratios from 0.10 to 0.54, a key parameter designated as ν. These complexes were then characterized according to electrophoretic mobility, dynamic light scattering, conductivity, fluorescence, and cryogenic transmission electron microscopy, with the following main conclusions: (a) All added liposomes are totally associated with SPBs up to a certain saturation concentration (specific for each ν value). (b) The number of liposomes per SPB particle varies from 40 (ν = 0.1) to 14 (ν = 0.5). (c) At sufficiently high liposome concentrations, the SPBs experience an overall change from positive to negative charge. (d) SPB complexes tend to aggregate when their initial positive charge has been precisely neutralized by the anionic liposomes. Aggregation is impeded by either positive charge at lower lipid concentrations, or negative charge at higher lipid concentrations. (e) The liposomes remain intact (i.e., do not leak) when associated with SPBs, at ν ≤ 0.5. (f) Complete SPB/liposome dissociation occurs at external [NaCl] = 0.3 M for ν = 0.1 and at 0.6 M for ν = 0.5. Liposomes with ν = 0.54 do not dissociate from the SPBs even in NaCl solutions up to 1.0 M. (g) Complexation of the PS(1-)/EL liposomes to the SPBs induces flip-flop of PS(1-) from the inner leaflet to the outer leaflet. (h) The differences in the ability of PS(1-) (a cylindrical lipid) and CL(2-) (a conical lipid) to create membranes defects are attributed to geometric factors.
Collapse
Affiliation(s)
- A V Sybachin
- Department of Chemistry, M.V. Lomonosov Moscow State University , Leninskie Gory 1-3, 119991 Moscow, Russian Federation
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Yaroslavov AA, Sybachin AV, Zaborova OV, Orlov VN, Ballauff M, Talmon Y, Menger FM. Lipid Segregation in Membranes of Anionic Liposomes Adsorbed onto Polycationic Brushes. Chemistry 2013; 19:13674-8. [DOI: 10.1002/chem.201301944] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Indexed: 11/07/2022]
|
11
|
Orlov VN, Borisov YM, Cherepanova EV, Milishnikov AN. Assortative mating in the hybrid zones of the common shrew (Sorex araneus mammalia) chromosome race West Dvina. Dokl Biol Sci 2013; 451:217-20. [PMID: 23975460 DOI: 10.1134/s0012496613040017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Indexed: 11/23/2022]
Affiliation(s)
- V N Orlov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 117071, Russia
| | | | | | | |
Collapse
|
12
|
Orlov VN, Sycheva VB, Cherepanova EV, Borisov IM. [Craniometric differences between karyotypic races of the common shrew Sorex araneus (Mammalia) as a result of limited hybridization]. Genetika 2013; 49:479-490. [PMID: 23866625 DOI: 10.7868/s0016675813040103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The contact points of four karyotypic races (St. Petersburg, Moscow, Seliger and West Dvina) of the common shrew Sorex araneus L. were studied at the Valdai Hills (European Russia) in an area unimpeded by geographic barriers. The populations of the races are separated by narrow hybrid zones that represent the most complex heterozygous hybrid karyotypes. At these points of contact, the morphometric differentiation of karyotype races was examined in 12 cranial measurements in 190 shrews of a known karyotype. A. comparison of the mean values in studied samples of immature shrews revealed statistically significant differences and the correlation of some measurements in order to describe the level of musculus temporalis. It has been proposed that morphometric differences in the karyotypic races were preserved and accumulated because of a 50% reduction of the frequencies of hybrids. The deviation from the Hardy-Weinberg ration in the frequencies of the genotype and haploid sets of chromosomes in the hybrid zones can be attributed to a number of fatalities of hybrid embryos or the nonrandom mating of karyotypic races. The ethological isolation might arise in the evolution of some karyotypic races from the reduced fitness of the hybrids.
Collapse
|
13
|
Grigoryeva OO, Oparin ML, Potapov SG, Orlov VN. The genetic structure of an isolated population of the common shrew Sorex araneus L. (Mammalia) as determined from microsatellite variation. Dokl Biol Sci 2012; 446:300-301. [PMID: 23129278 DOI: 10.1134/s0012496612050043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Indexed: 06/01/2023]
Affiliation(s)
- O O Grigoryeva
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia
| | | | | | | |
Collapse
|
14
|
Eroshenko LV, Marakhovskaya AS, Vangeli IM, Semenyuk PI, Orlov VN, Yaguzhinsky LS. Brønsted acids bounded to the mitochondrial membranes as a substrate for ATP synthase. DOKL BIOCHEM BIOPHYS 2012; 444:158-61. [PMID: 22773000 DOI: 10.1134/s160767291203009x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Indexed: 11/22/2022]
Affiliation(s)
- L V Eroshenko
- Belozerskii Institute of Physicochemical Biology, Moscow State University, Moscow 119991, Russia
| | | | | | | | | | | |
Collapse
|
15
|
Orlov VN, Borisov IM, Cherepanova EV, Grigor'eva OO, Shestak AG, Sycheva VB. [Narrow hybrid zone between Moscow and Western Dvina chromosomal races and specific features of population isolation in common shrew Sorex araneus (mammalia)]. Genetika 2012; 48:80-88. [PMID: 22567857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The contact zone between Moscow and Western Dvina chromosomal races of common shrew Sorex araneus L. at the south of the Valdai Hights was traced over a distance of 20 km. Within this, close to parapatric, contact zone of chromosomal races the width of sympatry zone was about 500 m (the narrowest among currently known hybrid zones), and the proportion of hybrids was 24.3%. It was shown that in bimodal hybrid zones between chromosomal races of common shrew the width of sympatry zones varied from 0.5 to 13 km. This width does not correlate with the cytogenetic features of the hybrids, and seems to be determined by competitive relations between the races. The hybrid proportion is determined by the type of hybrid heterozygosity, and decreased in the race sympatry zone from 33-40 to 21.5-25.2%. The decrease of the hybrid proportion can be associated with the abnormal fertility of either the first generation, or the backcross hybrids.
Collapse
|
16
|
Grigor'eva OO, Shestak AG, Potapov SG, Borisov IM, Irkhin SI, Korablev NP, Orlov VN. [The microsatellite polymorphism and gene flow in the contact zone of four common shrew (Sorex araneus L., Mammalia) chromosome races]. Izv Akad Nauk Ser Biol 2011:501-510. [PMID: 22117416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The variation of microsatellite loci in 130 individuals of four common shrew chromosome races (Moscow, Western Dvina, Seliger, and St. Petersburg) contacting on the Valdai Hills was studied. A low level of genetic differences between the chromosome races, which differ at three-five fixed diagnostic metacentric chromosomes, was found. The genetic differentiation within the races is more considerable as compared with that between the races. A high deficiency in heterozygotes was recorded; presumably, this is connected with regular variation in the population sizes. It is assumed that the fixation of centric chromosome fusions was supported by selection (drive) in the evolution of the common shrew against the background of a neutral evolution of the microsatellite loci.
Collapse
|
17
|
Moiseeva VS, Motovilov KA, Lobysheva NV, Orlov VN, Yaguzhinsky LS. The formation of metastable bond between protons and mitoplast surface. DOKL BIOCHEM BIOPHYS 2011; 438:127-30. [PMID: 21725889 DOI: 10.1134/s1607672911030069] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Indexed: 11/22/2022]
Affiliation(s)
- V S Moiseeva
- Belozerskii Institute of Physicochemical Biology, Moscow State University, Moscow, Russia
| | | | | | | | | |
Collapse
|
18
|
Orlov VN, Balakirev AE, Borisov IM. [Phylogenetic relationships of Caucasian shrew Sorex satunini Ogn. (mammalia) in the superspecies Sorex araneus inferred from the data of karyological analysis and the mtDNA cyt b gene sequencing]. Genetika 2011; 47:805-813. [PMID: 21866861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Using the data of karyological analysis, the phylogenetic relationships of Caucasian shrew Sorex satunini and the cryptic species of superspecies Sorer araneus were examined. In the population of Sorex satunini from the plain of North Ciscaucasia two deeply radiated cytochrome b genes (A and B) were identified. Genetic distance between haplotype A and B groups constituted 0.0675 +/- 0.008, which is higher than any distance in superspecies S. araneus. Possible introgression of type B haplotypes from the populations of the evolutionary lineage S. subaraneus--S. araneus in Pleistocene and the time of the appearance of the chromosomal polymorphism of S. araneus is discussed. Our results show that the use of only one mitochondrial marker can lead to false conclusions on taxonomic diversity
Collapse
|
19
|
Grigoryeva OO, Shestak AG, Sycheva VB, Potapov SG, Borisov YM, Orlov VN. Isolation effect in narrow hybrid zones of Sorex araneus chromosome races. DOKL BIOCHEM BIOPHYS 2011; 436:41-3. [PMID: 21369902 DOI: 10.1134/s1607672911010133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Indexed: 11/23/2022]
Affiliation(s)
- O O Grigoryeva
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow 119071, Russia
| | | | | | | | | | | |
Collapse
|
20
|
Trotsenko SN, Orlov VN, Damydiuk AP. [Hemorrhage in Dieulafoy disease as an example of an acute gastro-intestinal bleeding of uncertain etiology]. Klin Khir 2010:56. [PMID: 21294282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
|
21
|
Orlov VN, Trotsenko SN, Podroĭko II. [Dangers of diabetic pseudoperitonitis in practice of surgeon]. Klin Khir 2010:60-61. [PMID: 20862851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
|
22
|
Borisov YM, Kovaleva AA, Springer AM, Cherepanova EV, Kashtal'ian AP, Orlov VN. Hybrid origin of karyotypic variation in the common shrew, Sorex araneus (Mammalia), from the Dnieper River basin. Dokl Biol Sci 2010; 429:531-4. [PMID: 20170065 DOI: 10.1134/s0012496609060143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yu M Borisov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskiipr. 33, Moscow 119071, Russia
| | | | | | | | | | | |
Collapse
|
23
|
Milishnikov AN, Borroto R, Orlov VN. [Correlation between morphological and genetic differentiation in Cuban hutia (Rodentia, Capromyinae): species fragmentation on the area and the problem of excessive taxonomic status problem]. Genetika 2010; 46:218-225. [PMID: 20297656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The work attempts to explain the previously discovered phenomenon of excessive taxonomic status of the species and subspecies of Cuban hutias relative to their protein genetic divergence. The reasons underlying the fragmentary distribution of the species belonging to the family Capromyidae over the Antilles and Bahamas is also considered. Samples of four geographically distant hutia (genera Capromys and Mysateles) populations inhabiting different biotypes were assessed according to 32 allozyme loci. It has been demonstrated that the interpopulation and subspecies differentiation in the gene frequencies in these genera is very low. As for the pattern of polymorphism (Shannon?s measure), the populations and subspecies within these genera are well differentiated and adequate to their morphological differentiation. This suggests that the genetic divergence pattern of hutias in post-Pleistocene was predominantly determined by selection on the background of a relatively rapid formation of multiple morphotypes. It is assumed that the evolution within the family Capromyidae in the earlier and the later periods was associated with the geomorphological and climatic events in the history of the Earth. This standpoint provides for explaining the phenomena of both the excessive taxonomic status of the Cuban Capromyinae and the fragmentary distribution of these species over the Antilles and Bahamas, amazing at a first glance.
Collapse
|
24
|
Borisov YM, Kovaleva AA, Irkhin SY, Orlov VN. Zones of contact and joint occurrence of three chromosomal races of the common shrew Sorex araneus L. (Mammalia) in the southern Valdai Hills. Dokl Biol Sci 2009; 428:437-9. [PMID: 19994784 DOI: 10.1134/s0012496609050135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yu M Borisov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskiipr. 33, Moscow, 119071 Russia
| | | | | | | |
Collapse
|
25
|
Orlov VN, Trotsenko SN. [Universal suture technique in operative treatment of recurrent sygmoid colon volvulus in elderly and senile patients suffering severe concurrent diseases]. Klin Khir 2009:59-60. [PMID: 19957753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
|
26
|
Orlov VN, Koveshnikov AV, Podroĭko II, Trotsenko SN. [An acute gastric dilatation complicated by necrosis]. Klin Khir 2009:60-61. [PMID: 19673121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
|
27
|
Orlov VN, Kozlovskiĭ AI, Balakirev AE, Borisov IM. [Fixation of metacentric chromosomes in populations of the common shrew Sorex araneus L. from populations of Eastern Europe]. Genetika 2008; 44:581-593. [PMID: 18672791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
In this review, we discuss the processes of fixation of Robertsonian chromosome fusions in populations of the common shrew Sorex araneus L. Various Robertsonian fusions, accumulating in populations, create an illusion of large chromosomal rearrangements, reciprocal translocations of complete chromosome arms. The use of these rearrangements for phylogenetic reconstructions results in false conclusions. Robertsonian fusions accumulate in populations at such stages of the species evolution, when large open or subdivided populations prevail (populations of warm periods of Pleistocene and many present-day populations) and are fixed in small isolated populations and glacial refugia. The formation of monomorphic chromosome races requires a long time, several glaciation epochs during the whole Pleistocene.
Collapse
|
28
|
Balakirev AE, Baskevich MI, Gmyl' AP, Okulova NM, Andreeva TA, Sokolenko OV, Malygin VM, Khliap LA, Opatin ML, Orlov VN. [On the taxonomic rank of ciscaucasicus and its relationships with the pygmy wood mouse Sylvaemus uralensis inferred from the mtDNA cytochrome b gene sequence]. Genetika 2007; 43:1651-1666. [PMID: 18592692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
To specify the taxonomic rank of form ciscaucasoides (independent species Sylvaemus ciscaucasoides, or intraspecific form of pygmy wood mouse, S. uralensis), a 402-bp the mtDNA cytochrome b gene fragment (402 bp) was examined in S. ciscaucasoides individuals from six geographic localities of the Caucasus and Ciscaucasus, (Krasnodar krai and Adygeya Republic) and 17 S. uralensis individuals from seven localities of the Russian Plai (Saratov oblast, Smolensk oblast, Voronezh oblast, Tula oblast, Moscow oblast, and Tver' oblast). For comparison, the cytochrome b gene was partly sequenced in the samples of yellow necked, S. flavicollis (n = 2, Samara oblast), and Caucasian, S. ponticus (n = 6, Krasnodar krai), wood mice. One Mus musculus specimen from Western Europe, whose nucleotide sequences were deposed in the GenBank, was used as intergeneric outgroup. Phylogenetic trees for the forms examined were constructed based on the mtDNA sequence variation and using the neighbor joining and maximum parsimony methods. The network of the cytochrome b haplotypes was also constructed. The level of genetic divergence was evaluated using Kimura's two-parameter algorithm. Based on the data on the sequence variation in a 402-bp mtDNA cytochrome b gene fragment, the hypothesis on the species status of the ciscaucasicus form was. The mean intergroup distances (d) between the geographic groups of S. uralensis varied from 0.0036 to 0.0152. At the same time, the distances between the pygmy wood mice and the group of S.flavicollis-S. ponticus varies in the range from 0.0860 to 0.0935, and the level of intergeneric genetic differentiation (Sylvaemus-Mus) is higher than the latter index (d = 0.142). Ciscaucasoides should be considered as geographic substitution form of S. uralensis. Furthermore, the Caucasian populations of S. uralensis (= ciscaucasoides) were characterized by a threefold lower value of intergroup genetic divergence (d = 0.0062) than the East European populations (d= 0.0179). This finding pointed to some isolation of Caucasian populations of pygmy wood mouse and depletion of their gene pool. However other molecular genetic data (similarity of nucleotide composition and consistence of the levels of intra- and intergroup distances) suggest the absence of geographic subdivision between Caucasian and East European populations ofS. uralensis relative to the molecular marker examined.
Collapse
|
29
|
Orlov VN, Kozlovskii AI, Balakirev AE, Borisov YM. Endemic chromosome races of the common shrew Sorex araneus L. (Insectivora, Mammalia) and the possible preservation of refugia in the Late Valdai glaciation area. Dokl Biol Sci 2007; 416:396-9. [PMID: 18047030 DOI: 10.1134/s0012496607050225] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- V N Orlov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr 33, Moscow, 117071 Russia
| | | | | | | |
Collapse
|
30
|
Potapov SG, Illarionova NA, Andreeva TA, Baskevich MI, Okulova NM, Lavrenchenko LA, Orlov VN. Transfer of mitochondrial genome of the northern redbacked vole (Clethrionomys rutilus) to the bank vole (C. glareolus) in northwestern Europe. Dokl Biol Sci 2007; 417:435-438. [PMID: 18274484 DOI: 10.1134/s0012496607060075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- S G Potapov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow 117071, Russia
| | | | | | | | | | | | | |
Collapse
|
31
|
Orlov VN, Kozlovsky AI, Balakirev AE, Okulova NM, Irchin SY, Borisov YM. Chromosomal "system mutations" in the common shrew (Sorex araneus L., Insectivora) populations from the Upper Volga basin. Dokl Biol Sci 2007; 415:291-4. [PMID: 17929669 DOI: 10.1134/s0012496607040126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- V N Orlov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia
| | | | | | | | | | | |
Collapse
|
32
|
Orlov VN, Trotsenko SN, Podroĭko II. [An acute obturation intestinal obstruction, caused by biliary concrement]. Klin Khir 2007:56-57. [PMID: 18318074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
|
33
|
Iaitskiĭ NA, Amosov VI, Speranskaia AA, Sednev AV, Orlov VN, Vasil'eva MA. [Potentialities of multispiral computed tomography in the diagnostics of pathological alterations of the colon]. Vestn Khir Im I I Grek 2007; 166:48-56. [PMID: 18154095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The work describes an experience with using different methods of multispiral computed tomography in the diagnosis and differential diagnostics of pathological changes in the colon of patients of colonoproctological profile. Methodical variations of the computed tomography investigations are described in patients with localization of tumors in different parts of the intestine.
Collapse
|
34
|
Orlov VN, Kozboda AS, Kravchenko VV, Kalinina SA. [Using AELTIS-synchro-02 device in the therapy of chronic bacterial prostatitis]. Urologiia 2006:54-7. [PMID: 17058683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The treatment of chronic bacterial prostatitis combined antibacterial drugs and physiotherapy (low-energy laser radiation, electrostimulation of the prostate). Treatment of chronic bacterial prostatitis with medication and complex two-channel bio-synchronized electrolaser therapy with application of the unit AELTIS-synchro-02 raises efficacy of treatment with chronic bacterial prostatitis due to combined effect of antibacterial drugs and bacteriostatic and immunomodulating actions of the physical factors applied. These normalize microcirculation in the region of the prostatic gland, improve a draining function of the prostatic ducts, allows achievement of good results in 88.2% patients.
Collapse
|
35
|
Belousova IP, Orlov VN, Kudriavtsev IV. [Genealogic analysis of hereditary components of a metapopulation of Przhevalsky horse]. Genetika 2004; 40:261-266. [PMID: 15065435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The current condition of the megapopulation of the Przhevalsky horse was assessed using genetic indices of biological diversity of species and genealogical analysis and taking into account both nuclear and non-nuclear (mitochondrial), maternally inherited components of hereditary information.
Collapse
Affiliation(s)
- I P Belousova
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, 119071 Russia
| | | | | |
Collapse
|
36
|
Borisevich GV, Lebedev VN, Pashchenko II, Ruchko SV, Khamitov RA, Ionov SN, Maksimov VA, Orlov VN. [The use of monoclonal antibodies in studying the causative agents of viral hemorrhagic fevers]. Vopr Virusol 2003; 48:4-8. [PMID: 14598472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
The most promising trends of using monoclonal antibodies (Mabs) in virology research of the viral hemorrhagic-fevers' agents are related with studying viral antigen structure and with developing diagnostic preparations for indicating and identifying infectious agents of the mentioned pathologies. The methodological specificity of obtaining the Mabs to viral hemorrhagic-fevers' agents as well as data on its practical use are discussed.
Collapse
|
37
|
Orlov VN, Kozlovsky AI. The role of glacial epochs in the formation of chromosomal polymorphism in the common shrew Sorex araneus L. (Insectivora, Mammalia). Dokl Biol Sci 2002; 386:462-5. [PMID: 12469415 DOI: 10.1023/a:1020782805637] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- V N Orlov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 117071 Russia
| | | |
Collapse
|
38
|
Kaspieva OV, Nikolaeva OP, Orlov VN, Ponomarev MA, Drachev VA, Levitsky DI. Changes in the thermal unfolding of p-phenylenedimaleimide-modified myosin subfragment 1 induced by its 'weak' binding to F-actin. FEBS Lett 2001; 489:144-8. [PMID: 11165239 DOI: 10.1016/s0014-5793(01)02093-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Differential scanning calorimetry (DSC) was used to analyze the thermal unfolding of myosin subfragment 1 (S1) with the SH1 (Cys-707) and SH2 (Cys-697) groups cross-linked by N,N'-p-phenylenedimaleimide (pPDM-S1). It has been shown that F-actin affects the thermal unfolding of pPDM-S1 only at very low ionic strength, when some part of pPDM-S1 binds weakly to F-actin, but not at higher ionic strength (200 mM KCl). The weak binding of pPDM-S1 to F-actin shifted the thermal transition of pPDM-S1 by about 5 degrees C to a higher temperature. This actin-induced increase in thermal stability of pPDM-S1 was similar to that observed with 'strong' binding of unmodified S1 to F-actin. Our results show that actin-induced structural changes revealed by DSC in the myosin head occur not only upon strong binding but also on weak binding of the head to F-actin, thus suggesting that these changes may occur before the power-stroke and play an important role in the motor function of the head.
Collapse
Affiliation(s)
- O V Kaspieva
- A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia
| | | | | | | | | | | |
Collapse
|
39
|
Orlov VN, Arutyunyan AM, Kust SV, Litmanovich EA, Drachev VA, Dobrov EN. Macroscopic aggregation of tobacco mosaic virus coat protein. Biochemistry (Mosc) 2001; 66:154-62. [PMID: 11255122 DOI: 10.1023/a:1002835413371] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The relationship between processes of thermal denaturation and heat-induced aggregation of tobacco mosaic virus (TMV) coat protein (CP) was studied. Judging from differential scanning calorimetry "melting" curves, TMV CP in the form of a trimer-pentamer mixture ("4S-protein") has very low thermal stability, with a transition temperature at about 40 degrees C. Thermally denatured TMV CP displayed high propensity for large (macroscopic) aggregate formation. TMV CP macroscopic aggregation was strongly dependent on the protein concentration and solution ionic strength. By varying phosphate buffer molarity, it was possible to merge or to separate the denaturation and aggregation processes. Using far-UV CD spectroscopy, it was found that on thermal denaturation TMV CP subunits are converted into an intermediate that retains about half of its initial alpha-helix content and possesses high heat stability. We suppose that this stable thermal denaturation intermediate is directly responsible for the formation of TMV CP macroscopic aggregates.
Collapse
Affiliation(s)
- V N Orlov
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119899, Russia.
| | | | | | | | | | | |
Collapse
|
40
|
Kurganov BI, Kornilaev BA, Chebotareva NA, Malikov VP, Orlov VN, Lyubarev AE, Livanova NB. Dissociative mechanism of thermal denaturation of rabbit skeletal muscle glycogen phosphorylase b. Biochemistry 2000; 39:13144-52. [PMID: 11052666 DOI: 10.1021/bi000975w] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The thermal stability of rabbit skeletal muscle glycogen phosphorylase b was characterized using enzymological inactivation studies, differential scanning calorimetry, and analytical ultracentrifugation. The results suggest that denaturation proceeds by the dissociative mechanism, i.e., it includes the step of reversible dissociation of the active dimer into inactive monomers and the following step of irreversible denaturation of the monomer. It was shown that glucose 1-phosphate (substrate), glucose (competitive inhibitor), AMP (allosteric activator), FMN, and glucose 6-phosphate (allosteric inhibitors) had a protective effect. Calorimetric study demonstrates that the cofactor of glycogen phosphorylase-pyridoxal 5'-phosphate-stabilizes the enzyme molecule. Partial reactivation of glycogen phosphorylase b preheated at 53 degrees C occurs after cooling of the enzyme solution to 30 degrees C. The fact that the rate of reactivation decreases with dilution of the enzyme solution indicates association of inactive monomers into active dimers during renaturation. The allosteric inhibitor FMN enhances the rate of phosphorylase b reactivation.
Collapse
Affiliation(s)
- B I Kurganov
- A.N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky prospekt 33, Moscow 117071, Russian Federation
| | | | | | | | | | | | | |
Collapse
|
41
|
Levitsky DI, Rostkova EV, Orlov VN, Nikolaeva OP, Moiseeva LN, Teplova MV, Gusev NB. Complexes of smooth muscle tropomyosin with F-actin studied by differential scanning calorimetry. Eur J Biochem 2000; 267:1869-77. [PMID: 10712620 DOI: 10.1046/j.1432-1327.2000.01192.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Differential scanning calorimetry (DSC) and light scattering were used to analyze the interaction of duck gizzard tropomyosin (tropomyosin) with rabbit skeletal-muscle F-actin. In the absence of F-actin, tropomyosin, represented mainly by heterodimers, unfolds at 41 degrees C with a sharp thermal transition. Interaction of tropomyosin heterodimers with F-actin causes a 2-6 degrees C shift in the tropomyosin thermal transition to higher temperature, depending on the tropomyosin/actin molar ratio and protein concentration. A pronounced shift of the tropomyosin thermal transition was observed only for tropomyosin heterodimers, and not for homodimers. The most pronounced effect was observed after complete saturation of F-actin with tropomyosin molecules, at tropomyosin/actin molar ratios > 1 : 7. Under these conditions, two well-separated peaks of tropomyosin were observed on the thermogram besides the peak of F-actin, the peak characteristic of free tropomyosin heterodimer, and the peak with a maximum at 45-47 degrees C corresponding to tropomyosin bound to F-actin. By measuring the temperature-dependence of light scattering, we found that thermal unfolding of tropomyosin is accompanied by its dissociation from F-actin. Thermal unfolding of tropomyosin is almost completely reversible, whereas F-actin denatures irreversibly. The addition of tropomyosin has no effect on thermal unfolding of F-actin, which denatures with a maximum at 64 degrees C in the absence and at 78 degrees C in the presence of a twofold molar excess of phalloidin. After the F-actin-tropomyosin complex had been heated to 90 degrees C and then cooled (i.e. after complete irreversible denaturation of F-actin), only the peak characteristic of free tropomyosin was observed on the thermogram during reheating, whereas the thermal transitions of F-actin and actin-bound tropomyosin completely disappeared. Therefore, the DSC method allows changes in thermal unfolding of tropomyosin resulting from its interaction with F-actin to be probed very precisely.
Collapse
Affiliation(s)
- D I Levitsky
- A. N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Russia
| | | | | | | | | | | | | |
Collapse
|
42
|
Orlov VN, Bol'shakov VN, Okulova NM. [Analysis of discrete variability of rodents using equilibrium population properties]. Dokl Akad Nauk 1999; 369:841-6. [PMID: 10687055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
|
43
|
Abstract
Thermal denaturation of creatine kinase from rabbit skeletal muscle has been studied by differential scanning calorimetry. The excess heat capacity vs. temperature profiles were independent of protein concentration, but strongly temperature scanning rate-dependent. It has been shown that thermal denaturation of creatine kinase satisfies the previously proposed validity criteria for the two-state irreversible model [Kurganov et al., Biophys. Chem.70 (1997) 125]. The energy activation value has been calculated to be 461.0 +/- 0.7 kJ/mol.
Collapse
Affiliation(s)
- A E Lyubarev
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia
| | | | | | | |
Collapse
|
44
|
Bulatova NS, Bystrakova NV, Shchipanov NA, Orlov VN. [Karyologic differentiation in the common shrew Sorex araneus L. from the upper and middle Volga river basin (Insectivora, mammalia)]. Dokl Akad Nauk 1999; 366:416-9. [PMID: 10420262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
|
45
|
Potapov SG, Orlov VN, Koval'skaia IM, Malygin VM, Ryskov AP. [Genetic differentiation of voles of the tribe Arvicolini (Cricetidae, Rodentia) using taxonprint analysis and polymerase chain reaction with random primers]. Genetika 1999; 35:484-492. [PMID: 10420271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The variability of the genomes of ten vole species was analyzed by means of taxonomic DNA fingerprinting and polymerase chain reaction using random primers (RAPD-PCR). The dendrograms of genetic similarity between the representatives of the tribe Arvicolinae (Gray, 1821) were constructed, based on the data obtained by means of both methods. The topology of the genetic similarity dendrogram that is based on the RAPD-PCR data generally correlates with the genetic distances estimated from biochemical and karyological data. The results did not confirm the genus status of Terricola. On the other hand, the data from taxonprint analysis suggest the recognition of Lasiopodomys as a separate genus.
Collapse
Affiliation(s)
- S G Potapov
- Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia
| | | | | | | | | |
Collapse
|
46
|
Orlov VN, Rostkova EV, Nikolaeva OP, Drachev VA, Gusev NB, Levitsky DI. Thermally induced chain exchange of smooth muscle tropomyosin dimers studied by differential scanning calorimetry. FEBS Lett 1998; 433:241-4. [PMID: 9744803 DOI: 10.1016/s0014-5793(98)00923-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The thermal unfolding of duck gizzard tropomyosin dimers, alphabeta, alphaalpha, and betabeta, and of a 1:1 mixture of alphaalpha and betabeta homodimers was studied by differential scanning calorimetry (DSC). Both alphaalpha and betabeta homodimers demonstrated a broad thermal transition with maxima at 37.4 degrees C and 44.6 degrees C, respectively. However, a sharp cooperative thermal transition at 41.5 degrees C characteristic for alphabeta heterodimer appeared on the thermogram of the mixture of homodimers. The appearance of this transition was prevented by disulfide cross-linking of polypeptide chains in the homodimers. Thus, DSC studies clearly demonstrate formation of tropomyosin heterodimers during heating of the mixture of homodimers and in agreement with earlier published reports indicate thermally induced chain exchange between tropomyosin dimers.
Collapse
Affiliation(s)
- V N Orlov
- A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow, Russia.
| | | | | | | | | | | |
Collapse
|
47
|
Orlov VN, Kust SV, Kalmykov PV, Krivosheev VP, Dobrov EN, Drachev VA. A comparative differential scanning calorimetric study of tobacco mosaic virus and of its coat protein ts mutant. FEBS Lett 1998; 433:307-11. [PMID: 9744816 DOI: 10.1016/s0014-5793(98)00924-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The differential scanning calorimetry (DSC) 'melting curves' for virions and coat proteins (CP) of wild-type tobacco mosaic virus (strain U1) and for its CP ts mutant ts21-66 were measured. Strain U1 and ts21-66 mutant (two amino acid substitutions in CP: 121 --> T and D66 --> G) differ in the type of symptoms they induce on some host plants. It was observed that CP subunits of both U1 and ts21-66 at pH 8.0, in the form of small (3-4S) aggregates, possess much lower thermal stability than in the virions. Assembly into the virus particles resulted in a DSC melting temperature increase from 41 to 72 degrees C for U1 and from 38 to 72 degrees C for ts21-66 CP. In the RNA-free helical virus-like protein assemblies U1 and ts21-66 CP subunits had a thermal stability intermediate between those in 3-4S aggregates and in the virions. ts21-66 helical protein displayed a somewhat lower thermal stability than U1.
Collapse
Affiliation(s)
- V N Orlov
- A.N. Belozersky Institute of Physical and Chemical Biology, Moscow State University, Russia
| | | | | | | | | | | |
Collapse
|
48
|
Abstract
Thermal denaturation of uridine phosphorylase from Escherichia coli K-12 has been studied by differential scanning calorimetry. The excess heat capacity vs. temperature profiles were obtained at temperature scanning rates of 0.25, 0.5, and 1 K/min. These profiles were analysed using three models of irreversible denaturation which are approximations to the whole Lumry-Eyring model, namely, the one-step model of irreversible denaturation, the Lumry-Eyring model with the fast equilibrating first step, and the model involving two consecutive irreversible steps. In terms of statistics the latter model describes the kinetics of thermal denaturation of uridine phosphorylase more satisfactorily than the two other models. The values of energy activation for the first and second steps calculated for the model involving two consecutive irreversible steps are the following: Ea,1 = 609.3 +/- 1.8 kJ/mol and Ea,2 = 446.8 +/- 3.2 kJ/mol.
Collapse
Affiliation(s)
- A E Lyubarev
- Bach Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russian Federation
| | | | | | | |
Collapse
|
49
|
Levitsky DI, Nikolaeva OP, Orlov VN, Pavlov DA, Ponomarev MA, Rostkova EV. Differential scanning calorimetric studies on myosin and actin. Biochemistry (Mosc) 1998; 63:322-33. [PMID: 9526129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This review is concerned with the application of the method of differential scanning calorimetry (DSC) to structural and functional studies of myosin and actin--the main two proteins of muscles and many other systems of biological motility. The domain organization of these proteins as revealed by DSC is considered. Data are presented on the conformational changes which occur in the myosin head and in F-actin due to the formation of the ternary complexes with ADP and Pi analogs (such as orthovanadate, beryllium fluoride, or aluminum fluoride). Recent data on the application of DSC to studies on the interaction of F-actin with myosin heads and with tropomyosin are also considered. It is concluded that DSC offers a new and promising approach to probe the structural changes which occur in the myosin head and in F-actin during ATP hydrolysis and due to interaction of these proteins with each other.
Collapse
Affiliation(s)
- D I Levitsky
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119899 Russia
| | | | | | | | | | | |
Collapse
|
50
|
Liubarev AE, Kurganov BI, Burlakova AA, Orlov VN, Poglazov BF. [Differential scanning calorimetric study of irreversible heat denaturation of uridine phosphorylase from Escherichia coli K-12]. Dokl Akad Nauk 1998; 358:830-2. [PMID: 9541810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|