Abstract:
:Helicases are ubiquitous essential enzymes which have significant role in the nucleic acid metabolism. Using in silico approaches in the recent past we have identified a number of helicases in the Plasmodium falciparum genome. In the present study we report purification and detailed characterization of a novel helicase from P. falciparum. Our results indicate that this helicase is a homologue of Dbp5 and DDX19 from yeast and human, respectively. The biochemical characterization shows that it contains DNA and RNA unwinding, nucleic acid dependent ATPase and RNA binding activities. It is interesting to note that this enzyme can unwind DNA duplexes in both 5' to 3' and 3' to 5' directions. Using truncated derivatives we further show that Q motif is essentially required for all of its activities. These studies should make an important contribution in understanding the enzymes involved in nucleic acid metabolism in the parasite.
journal_name
Mol Biochem Parasitoljournal_title
Molecular and biochemical parasitologyauthors
Mehta J,Tuteja Rdoi
10.1016/j.molbiopara.2010.12.003subject
Has Abstractpub_date
2011-03-01 00:00:00pages
58-63issue
1eissn
0166-6851issn
1872-9428pii
S0166-6851(10)00319-1journal_volume
176pub_type
杂志文章abstract::The mechanism controlling transcription at several telomeric expression sites for variable surface glycoprotein (VSG) genes in Trypanosoma brucei is unknown. Most VSG genes in expression sites have a region 5' of the gene lacking restriction enzyme sites. This 'barren region' is involved in recombination events which ...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(87)90103-4
更新日期:1987-06-01 00:00:00
abstract::Glucose is a major source of energy and carbon in promastigotes of Leishmania mexicana, and its uptake is mediated by three glucose transporters whose genes are encoded within a single cluster. A null mutant in which the glucose transporter gene cluster was deleted by homologous gene replacement was generated previous...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2007.01.010
更新日期:2007-05-01 00:00:00
abstract::Hamsters infected with Opisthorchis viverrini, a liver fluke of man, showed an increased deposition of collagen in their livers. However, increased collagen breakdown as well as its synthesis were observed in the infected livers. Thus, stimulated synthesis might be the main factor responsible for the net increase in c...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(83)90035-x
更新日期:1983-05-01 00:00:00
abstract::In trypanosomes, trans-splicing is a major essential RNA-processing mechanism that involves the addition of a spliced leader sequence to all mRNAs from a small RNA species, known as the spliced leader RNA (SL RNA). SL RNA maturation is poorly understood and it is not clear where assembly with Sm proteins takes place. ...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2006.07.004
更新日期:2006-12-01 00:00:00
abstract::The telomeric sequence cloned from Plasmodium berghei (see M. Ponzi et al. (1985) EMBO J. 4, 2991-2995) was tested for species specificity. A telomeric and a subtelomeric fragment of the cloned insert served as separate, labelled probes on pulsed field gradient electrophoretical patterns and on genomic digests from th...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(86)90015-0
更新日期:1986-11-01 00:00:00
abstract::Schistosoma mansoni is a major causative agent of schistosomiasis, an important parasitic disease that constitutes a severe health problem in developing countries. Even though an effective treatment exists, it does not prevent re-infection and the development of an effective vaccine still remains the most desirable me...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2009.02.006
更新日期:2009-07-01 00:00:00
abstract::DNA processes, including transcriptional activation, are largely governed by histone modifications. For most eukaryotes, chromatin-remodeling machines have been identified that move, replace, or decorate histones. Recent studies have shed some important light on similar machinery operating in apicomplexan parasites, i...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章,评审
doi:10.1016/j.molbiopara.2006.03.010
更新日期:2006-08-01 00:00:00
abstract::The phylum Nematoda comprises a diverse group of roundworms that includes parasites of vertebrates, invertebrates, and plants. Human-parasitic nematodes infect more than one billion people worldwide and cause some of the most common neglected tropical diseases, particularly in low-resource countries [1]. Parasitic nem...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章,评审
doi:10.1016/j.molbiopara.2016.05.007
更新日期:2016-07-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(83)90023-3
更新日期:1983-03-01 00:00:00
abstract::Cystic hydatid disease (CHD) is caused by infection with Echinococcus granulosus metacestodes and affects humans and livestock. Proteins secreted or excreted by protoscoleces, pre-adult worms found in the metacestode, are thought to play fundamental roles in the host-parasite relationship. In this work, we performed a...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2012.01.001
更新日期:2012-05-01 00:00:00
abstract::Strongyloides and related genera are advantageous subjects for transgenesis in parasitic nematodes, primarily by gonadal microinjection as has been used with Caenorhabditis elegans. Transgenesis has been achieved in Strongyloides stercoralis and in Parastrongyloides trichosuri, but both of these lack well-adapted, con...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2011.06.002
更新日期:2011-10-01 00:00:00
abstract::The reduction in hemozoin content is a well known feature of chloroquine-resistant Plasmodium berghei. Using NK65-derived lines displaying increasing resistance levels, we observed an inverse relationship between the hemozoin content, and the glutathione (GSH) and glutathione S-transferase (GST) levels. Treatment of h...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/s0166-6851(98)00170-4
更新日期:1999-01-25 00:00:00
abstract::The binding kinetics of several benzimidazole compounds were determined with recombinant tubulin from benzimidazole-sensitive and -insensitive organisms. This study utilised the naturally occurring high efficacy of the benzimidazoles for the parasitic protozoa Giardia duodenalis and Encephalitozoon intestinalis, and l...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2004.08.001
更新日期:2004-11-01 00:00:00
abstract::Steroids and retinoids are important regulators of development in invertebrates and vertebrates. The central mediators of action of these compounds are their cognate receptors, which together form a family of proteins known as the nuclear receptor family. Previous studies have demonstrated that the genome of Onchocerc...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/s0166-6851(99)00152-8
更新日期:1999-11-30 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(89)90029-7
更新日期:1989-03-01 00:00:00
abstract::The Plasmodium falciparum Erythrocyte Binding Antigen-175, EBA-175, is a soluble merozoite stage parasite protein which binds to glycophorin A surface receptors on human erythrocytes. We have expressed two conserved cysteine-rich regions, region II and region VI, of this protein as soluble His-tagged polypeptides in i...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/s0166-6851(00)00375-3
更新日期:2001-03-01 00:00:00
abstract::Sj23, the 23-kDa target antigen in Schistosoma japonicum adult worms of the hybridoma monoclonal antibody (mAb) I-134, has been identified and cloned from cDNA libraries, mAb I-134 has been successfully used in immunodiagnostic assays to detect S. japonicum infection in Philippine patients. Sequence analysis has shown...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(91)90165-3
更新日期:1991-09-01 00:00:00
abstract::Phosphoinositides comprise a group of essential phospholipids that control a variety of cellular functions. In the case of the human malaria parasite Plasmodium falciparum, phosphoinositides have been shown to trigger exflagellation and to affect haemoglobin endocytosis and maturation of the parasite's digestive vacuo...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2010.03.020
更新日期:2010-08-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2018.06.005
更新日期:2018-07-01 00:00:00
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pub_type: 杂志文章
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更新日期:1993-10-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
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更新日期:1999-05-15 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2018.03.002
更新日期:2018-04-01 00:00:00
abstract::The heat shock response was studied as a model for control of gene expression and protein synthesis in Giardia lamblia. Cultured trophozoites were metabolically labelled with [35S]methionine, and proteins were analysed by SDS-polyacrylamide gel electrophoresis and fluorography. A temperature shift from 37 degrees C to...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(88)90061-8
更新日期:1988-03-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(81)90084-0
更新日期:1981-04-01 00:00:00
abstract::Recombinant proteins and synthetic peptides representing various sequences of gp82, a surface glycoprotein of Trypanosoma cruzi metacyclic trypomastigotes implicated in mammalian cell invasion, were used in this study aiming at the identification of the domain(s) of this molecule required for interaction with target c...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/s0166-6851(96)02626-6
更新日期:1996-06-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(84)90014-8
更新日期:1984-01-01 00:00:00
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journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2010.11.005
更新日期:2011-02-01 00:00:00
abstract::Topoisomerases are enzymes that participate in many cellular functions involving topological manipulation of DNA strands. There are two types of topoisomerases in the cell: (a) type I topoisomerases; and (b) type II topoisomerases (topo II). Previously we have cloned and sequenced the gene encoding Trypanosoma cruzi t...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/s0166-6851(98)00066-8
更新日期:1998-08-01 00:00:00
abstract::The livers of chickens maintained on a diet containing an effective in vivo level (70 ppm) of arprinocid, an anticoccidial agent, were found to contain 0.64 ppm of this drug and 0.33 ppm of a metabolite, arprinocid-1-N-oxide. When arprinocid was tested against Eimeria tenella in cultures of chick kidney epithelial cel...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/0166-6851(80)90051-1
更新日期:1980-10-01 00:00:00
abstract::The synchronization of intraerythrocytic maturation of Plasmodium parasites is an important factor in the malaria infection process. Synchronization is mediated by inositol phosphate (InsP(x))-induced Ca(2+)-release from internal stores. To further investigate the InsP(x) metabolism in these parasites a Plasmodium pro...
journal_title:Molecular and biochemical parasitology
pub_type: 杂志文章
doi:10.1016/j.molbiopara.2012.10.005
更新日期:2012-12-01 00:00:00