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Pesquisa : B02.200.400.400.440 [Categoria DeCS]
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[PMID]:27134021
[Au] Autor:Torregrosa-Crespo J; Martínez-Espinosa RM; Esclapez J; Bautista V; Pire C; Camacho M; Richardson DJ; Bonete MJ
[Ad] Endereço:Universidad de Alicante, Alicante, Spain.
[Ti] Título:Anaerobic Metabolism in Haloferax Genus: Denitrification as Case of Study.
[So] Source:Adv Microb Physiol;68:41-85, 2016.
[Is] ISSN:2162-5468
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A number of species of Haloferax genus (halophilic archaea) are able to grow microaerobically or even anaerobically using different alternative electron acceptors such as fumarate, nitrate, chlorate, dimethyl sulphoxide, sulphide and/or trimethylamine. This metabolic capability is also shown by other species of the Halobacteriaceae and Haloferacaceae families (Archaea domain) and it has been mainly tested by physiological studies where cell growth is observed under anaerobic conditions in the presence of the mentioned compounds. This work summarises the main reported features on anaerobic metabolism in the Haloferax, one of the better described haloarchaeal genus with significant potential uses in biotechnology and bioremediation. Special attention has been paid to denitrification, also called nitrate respiration. This pathway has been studied so far from Haloferax mediterranei and Haloferax denitrificans mainly from biochemical point of view (purification and characterisation of the enzymes catalysing the two first reactions). However, gene expression and gene regulation is far from known at the time of writing this chapter.
[Mh] Termos MeSH primário: Desnitrificação/fisiologia
Metabolismo Energético/fisiologia
Haloferax/metabolismo
Oxigênio/metabolismo
[Mh] Termos MeSH secundário: Anaerobiose/fisiologia
Técnicas Biossensoriais
Cloratos/metabolismo
Desnitrificação/genética
Nitrato Redutase/metabolismo
Nitrito Redutases/metabolismo
Oxirredutases/metabolismo
Percloratos/metabolismo
Águas Residuais/microbiologia
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; REVIEW
[Nm] Nome de substância:
0 (Chlorates); 0 (Perchlorates); 0 (Waste Water); EC 1.- (Oxidoreductases); EC 1.7.- (Nitrite Reductases); EC 1.7.2.4 (nitrous oxide reductase); EC 1.7.2.5 (nitric-oxide reductase); EC 1.7.99.4 (Nitrate Reductase); S88TT14065 (Oxygen); VLA4NZX2P4 (perchlorate)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170922
[Lr] Data última revisão:
170922
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160503
[St] Status:MEDLINE


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[PMID]:27088618
[Au] Autor:Stantial N; Dumpe J; Pietrosimone K; Baltazar F; Crowley DJ
[Ad] Endereço:Natural Sciences Department, Assumption College, Worcester, MA, USA.
[Ti] Título:Transcription-coupled repair of UV damage in the halophilic archaea.
[So] Source:DNA Repair (Amst);41:63-68, 2016 May.
[Is] ISSN:1568-7856
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Transcription-coupled repair (TCR) is a subpathway of nucleotide excision repair (NER) in which excision repair proteins are targeted to RNA polymerase-arresting lesions located in the transcribed strand of active genes. TCR has been documented in a variety of bacterial and eukaryotic organisms but has yet to be observed in the Archaea. We used Halobacterium sp. NRC-1 and Haloferax volcanii to determine if TCR occurs in the halophilic archaea. Following UV irradiation of exponentially growing cultures, we quantified the rate of repair of cyclobutane pyrimidine dimers in the two strands of the rpoB2B1A1A2 and the trpDFEG operons of Halobacterium sp. NRC-1 and the pts operon of H. volcanii through the use of a Southern blot assay and strand-specific probes. TCR was observed in all three operons and was dependent on the NER gene uvrA in Halobacterium sp. NRC-1, but not in H. volcanii. The halophilic archaea likely employ a novel mechanism for TCR in which an as yet unknown coupling factor recognizes the arrested archaeal RNA polymerase complex and recruits certain NER proteins to complete the process.
[Mh] Termos MeSH primário: Dano ao DNA
Reparo do DNA/efeitos da radiação
Halobacterium/genética
Haloferax/genética
Transcrição Genética/efeitos da radiação
Raios Ultravioleta/efeitos adversos
[Mh] Termos MeSH secundário: Proteínas Arqueais/genética
Proteínas Arqueais/metabolismo
Reparo do DNA/efeitos dos fármacos
Reparo do DNA/genética
Frutose/farmacologia
Halobacterium/efeitos dos fármacos
Halobacterium/efeitos da radiação
Haloferax/efeitos dos fármacos
Haloferax/efeitos da radiação
Óperon/genética
Transcrição Genética/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Archaeal Proteins); 30237-26-4 (Fructose)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170805
[Lr] Data última revisão:
170805
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160419
[St] Status:MEDLINE


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[PMID]:26906098
[Au] Autor:McDuff S; King GM; Neupane S; Myers MR
[Ad] Endereço:Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.
[Ti] Título:Isolation and characterization of extremely halophilic CO-oxidizing Euryarchaeota from hypersaline cinders, sediments and soils and description of a novel CO oxidizer, Haloferax namakaokahaiae Mke2.3T, sp. nov.
[So] Source:FEMS Microbiol Ecol;92(4):fiw028, 2016 Apr.
[Is] ISSN:1574-6941
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The phylogenetic affiliations of organisms responsible for aerobic CO oxidation in hypersaline soils and sediments were assessed using media containing 3.8 M NaCl. CO-oxidizing strains of the euryarchaeotes, Haloarcula, Halorubrum, Haloterrigena and Natronorubrum, were isolated from the Bonneville Salt Flats (UT) and Atacama Desert salterns (Chile). A halophilic euryarchaeote, Haloferax strain Mke2.3(T), was isolated from Hawai'i Island saline cinders. Haloferax strain Mke2.3(T) was most closely related to Haloferax larsenii JCM 13917(T) (97.0% 16S rRNA sequence identity). It grew with a limited range of substrates, and oxidized CO at a headspace concentration of 0.1%. However, it did not grow with CO as a sole carbon and energy source. Its ability to oxidize CO, its polar lipid composition, substrate utilization and numerous other traits distinguished it from H. larsenii JCM 13917(T), and supported designation of the novel isolate as Haloferax namakaokahaiae Mke2.3(T), sp. nov (= DSM 29988, = LMG 29162). CO oxidation was also documented for 'Natronorubrum thiooxidans' HG1 (Sorokin, Tourova and Muyzer 2005), N. bangense (Xu, Zhou and Tian 1999) and N. sulfidifaciens AD2(T) (Cui et al. 2007). Collectively, these results established a previously unsuspected capacity for extremely halophilic aerobic CO oxidation, and indicated that the trait might be widespread among the Halobacteriaceae, and occur in a wide range of hypersaline habitats.
[Mh] Termos MeSH primário: Monóxido de Carbono/metabolismo
Haloferax
Salinidade
Cloreto de Sódio/metabolismo
Microbiologia do Solo
[Mh] Termos MeSH secundário: Aerobiose
Chile
DNA Ribossômico/genética
Genoma Arqueal/genética
Sedimentos Geológicos/microbiologia
Haloferax/genética
Haloferax/isolamento & purificação
Haloferax/metabolismo
Oxirredução
Filogenia
RNA Ribossômico 16S/genética
Solo/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (DNA, Ribosomal); 0 (RNA, Ribosomal, 16S); 0 (Soil); 451W47IQ8X (Sodium Chloride); 7U1EE4V452 (Carbon Monoxide)
[Em] Mês de entrada:1611
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160225
[St] Status:MEDLINE


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[PMID]:26659359
[Au] Autor:Kumar V; Saxena J; Tiwari SK
[Ad] Endereço:Department of Genetics, Maharshi Dayanand University, Rohtak, 124001, Haryana, India.
[Ti] Título:Description of a halocin-producing Haloferax larsenii HA1 isolated from Pachpadra salt lake in Rajasthan.
[So] Source:Arch Microbiol;198(2):181-92, 2016 Mar.
[Is] ISSN:1432-072X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Haloarchaea grow in the extreme environment, such as high salt concentration, and secrete antimicrobial peptides known as halocins. Identification of Haloferax larsenii strain HA1 was carried out using biochemical and molecular methods. Strain HA1 was found as a strict aerobe, catalase positive and Gram negative. It was able to grow optimally at 15 % NaCl (w/v), 42 °C and pH 7.2. Strain HA1 was sensitive to bile acid, was resistant to chloramphenicol and could not utilize arginine. Halocin, produced by strain HA1, was stable up to 100 °C and in a pH range of 5.0-9.0. Antimicrobial activity was not affected by organic solvents, surfactants and detergents, but it was completely lost in the presence of proteinase K, suggesting proteinaceous nature of the compound. It was halocidal against indicator strain Hfx. larsenii HA10. The molecular weight of halocin HA1 was found to be ~14 kDa. These properties of halocin HA1 may be applicable to the preservation of salted foods.
[Mh] Termos MeSH primário: Haloferax/classificação
Haloferax/metabolismo
[Mh] Termos MeSH secundário: Peptídeos Catiônicos Antimicrobianos/química
Peptídeos Catiônicos Antimicrobianos/metabolismo
Bactérias Aeróbias/química
Bactérias Aeróbias/classificação
Bactérias Aeróbias/isolamento & purificação
Bactérias Aeróbias/metabolismo
Catalase/metabolismo
Haloferax/química
Haloferax/isolamento & purificação
Índia
Peso Molecular
Plantas Tolerantes a Sal/química
Plantas Tolerantes a Sal/classificação
Plantas Tolerantes a Sal/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antimicrobial Cationic Peptides); EC 1.11.1.6 (Catalase)
[Em] Mês de entrada:1609
[Cu] Atualização por classe:160213
[Lr] Data última revisão:
160213
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151215
[St] Status:MEDLINE
[do] DOI:10.1007/s00203-015-1175-3


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[PMID]:26601892
[Au] Autor:Chen S; Wang C; Xiang H
[Ad] Endereço:Department of Biology, School of Life Science and Technology, Honghe University, Mengzi 66110, Yunnan, China; State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: haloarchaea1979@gmail.com.
[Ti] Título:Sequence analysis and minimal replicon determination of a new haloarchaeal plasmid pHF2 isolated from Haloferax sp. strain Q22.
[So] Source:Plasmid;83:1-7, 2016 Jan.
[Is] ISSN:1095-9890
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A new cryptic plasmid, pHF2 (2520 bp), was isolated from Haloferax sp. strain Q22 (CGMCC 1.15317), a haloarchaeal strain living in a subterranean halite deposit. Sequence analysis revealed that it is the smallest plasmid in the genus Haloferax so far, and three syntropic open reading frames (ORF1, ORF2, and ORF3) were identified on the same strand. ORF1 encodes a putative replication initiation protein (Rep). Three typical motifs (I, II, and III) were presented in the Rep proteins of rolling-circle replicating (RCR) plasmids. The amino acid sequence of the Rep protein is very similar to that of another haloarchaeal plasmid pNB101 in Natronobacterium sp. AS-7091 (coverage 97%, identity 56%). The minimal replicon (~1000 bp) of pHF2 was determined through the construction of a series of truncated plasmids. Interestingly, we also found that the incomplete rep gene still can drive plasmid replication. This plasmid has provided another valuable extra-chromosomal genetic resource, and deepened our knowledge in DNA replication.
[Mh] Termos MeSH primário: Haloferax/genética
Plasmídeos/genética
Replicon
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Proteínas de Bactérias/genética
Proteínas de Bactérias/metabolismo
Sequência de Bases
Sedimentos Geológicos/microbiologia
Dados de Sequência Molecular
Fases de Leitura Aberta
RNA Ribossômico 16S
Análise de Sequência de DNA
Homologia de Sequência de Aminoácidos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1610
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151126
[St] Status:MEDLINE


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[PMID]:26308012
[Au] Autor:Rodrigo-Baños M; Garbayo I; Vílchez C; Bonete MJ; Martínez-Espinosa RM
[Ad] Endereço:Biochemistry and Molecular Biology Division, Agrochemistry and Biochemistry Department, Faculty of Sciences, University of Alicante, Ap. 99, E-03080 Alicante, Spain. rmontserb@gmail.com.
[Ti] Título:Carotenoids from Haloarchaea and Their Potential in Biotechnology.
[So] Source:Mar Drugs;13(9):5508-32, 2015 Aug 25.
[Is] ISSN:1660-3397
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:The production of pigments by halophilic archaea has been analysed during the last half a century. The main reasons that sustains this research are: (i) many haloarchaeal species possess high carotenoids production availability; (ii) downstream processes related to carotenoid isolation from haloarchaea is relatively quick, easy and cheap; (iii) carotenoids production by haloarchaea can be improved by genetic modification or even by modifying several cultivation aspects such as nutrition, growth pH, temperature, etc.; (iv) carotenoids are needed to support plant and animal life and human well-being; and (v) carotenoids are compounds highly demanded by pharmaceutical, cosmetic and food markets. Several studies about carotenoid production by haloarchaea have been reported so far, most of them focused on pigments isolation or carotenoids production under different culture conditions. However, the understanding of carotenoid metabolism, regulation, and roles of carotenoid derivatives in this group of extreme microorganisms remains mostly unrevealed. The uses of those haloarchaeal pigments have also been poorly explored. This work summarises what has been described so far about carotenoids production by haloarchaea and their potential uses in biotechnology and biomedicine. In particular, new scientific evidence of improved carotenoid production by one of the better known haloarchaeon (Haloferax mediterranei) is also discussed.
[Mh] Termos MeSH primário: Carotenoides/metabolismo
Haloferax/metabolismo
[Mh] Termos MeSH secundário: Animais
Biotecnologia/economia
Biotecnologia/métodos
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; REVIEW
[Nm] Nome de substância:
36-88-4 (Carotenoids)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150827
[St] Status:MEDLINE
[do] DOI:10.3390/md13095508


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[PMID]:26299206
[Au] Autor:Pinto LH; D'Alincourt Carvalho-Assef AP; Vieira RP; Clementino MM; Albano RM
[Ad] Endereço:Instituto de Biologia Roberto Alcântara Gomes, Departamento de Bioquímica, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil.
[Ti] Título:Complete genome sequence of Haloferax gibbonsii strain ARA6, a potential producer of polyhydroxyalkanoates and halocins isolated from Araruama, Rio de Janeiro, Brasil.
[So] Source:J Biotechnol;212:69-70, 2015 Oct 20.
[Is] ISSN:1873-4863
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Haloferax gibbonsii strain ARA6 is a haloarchaea isolated from saline saltern samples from Vermelha lake, located in Araruama region, Rio de Janeiro, Brazil. Its genome displays 66,2% G+C content and is composed by one circular chromosome of 2,945,391 bp and four circular plasmids comprising 993,063 bp. This genomic information shows H. gibbonsii's potential for biotechnological applications and can also contribute to assign evolutionary traits in the genus Haloferax.
[Mh] Termos MeSH primário: Genoma Bacteriano
Haloferax/genética
[Mh] Termos MeSH secundário: Sequência de Bases
Brasil
DNA Bacteriano/genética
Haloferax/isolamento & purificação
Haloferax/metabolismo
Dados de Sequência Molecular
Peptídeos/genética
Poli-Hidroxialcanoatos/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (Peptides); 0 (Polyhydroxyalkanoates)
[Em] Mês de entrada:1607
[Cu] Atualização por classe:151005
[Lr] Data última revisão:
151005
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150825
[St] Status:MEDLINE


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[PMID]:25048931
[Au] Autor:Das D; Salgaonkar BB; Mani K; Braganca JM
[Ad] Endereço:Department of Biological Sciences, Birla Institute of Technology and Science Pilani, KK Birla Goa Campus, NH 17B Zuarinagar, Goa 403 726, India.
[Ti] Título:Cadmium resistance in extremely halophilic archaeon Haloferax strain BBK2.
[So] Source:Chemosphere;112:385-92, 2014 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Halophilic archaea are prevalent in highly saline habitats. Haloferax strain BBK2 is an orange pigmented, exopolysaccharide (EPS) producing extremely halophilic archaeon, isolated from solar salterns of Ribandar, Goa, India. It grew in varying pH (5-10) and NaCl concentration (10-30%). The isolate grew well in complex (NTYE) and minimal media (NGSM) in presence of heavy metal cadmium (Cd) up to 4.0 mM (805.28 mg L(-1)) concentration. The optimum growth in the presence and absence of Cd was seen at a pH range of 7-9 and salinity of 15-25%. The growth kinetics of the isolate in NTYE showed a specific growth rate (µmax) of 0.352 with generation time of 1.968 days. In presence of 1mM Cd, the µmax was 0.325 day(-1) and generation time was 2.132 days. In NGSM, the µmax decreased from 0.517 day(-1) (in control) to 0.265 day(-1) in 1mM Cd while, the doubling time increased from 1.34 days in control to 2.615 days in presence of 1 mM Cd. SDS PAGE of the whole cell protein extracts showed overexpressed proteins of 74.14 and 40 kDa. The scanning electron microscopy, energy dispersive X-ray spectroscopy (SEM-EDX) analysis of the intact cells and cells disrupted by dialysis revealed that Cd was bound onto the cells, which was further confirmed by AAS, FTIR and XRD analysis.
[Mh] Termos MeSH primário: Cádmio/toxicidade
Haloferax/efeitos dos fármacos
Haloferax/fisiologia
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Relação Dose-Resposta a Droga
Ecossistema
Haloferax/crescimento & desenvolvimento
Índia
Salinidade
Espectrometria por Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); 00BH33GNGH (Cadmium)
[Em] Mês de entrada:1410
[Cu] Atualização por classe:140722
[Lr] Data última revisão:
140722
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140723
[St] Status:MEDLINE


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[PMID]:24344322
[Au] Autor:Mandal D; Köhrer C; Su D; Babu IR; Chan CT; Liu Y; Söll D; Blum P; Kuwahara M; Dedon PC; Rajbhandary UL
[Ti] Título:Identification and codon reading properties of 5-cyanomethyl uridine, a new modified nucleoside found in the anticodon wobble position of mutant haloarchaeal isoleucine tRNAs.
[So] Source:RNA;20(2):177-88, 2014 Feb.
[Is] ISSN:1469-9001
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Most archaea and bacteria use a modified C in the anticodon wobble position of isoleucine tRNA to base pair with A but not with G of the mRNA. This allows the tRNA to read the isoleucine codon AUA without also reading the methionine codon AUG. To understand why a modified C, and not U or modified U, is used to base pair with A, we mutated the C34 in the anticodon of Haloarcula marismortui isoleucine tRNA (tRNA2(Ile)) to U, expressed the mutant tRNA in Haloferax volcanii, and purified and analyzed the tRNA. Ribosome binding experiments show that although the wild-type tRNA2(Ile) binds exclusively to the isoleucine codon AUA, the mutant tRNA binds not only to AUA but also to AUU, another isoleucine codon, and to AUG, a methionine codon. The G34 to U mutant in the anticodon of another H. marismortui isoleucine tRNA species showed similar codon binding properties. Binding of the mutant tRNA to AUG could lead to misreading of the AUG codon and insertion of isoleucine in place of methionine. This result would explain why most archaea and bacteria do not normally use U or a modified U in the anticodon wobble position of isoleucine tRNA for reading the codon AUA. Biochemical and mass spectrometric analyses of the mutant tRNAs have led to the discovery of a new modified nucleoside, 5-cyanomethyl U in the anticodon wobble position of the mutant tRNAs. 5-Cyanomethyl U is present in total tRNAs from euryarchaea but not in crenarchaea, eubacteria, or eukaryotes.
[Mh] Termos MeSH primário: Anticódon/genética
Haloarcula marismortui/genética
RNA Arqueal/genética
RNA de Transferência de Isoleucina/genética
Uridina/análogos & derivados
[Mh] Termos MeSH secundário: Pareamento de Bases
Sequência de Bases
Códon/genética
Escherichia coli/genética
Haloferax/genética
Estrutura Molecular
Mutação Puntual
RNA Arqueal/química
RNA Arqueal/metabolismo
RNA Bacteriano/genética
RNA Fúngico/genética
RNA de Transferência de Isoleucina/química
RNA de Transferência de Isoleucina/metabolismo
Ribossomos/química
Saccharomyces cerevisiae/genética
Sulfolobus/genética
Aminoacilação de RNA de Transferência
Uridina/química
Uridina/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Anticodon); 0 (Codon); 0 (RNA, Archaeal); 0 (RNA, Bacterial); 0 (RNA, Fungal); 0 (RNA, Transfer, Ile); WHI7HQ7H85 (Uridine)
[Em] Mês de entrada:1403
[Cu] Atualização por classe:161019
[Lr] Data última revisão:
161019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:131218
[St] Status:MEDLINE
[do] DOI:10.1261/rna.042358.113


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[PMID]:24150694
[Au] Autor:Oren A; Elevi Bardavid R; Mana L
[Ad] Endereço:Department of Plant and Environmental Sciences, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel, aharon.oren@mail.huji.ac.il.
[Ti] Título:Perchlorate and halophilic prokaryotes: implications for possible halophilic life on Mars.
[So] Source:Extremophiles;18(1):75-80, 2014 Jan.
[Is] ISSN:1433-4909
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:In view of the finding of perchlorate among the salts detected by the Phoenix Lander on Mars, we investigated the relationships of halophilic heterotrophic microorganisms (archaea of the family Halobacteriaceae and the bacterium Halomonas elongata) toward perchlorate. All strains tested grew well in NaCl-based media containing 0.4 M perchlorate, but at the highest perchlorate concentrations, tested cells were swollen or distorted. Some species (Haloferax mediterranei, Haloferax denitrificans, Haloferax gibbonsii, Haloarcula marismortui, Haloarcula vallismortis) could use perchlorate as an electron acceptor for anaerobic growth. Although perchlorate is highly oxidizing, its presence at a concentration of 0.2 M for up to 2 weeks did not negatively affect the ability of a yeast extract-based medium to support growth of the archaeon Halobacterium salinarum. These findings show that presence of perchlorate among the salts on Mars does not preclude the possibility of halophilic life. If indeed the liquid brines that may exist on Mars are inhabited by salt-requiring or salt-tolerant microorganisms similar to the halophiles on Earth, presence of perchlorate may even be stimulatory when it can serve as an electron acceptor for respiratory activity in the anaerobic Martian environment.
[Mh] Termos MeSH primário: Haloferax/metabolismo
Marte
Percloratos/metabolismo
Salinidade
[Mh] Termos MeSH secundário: Adaptação Fisiológica
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Perchlorates); VLA4NZX2P4 (perchlorate)
[Em] Mês de entrada:1410
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM; S
[Da] Data de entrada para processamento:131024
[St] Status:MEDLINE
[do] DOI:10.1007/s00792-013-0594-9



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