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1.
Jpn J Infect Dis ; 67(4): 282-7, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25056074

RESUMO

Recently, new genotypes of human adenoviruses (HAdVs) have been reported and many of them have been found to be recombinant forms of different known types of HAdV species D (HAdV-D). The objective of this study was to document the evolutionary features of a novel isolate (HAdV_Chiba_E086/2012) obtained from the eye swab of a patient with conjunctivitis in Japan. Viral DNA was extracted from the isolate to sequence the whole genome by the Sanger method and aligned with available genome sequences of HAdV-Ds. The phylogenetic trees of the nucleotide sequences of the penton base, hexon, and fiber genes and the E3 region showed that HAdV_Chiba_E086/2012 is closest to HAdV genotype 65 (HAdV-GT65), HAdV-48, HAdV-GT60 and HAdV-22 at 98%, 99%, 95% and 98% identity, respectively, suggesting that this isolate is a novel recombinant form to be designated as P65H48F60. Further phylogenetic and recombination analyses of the genome alignment of the new isolate implied that nested recombination events involving HAdV-GT59, GT65, 48, GT60, 22, and some ancestral lineages or their close relatives have shaped its genome. These results showed that HAdV_Chiba_E086/2012 is the first HAdV-48-related HAdV found in Japan, which has the most complicated evolutionary history among the known HAdVs so far.


Assuntos
Infecções por Adenovirus Humanos/virologia , Adenovírus Humanos/genética , Adenovírus Humanos/classificação , Adenovírus Humanos/isolamento & purificação , DNA Viral/análise , DNA Viral/genética , Feminino , Humanos , Japão , Pessoa de Meia-Idade , Filogenia , Recombinação Genética , Análise de Sequência de DNA
3.
J Biosci Bioeng ; 113(4): 445-50, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22197497

RESUMO

Phosphite dehydrogenase (PtxD), which catalyzes the nearly irreversible oxidation of phosphite to phosphate with the concomitant reduction of NAD(+) to NADH, has great potential for NADH regeneration in industrial biocatalysts. Here, we isolated a soil bacterium, Ralstonia sp. strain 4506, that grew at 45°C on a minimal medium containing phosphite as the sole source of phosphorus. A recombinant PtxD of Ralstonia sp. (PtxD(R4506)) appeared in the soluble fraction in Escherichia coli. The purified PtxD(R4506) showed 6.7-fold greater catalytic efficiency (V(max)/K(m)) than the first characterized PtxD of Pseudomonas stutzeri (PtxD(PS)). Moreover, the purified PtxD(R4506) showed maximum activity at 50°C, and its half-life of thermal inactivation at 45°C was 80.5h, which is approximately 3,450-fold greater than that of PtxD(PS). Therefore, we concluded that PtxD(R4506), which shows high catalytic efficiency, solubility, and thermostability, would be useful for NADH regeneration applications.


Assuntos
NADH NADPH Oxirredutases/genética , NADH NADPH Oxirredutases/metabolismo , Ralstonia/enzimologia , Ralstonia/genética , Temperatura , Sequência de Aminoácidos , Catálise , Ativação Enzimática/efeitos dos fármacos , Inibidores Enzimáticos/farmacologia , Escherichia coli/genética , Escherichia coli/metabolismo , Expressão Gênica , Meia-Vida , Cinética , Dados de Sequência Molecular , Mutação , NAD/metabolismo , NADH NADPH Oxirredutases/química , NADH NADPH Oxirredutases/isolamento & purificação , Oxirredução , Filogenia , RNA Ribossômico 16S/genética , Ralstonia/classificação , Proteínas Recombinantes/metabolismo , Alinhamento de Sequência
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