Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/4094
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Type: Artigo de Periódico
Issue Date: Jan-2012
Authors: SANTANA, Priscila di Paula Bessa
GHILARDI JUNIOR, Rubens
ALVES, Claudio Nahum
SILVA, Jeronimo Lameira
MCCULLOCH, John Anthony
SCHNEIDER, Maria Paula Cruz
SILVA, Artur Luiz da Costa da
Title: Diversity and three-dimensional structures of the alpha Mcr of the methanogenic Archaea from the anoxic region of Tucuruí Lake, in Eastern Brazilian Amazonia
Citation: SANTANA, Priscila Bessa, et al. Diversity and three-dimensional structures of the alpha Mcr of the methanogenic Archaea from the anoxic region of Tucuruí Lake, in Eastern Brazilian Amazonia. Genetics and Molecular Biology, São Paulo, v. 35, n. 1, p. 126-133, 2012, Epub 20 jan. 2012. Disponível em: <http://www.scielo.br/pdf/gmb/v35n1/2011-055.pdf>. Acesso em: 06 ago. 2013. <http://dx.doi.org/10.1590/S1415-47572012005000004>.
Abstract: Methanogenic archaeans are organisms of considerable ecological and biotechnological interest that produce methane through a restricted metabolic pathway, which culminates in the reaction catalyzed by the Methyl-coenzyme M reductase (Mcr) enzyme, and results in the release of methane. Using a metagenomic approach, the gene of the a subunit of mcr (mcrα) was isolated from sediment sample from an anoxic zone, rich in decomposing organic material, obtained from the Tucuruí hydroelectric dam reservoir in eastern Brazilian Amazonia. The partial nucleotide sequences obtained were 83 to 95% similar to those available in databases, indicating a low diversity of archaeans in the reservoir. Two orders were identified -the Methanomicrobiales, and a unique Operational Taxonomic Unit (OTU) forming a clade with the Methanosarcinales according to low bootstrap values. Homology modeling was used to determine the three-dimensional (3D) structures, for this the partial nucleotide sequence of the mcrα were isolated and translated on their partial amino acid sequences. The 3D structures of the archaean mcrα observed in the present study varied little, and presented approximately 70% identity in comparison with the mcrα of Methanopyrus klanderi. The results demonstrated that the community of methanogenic archaeans of the anoxic C1 region of the Tucurui reservoir is relatively homogeneous.
Keywords: Archaea
Metil-coenzima M redutase
Modelagem por homologia
Lago de Tucuruí - PA
Tucuruí - PA
Pará - Estado
Amazônia Brasileira
ISSN: 1415-4757
Appears in Collections:Artigos Científicos - ICB
Artigos Científicos - ICEN

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