Data/hora: 06/06/2024 01:37:45

Provedor de dados: 	58	
País: 	Brazil	
Título: 	Phenol degradation and genotypic analysis of dioxygenase genes in bacteria isolated from sediments	
Autores: 	Tian,Mengyang; Du,Dongyun; Zhou,Wei; Zeng,Xiaobo; Cheng,Guojun.	
Data: 	2017-06-01	
Ano: 	2017	
Palavras-chave: 	Isolation and identification; Gram-negative bacteria; Substrate utilization; Dioxygenase genes; Phenol biodegradation.	
Resumo: 	Abstract The aerobic degradation of aromatic compounds by bacteria is performed by dioxygenases. To show some characteristic patterns of the dioxygenase genotype and its degradation specificities, twenty-nine gram-negative bacterial cultures were obtained from sediment contaminated with phenolic compounds in Wuhan, China. The isolates were phylogenetically diverse and belonged to 10 genera. All 29 gram-negative bacteria were able to utilize phenol, m-dihydroxybenzene and 2-hydroxybenzoic acid as the sole carbon sources, and members of the three primary genera Pseudomonas, Acinetobacter and Alcaligenes were able to grow in the presence of multiple monoaromatic compounds. PCR and DNA sequence analysis were used to detect dioxygenase genes coding for catechol 1,2-dioxygenase, catechol 2,3-dioxygenase and protocatechuate 3,4-dioxygenase. The results showed that there are 4 genotypes; most strains are either PNP (catechol 1,2-dioxygenase gene is positive, catechol 2,3-dioxygenase gene is negative, protocatechuate 3,4-dioxygenase gene is positive) or PNN (catechol 1,2-dioxygenase gene is positive, catechol 2,3-dioxygenase gene is negative, protocatechuate 3,4-dioxygenase gene is negative). The strains with two dioxygenase genes can usually grow on many more aromatic compounds than strains with one dioxygenase gene. Degradation experiments using a mixed culture representing four bacterial genotypes resulted in the rapid degradation of phenol. Determinations of substrate utilization and phenol degradation revealed their affiliations through dioxygenase genotype data.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000200305	
Editor: 	Sociedade Brasileira de Microbiologia	
Relação: 	10.1016/j.bjm.2016.12.002	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Microbiology  v.48 n.2 2017	
Fonte: 	info:eu-repo/semantics/openAccess