Data/hora: 22/09/2024 20:37:35

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	19/04/2021	
Data da última atualização: 	12/08/2021	
Autoria: 	PARADA-PINILLA, M. P.; FERREIRA, M. A.; RONCALLO, J. C.; SANTOS, S. N.; MELO, I. S. de; ASSEF, A. N. B.; WILKE, D. V.; SILVA, L. F.; GARRIDO, L. M.; ARAUJO, W. L.; PADILLA, G.	
Afiliação: 	MARIA PAULA PARADA-PINILLA, ICB-USP; MARIA ALEJANDRA FERREIRA, ICB-UDP; JUAN CAMILO RONCALLO, ICB-USP; SUIKINAI NOBRE SANTOS; ITAMAR SOARES DE MELO, CNPMA; ALEXIA NATHÁLIA BRÍGIDO ASSEF, UFC; DIEGO VERAS WILKE, UFC; LUIZIANA F SILVA, ICB-USP; LEANDRO MAZA GARRIDO, ICB-USP; WELINGTON LUIUZ ARAÚJO, ICB-USP; GABRIEL PADILLA, ICB-USP.	
Título: 	Biopolymer production by halotolerant bacteria isolated from Caatinga biome.	
Ano de publicação: 	2021	
Fonte/Imprenta: 	Brazilian Journal of Microbiology, v. 52, n. 2, p. 547-559, 2021.	
ISSN: 	1678-4405	
DOI: 	https://doi.org/10.1007/s42770-021-00426-1	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Saline environments are extreme habitats with a high diversity of microorganisms source of a myriad of biomolecules. These microorganisms are assigned as extremophiles recognized to be producers of new natural compounds, which can be synthesized by helping to survive under harshness and extreme conditions. In Brazil, in the saline and semi-arid region of Areia Branca (Caatinga biome), halotolerant bacteria (able to growth at high NaCl concentrations) were isolated from rhizosphere of native plants Blutaparon portulacoides and Spergularia sp. and their biopolymer production was studied. A total of 25 bacterial isolates were identified at genus level based on 16S rRNA gene sequence analysis. Isolates were mainly Gram-positive bacteria from Bacillaceae, Staphylococcaceae, Microbacteriaceae, and Bacillales XII incertae sedis families, affiliates to Bacillus, Staphylococcus, Curtobacterium, and Exiguobacterium genera, respectively. One of the Gram-negative isolates was identified as member of the Pseudomonadaceae family, genus Pseudomonas. All the identified strains were halotolerant bacteria with optimum growth at 0.6-2.0 M salt concentrations. Assays for biopolymer production showed that the halotolerant strains are a rich source of compounds as polyhydroxyalkanoates (PHA), biodegradable biopolymer, such as poly(3-hydroxybutyrate) (PHB) produced from low-cost substrates, and exopolysaccharides (EPS), such as hyaluronic acid (HA), metabolite of great interest to the cosmetic and pharmaceutical industry. Also, eight bacterial EPS extracts showed immunostimulatory activity, promising results that can be used in biomedical applications. Overall, our findings demonstrate that these biomolecules can be produced in culture medium with 0.6-2.0 M NaCl concentrations, relevant feature to avoid costly production processes. This is the first report of biopolymer-producing bacteria from a saline region of Caatinga biome that showed important biological activities.	
Palavras-Chave: 	Caatinga biome; Halotolerant microorganisms; Immunostimulatory activity.	
Thesagro: 	Bactéria; Caatinga.	
Thesaurus Nal: 	Biopolymers; Exopolysaccharides; Hyaluronic acid; Immunostimulation (physiological); Polyhydroxyalkanoates.	
Categoria do assunto: 	S Ciências Biológicas	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (16970-1) - UPC - AP - DD -  -  -  - DIS