TY - JOUR
T1 - A Cellulolytic Streptomyces Sp. Isolated from a Highly Oligotrophic Niche Shows Potential for Hydrolyzing Agricultural Wastes
AU - Celaya-Herrera, Samuel
AU - Casados-Vázquez, Luz E.
AU - Valdez-Vazquez, Idania
AU - Barona-Gómez, Francisco
AU - Bideshi, Dennis K.
AU - Barboza-Corona, José E.
N1 - Publisher Copyright:
© 2020, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2021/3
Y1 - 2021/3
N2 - Cellulases from Streptomyces species can be used as auxiliary agents in the pretreatment of lignocellulosic materials, but little work has been done on this topic. Besides, Streptomyces strains have been identified from Cuatro Cienegas basin, but their potential in the treatment of agricultural wastes has not been demonstrated. In this work a Streptomyces sp., strain CC48 isolated from the oligotrophic environment, shows high levels of cellulolytic activity (0.76 U/ mL at pH 7.0, 60 °C) in minimum medium supplemented with carboxymethyl cellulose compared with other Streptomyces strains and isolates in a bacterial collection. At least three putative cellulases (~30, 40, and 45 kDa) were identified in Streptomyces sp. CC48 extracts. The addition of Mg2+ increased cellulase activity by 23%, whereas other cations resulted in decreased catalysis. Residual cellulolytic activities after 4 and 8 h of incubation at 60 °C were ~ 73 and 65%, respectively, and ~ 98% at 50 °C after 8 h. Corn cob and wheat straw pretreated with an alkaline method showed saccharification values of 320 and 330 mg/g of reducing sugars per gram of dry substrate, respectively. The significance of this work lies in the fact that data provided here show that Streptomyces sp. strain CC48 is capable of hydrolyzing both maize and wheat substrates, suggesting the potential of this bacterium to hydrolyze agricultural wastes. Also, Cuatro Cienegas Basin may represent a source for efficient cellulolytic microorganisms.
AB - Cellulases from Streptomyces species can be used as auxiliary agents in the pretreatment of lignocellulosic materials, but little work has been done on this topic. Besides, Streptomyces strains have been identified from Cuatro Cienegas basin, but their potential in the treatment of agricultural wastes has not been demonstrated. In this work a Streptomyces sp., strain CC48 isolated from the oligotrophic environment, shows high levels of cellulolytic activity (0.76 U/ mL at pH 7.0, 60 °C) in minimum medium supplemented with carboxymethyl cellulose compared with other Streptomyces strains and isolates in a bacterial collection. At least three putative cellulases (~30, 40, and 45 kDa) were identified in Streptomyces sp. CC48 extracts. The addition of Mg2+ increased cellulase activity by 23%, whereas other cations resulted in decreased catalysis. Residual cellulolytic activities after 4 and 8 h of incubation at 60 °C were ~ 73 and 65%, respectively, and ~ 98% at 50 °C after 8 h. Corn cob and wheat straw pretreated with an alkaline method showed saccharification values of 320 and 330 mg/g of reducing sugars per gram of dry substrate, respectively. The significance of this work lies in the fact that data provided here show that Streptomyces sp. strain CC48 is capable of hydrolyzing both maize and wheat substrates, suggesting the potential of this bacterium to hydrolyze agricultural wastes. Also, Cuatro Cienegas Basin may represent a source for efficient cellulolytic microorganisms.
KW - Cellulases
KW - Maize substrates
KW - Saccharification
KW - Streptomyces sp
KW - Wheat substrates
UR - http://www.scopus.com/inward/record.url?scp=85088859810&partnerID=8YFLogxK
U2 - 10.1007/s12155-020-10174-z
DO - 10.1007/s12155-020-10174-z
M3 - Artículo
AN - SCOPUS:85088859810
SN - 1939-1234
VL - 14
SP - 333
EP - 343
JO - Bioenergy Research
JF - Bioenergy Research
IS - 1
ER -