Cruz-Davila J, Perez JV, Castillo DSD, Diez N. Fusarium graminearum as a producer of xylanases with low cellulases when grown on wheat bran.
BIOTECHNOLOGY REPORTS 2022;
35:e00738. [PMID:
35619590 PMCID:
PMC9127173 DOI:
10.1016/j.btre.2022.e00738]
[Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 05/13/2022] [Accepted: 05/15/2022] [Indexed: 11/29/2022]
Abstract
Endophytic fungi of cacao had important xylanase activity when grown on wheat bran.
F. graminearum strain Ec220 produced xylanases with low cellulolytic activity.
Xylanase production was optimized using response surface methodology.
Proteomic analysis revealed similarities with previously reported xylanases.
The xylanolytic potential of endophytic fungi isolated from leaves of Theobroma cacao was explored for the first time. Four fungal strains showed significant amounts of xylanase activity and low cellulase levels when grown on wheat bran as the sole carbon source. Strain Ec220 of Fusarium graminearum had the highest xylanase production (1.79 U/ml), whereas its cellulase activity was minimal (0.24 U/ml). Optimal conditions for xylanase production were: 154 h of incubation time, pH 5.79 and 29.8 °C. Furthermore, two protein spots detected by two-dimensional gel electrophoresis showed molecular weights (26.05 and 27.70 kDa) and isoelectric points (6.18 and 9.20) corresponding to previously reported F. graminearum xylanases, Xyl A and Xyl B, respectively. Therefore, endophytic fungi of T. cacao can be an important source of xylanolytic activities when cultured on wheat bran, and xylanases with low cellulases found in strain Ec220 require further characterization as they show promise for possible industrial applications.
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