Lignocellulolytic enzymes from Aspergillus allahabadii for efficient bioconversion of rice straw into fermentable sugars and biogas.

[Display omitted] • Comparative genome wide sequence analysis of Aspergillus strains. • Developing hyper lignocellulolytic strain of A. allahabadii. • Secretome profiling identifies up-regulated GH and transcriptional factor in mutant. • Enzyme cocktail of mutant MAN 40 and CBH from R. emersonii for efficient hydrolysis. • In situ addition of cellulase for valorization of waste lignin stream in biogas. The study was aimed at developing lignocellulolytic strain capable of efficient hydrolysis of mild alkali deacetylated (MAD) rice straw. The valorisation of lignin rich black liquor obtained during pre-treatment of rice straw into biogas was also evaluated. Study reports highly proficient cellulolytic Aspergillus allahabadii strain harbouring a spectrum of CAZymes based on comparative genome wide analysis that was subjected to strain breeding for developing a hyper producing strain. The secretome analysis showed up-modulation and several folds increase in the CAZyme activities in the culture extracts of the developed strain MAN 40 when compared to parent. The cellulolytic cocktail of the developed strain showed 1.52 folds higher saccharification of MAD rice straw when compared to Cellic CTec 3. Moreover, in-situ addition of cellulases derived from developed strains resulted in ∼3.7 folds higher methane production during anaerobic digestion of mixture of lignin rich black liquor and differently treated rice straw. [ABSTRACT FROM AUTHOR]