Abstract
Sulfolobus solfataricus strain Oα was previously isolated for its ability to grow on minimal medium supplemented with xylan as a carbon source. The strain exhibited thermostable xylanase activity but several attempts to identify the gene encoding for the activity failed. Further studies showed that the xylanase displayed activity on carboxymethylcellulose (CMC) and the new activity was characterized. It exhibited an optimal temperature and pH of 95°C and 3.5, respectively, and a half-life of 53 min at 95°C. The enzyme, which was demonstrated to be glycosylated, hydrolyzed CMC in an endo-manner releasing cellobiose and other cello-oligomers. Analysis of the tryptic fragments by tandem mass spectrometry led to identification of the endoglucanase precursor, encoded by the sso1354 gene, as the protein possessing dual activity. The efficiency of the SSO1354 protein in degrading cellulosic and hemicellulosic fractions contained in agronomic residues was tested at low pH and high temperature. Cellulose and xylan were degraded to glucose and xylose at 90°C, pH 4 by an enzyme mix consisting of SSO1354 and additional glycosyl hydrolases from S. solfataricus Oα. Given its role in saccharification processes requiring high temperatures and acidic environments, SSO1354 represents an interesting candidate for the utilization of agro-industrial waste for fuel production.
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Abbreviations
- CMC:
-
Carboxymethylcellulose
- RBB-xylan:
-
Remazol brilliant blue R-d-xylan
- AZO-CMC:
-
AZO-carboxymethylcellulose
- PAS:
-
Periodic acid Schiff
- ConA:
-
Concanavalin-A
- TX-extract:
-
Membrane proteins extract
- MS/MS:
-
Tandem mass spectrometry
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Acknowledgments
We thank Dr. Fiorella Conte for her helpful assistance with the preparation of genomic DNA and PCR analysis.
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Communicated by L. Huang.
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Maurelli, L., Giovane, A., Esposito, A. et al. Evidence that the xylanase activity from Sulfolobus solfataricus Oα is encoded by the endoglucanase precursor gene (sso1354) and characterization of the associated cellulase activity. Extremophiles 12, 689–700 (2008). https://doi.org/10.1007/s00792-008-0175-5
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DOI: https://doi.org/10.1007/s00792-008-0175-5