Studies on structure and function of bacterial yellow affinity substance capable of enhancing enzymatic degradation of cellulose and its gene

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Yellow affinity substance(YAS) extracted from cells of Clostridium thermocellum strain ATCC 27405 using acetone as the extracting solvent was adsorbed to microcrystalline cellulose(Funacel) and its digestibility was examined using some cellulase preparations. YAS-adsorbed Funacel was about 3-folds more efficiently degraded by cellulosome prepared from the culture supernatant of C. thermocellum ATCC 27405 than non-treated Funacel was. In addition, YAS-adsorbed Funacel was 2.5-folds more susceptible to mini-cellulosome constructed from three cellulases and a chimeric scaffolding protein than non-treated Funacel. This is the first study showing that YAS has an ability to enhance susceptibility of cellulose to cellulolytic enzymes.