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Description of cellobiohydrolases Ce16A and Ce17A fromTrichoderma reesei using Langmuir-type models

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Abstract

The binding of cellobiohydrolases to cellulose is a crucial initial step in cellulose hydrolysis. In the search for a detailed understanding of the function of cellobiohydrolases, much information concerning how the enzymes and their constituent catalytic and cellulose-binding changes during hydrolysis is still needed. The adsorption of purffied two cellobiohydrolases (Ce17A and Ce16A) fromTrichoderma reesei cellulase to microcrystalline cellulose has been studied. Cellobiohydrolase II (Ce16A) does not affect the adsorption of cellobiohydrolase I (Ce17A) significantly, and there are specific binding sites for both Ce17A and Ce16A. The adsorption affinity and tightness of the cellulase binding domain (CBD) for Ce17A are larger that those of the CBD for Ce16A. The CBD for Ce17A binds more rapidly and tightly to Avicel than the CBD for Ce16A. The decrease in adsorption observed when the two cellobihydrolases are studied together would appear to be the result of competition for binding sites on the cellulose. Ce17A competes more efficiently for binding sites than Ce16A. Competition for binding sites is the dominating factor when the two enzymes are acting together, furthermore adsorption to sites specific for Ce17A and Ce16A, also contributes to the total adsorption.

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  1. Department of Chemistry, Physical Chemistry Laboratory, College of Natural Sciences, Chungbuk National University, 361-763, Cheongju, Korea

    Dong Won Kim & Young Gwan Hong

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  1. Dong Won Kim
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  2. Young Gwan Hong
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Correspondence to Dong Won Kim.

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Kim, D.W., Hong, Y.G. Description of cellobiohydrolases Ce16A and Ce17A fromTrichoderma reesei using Langmuir-type models. Biotechnol. Bioprocess Eng. 6, 89–94 (2001). https://doi.org/10.1007/BF02931952

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  • DOI: https://doi.org/10.1007/BF02931952

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