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The inhibition of hemicellulosic sugars on cellulose hydrolysis are highly dependant on the cellulase productive binding, processivity, and substrate surface charges.

Abstract：

:In this study, the influence of major hemicellulosic sugars (mannose and xylose) on cellulose hydrolysis and major enzyme activities were evaluated by using both commercial enzyme cocktail and purified cellulase monocomponents over a "library" of cellulosic substrates. Surprisingly, the results showed that unlike glucose, mannose/xylose did not inhibit individual cellulase activities but significantly decreased their hydrolytic performance on cellulose substrates. When various enzyme-substrate interactions (e.g. adsorption/desorption, productive binding, and processive moving) were evaluated, it appeared that these hemicellulosic sugars significantly reduced the productive binding and processivity of Cel7A, which in turn limited cellulase hydrolytic efficacy. Among a range of major cellulose characteristics (e.g. crystallinity, degree of polymerization, accessibility, and surface charges), the acid group content of the cellulosic substrates seemed to be the main driver that determined the extent of hemicellulosic sugar inhibition. Our results provided new insights for better understanding the sugar inhibition mechanisms of cellulose hydrolysis.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Zhai R,Hu J,Saddler JN

doi

10.1016/j.biortech.2017.12.006

subject

Has Abstract

pub_date

2018-06-01 00:00:00

pages

79-87

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(17)32115-6

journal_volume

258

pub_type

杂志文章

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