Cellulases are of considerable current interest for converting the cellulosic content of biomass to fermentable sugars for biofuels production. To facilitate the enzymatic conversion of biomass to sugars, pre-treatment processes at high temperatures, low pH, and even in ionic liquids are candidates to reduce the recalcitrance of the lignocellulosic substrate. Cellulases that function at high temperatures and are stable to pre-treatment conditions offer the potential advantages of lower cooling costs, higher solids loadings, reduced risk of microbial contamination, and higher reaction rates.
Hyperthermophilic archaea and bacteria are potential sources of extremely stable cellulosic enzymes. To this end, bioprospecting for thermophilic cellulose degraders and their enzymes has resulted in the discovery of a unique cellulase, designated EBI244, which is most active at 109°C (a record for cellulases) and is the most heat tolerant enzyme found in any cellulose-digesting microbe, including bacteria. These results demonstrate the discovery of a novel hyperthermophilic cellulase from a hyperthermophilic enrichment, and establish that hyperthermophilic archaea are capable of growth on crystalline cellulose.
Another approach to develop more stable cellulases is to generate new enzymes by protein engineering. We have thus employed several protein-engineering strategies, including rational design and directed evolution, to create cellulases with improved thermostability and activity profiles tailored to a desired temperature range. These results will be discussed in connection with cellulase structure-stability relationships and the complementarity of bioprospecting and protein engineering for the discovery and generation of new cellulases.
This Webinar is FREE to members of SBE. Simply click 'Attend this Webinar' below and our system will recognize your log in and charge you $0.
AIChE members may join SBE for only $15. Join SBE now (processing takes about 24 hours) and return to this page with your new log-in and you will receive this webinar for FREE.
Would you like to access this content?
No problem. You just have to complete the following steps.
You have completed 0 of 2 steps.
You must be logged in to view this content. Log in now.
You must purchase this webinar using one of the options below.
If you already purchased this content recently, please click here to refresh the system's record of ownerships.
|Credits||1 Use credits|
|List Price||$99.00 Buy now|
|AIChE Members||$69.00 Buy now|
|AIChE Undergraduate Student Members||Free Free access|
|AIChE Graduate Student Members||$69.00 Buy now|
|SBE Members||Free Free access|