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Specific activity and utility of recombinant cellobiohydrolase II (Cel6A) produced in maize endosperm.
Transgenic Research 2024 March 8
Cellobiohydrolase II (CBH II) is an exo-glucanase that is part of a fungal mixture of enzymes from a wood-rot fungus, Trichoderma reesei. It is therefore difficult to purify and to establish a specific activity assay. The gene for this enzyme, driven by the rice Os glutelin promoter, was transformed into High II tissue culture competent corn, and the enzyme accumulated in the endosperm of the seed. The transgenic line recovered from tissue culture was bred into male and female elite Stine inbred corn lines, stiff stalk 16083-025 (female) and Lancaster MSO411 (male), for future production in their hybrid. The enzyme increases its accumulation throughout its 6 generations of back crosses, 27-266-fold between T1 and T2, and 2-10-fold between T2 and T3 generations with lesser increases in T4-T6. The germplasm of the inbred lines replaces the tissue culture corn variety germplasm with each generation, with the ultimate goal of producing a high-yielding hybrid with the transgene. The CBH II enzyme was purified from T5 inbred male grain 10-fold to homogeneity with 47.5% recovery. The specific activity was determined to be 1.544 units per µg protein. The corn-derived CBH II works in biopolishing of cotton by removing surface fibers to improve dyeability and increasing glucose from corn flour for increasing ethanol yield from starch-based first-generation processes.
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