Abstract

Modified polyhedrin promoter (Ppolh) was designed by repeating burst sequences (BSs) and adopted to overexpress rat α2,6-sialyltransferase (ST6Gal I) in silkworm. Modified Ppolh of five BSs with VLF-1 coexpression yielded 2.9 U/ml ST6Gal I activity and 32.5 mU/mg specific activity, which was 1.7- and 2.3-fold higher, respectively compared to Ppolh.

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