Authors: Masao Tokunaga Makoto Mizukami Koji Yamasaki Hiroko Tokunaga Hiromasa Onishi Hiroshi Hanagata Matsujiro Ishibashi Akira Miyauchi Kouhei Tsumoto Tsutomu Arakawa
Publish Date: 2013/01/20
Volume: 97, Issue: 19, Pages: 8569-8580
Abstract
Halophilic βlactamase BLA has been successfully used as a novel fusion partner for soluble expression of aggregationprone foreign proteins in Escherichia coli cytoplasm Appl Microbiol Biotechnol 86649–658 2010b This halophilic BLA fusion technology was applied here for secretory expression in Brevibacillus The “Brevibacillus in vivo cloning” method recently developed by Higeta Shoyu group for the construction and transformation of Brevibacillus expression vectors facilitates efficient screening of the production conditions of Brevibacillus expression system Two singlechain antibodies scFv HyHEL10 single chain scFv scFvHEL and antifluorescein single chain scFv scFvFLU were successfully secreted to culture supernatant as a fusion protein with halophilic BLA The scFvHELHis purified after cleavage of BLA portion with thrombin was fully active it formed a stoichiometric complex with the antigen lysozyme and inhibited the enzymatic activity The scFvFLUHis similarly expressed and purified stoichiometrically inhibited fluorescence intensity of fluorescein The molecular mass of scFvHELHis was determined to be 27800 Da by light scattering measurements indicating its monomeric structure in solutionWe are grateful to Drs Daisuke Ejima and Haruna Sato for the assistance of SEC MALS measurements This work was supported by a Grant in Aid for Science Research 20580372 23580475 to MT from MEXT Japan and by funding from the Institute for Fermentation Osaka to MT
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