Bombyx mori midgut membrane protein P252, which binds to Bacillus thuringiensis Cry1A, is a chlorophyllide-binding protein, and the resulting complex has antimicrobial activity

Applied and Environmental Microbiology
Ganesh N PandianHidetaka Hori

Abstract

The epithelial cell membrane 252-kDa protein (P252) isolated in our laboratory from Bombyx mori midgut was shown to bind strongly with Cry1Aa, Cry1Ab, and Cry1Ac toxins of Bacillus thuringiensis (15). In the current paper, P252 was shown to bind with chlorophyllide (Chlide) to form red fluorescent protein (RFP) complex, termed Bm252RFP, with absorbance and fluorescence emission peaks at 600 nm and 620 nm, respectively. P252 at a concentration of 1 microM is shown to bind with about 50 microM Chlide in a positively cooperative reaction to form Bm252RFP under aerobic conditions and in the presence of light at 37 degrees C. Various parameters influencing this reaction have been optimized for efficient in vitro chemical synthesis of Bm252RFP. Circular dichroism spectra revealed that P252 is composed of a beta-structure (39.8% +/- 2.2%, based on 5 samples) with negligible contribution of alpha-helix structure. When bound to Chlide, the beta-structure content in the complex is reduced to 21.6% +/- 3.1% (n = 5). Since Chlide had no secondary structure, the observed reduction suggests significant conformational changes of P252 during the formation of Bm252RFP complex. Bm252RFP had antimicrobial activity against Escherichia coli, Serrat...Continue Reading

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Citations

May 29, 2012·Proceedings of the National Academy of Sciences of the United States of America·Shogo AtsumiHiroaki Noda
Jul 8, 2010·Biological & Pharmaceutical Bulletin·Kalyankumar Marikallappa MattiShivayogeppa Bangareppa Hinchigeri
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Aug 28, 2021·Biomolecules·Yi-Ting WangJei-Fu Shaw

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