Phylogenetic analysis and homology modelling of a new Cry8A crystal protein expressed in a sporulating soil bacterium.

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Tác giả: José D Antonino, Shalini Chaudhary, Marcelo da Costa Mendonça, Marcus V de Aragão Batista, Silvio S Dolabella, Sona Jain, Mark Lubberts, Brendan J McConkey, Patricia Severino, Eliana B Souto, Camilla A S Valença

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: United States : Journal of structural biology , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 700858

Cry proteins, commonly found in Gram-positive soil bacteria, are used worldwide as aerial sprays or in transgenic plants for controlling crop pest populations and insect vectors. Via PCR analysis, a spore producing soil isolate (BV5) was speculated to encode a Cry gene. Partial nucleotide sequence of the amplified PCR fragment showed homology with the Cry8 genes present in GenBank. A full-length Cry gene was cloned, and the predicted protein sequence grouped the newly isolated Cry protein with other Cry8A present in GenBank with a high possibility of it being a new Cry8. SDS-PAGE and MALDI-TOF mass spectrometry confirmed the expression of a single 135 KDa protein matching uniquely to the putative protein sequence of the BV5 Cry gene. However, bioassay against the coleopteran Anthonomus grandis (Coleopterans are a known Cry8A target), showed no activity. Phylogenetic analysis and homology modelling was performed to characterize the protein structure and function. These analyses suggest a series of mutations in one of the variable loops on the surface of the protein.
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