Dai R, Su X, Jin X, Zhang J, Guan X, Chen C, Shu C, Huang T. Cloning, Expression, Purification, and Insecticidal Activity of a Novel Cry1Na3 Toxin From Bacillus thuringiensis BRC-ZYR2.
JOURNAL OF ECONOMIC ENTOMOLOGY 2016;
109:1064-1070. [PMID:
27170729 DOI:
10.1093/jee/tow031]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 02/08/2016] [Indexed: 06/05/2023]
Abstract
Bacillus thuringiensis produces a variety of insecticidal crystal proteins (ICPs). Genome sequencing is a promising strategy for detecting and identifying B. thuringiensis ICPs, which are of great interest to the biocontrol field. In this study, a novel ICP gene was cloned from B. thuringiensis BRC-ZYR2 based on genomic data from 454 GS-FLX Titanium sequencing and an analysis of the results using the B. thuringiensis Toxin_Scanner ( http://bcam.hzaubmb.net/BtToxin_scanner/index.php ). cry1Na3 designated by the B. thuringiensis Toxin Nomenclature Committee, encoded a 601-amino acid, 68.0-kDa protein that exhibited 95% identity with Cry1Na1 and 99% identity with Cry1Na2. Cry1Na3 contained three conserved domains commonly found in three-domain ICPs. Cry1Na3 was toxic to Plutella xylostella (L.) and Ostrinia furnacalis (Guenée), with LC 50 values of 3.69 μg/ml and 31.30 μg/ml, respectively. However, Laodelphax striatellus (Fallén) nymphs were unaffected when fed purified Cry1Na3 (250 μg/ml) in their diet. Spodoptera exigua (Hübner) and Colaphellus bowringi (Baly) larvae survived even when the concentration of Cry1Na3 protein reached 500 μg/ml. Cry1Na3 is a promising agent for the control of lepidopteran insect pests.
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