TY - JOUR ID - 24657 TI - Overexpression of chimeric chitinase42 enhanced antifungal activity of Trichoderma harzianum against Fusarium graminearum JO - Mycologia Iranica JA - MI LA - en SN - 2382-9664 AU - Kowsari, M. AU - Zamani, M. R. AU - Motallebi, M. AD - Microbial Biotechnology and Biosafety Department, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran AD - National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran Y1 - 2016 PY - 2016 VL - 3 IS - 1 SP - 15 EP - 23 KW - Biocontrol activity KW - Chitin binding domain KW - transformation KW - SoEing PCR DO - 10.22043/mi.2017.44841.1074 N2 - Evidence for the role of chitinases in biocontrol by Trichoderma species has been well documented.Chit42 lacks a chitin–binding domain (ChBD) which is involved in its binding activity to insoluble chitin. The objective of the present study was to enhance antifungal activity of T. harzianum by overexpression of wild type and hybrid forms of Chit42 containing chitin binding domain. To produce chimeric chitinase with improved enzyme activity, the hybrid chitinase was constructed by the adding of ChBD from Rhizopus oligosporus to the C–terminal end of Chit42 cDNA from T. atroviride using SoEing PCR. The recombinant hybrid chitinase (Chit42–ChBD) displayed a 1.56 fold higher chitinase activity than Chit42. This increase suggests that the ChBDmay play a role in helping the enzyme to bind better to the insoluble chitin. Moreover, Chit42–ChBD transformants showed higher antifungal activity towards Fusarium graminearum, the causal agent of Fusarium head blight (FHB) disease in wheat. UR - https://mij.areeo.ac.ir/article_24657.html L1 - https://mij.areeo.ac.ir/article_24657_bad76dfd7d81bc3d123dee58e5c83591.pdf ER -