Kang, Ji Eun Jeon, Byeong Jun Park, Min Young Yang, Hye Ji Kwon, Jae Young Lee, Dong Ho Kim, Beom Seok 2024-01-19T17:04:16Z 2024-01-19T17:04:16Z 2021-09-05 2020-07 1526-498X https://pubs.kist.re.kr/handle/201004/118445 BACKGROUND The bacterial type III secretion system (T3SS) is one of the virulence determinants of Gram-negative bacteria through which various effector and virulence proteins are translocated into host cells. RESULTS We constructed an assay system to screen inhibitors of hrpA gene expression (a structural gene of Hrp pili) in Pseudomonas syringae pv. tomato DC3000. In a plant extract library screening, the root extract of Vitis vinifera L. displayed the most prominent activity. Three resveratrol oligomers, hopeaphenol, isohopeaphenol and ampelopsin A, were identified in grapevine root extract, which significantly reduced the transcription levels of the hrpA, hrpL and hopP1 genes without growth retardation. Additional resveratrol derivatives identified in other plant extracts were also examined for their inhibitory effect on hrpA expression. Another resveratrol oligomer, kobophenol A, also inhibited the transcription of the hrpA gene and other T3SS-related genes, while resveratrol monomers (resveratrol and piceatannol) were not effective. The severity of bacterial specks was reduced by each hopeaphenol, isohopeaphenol and ampelopsin A treatment. CONCLUSION These results show the potential of resveratrol derivatives as anti-virulence agents for the control of plant diseases. English JOHN WILEY & SONS LTD EFFECTOR PROTEINS HRP PILUS DISCOVERY INFECTION PATHOGEN DISEASE MEMBERS Inhibition of the type III secretion system of Pseudomonas syringae pv. tomato DC3000 by resveratrol oligomers identified in Vitis vinifera L Article 10.1002/ps.5764 1 PEST MANAGEMENT SCIENCE, v.76, no.7, pp.2294 - 2303 PEST MANAGEMENT SCIENCE 76 7 2294 2303 scie scopus 000512368300001 2-s2.0-85079400702 Agronomy Entomology Agriculture Entomology Article EFFECTOR PROTEINS HRP PILUS DISCOVERY INFECTION PATHOGEN DISEASE MEMBERS Pseudomonas syringae pv tomato bacterial speck type III secretion system inhibitor resveratrol oligomer