Cryptogein is a proteinaceous elicitor secreted by Phytophthora cryptogea that can induce resistance to P. parasitica in tobacco plants. On the basis of previous computer modelling experiments, by site-directed mutagenesis a series of cryptogein variants was prepared with altered abilities to bind sterols, phospholipids or both. The sterol binding and phospholipid transfer activities corresponded well with the previously reported structural data. Induction of the synthesis of reactive oxygen species (ROS) in tobacco cells in suspension and proteomic analysis of intercellular fluid changes in tobacco leaves triggered by these mutant proteins were not proportional to their ability to bind or transfer sterols and phospholipids. However, changes in the intercellular proteome corresponded to transcription levels of defence genes and resistance to P. parasitica and structure-prediction of mutants did not reveal any significant changes in protein structure. These results suggest, contrary to previous proposals, that the sterol-binding ability of cryptogein and its mutants, and the associated conformational change in the ω-loop, might not be principal factors in either ROS production or resistance induction. Nevertheless, the results support the importance of the ω-loop for the interaction of the protein with the high affinity binding site on the plasma membrane.

• MeSH
• fosfolipidy metabolismus   MeSH
• fungální proteiny genetika   metabolismus   MeSH
• imunita rostlin imunologie   MeSH
• kyselina chlorogenová analýza   MeSH
• listy rostlin genetika   imunologie   parazitologie   fyziologie   MeSH
• mutace MeSH
• nemoci rostlin imunologie   parazitologie   MeSH
• Phytophthora genetika   metabolismus   patogenita   MeSH
• proteiny genetika   metabolismus   MeSH
• proteomika metody   MeSH
• reaktivní formy kyslíku metabolismus   MeSH
• rekombinantní proteiny MeSH
• seskviterpeny analýza   MeSH
• steroly metabolismus   MeSH
• tabák genetika   imunologie   parazitologie   fyziologie   MeSH
• vazba proteinů MeSH
• vztahy mezi strukturou a aktivitou MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• capsidiol MeSH Prohlížeč
• cryptogein protein, Phytophthora cryptogea MeSH Prohlížeč
• elicitin, Phytophthora MeSH Prohlížeč
• fosfolipidy MeSH
• fungální proteiny MeSH
• kyselina chlorogenová MeSH
• proteiny MeSH
• reaktivní formy kyslíku MeSH
• rekombinantní proteiny MeSH
• seskviterpeny MeSH
• steroly MeSH