Pathogenesis-related protein
Pathogenesis-related (PR) proteins are proteins produced in plants in the event of a pathogen attack.[1] They are induced as part of systemic acquired resistance. Infections activate genes that produce PR proteins. Some of these proteins are antimicrobial, attacking molecules in the cell wall of a bacterium or fungus. Others may function as signals that spread “news” of the infection to nearby cells. Infections also stimulate the cross-linking of molecules in the cell wall and the deposition of lignin, responses that set up a local barricade that slows spread of the pathogen to other parts of the plant.[2]
Salicylic acid plays a role in the resistance to pathogens by inducing the production of pathogenesis-related proteins.[3]
Many proteins found in wine are grape pathogen-related proteins.[4] Those include thaumatin-like proteins and chitinases.
Functions
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- An important common function of most PRs is their antifungal effects
- Some PRs also exhibit antibacterial, insecticidal or antiviral action.
- Function as signals that spread “news” of the infection to nearby cells.
- Infections also stimulate the cross-linking of molecules in the cell wall and the deposition of lignin, responses that set up a local barricade that slows spread of the pathogen to other parts of the plant
- Chitinase activity
- Peroxidase, ribonuclease and lysozyme activities
- Their hydrolytic, proteinase-inhibitory and membrane-permeabilizing ability.
- They inactivate the proteins secreted by the parasites in the invaded plant tissues
See also
References
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