Pathogenesis-related protein

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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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  2. Campbell, N.A. and Reece, J.B. (2005). Biology (7th ed). San Francisco: Benjamin Cummings.
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Further reading

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