Plant innate immunity
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Current Opinion in Plant Biology (2012): Plants and pathogens: putting infection strategies and defence mechanisms on the map

Current Opinion in Plant Biology (2012): Plants and pathogens: putting infection strategies and defence mechanisms on the map | Plant innate immunity | Scoop.it

All plant organs are vulnerable to colonisation and molecular manipulation by microbes. When this interaction allows proliferation of the microbe at the expense of the host, the microbe can be described as a pathogen. In our attempts to understand the full nature of the interactions that occur between a potential pathogen and its host, various aspects of the molecular mechanisms of infection and defence have begun to be characterised. There is significant variation in these mechanisms. While previous research has examined plant–pathogen interactions with whole plant/organ resolution, the specificity of infection strategies and changes in both gene expression and protein localisation of immune receptors upon infection suggest there is much to be gained from examination of plant-microbe interactions at the cellular level.

 

Christine Faulkner and Silke Robatzek


Via Nicolas Denancé, Mary Williams, Guogen Yang
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Ann. Rev. Microbio. (2012): Structure and Regulation of the Type VI Secretion System

Ann. Rev. Microbio. (2012): Structure and Regulation of the Type VI Secretion System | Plant innate immunity | Scoop.it

The type VI secretion system (T6SS) is a complex and widespread gram-negative bacterial export pathway with the capacity to translocate protein effectors into a diversity of target cell types. Current structural models of the T6SS indicate that the apparatus is composed of at least two complexes, a dynamic bacteriophage-like structure and a cell-envelope-spanning membrane-associated assembly. How these complexes interact to promote effector secretion and cell targeting remains a major question in the field. As a contact-dependent pathway with specific cellular targets, the T6SS is subject to tight regulation. Thus, the identification of regulatory elements that control T6S expression continues to shape our understanding of the environmental circumstances relevant to its function. This review discusses recent progress toward characterizing T6S structure and regulation.

 

Julie M. Silverman,Yannick R. Brunet, Eric Cascales,and Joseph D. Mougous


Via Nicolas Denancé, Guogen Yang
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