5gnc
Crystal structure of Phytophthora. sojae PSR2
Structural highlights
FunctionPSR2_PHYSO Secreted effector that possesses RNA silencing suppression activity by inhibiting the biogenesis of small RNAs in the host plant to promote enhanced susceptibility of host to the pathogen during infection (PubMed:23377181, PubMed:25387135, PubMed:30595554). Interferes with secondary siRNA production by associating with host dsRNA-binding protein DRB4 (PubMed:30595554). Inhibits the host salicylic acid pathway during infection (PubMed:25387135).[1] [2] [3] Publication Abstract from PubMedPhytophthora are eukaryotic pathogens that cause enormous losses in agriculture and forestry. Each Phytophthora species encodes hundreds of effector proteins that collectively have essential roles in manipulating host cellular processes and facilitating disease development. Here we report the crystal structure of the effector Phytophthora suppressor of RNA silencing 2 (PSR2). PSR2 produced by the soybean pathogen Phytophthora sojae (PsPSR2) consists of seven tandem repeat units, including one W-Y motif and six L-W-Y motifs. Each L-W-Y motif forms a highly conserved fold consisting of five alpha-helices. Adjacent units are connected through stable, directional linkages between an internal loop at the C terminus of one unit and a hydrophobic pocket at the N terminus of the following unit. This unique concatenation results in an overall stick-like structure of PsPSR2. Genome-wide analyses reveal 293 effectors from five Phytophthora species that have the PsPSR2-like arrangement, that is, containing a W-Y motif as the "start" unit, various numbers of L-W-Y motifs as the "middle" units, and a degenerate L-W-Y as the "end" unit. Residues involved in the interunit interactions show significant conservation, suggesting that these effectors also use the conserved concatenation mechanism. Furthermore, functional analysis demonstrates differential contributions of individual units to the virulence activity of PsPSR2. These findings suggest that the L-W-Y fold is a basic structural and functional module that may serve as a "building block" to accelerate effector evolution in Phytophthora. Structural analysis of Phytophthora suppressor of RNA silencing 2 (PSR2) reveals a conserved modular fold contributing to virulence.,He J, Ye W, Choi DS, Wu B, Zhai Y, Guo B, Duan S, Wang Y, Gan J, Ma W, Ma J Proc Natl Acad Sci U S A. 2019 Mar 29. pii: 1819481116. doi:, 10.1073/pnas.1819481116. PMID:30926664[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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