Identification, subcellular localization and some properties of a cysteine-rich suppressor of gene silencing encoded by peanut clump virus.
In plants, post-transcriptional gene silencing (PTGS) is part of a defence mechanism against virus infection. Several plant viruses have been shown to encode proteins which can counteract PTGS. In this paper it is demonstrated that P15 of peanut clump pecluvirus (PCV) has anti-PTGS activity. P15 is a small cysteine-rich protein with no sequence similarity to previously described PTGS-suppressor proteins which has several novel properties. It possesses four C-terminal proximal heptad repeats that can potentially mediate a coiled-coil interaction and is targeted to peroxisomes via a C-terminal SKL motif. The coiled-coil sequence is necessary for the anti-PTGS activity of P15, but the peroxisomal localization signal is not, although it is required for efficient intercellular movement of the virus.
Dunoyer
Patrice
P
Institut de Biologie Moléculaire des Plantes du CNRS et de l'Université Louis Pasteur, 12 Rue du Général Zimmer, 67084 Strasbourg, France.
Pfeffer
Sébastien
S
Fritsch
Christiane
C
Hemmer
Odile
O
Voinnet
Olivier
O
Richards
K E
KE
D000595:Amino Acid Sequence; D010367:Arachis / Q000821:virology; D002478:Cells, Cultured; D003001:Cloning, Molecular; D003545:Cysteine / Q000235:genetics; D020868:Gene Silencing; D020676:Glyoxysomes / Q000378:metabolism; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D020675:Peroxisomes / Q000378:metabolism; D010935:Plant Diseases / Q000821:virology; D010942:Plant Viruses / Q000235:genetics* / Q000254:growth & development; D030821:Plants, Genetically Modified; D017386:Sequence Homology, Amino Acid; D014026:Nicotiana / Q000166:cytology / Q000235:genetics* / Q000821:virology; D014764:Viral Proteins / Q000235:genetics / Q000502:physiology*
D008164:Luminescent Proteins; D014764:Viral Proteins; D049452:Green Fluorescent Proteins; D003545:Cysteine