In plants, interference by RNA (or RNAi) is one of the major defence mechanisms against viruses. At the heart of this machinery, the Argonaute1 protein (AGO1) is the target of certain viral proteins called RNAi suppressors (VSR) such as the Turnip Yellow Virus P0 protein. Researchers at the Institut de biologie moléculaire des plantes (IBMP) – (CNRS/Université de Strasbourg) have now deciphered the association of PO and AGO1 with endoplasmic reticulum and the mechanism that leads to the specific degradation of AGO1 in the vacuole. The study is published in PNAS.
Clouds are formed from water droplets that form in the atmosphere around fine particles called aerosols. Air pollutants contribute significantly to the formation of these aerosols. A team from the Institut de physique des 2 infinis de Lyon (IP2I ‒ Université Claude Bernard Lyon 1 / CNRS) in collaboration with researchers in Grenoble, Austria and Japan, says it has just discovered a hitherto unknown process in which the first steps in the formation of atmospheric aerosols are promoted by the presence of pyridine. This molecule produced in abundance by human activity thus influences the formation of clouds and therefore the climate. The work is also reported in PNAS.
Finally, a new study by Earth scientists from an international team including researchers at the University of Southern California, Los Angeles, the Woods Hole Oceanographic Institution, the Chinese Academy of Sciences, Western Washington University and the Centre de Recherches Pétrographiques et Géochimiques, CNRS, Université de Lorraine has revealed that flooding from torrential rains caused by cyclones and monsoonal storms, as well as other catastrophic events, are responsible for moving huge amounts of fresh wood to a watery grave deep under the ocean . The research, again published in the Proceedings of the National Academy of Sciences, shows the first-ever evidence that trees may travel thousands of miles from their mountain homes to settle in the vast sediments extending under the sea from river mouths.