Entries by Estee Tee

Too Much, Take it Back: PAP Moves from the Cytosol to Plastids and Mitochondria for Degradation via PAPST2

Plants need to strike a fine balance between the production, transport, and degradation of stress signals in order to optimize growth in fluctuating environmental conditions. The signal 3’phosphoadenosine 5’phosphate (PAP) accumulates during drought and light stress and induces stress-responsive gene expression (Estavillo et al., 2011). Sulfur transfer from 3’phosphoadenosine 5’phosphosulfate (PAPS) to acceptor compounds in […]

Uncovering the Steps Before: Sulfate Induces ABA Biosynthesis and Stomatal Closure

Plant stomatal aperture regulation via guard cells is an example of how plants dynamically process environmental signals to induce a physiological response. The drought stress hormone abscisic acid (ABA) is a well-characterized signal that induces stomatal closure, preventing water loss. ABA acts via the PYRABACTIN RESISTANCE (PYR)/PYR LIKE (PYRL)-ABA INSENSITIVE1 (ABI1)-OPEN STOMATA1 (OST1) receptor-phosphatase-kinase core […]

Active Support: GHR1 is a Pseudokinase that acts as a Scaffolding Component

Plants balance CO2 uptake with water loss via a complex network of signals regulating stomatal aperture size. Stomata close in response to a number of stimuli, including drought, low light intensity, low air humidity, elevated intercellular CO2 concentration, pathogens, and certain air-borne chemicals or pollutants such as ozone. After plants perceive these triggers, multiple signaling […]