Recent Posts

Moonlighting Role of Plastidial NAD-MDH

Schreier et al. investigate the role of a plastid malate dehydrogenase in early chloroplast development. Plant Cell 30: 1745-1769 Background: Malate dehydrogenases (MDH) are enzymes that are widespread in prokaryotes and eukaryotes. MDH interconverts oxaloacetate and malate, using either NAD or…

SHOU4 proteins regulate trafficking of cellulose synthase complexes to the plasma membrane (Curr. Biol.)

Plant cell walls provide mechanical support and define the extent and direction of cell expansion. Regulation of cellulose synthase determines cell wall load bearing and involves the receptor like kinases FEI1/FEI2. To gain further understanding of cell wall integrity regulation Polko et al. performed…

Carboxysome encapsulation of the CO2-fixing enzyme Rubisco in tobacco chloroplasts (Nature Comms.)

One of the fundamental challenges facing terrestrial plants occurs when CO2 levels are depleted at Rubisco, causing its inefficient oxygenase activity to dominate. Some plants minimize this problem by adding a carbon-fixing step upstream of Rubisco, and various algae and cyanobacteria sequester Rubisco…

CLASP sustains cell proliferation through a brassinosteroid signaling negative feedback loop ($) (Curr. Biol.)

Brassinostreroid (BR) regulates the development of the root apical meristem. High levels of BR have inhibitory effects on cell production rates in the meristem and low levels show the opposite effect. Ruan, Halat et al. showed that BR regulates microtubule-associated CLASP (CLIP-Associated Protein) expression…

S-Sulfhydration Disrupts Actin Polymerization

Recent evidence indicates that H2S acts as an important messenger that affects plant responses to abiotic stresses, including high salinity, drought, heat shock, heavy metals, and oxidative stress. H2S signaling has also been shown to modulate important physiological processes, such as photosynthesis,…

SNARE proteins in replication vesicle trafficking of turnip mosaic virus ($) (Plant Cell)

When plant cells are infected by RNA viruses, viral replication complexes are generated in organelle-like structures. These vesicles are important for the replication of viral RNA (vRNA) as well as moving vRNA-protein complexes through plasmodesmata to infect other plant cells. When turnip mosaic virus…

Arabidopsis Formin 2 regulates cell-to-cell trafficking through plasmodesmata (eLIFE)

Plasmodesmata are cell-cell junctions that form cytosolic channels between neighboring plant cells. These junctions mediate the exchange of information between cells during various stress and developmental programs by actively regulating the aperture of the channel entrance or ‘pore’. In a new study…

Predicting division planes of three-dimensional cells by soap-film minimization ($) (Plant Cell)

Martinez et al. used a modelling approach to see if it is possible to predict the location of a cell’s future division plane. In most cases the cell divides according to strict geometric rules, such that the newly formed wall will have a minimum area (described as a soap-film minimization model). However,…

Ploidy and size at multiple scales in the Arabidopsis sepal (Plant Cell)

Ploidy refers to the number of genomes contained within a nucleus. Ploidy levels can increase through whole-genome duplication, which affects every cell equally, and through endoreduplication, a cell-by-cell process in which DNA synthesis is not accompanied by cytokinesis. Robinson et al. investigated…