Entries by Nanxun Qin

CSN5 of COP9 signalosome modulates heat-response of Arabidopsis (biomolecules)

COP9 signalosome (CSN) is a conserved multi-subunit complex in higher eukaryotes that was originally identified as a regulator of plant photomorphogenesis. It functions by regulating ubiquitin-mediated protein stability, through the deneddylase enzymatic acitivity of the CSN5 subunit. CSN5 is encoded by two genes, and the csn5a-1 mutant shows a deficiency of deneddylation, leading to hyper-neddylation […]

A new B-BOX containing protein regulates red light photomorphogenesis ($) (PNAS)

As the primary red light photoreceptor in Arabidopsis, phyB affects various developmental processes, such as seed germination, shade avoidance, etc. PIF3 is a key repressor of phyB-mediated photomorphogenesis that is degraded in red light. Recently Heng et al. identified a positive regulator of red light signaling designated BBX4. In darkness, BBX4 is targeted by COP1 […]

Synthetic biogenesis of chromoplasts from leaf chloroplasts (bioRxiv)

Chromoplasts are a type of plastid, usually found in fruits and flowers, that can accumulate large amounts of carotenoids including beta-carotene (pro-vitamin A). It has been proposed that increasing chromoplast formation could be a way to enhance human consumption of vitamin A. In a new report, Llorente et al. show that they have promoted chloroplast-to-chromoplast […]

Gene-editing in somatic cells can be achieved by spray-on of carbon dots (bioRxiv)

It’s known to all that plant biotechnology can enhance food security, but there are also inevitable disadvantages of these new approaches. At present, introducing DNA into a plant genome is slow and expensive. Recently, Doyle et al. developed a new method which claims to be simple, inexpensive, fast, and versatile in plant species. They mixed […]

Viewpoint: The Poisonous Pollens, why do they exist? (New Phytol)

Besides being the carrier of male gametes in plants, pollen cells also unexpectedly contained some toxic properties that are collectively called “Pollen Defensive Compounds”. This raises the question: what is the evolutionary significance of these toxic compounds? In this Viewpoint by Rivest and Forrest, three hypotheses are presented, particularly as they pertain to the role […]

A single amino-acid substitution impairs PTI and ETI in an SA-dependent manner in rice ($) (Plant Physiol)

Plants possess two immune strategies to prevent invasion by pathogens called pattern-triggered immunity (PTI, typically mediated by cell-surface receptors) and effector-triggered immunity (ETI). During ETI, intracellular resistance (R) proteins perceive specific pathogen effectors. Tang et al. describe a gain-of-function rice R gene mutant designated as weaker defense (wed), in which disease resistance conferred by both […]

The N-terminus of AtMSL10 interacts with its own C- terminus (bioRxiv)

Plants are equipped with multiple mechanosensitive (MS) ion channels that respond to external and internal mechanical perturbations. When one of these, AtMSL10, is overexpressed it leads to a cell death phenotype, although there is no discernible phenotype associated with its loss of function. Recently Basu et al. demonstrated a novel activation mechanism of AtMSL10 when […]