Recent Posts

Subdivision of light signaling networks contributes to partitioning of C4 photosynthesis (Plant Physiol)

Some plants such as Zea mays partition different components of the photosynthetic pathway in mesophyll cells (MC) and bundle sheath cells (BSC) in a process known as two-cell C4 photosynthesis. For example, light-harvesting reactions carried out by photosystem I and II (PSI and PSII) occur only in the…

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…

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…

Coordinated regulation of pre-mRNA splicing by the SFPS-RRC1 complex to promote photomorphogenesis ($) (Plant Cell)

Phytochromes are a family of red/far-red light photoreceptors, which positively regulate photomorphogenesis upon red-light perception. Photomorphogenesis is driven by light-induced global transcriptional reprogramming, of which phytochromes are one of the most important regulators. In addition to transcriptional…

A phyB-PIF1-SPA1 kinase regulatory complex promotes photomorphogenesis in Arabidopsis (OA) (Nature Communications)

CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) is one of the best characterized E3 ubiquitin ligases with broad roles as a central repressor of light signaling in plants to cancer biology in mammals. In plants, COP1 interacts with SUPPRESSOR OF PHYA-105 1 family members (SPA1-SPA4) and forms a stable COP1/SPA…

Arabidopsis PP6 phosphatases dephosphorylate PIF proteins to repress photomorphogenesis (PNAS)

In the absence of light, plants undergo skotomorphogenesis, characterized by longer hypocotyls, closed and yellowish cotyledons, and apical hooks. in the presence of light, they undergo photomorphogenesis, with inhibited hypocotyl elongation, and open and expanded green cotyledons. Light also modulates…

COP1 can be hijacked by photoreceptors via their VP motifs (EMBO J)

Plant development is characterized by a high degree of plasticity in response to light. Light‐activated plant photoreceptors bind and inhibit the E3 ubiquitin ligase COP1, thus protecting downstream transcription factors from degradation. However, the detailed mechanisms of how COP1 can function between…

Multi-level modulation of light signaling by GIGANTEA regulates both the output and pace of the circadian clock ($) (Devel Cell)

The daily cycle of light and dark controls many facets of plant growth and development, but these cycles depend on and are most efficient when integrated with the rhythms of the circadian clock. Nohales et al. have identified a key mechanism that directly links the regulation of light-responsive genes…

The macroevolutionary history of light signaling ($) (Mol Plant)

The ability to sense and respond to light is a fundamental feature of photosynthetic organisms like plants. Much has been learned about the molecular genetic mechanisms controlling light perception and downstream signaling processes in evolutionarily young land plant lineages like angiosperms, with comparatively…