Recent Posts

Structural insights into photosystem II assembly (Nature Plants)

Photosystem II is a multisubunit enzyme complex in the thylakoid membranes of plant, algae, and cyanobacteria. Here, Zebret et al. used cryo-electron microscopy to produce high-resolution structural information of the intermediate complexes involved in the biogenesis and assembly of photosystem II from…

The structure of a triple complex of plant photosystem I with ferredoxin and plastocyanin (Nature Plants)

Photosystem I (PSI) is a membrane-bound protein complex that plays a central role in the conversion of solar energy to chemical energy to drive assimilate production.  Photosystem I is an enzyme complex that transfers electrons from plastocyanin (Pc) to ferredoxin (Fd). Here Caspy et al. have characterized…

Structural basis of salicylic acid perception by Arabidopsis NPR proteins (Nature) ($)

Salicylic acid (SA) is a critical hormone in plant-pathogen responses. The main receptors of this hormonal signal are a small family of NPR proteins (NONEXPRESSOR OF PATHOGENESIS-RELATED GENES). Although NPR1 is a positive regulator of defense signaling, NPR3 and NPR4 serve as negative regulators; they…

Structural basis of unidirectional energy transfer in Porphyridium purpureum phycobilisome (Nature)

Cyanobacteria and red algae employ phycobilisomes (PBSs) as light-harvesting systems to adapt to fluctuating environments. PBSs are composed of phycobiliproteins, linker proteins and chromophores. Ma et al. used cryo-EM to determine the 2.82 Å structure of  the very large (14.7-megadalton, 706 protein…

Flexibility of intrinsically disordered degrons in AUX/IAA proteins reinforces auxin receptor assemblies ($) (BioRxiv)

Auxin is involved in multiple plant development and stress response which necessitates complexity in auxin signaling. Auxin at a particular threshold in the cells brings together the TIR1/AFB1-5 (TRANSPORT INHIBITOR RESPONSE1/ AUXIN SIGNALING F-BOX 1-5) members and members of the 29 Aux/IAA members bound…

Plant Science Research Weekly: October 18

Guest Editor : Suresh Damodaran I am a postdoctoral research associate in Dr. Lucia Strader’s lab at WUSTL. My primary area of interest is understanding the role of plant hormones in development. I completed my graduate degree in Dr. Sen Subramanian’s lab at SDSTATE.  Twitter: @SureshDamod   Design…

Review: Structural biology of cell surface receptor–ligand interactions (COPB)

In recent months, a flurry of papers have come out that reveal new insights into the structural interactions of cell-surface receptors with each other and with their ligands. This timely review by Moussu and Santiago captures the highlights, in case you haven’t been following along. The review features…

Recognition of sequence-divergent CIF peptides by the plant receptor kinases GSO1/SGN3 and GSO2 (bioRxiv)

SCHENGEN 3 [SGN3, also known as GASSHO1 (GSO1)] is a leucine-rich repeat receptor kinase (LRR-RK) previously shown to interact with CIF peptides (CASPARIAN STRIP INTEGRITY FACTORS) to regulate the development of the Casparian strip boundary in roots. Here, Okuda et al. characterize the CIF/LRR-RK interaction.…

Structural basis for recognition of RALF peptides by LRX proteins during pollen tube growth (bioRxiv)

RALFs (Rapid Alkalinization Factors, based on historical observations that they induce alkalization of the extracellular space) are signaling peptides with diverse roles. RALF4 is required for pollen tube growth and guidance through its interactions with CrRLK1Ls and leucine-rich extension (LRX) proteins.…