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Preventing inappropriate signals pre- and post-ligand perception by a toggle switch mechanism of ERECTA.
Proc Natl Acad Sci U S A
January 2025
HHMI, The University of Texas at Austin, Austin, TX 78712.
Dynamic control of signaling events requires swift regulation of receptors at an active state. By focusing on the Arabidopsis ERECTA (ER) receptor kinase, which perceives peptide ligands to control multiple developmental processes, we report a mechanism preventing inappropriate receptor activity. The ER C-terminal tail (ER_CT) functions as an autoinhibitory domain: Its removal confers higher kinase activity and hyperactivity during inflorescence and stomatal development.
View Article and Find Full Text PDFStructural mechanism underlying PHO1;H1-mediated phosphate transport in Arabidopsis.
Nat Plants
January 2025
National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
Arabidopsis PHOSPHATE 1 (AtPHO1) and its closest homologue AtPHO1;H1 are phosphate transporters that load phosphate into the xylem vessel for root-to-shoot translocation. AtPHO1 and AtPHO1;H1 are prototypical members of the unique SPX-EXS family, whose structural and molecular mechanisms remain elusive. In this study, we determined the cryogenic electron microscopy structure of AtPHO1;H1 binding with inorganic phosphate (Pi) and inositol hexakisphosphate in a closed conformation.
View Article and Find Full Text PDFEmergence of SARS-CoV-2 subgenomic RNAs that enhance viral fitness and immune evasion.
PLoS Biol
January 2025
RNA Virus Replication Laboratory, The Francis Crick Institute, London, United Kingdom.
Coronaviruses express their structural and accessory genes via a set of subgenomic RNAs, whose synthesis is directed by transcription regulatory sequences (TRSs) in the 5' genomic leader and upstream of each body open reading frame. In SARS-CoV-2, the TRS has the consensus AAACGAAC; upon searching for emergence of this motif in the global SARS-CoV-2 sequences, we find that it evolves frequently, especially in the 3' end of the genome. We show well-supported examples upstream of the Spike gene-within the nsp16 coding region of ORF1b-which is expressed during human infection, and upstream of the canonical Envelope gene TRS, both of which have evolved convergently in multiple lineages.
View Article and Find Full Text PDFA Structural Model of Truncated Gaussia princeps Luciferase Elucidating the Crucial Catalytic Function of No.76 Arginine towards Coelenterazine Oxidation.
PLoS Comput Biol
January 2025
College of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou, People's Republic of China.
Gaussia Luciferase (GLuc) is a renowned reporter protein that can catalyze the oxidation of coelenterazine (CTZ) and emit a bright light signal. GLuc comprises two consecutive repeats that form the enzyme body and a central putative catalytic cavity. However, deleting the C-terminal repeat only limited reduces the activity (over 30% residual luminescence intensity detectable), despite being a key part of the cavity.
View Article and Find Full Text PDFSEM-2/SoxC regulates multiple aspects of C. elegans postembryonic mesoderm development.
PLoS Genet
January 2025
Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America.
Development of multicellular organisms requires well-orchestrated interplay between cell-intrinsic transcription factors and cell-cell signaling. One set of highly conserved transcription factors that plays diverse roles in development is the SoxC group. C.
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