Recent Posts

Protein Delivery Address Codes Are Part of the Circuitry Adjusting Tissue-Specific Plastid Proteomes

Chu et al. demonstrate that a special address code is required for efficient protein import into root plastids. Plant Cell https://doi.org/10.1105/tpc.19.00702 By Hsou-min Li, Institute of Molecular Biology, Academia Sinica, Nankang, Taipei 11529, Taiwan Background: Chloroplasts are the most famous…

The photosystem factory in chloroplasts

Sun et al. reveal the subcellular organization of photosystem biogenesis in Chlamydomonas. Plant Cell https://doi.org/10.1105/tpc.19.00263 by Melissa Valente-Paterno, Yi Sun and William Zerges. Department of Biology, Concordia University.  Background: Cells localize intracellular processes to…

Arabidopsis OR Represses the Greening of Cotyledons while It Is in the Nucleus

Sun et al. showed that OR interacts with TCP14 in the nucleus of dark-germinated seedlings and reduces chlorophyll biosynthesis, thylakoid membrane development and expression of EARLY LIGHT-INDUCIBLE PROTEINS, and that subsequent illumination relieves this repression. Plant Cell https://doi.org/10.1105/tpc.…

The “Ins and Outs” of ER–Chloroplast Lipid Trafficking

Karki et al. revisit the long-standing question of how and where lipid trafficking occurs during galactolipid synthesis. They report evidence for metabolically distinct pools of phosphatidylcholine, suggesting an underlying spatial organization in the ER–chloroplast metabolic interactions. Plant Cell…

An Unexpected Role of a Phosphatase-like Protein in Starch Degradation

Schreier et al. uncover the surprising role played by the glucan phosphatase family member, LIKE SEX4 1, as a protein scaffold on the starch granule surface that binds β-amylases. Plant Cell https://doi.org/10.1105/tpc.19.00089. By Tina B. Schreier1,2 and Samuel C. Zeeman1 1 Institute of Molecular…

A chloroplast-localized mitochondrial calcium uniporter transduces osmotic stress in Arabidopsis (Nature Plants)

Calcium and chloroplasts are both at the heart of the signal transduction during environmental stress. Teardo et al. studied whether the chloroplast-localized mitochondrial calcium uniporter has a role in stress signaling. The group identified 6 homologs of mitochondrial calcium uniporter (MCU) in Arabidopsis,…

HvCMF7 – a Key Switch of Chloroplast Differentiation in Barley

Li et al. identify the gene underlying the long-studied variegated albostrians mutant of barley. Plant Cell https://doi.org/10.1105/tpc.19.00132 By Mingjiu Li, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Germany Background: Chloroplasts are the site of photosynthesis, which…

An RNA-chaperone-like Protein in Chloroplasts

Jiang et al. isolated a plastid-localized RNA-chaperone-like protein and investigated its function. Plant Cell https://doi.org/10.1105/tpc.18.00946.  By Jingjing Jiang, Xin Chai, Nikolay Manavski, and Wei Chi  Background: RNA folding, which underlies the formation of RNA structure, is important…

Physiological performance of transplastomic tobacco plants overexpressing aquaporin AQP1 in chloroplast membranes (JXB)

A major factor in determining photosynthetic rate is the availability of CO2 at the site of fixation in the chloroplast stroma.  Classically, this has been thought to be mainly limited by stomatal conductance (diffusion from the air, through stomata, to sub-stomatal cavities).  However, more recently…