Recent Posts

A moss glycosyltransferase produces a novel cell wall arabinoglucan ($) (Plant Cell)

Plants produce a wide range of polysaccharides in their cell walls, some of which are restricted to certain species. Roberts et al. investigated a moss gene encoding an enzyme that resembles a mixed-linkage (1,3;1,4)-β-glucan (MLG) synthase. When expressed in tobacco, this enzyme produces a novel unbranched,…

Review: The role of auxin in cell wall expansion (OA)

Cell wall is the outermost boundary for a cell. For the protection of cell, it maintains its rigidity. At the same time, for providing the shape of cells, it is capable of becoming flexible. This means that the cell wall has the capacity to maintain both rigidity and flexibility based on the requirement.…

Review: Rubisco is not really so bad ($) (Plant Cell Environ)

The carbon-fixing enzyme Rubisco (Ribulose‐1,5‐bisphosphate carboxylase/oxygenase) is much-maligned and has been described as “sluggish” and with “confused specificity”. In this new Review, Bathellier et al. argue that it is “not really so bad”. Their reasoning is that when Rubisco’s…

Crystal structure and pH dependency of peptidase & ligase activity in Arabidopsis legumain (Plant Cell)

Legumains are proteins identified first from legumes that have subsequently been identified in other organisms. They are also described as asparaginyl endopeptidases (AEPs) and vacuolar cysteine proteases or vacuolar processing enzymes. Enzymatically, legumains can express peptidase and peptide ligase…

A family of small, cyclic peptides buried in preproalbumin since the Eocene epoch (Plant Direct)

Small cyclic peptides are produced in many organisms; some are produced by ribosomes and others not. Fisher et al. explore a class of small cyclic peptides known as orbitides, which have been identified in plants of Asteroideae subfamily of the plant family Asteraceae. The fact that these are abundant…

Complete enzyme set for chlorophyll biosynthesis in Escherichia coli (Sci. Adv.)

Although the reactions and enzymes involved in the biosynthesis of chlorophyll are well known, the entire pathway has never before been reconstituted in a non-photosynthetic organism. Chen et al. have done this. The cells (E. coli) expressing the full pathway accumulate chlorophyll and look green! However,…

Ribosome Production Under Surveillance

Maekawa et al. find a ribosome production monitoring system in Arabidopsis thaliana Plant Cell (2017) https://doi.org/10.1105/tpc.17.00778 By Shugo Maekawa, Tetsuya Ishida, Shuichi Yanagisawa Background: Protein is produced by ribosomes consisting of a number of proteins and several RNAs (ribosomal…

Structure of KDM5 Gives Insight to Histone Demethylation

Yang et al. reveal a conserved H3K4me3 recognition mechanism shared by both plant and animal KDM5 histone demethylases. The Plant Cell (2017). https://doi.org/10.1105/tpc.17.00666 By Z. Yang, Q. Qiu, X. Cao and J. Du Background: Histone methylation is a conserved gene regulation mechanism in plants…

Recruiter of Chromatin Regulators

Hohenstatt et al. describe a new recruiter of PcG chromatin regulators affecting flowering and meristem identity in Arabidopsis. https://doi.org/10.1105/tpc.17.00117 By Pawel Mikulski 1) BACKGROUND: Polycomb group (PcG) proteins are key regulatory proteins involved in maintaining the ability (and…