Recent Posts

Secret Talents: STARCH SYNTHASE 5—Not an Enzyme, but Very Active!

Abt et al. found that Arabidopsis SS5, a protein homologous to typical starch-synthesizing enzymes, is itself enzymatically inactive, but rather has an important role in the starch granule initiation process. Plant Cell https://doi.org/10.1105/tpc.19.00946 By Melanie R. Abt and Samuel C. Zeeman, Institute…

Guard cell starch-derived glucose drives fast stomatal opening kinetics

Flütsch et al. examine how starch degradation and light-regulated membrane transport control stomatal opening kinetics. Plant Cell https://doi.org/10.1105/tpc.18.00802 By Sabrina Flütsch and Diana Santelia Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland Background: Stomatal…

Brassinosteroids and H2O2 Regulate Guard Cell Starch Metabolism

Li et al. demonstrate that the BR and H2O2 interdependently promote guard cell starch degradation and stomatal opening in Arabidopsis. Plant Cell https://doi.org/10.1105/tpc.19.00587 By Jin-Ge Li, Min Fan, Wenbo Hua, Yanchen Tian, and Ming-Yi Bai The Key Laboratory of Plant Development and…

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…