In plants and algae, isoamylases drive phytoglycogen-to-amylopectin conversion. Here, the authors show that ISA1 and ISA2 form a heterocomplex that coordinately trims glucan branches to promote starch granule formation, defining a key step in starch biosynthesis.
- Rong Fan
- Zeyuan Guan
- Junjie Yan
