plant-structure
Plant structure, or plant anatomy, is the study of the internal organization of tissues and cells within plants, typically examined through microscopy and histological sectioning. Understanding internal plant structure is fundamental to plant physiology, as it reveals how cellular and tissue organization enables critical functions like nutrient transport, growth, and environmental adaptation. This knowledge is essential for advancing plant biology research, improving agricultural practices, and developing crop varieties with enhanced performance.
open_in_new WikipediaPubMed · 2026-05-16
Scientists solved the 3D structure of two enzymes that team up to build xyloglucan, a flexible sugar-chain polymer woven into plant cell walls. The discovery reveals how one enzyme's 'stem arm' physically docks with its partner—an interaction that controls how these molecular machines pair up and work together.
Crystal structures of the XXT2-XXT5 enzyme pair confirm they form an obligatory heterodimer — they must work as a locked pair, not independently, to fully build the xyloglucan chain.
XXT5 contains a secondary binding pocket that likely cradles a partly-built xyloglucan chain, suggesting the two enzymes hand off and extend the chain in a coordinated sequence.
A short 'stem' segment of XXT2 physically contacts XXT5 to drive pairing; this interaction is absent in a related homodimer (XXT1), identifying stem regions as a general switch controlling how glycosyltransferase enzymes oligomerize.