organelle-biology
Organelle-biology is the study of the structure and function of specialized cellular compartments within plant cells. This field is fundamental to plant science because organelles like chloroplasts and vacuoles are essential for photosynthesis, energy storage, and the distinctive cellular architecture that characterizes plant physiology. Understanding how organelles function and interact provides critical insights into plant metabolism, development, and responses to environmental stress.
PubMed · 2026-02-19
A new protein called FtsZ3 controls how plant chloroplasts divide in mosses and related plants by regulating the assembly and constriction of the chloroplast division machinery. This discovery reveals an evolutionary mechanism that could explain how organelle division differs across plant lineages.
FtsZ3 localizes to chloroplasts in hornwort, moss, and lycophyte as a stromal component of the chloroplast division machinery (CDM)
FtsZ3 has two distinct functions: its GTPase domain regulates self-assembly and restrains FtsZ2 beneath the inner envelope membrane, while its C-terminal motif interacts with ARC6 protein to enable chloroplast envelope constriction
FtsZ3 exhibits functional divergence from FtsZ2, revealing a previously unknown regulatory mechanism for chloroplast division across non-vascular plant lineages
