Three proteins coordinate membrane delivery and scaffold reshaping during plant cell division
Elliott L, Yamada M, Kalde M, Hála M, Smertenko A
Plant Signaling
Every leaf unfurling, every root tip pushing through soil, every fruit swelling on the vine depends on billions of cells dividing cleanly — and this discovery reveals the precise molecular handshake that keeps that process from going wrong.
When a plant cell divides, it has to build a brand-new wall right down the middle, assembling it from tiny membrane packages delivered to exactly the right spot. Scientists found three proteins that work as a team to guide those packages to the center of the dividing cell while also reshaping the internal scaffolding that holds everything in position. Without this coordinated team, cell division stalls or goes off course, which would disrupt growth throughout the entire plant.
Key Findings
A three-component module — the GTPase RAB-A2a, Class II Kinesin-12 motor proteins, and the kinase TIO — physically interact at the midzone during cell division in Arabidopsis.
Different members of the Class II Kinesin-12 family perform distinct roles at the leading versus lagging edges of the growing cell plate, revealing functional specialization within the same protein family.
Disrupting this module impairs both vesicle targeting to the division plane and phragmoplast remodeling, confirming that membrane trafficking and cytoskeletal reorganization are mechanistically coupled rather than parallel independent processes.
chevron_right Technical Summary
Researchers identified a three-part molecular switch in Arabidopsis that coordinates how dividing plant cells build the new wall between daughter cells, linking the delivery of membrane material to the machinery that physically organizes the division site.
Abstract Preview
Original paper
A Rab/Kinesin-12/kinase module couples vesicle delivery and phragmoplast dynamics during plant cell cytokinesis.
Cytokinesis is a key process in the development of multicellular organisms, through both formative and proliferative divisions. In land plants, successful cytokinesis requires precise targeting of ...
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