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Updated: Feb 2, 2026
09:57
A Versatile Method of Patterning Proteins and Cells
Published on: February 26, 2017
9.8K
The immunity-associated protein ACIP1 counteracts MIDD1 to coordinate xylem cell wall patterning
Akiho Miyake1, Yuki Sugiyama2, Takema Sasaki1
1Department of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
Current Biology : CB
|January 31, 2026
Summary
Plant xylem vessel cell wall patterning is regulated by two opposing pathways. Acetylated interacting protein 1 (ACIP1) inhibits cell wall spacing, while the microtubule depletion domain 1 (MIDD1) pathway promotes it, coordinating xylem architecture.
Area of Science:
- Plant Biology
- Cell Biology
- Plant Physiology
Background:
- Cell wall patterning in plant xylem vessels is critical for water transport efficiency.
- Cortical microtubules guide patterned cell wall deposition in xylem.
- The microtubule depletion domain 1 (MIDD1) pathway regulates cell wall spacing in xylem vessels.
Purpose of the Study:
- To investigate the regulatory network of cell wall patterning in xylem vessels.
- To identify novel pathways involved in xylem cell wall spacing.
- To explore the link between xylem architecture and plant immunity.
Main Methods:
- Analysis of acip1 loss-of-function mutants and ACIP1 overexpression lines.
- Phenotypic analysis of ACIP1 and midd1 midd2 double mutants.
- In vitro localization studies of ACIP1 and observation of microtubule dynamics upon ACIP1 overexpression.
Main Results:
- Acetylated interacting protein 1 (ACIP1) inhibits cell wall spacing in protoxylem vessels.
- ACIP1 functions independently of the MIDD1 pathway, acting antagonistically.
- ACIP1 localizes to microtubules and influences their organization, negatively regulating cell wall spacing.
Conclusions:
- A novel antagonistic mechanism involving ACIP1 and MIDD1 pathways coordinates cell wall patterning in protoxylem vessels.
- ACIP1 acts as a negative regulator of cell wall spacing via microtubule interaction.
- Findings suggest a potential link between xylem vessel architecture and plant immune responses.
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