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In vivo and in vitro Studies of Adaptor-clathrin Interaction
Published on: January 26, 2011
Arabidopsis CLV3 peptide directly binds CLV1 ectodomain
Mari Ogawa1, Hidefumi Shinohara, Youji Sakagami
1Graduate School of Bio-Agricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan.
Science (New York, N.Y.)
|January 19, 2008
Summary
The CLV3 peptide directly binds the CLV1 receptor, confirming their role as a ligand-receptor pair. This interaction is crucial for maintaining stem cell populations in Arabidopsis shoot apical meristem.
Area of Science:
- Plant biology
- Molecular genetics
- Developmental biology
Background:
- The CLV1 (CLAVATA1) receptor kinase and CLV3 (CLAVATA3) peptide are key regulators of stem cell homeostasis in the Arabidopsis shoot apical meristem.
- They function within the same genetic pathway to control meristem size and organization.
Purpose of the Study:
- To provide direct biochemical evidence for the interaction between the CLV3 peptide and the CLV1 receptor.
- To characterize the binding affinity and specificity of this ligand-receptor interaction.
Main Methods:
- Ligand binding assays were employed to quantify the interaction between CLV3 and CLV1.
- Photoaffinity labeling was used to confirm direct binding of the CLV3 peptide to the CLV1 ectodomain.
Main Results:
- Direct binding of the CLV3 peptide to the CLV1 ectodomain was demonstrated with a dissociation constant (Kd) of 17.5 nM.
- The CLV1 ectodomain also exhibited interactions with other related CLE peptides, with affinity varying based on amino acid sequence.
Conclusions:
- The findings provide direct biochemical evidence that CLV3 acts as a ligand for the CLV1 receptor.
- This ligand-receptor interaction is essential for the genetic pathway regulating stem cell maintenance in the shoot apical meristem.
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