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Identification of Post-translational Modifications of Plant Protein Complexes
Published on: February 22, 2014
Structural bases for recognition of Anp32/LANP proteins
Cesira de Chiara1, Rajesh P Menon, Annalisa Pastore
1National Institute for Medical Research, The Ridgeway, London, UK.
The FEBS Journal
|April 16, 2008
Summary
The leucine-rich repeat acidic nuclear protein (Anp32a/LANP) interacts weakly with ataxin-1, suggesting modifications are needed for binding. A new partner, Clip 170/Restin, was identified, impacting microtubule dynamics.
Area of Science:
- Molecular and Cellular Biology
- Protein Interactions
- Structural Biology
Background:
- Anp32a/LANP is a phosphoprotein involved in complex protein interactions.
- Understanding Anp32a/LANP's cellular role requires investigating its interaction modes.
Purpose of the Study:
- To investigate the interaction mechanisms of Anp32a/LANP with its protein partners.
- To determine the binding affinity between the Anp32a LRR domain and the ataxin-1 AXH domain.
- To identify novel Anp32a/LANP interacting proteins.
Main Methods:
- Solution structure determination of the Anp32a N-terminal LRR domain.
- Modeling of Anp32a LRR domain interactions with other proteins.
- Experimental probing of Anp32a LRR and ataxin-1 AXH domain interactions.
- Yeast two-hybrid screening to identify new Anp32a LRR binding partners.
Main Results:
- The Anp32a LRR domain structure was solved.
- Anp32a LRR and ataxin-1 AXH domains exhibit weak millimolar affinity binding.
- A new Anp32a LRR binding partner, Clip 170/Restin, was identified.
- Clip 170/Restin is a microtubule-associated protein involved in regulating microtubule dynamics.
Conclusions:
- Weak binding between isolated Anp32a LRR and ataxin-1 AXH domains suggests the need for additional partners or post-translational modifications for stable interaction.
- The identification of Clip 170/Restin as a novel Anp32a LRR binding partner provides new insights into Anp32a's cellular functions, particularly in microtubule regulation.
- Anp32a's interaction with Clip 170/Restin may have implications for understanding human pathologies associated with microtubule dysfunction.
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