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Updated: Jul 29, 2026

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Published on: March 9, 2010
Annexins I, II and III are specific choline binding proteins
U J Zimmerman1, B B Hennigan, L Liu
1Institute for Environmental Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.
Researchers identified specific choline binding activities in annexins, proteins previously not known to bind choline. This discovery reveals new functions for annexins in cellular processes.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Choline binding proteins are crucial for various cellular functions.
- Annexins are a family of calcium-dependent phospholipid-binding proteins.
Purpose of the Study:
- To isolate and characterize choline binding proteins from human lung epithelial cells (A549).
- To determine if annexins possess choline binding activity.
Main Methods:
- Detergent solubilization, anion exchange, and affinity chromatography were used for protein isolation.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and N-terminal microsequencing identified proteins.
- Choline-conjugated Sepharose 6B affinity chromatography was employed to assess binding.
Main Results:
- A 38 kDa protein with specific choline binding activity was purified and identified as annexin II.
- Annexin II was not previously known to bind choline.
- Annexins I, II, and III demonstrated binding to a choline column, while annexins IV and V did not.
Conclusions:
- The study indicates that certain annexins possess specific choline binding activities.
- This finding expands the known functional repertoire of the annexin protein family.
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