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07:51
Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
Structure, binding interface and hydrophobic transitions of Ca2+-loaded calbindin-D(28K)
Douglas J Kojetin1, Ronald A Venters, David R Kordys
1Department of Molecular and Structural Biochemistry, North Carolina State University, Raleigh, North Carolina 27695, USA.
Nature Structural & Molecular Biology
|June 27, 2006
Summary
Calbindin-D(28K), a calcium-binding protein, has its Ca2+-bound structure revealed by NMR. This provides key insights into its function as a calcium buffer and sensor, detailing its binding sites and hydrophobic properties.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biophysics
Background:
- Calbindin-D(28K) is a vital calcium-binding protein involved in calcium buffering and sensing.
- Understanding its structure is crucial for elucidating its biological functions.
Purpose of the Study:
- To determine the high-resolution NMR solution structure of Ca2+-loaded calbindin-D(28K).
- To characterize the protein's binding interfaces and hydrophobic properties upon calcium binding.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy was employed to solve the solution structure.
- Fluorescence experiments were conducted to investigate hydrophobic state changes.
Main Results:
- The NMR structure reveals a globular fold with six EF-hand subdomains coordinating Ca2+.
- Interaction surfaces involving alpha-helices and loops were identified for target peptides, including procaspase-3.
- Calbindin-D(28K) exhibits discrete hydrophobic states upon Ca2+ binding.
Conclusions:
- The determined structure offers detailed insights into the functional mechanisms of calbindin-D(28K).
- This study presents one of the largest high-resolution NMR structures and the largest monomeric EF-hand protein solved to date.
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