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Updated: Feb 21, 2026
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
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Building kit for metal cation binding sites in proteins
Alexander I Denesyuk1, Sergei E Permyakov2, Mark S Johnson3
1Faculty of Science and Engineering, Åbo Akademi University, Turku 20500, Finland; Institute for Biological Instrumentation of the Russian Academy of Sciences, Pushchino 142290, Russia.
Biochemical and Biophysical Research Communications
|October 12, 2017
Summary
Researchers identified four novel calcium-binding units (ORI, TRI, ORII, TRII) in proteins. These units act as building blocks for diverse calcium-binding sites, revealing conserved recognition patterns across various proteins.
Area of Science:
- Biochemistry
- Structural Biology
- Protein Science
Background:
- Calcium ions (Ca2+) are crucial for numerous biological processes.
- Understanding calcium-binding sites is essential for deciphering protein function.
- Existing models of calcium recognition in proteins like parvalbumin and integrin provide a foundation.
Purpose of the Study:
- To introduce and characterize novel local calcium-recognition units in proteins.
- To analyze the diversity and occurrence of these units in known protein structures.
- To propose a framework for understanding the construction of complex calcium-binding sites.
Main Methods:
- Analysis of calcium-binding site conformations in representative proteins (parvalbumin, integrin).
- Introduction of four new local Ca2+-recognition units: ORI, TRI, ORII, and TRII.
- Examination of existing protein databases for the presence and combinations of these units.
Main Results:
- Four new calcium-recognition units (ORI, TRI, ORII, TRII) were defined based on residue number and atom types.
- Theoretical variants for type I (4) and type II (12) units were established.
- Analysis confirmed the presence of most theoretical variants in known 'Ca2+-bound functional niches'.
- Consecutive combinations of these units, forming tripeptide structures, were identified in proteins like parvalbumin and integrin alpha-IIb.
Conclusions:
- The identified ORI, TRI, ORII, and TRII units serve as fundamental building blocks for calcium recognition.
- These units can be combined to form more complex calcium-binding substructures.
- The findings provide a new perspective on the diversity and construction principles of calcium-binding sites across unrelated proteins.
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