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A model for target protein binding to calcium-activated S100 dimers
P Groves1, B E Finn, J Kuźnicki
1Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology, Warsaw, Poland. patrick@ameba.nencki.gov.pl
FEBS Letters
|February 19, 1998
Summary
S100 proteins, implicated in diseases, include unusual monomeric Calbindin D9k. This study characterizes a novel calcium-induced helix in Calbindin D9k, potentially aiding S100 protein target binding.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biology
Background:
- S100 proteins are dimeric calcium-binding proteins linked to cancer and neurological disorders.
- Calbindin D9k represents a unique monomeric member within the S100 protein family.
Purpose of the Study:
- To characterize a novel calcium-induced helix in a Calbindin D9k mutant.
- To investigate the structural basis of S100 protein function and target interactions.
Main Methods:
- Protein mutagenesis to create a Calbindin D9k mutant.
- Structural analysis and sequence comparison.
- Bioinformatic analysis of S100 protein structures.
Main Results:
- A novel calcium-induced helix was identified in the Calbindin D9k mutant.
- Sequence comparison suggests this helix may be conserved in other S100 proteins.
- Structural discrepancies in apo S100 dimer models were attributed to modeling artifacts, not functional differences.
Conclusions:
- The novel helix in Calbindin D9k may play a role in S100 protein target binding.
- S100 protein structural variations are likely modeling artifacts.
- A potential mechanism for S100 protein-target interaction is proposed.