S100A1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
S100A1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
S100A1 (S100 Calcium-Binding Protein A1) is a member of the S100 family of small calcium-binding proteins. Encoded by the [S100A1 gene](/genes/s100a1), this protein functions as a calcium sensor that regulates various cellular processes through protein-protein interactions [1][2].
S100A1 is characterized by its ability to form homodimers and heterodimers with other S100 proteins. The protein is expressed abundantly in the heart, skeletal muscle, and brain, where it plays important roles in calcium signaling, muscle physiology, and neuroprotection [3].
Structure
Primary Structure
S100A1 is a small protein of 94 amino acids with:
Two EF-hand calcium-binding motifs
Central hinge region
C-terminal extension
Dimeric Structure
Forms antiparallel homodimers
Each monomer ~10.7 kDa
Dimerization creates functional binding surfaces
Calcium Binding
C-terminal EF-hand
High affinity (Kd ~10⁻⁶ M)
Classical EF-hand motif
N-terminal EF-hand
Lower affinity (Kd ~10⁻⁵ M)
S100-specific sequence
Normal Function
Calcium-Dependent Signaling
Upon calcium binding, S100A1 undergoes conformational changes exposing hydrophobic patches that interact with target proteins.
May interact with [alpha-synuclein](/proteins/alpha-synuclein)
Antioxidant properties
Cardiovascular Disease
S100A1 is well-studied in heart:
Cardiomyopathy
Heart failure
Ischemic injury
Therapeutic Implications
Target Potential
S100A1-based therapies are being explored:
Cardiac applications
Neuroprotective strategies
Biomarker Use
S100A1 has been investigated as:
Cardiac damage marker
CNS injury biomarker
Key Publications
[Donato et al., S100 proteins (2009)](https://doi.org/10.1016/j.neuropharm.2009.04.012)
[Marenholz et al., S100 family (2004)](https://doi.org/10.1016/j.tics.2004.09.004)
[Van Eldik et al., S100 in brain (2003)](https://doi.org/10.1016/S0301-0082(03)00090-9)
Background
The study of S100A1 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.