title: Calbindin - Calbindin D-28k category: protein
Calbindin D-28k
Introduction
Calbindin Calbindin D 28K is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@german1992]
title: Calbindin - Calbindin D-28k category: protein
Calbindin D-28k
Introduction
Calbindin Calbindin D 28K is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes. [@german1992]
Calbindin D-28k (encoded by the [CALB1](/genes/calb1) gene) is a calcium-binding protein of the EF-hand family with a molecular weight of approximately 30 kDa. It is widely expressed in [neurons](/cell-types/neurons) throughout the central nervous system, particularly in [Purkinje cells](/cell-types/purkinje-cells) of the [cerebellum](/brain-regions/cerebellum), [hippocampal](/brain-regions/hippocampus) pyramidal [neurons](/entities/neurons), and various [cortical](/anatomy/cerebral-cortex) neuronal populations.
Calbindin serves as a high-affinity calcium buffer, protecting neurons from calcium overload and excitotoxicity. It is one of the most studied calcium-binding proteins in the context of [neurodegeneration](/diseases/neurodegeneration).
Structure
Calbindin D-28k possesses:
6 EF-hand calcium-binding motifs
High-affinity calcium binding (Kd ~10^-7 M)
Characteristic EF-hand protein fold
Dimerization capability
Structure solved by X-ray crystallography (PDB: 1IG5)
Normal Function
Calcium Buffering
Calbindin functions as a neuroprotective calcium buffer:
Gene Therapy: Viral delivery of CALB1 to protect neurons
Small Molecule Mimetics: Developing calbindin-mimetic compounds
Cell-Based Therapy: Transplantation of calbindin-expressing cells
Biomarker: Calbindin as a marker for neuronal health
Research Methods
Calbindin is widely used as a neuronal marker:
Immunohistochemistry: Primary marker for specific neuron populations
Transgenic Reporter Lines: For studying neuronal development
Electrophysiology: Studying calcium dynamics in calbindin+ neurons
Single-cell RNA-seq: Marker for neuronal classification
Interactions and Pathways
Calbindin interacts with:
Calcium-dependent signaling proteins
Mitochondrial calcium uniporter (MCU)
Calmodulin-dependent kinases
Transcription factors
Background
The study of Calbindin Calbindin D 28K 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.