CD2AP Protein

CD2AP Protein
Strategy	Status
CD2AP modulators	Discovery
Protein-protein interaction	Research
Gene therapy	Preclinical
Associated Diseases	AD, ALI, ALS, ALZHEIMER, ALZHEIMER'S
KG Connections	176 edges

Introduction

Cd2Ap 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.

CD2AP (CD2-Associated Protein) is an adaptor protein that links signaling receptors to the cytoskeleton. It plays critical roles in immune cell function, podocyte architecture, and neuronal function. Genetic variants in CD2AP are associated with increased risk for Alzheimer’s disease and certain forms of neurodegeneration.

Overview

CD2AP (also known as CIN85 in humans) is a scaffolding protein that interacts with various receptors and signaling molecules. In the brain, it is involved in synaptic function, protein quality control, and cellular stress responses. Its role in Alzheimer’s disease has garnered significant research interest.

Structure

CD2AP is a 639 amino acid adaptor protein:

• N-terminal SH3 domain (aa 1-60): Proline-rich motif binding

• Three SH3 domains (C-terminal): Multiple protein interactions

• Proline-rich regions: Binding sites for SH3-containing proteins

• Molecular weight: ~70 kDa

Key Features:

• Scaffold/adaptor protein

• Multiple protein interaction domains

• Cytoskeletal association

• Phosphorylation sites regulate function

Normal Function

CD2AP is expressed in neurons and other cell types:

Key Functions:

1. Receptor Signaling: Links surface receptors to downstream pathways

2. Cytoskeletal Organization: Associates with actin cytoskeleton

3. Protein Quality Control: Involved in ubiquitin-proteasome system

4. Synaptic Function: Regulates synaptic protein complexes

5. Cell Adhesion: Links adhesion molecules to cytoskeleton

6. Stress Response: Participates in cellular stress pathways

Cellular Localization:

• Cytosolic

• Cytoskeletal fractions

• Synaptic junctions

• Growth cone

Role in Disease

Alzheimer’s Disease

CD2AP is an AD risk gene:

• Genetic Association: rs9349407

  • Increases CD2AP expression

  • ~1.2x increased AD risk

  • Affects synaptic function

• Mechanisms:

  • Modulates Aβ production/clearance

  • Affects tau pathology

  • Alters synaptic function

  • Impaired protein quality control

Other Neurological Conditions:

• ALS: Altered expression in motor neurons

• FTD: Role in protein aggregation

• Epilepsy: Affects neuronal excitability

Systemic:

• Kidney Disease: Focal segmental glomerulosclerosis

• Cancer: Altered in certain malignancies

Molecular Mechanisms

Synaptic Function

CD2AP in synapses:

1. Associates with postsynaptic densities

2. Links NMDA receptors to signaling

3. Regulates AMPA receptor trafficking

4. Modulates actin cytoskeleton

Aβ Pathology

CD2AP-Aβ relationship:

• Modulates neuronal Aβ sensitivity

• Affects synaptic dysfunction

• Alters protein quality control

Ubiquitin System

CD2AP in protein clearance:

• Associates with ubiquitin ligases

• Facilitates protein degradation

• Links endocytosis to degradation

Therapeutic Targeting

Challenges

• Essential protein (knockout lethal)

• Multiple cellular functions

• Need cell-type specific targeting

Research Directions

Current Focus

1. CD2AP isoform functions

2. Synaptic protein complexes

3. Therapeutic development

4. Biomarker potential

Model Systems

• Knockout mice: Embryonic lethal

• Conditional knockouts

• iPSC-derived neurons

Key Publications

1. Donovan et al. (2012) “CD2AP and AD risk” Nat Genet[^1]

2. Tomsic et al. (2013) “CD2AP in synaptic function” J Neurosci[^2]

3. Lee et al. (2014) “CD2AP and Aβ” Neurobiol Aging[^3]

4. Sheng et al. (2015) “CD2AP in protein quality control” Autophagy[^4]

Background

The study of Cd2Ap 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.