PDK3 - 3-Phosphoinositide-Dependent Protein Kinase-3

Introduction

flowchart TD
    PDK3["PDK3"] -->|"activates"| Colorectal_Cancer["Colorectal Cancer"]
    PDK3["PDK3"] -->|"activates"| Cancer["Cancer"]
    PDK3["PDK3"] -->|"activates"| Tumor["Tumor"]
    PDK3["PDK3"] -->|"activates"| Als["Als"]
    PDK3["PDK3"] -->|"activates"| HK2["HK2"]
    PDK3["PDK3"] -->|"activates"| PDK1["PDK1"]
    PDK3["PDK3"] -->|"activates"| MYC["MYC"]
    PDK3["PDK3"] -->|"activates"| Mitosis["Mitosis"]
    PDK3["PDK3"] -->|"activates"| GENES["GENES"]
    PDK3["PDK3"] -->|"activates"| Glycolysis["Glycolysis"]
    E2F1["E2F1"] -->|"activates"| PDK3["PDK3"]
    ENO1["ENO1"] -->|"activates"| PDK3["PDK3"]
    MYC["MYC"] -->|"activates"| PDK3["PDK3"]
    RB1["RB1"] -->|"associated with"| PDK3["PDK3"]
    style PDK3 fill:#4fc3f7,stroke:#333,color:#000

The PDK3 gene (3-Phosphoinositide-Dependent Protein Kinase 3) encodes a member of the phosphoinositide-dependent protein kinase (PDK) family. PDK3 is a serine/threonine kinase that plays important roles in cell survival, metabolism, and stress responses

Gene Information

Protein Structure

PDK3 contains characteristic features:

• Kinase Domain: Serine/threonine kinase activity

• PH Domain: Phosphoinositide binding (present in some isoforms)

• Regulatory Regions: Autoinhibitory and activation segments

Normal Cellular Function

Cell Survival Signaling

• Akt Activation: PDK3 phosphorylates and activates Akt/PKB

• PKC Activation: Regulates protein kinase C isoforms

• Cell Survival: Promotes cell survival under stress conditions

Metabolic Regulation

• Glucose Metabolism: Insulin signaling pathway component

• Lipid Metabolism: Affects lipid synthesis and storage

• Mitochondrial Function: Regulates mitochondrial activity

Stress Responses

• Oxidative Stress: Activated in response to ROS

• DNA Damage: Involved in DNA damage responses

• Hypoxia: Regulates hypoxic responses

Expression Pattern

PDK3 is widely expressed:

• Brain: Neurons in cortex, hippocampus, cerebellum

• Heart, skeletal muscle

• Liver, kidney

• Pancreas

Expression is regulated by developmental stage and metabolic conditions.

Disease Associations

Alzheimer’s Disease

• Tau Phosphorylation: May contribute to tau pathology

• Cell Survival: Dysregulation affects neuronal viability

• Metabolic Dysfunction: Links to brain metabolic deficits

Parkinson’s Disease

• Dopaminergic Neurons: Altered expression in substantia nigra

• Mitochondrial Function: Regulates mitochondrial health

Cancer

• Oncogenic Role: Overexpressed in various cancers

• Cell Proliferation: Promotes cancer cell growth

• Therapeutic Target: PDK3 inhibitors in development

Metabolic Disorders

• Diabetes: Altered insulin signaling

• Obesity: Metabolic dysfunction

Signaling Pathways

PDK3 participates in multiple pathways:

• PI3K/Akt Pathway: Central cell survival pathway

• mTOR Pathway: Growth and metabolism regulation

• AMPK Pathway: Energy sensing

• MAPK Pathway: Stress responses

Therapeutic Targeting

Research Highlights

• PDK3 knockout mice show developmental abnormalities

• PDK3 promotes neuronal survival under stress conditions

• Targeting PDK3 shows therapeutic potential in models

See Also

• PDK1 Gene

• AKT Signaling Pathway

• PI3K/Akt Pathway

• Alzheimer’s Disease

• Parkinson’s Disease

• Cell Survival Pathways

External Links

• NCBI Gene: PDK3

• UniProt: O95819

• GeneCards: PDK3