ANKRD11 Protein

ANKRD11 Protein — Ankyrin Repeat Domain 11

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">ANKRD11 Protein</th></tr> [@sirmaci2011]
<tr><td><strong>Protein Name</strong></td><td>Ankyrin Repeat Domain 11</td></tr> [@chen2020]
<tr><td><strong>Gene</strong></td><td>[ANKRD11](/genes/ankrd11)</td></tr> [@liu2014]
<tr><td><strong>UniProt ID</strong></td><td>[Q9UMX0](https://www.uniprot.org/uniprot/Q9UMX0)</td></tr> [@zhang2015]
<tr><td><strong>Molecular Weight</strong></td><td>~256 kDa</td></tr> [@mcmahon2014]
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus</td></tr> [@wang2019]
<tr><td><strong>Protein Family</strong></td><td>Ankyrin repeat family</td></tr> [@tremblay2018]
</table> [@miyake2013]
</div> [@koch2017]

Overview

ANKRD11 Protein — Ankyrin Repeat Domain 11

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">ANKRD11 Protein</th></tr> [@sirmaci2011]
<tr><td><strong>Protein Name</strong></td><td>Ankyrin Repeat Domain 11</td></tr> [@chen2020]
<tr><td><strong>Gene</strong></td><td>[ANKRD11](/genes/ankrd11)</td></tr> [@liu2014]
<tr><td><strong>UniProt ID</strong></td><td>[Q9UMX0](https://www.uniprot.org/uniprot/Q9UMX0)</td></tr> [@zhang2015]
<tr><td><strong>Molecular Weight</strong></td><td>~256 kDa</td></tr> [@mcmahon2014]
<tr><td><strong>Subcellular Localization</strong></td><td>Nucleus</td></tr> [@wang2019]
<tr><td><strong>Protein Family</strong></td><td>Ankyrin repeat family</td></tr> [@tremblay2018]
</table> [@miyake2013]
</div> [@koch2017]

Overview

ANKRD11 (Ankyrin Repeat Domain 11) is a large transcriptional coactivator protein encoded by the ANKRD11 gene located on chromosome 16q24.3 [1]. The protein is characterized by multiple ankyrin repeat domains that mediate protein-protein interactions and function as a histone acetyltransferase (HAT) coactivator [2]. ANKRD11 plays essential roles in regulating gene expression during development, particularly in the nervous system, skeletal growth, and metabolic homeostasis. Heterozygous loss-of-function mutations in ANKRD11 cause KBG syndrome, a neurodevelopmental disorder characterized by intellectual disability, macrodontia, and distinctive facial features [3]. Beyond its role in neurodevelopment, ANKRD11 functions as a tumor suppressor and is implicated in neurodegenerative diseases including Alzheimer's disease and Huntington's disease [4].

Structure

ANKRD11 is a large protein with a complex domain architecture:

Domain Organization

• Ankyrin Repeat Domains: Six ankyrin repeats in the central region (ANK1-ANK6)
• N-terminal Region: Contains transcriptional activation domain
• C-terminal Region: Additional regulatory sequences

Structural Features

• Ankyrin Repeat Fold: Consists of tandem repeats of ~33 amino acids forming a螺旋-转角-螺旋 motif
• HAT Domain: Histone acetyltransferase activity in N-terminal region
• Nuclear Localization Signals: Two NLS sequences for nuclear import
• Molecular Weight: ~256 kDa (one of the largest ankyrin repeat proteins)

Post-translational Modifications

• Phosphorylation: Multiple serine/threonine phosphorylation sites
• Acetylation: Lysine acetylation regulates protein function
• Ubiquitination: Controls protein stability and turnover
• Sumoylation: Modulates transcriptional activity

Normal Function

Transcriptional Regulation

ANKRD11 is a potent transcriptional coactivator [5]:

Histone Acetyltransferase Activity:

• Acetylates histone H3 and H4
• Opens chromatin structure
• Enhances transcription factor binding

• Interacts with p300/CBP histone acetyltransferases
• Binds transcription factors (p53, [NF-κB](/entities/nf-kb), estrogen receptor)
• Recruits chromatin remodeling complexes

• Cell cycle regulators (p21, cyclin D1)
• Metabolic genes
• Developmental transcription factors

Neurodevelopment

ANKRD11 is critical for proper brain development [6]:

Neuronal Differentiation:

• Promotes neuronal lineage commitment
• Regulates neurite outgrowth
• Supports synaptic formation

• Controls synaptic protein expression
• Modulates dendritic spine morphology
• Essential for learning and memory

Growth Regulation

The protein influences systemic growth:

Skeletal Growth:

• Regulates chondrocyte proliferation
• Controls bone development
• Influences growth plate function

• Modulates insulin signaling
• Regulates lipid metabolism
• Controls energy expenditure

Role in Disease

KBG Syndrome

Heterozygous ANKRD11 mutations cause KBG syndrome [7]:

Clinical Features:

• Intellectual disability (mild to moderate)
• Macrodontia (large upper incisors)
• Distinctive facial features (triangular face, hypertelorism)
• Short stature
• Hand anomalies (brachydactyly)
• Seizures (in some patients)
• Autism spectrum disorder

• Truncating mutations (nonsense, frameshift)
• Missense mutations affecting ankyrin repeats
• Dominant-negative effects

• Haploinsufficiency reduces ANKRD11 function
• Impaired transcriptional activation
• Disrupted neuronal development

Alzheimer's Disease

ANKRD11 is implicated in AD pathogenesis [8]:

Transcriptional Dysregulation:

• Reduced ANKRD11 expression in AD brain
• Impaired p53 function
• Altered cell cycle regulation

• ANKRD11 downregulation by [Aβ](/proteins/amyloid-beta)
• Enhanced neuronal vulnerability
• Synaptic dysfunction

• ANKRD11 upregulation may protect [neurons](/entities/neurons)
• Targeting HAT activity
• Restoring transcriptional balance

Huntington's Disease

ANKRD11 dysfunction contributes to HD [9]:

Transcriptional Alterations:

• Mutant [huntingtin](/proteins/huntingtin) disrupts ANKRD11 function
• Altered gene expression patterns
• Impaired neuronal survival

• Reduced neurotrophic support
• Enhanced excitotoxicity
• Mitochondrial dysfunction

Cancer

ANKRD11 functions as a tumor suppressor [10]:

Genetic Alterations:

• Somatic mutations in various cancers
• Deletion in 16q24.3 region
• Epigenetic silencing

• Cell cycle arrest
• [Apoptosis](/entities/apoptosis) induction
• Inhibition of proliferation

• ANKRD11 restoration approaches
• HAT domain as drug target
• Synthetic lethality strategies

Autism Spectrum Disorder

ANKRD11 mutations contribute to ASD [11]:

Neurodevelopmental Mechanisms:

• Impaired synaptic function
• Altered social behavior
• Repetitive phenotypes

• Dysregulated gene expression
• Chromatin remodeling defects
• Synaptic protein dysregulation

Interacting Partners

| Protein | Interaction Type | Functional Significance |
|---------|------------------|------------------------|
| p300/CBP | Coactivator | Histone acetylation, transcription |
| p53 | Transcription factor | Cell cycle arrest, apoptosis |
| NF-κB | Transcription factor | Inflammation, survival |
| Histone H3/H4 | Substrate | Chromatin modification |
| [HDAC](/entities/hdac-enzymes) | Regulator | Transcriptional repression |

Therapeutic Approaches

Targeting ANKRD11 for disease treatment:

Biomarkers

ANKRD11 as a potential biomarker:

• Expression Levels: Reduced in AD/HD brain
• Mutations: Diagnostic for KBG syndrome
• Therapeutic Response: Marker of treatment efficacy

See Also

• [ANKRD11 Gene](/genes/ankrd11)
• [Transcriptional Regulation](/mechanisms/transcriptional-regulation)
• [KBG Syndrome](/diseases/kbg-syndrome)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Chromatin Remodeling in Neurodegeneration](/mechanisms/chromatin-remodeling)

External Links

• [UniProt Q9UMX0](https://www.uniprot.org/uniprot/Q9UMX0)
• [GeneCards ANKRD11](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ANKRD11)
• [OMIM: KBG Syndrome](https://www.omim.org/entry/148050)
• [NCBI Gene ANKRD11](https://www.ncbi.nlm.nih.gov/gene/29127)

References