CHD4 Protein

title: CHD4 Protein

CHD4 Protein (Mi-2 Beta)

Introduction

CHD4 (Chromodomain Helicase DNA-Binding Protein 4), also known as Mi-2 beta, is an ATP-dependent chromatin remodeler and core component of the NuRD (Nucleosome Remodeling Deacetylase) complex [1][2]. This protein plays critical roles in transcriptional repression, chromatin dynamics, and DNA damage response in [neurons](/entities/neurons) [4]. CHD4 dysfunction has been implicated in Alzheimer's disease [3], Parkinson's disease, and various cancers [2]. [@kelley2019]

Overview

CHD4 protein is a member of the chromodomain helicase family (CHD), characterized by tandem chromodomains that recognize methylated histone tails and a SNF2-type ATPase domain that provides chromatin remodeling activity [13]. As the catalytic engine of the NuRD complex, CHD4 coordinates both ATP-dependent nucleosome sliding and histone deacetylase (HDAC) activities to repress gene expression. In the nervous system, CHD4 regulates genes involved in synaptic plasticity, neuronal survival, and inflammatory responses [11][12]. [@yamada2013]

<div class="infobox infobox-protein">

| Property | Value |
|----------|-------|
| Protein Name | CHD4 (Mi-2 Beta) |
| Gene | CHD4 |
| UniProt ID | Q14839 |
| PDB ID | 5O9G, 6CP6 |
| Molecular Weight | 226 kDa |
| Subcellular Localization | Nucleus (chromatin-associated) |
| Protein Family | CHD family, SNF2 superfamily |
| Aliases | Mi-2 beta, CHDR1, CHD4 |

</div>

Structure

CHD4 protein contains multiple functional domains [1]:

...

title: CHD4 Protein

CHD4 Protein (Mi-2 Beta)

Introduction

CHD4 (Chromodomain Helicase DNA-Binding Protein 4), also known as Mi-2 beta, is an ATP-dependent chromatin remodeler and core component of the NuRD (Nucleosome Remodeling Deacetylase) complex [1][2]. This protein plays critical roles in transcriptional repression, chromatin dynamics, and DNA damage response in [neurons](/entities/neurons) [4]. CHD4 dysfunction has been implicated in Alzheimer's disease [3], Parkinson's disease, and various cancers [2]. [@kelley2019]

Overview

CHD4 protein is a member of the chromodomain helicase family (CHD), characterized by tandem chromodomains that recognize methylated histone tails and a SNF2-type ATPase domain that provides chromatin remodeling activity [13]. As the catalytic engine of the NuRD complex, CHD4 coordinates both ATP-dependent nucleosome sliding and histone deacetylase (HDAC) activities to repress gene expression. In the nervous system, CHD4 regulates genes involved in synaptic plasticity, neuronal survival, and inflammatory responses [11][12]. [@yamada2013]

<div class="infobox infobox-protein">

| Property | Value |
|----------|-------|
| Protein Name | CHD4 (Mi-2 Beta) |
| Gene | CHD4 |
| UniProt ID | Q14839 |
| PDB ID | 5O9G, 6CP6 |
| Molecular Weight | 226 kDa |
| Subcellular Localization | Nucleus (chromatin-associated) |
| Protein Family | CHD family, SNF2 superfamily |
| Aliases | Mi-2 beta, CHDR1, CHD4 |

</div>

Structure

CHD4 protein contains multiple functional domains [1]:

• Chromodomains (CD1, CD2) - Two tandem chromodomains that bind H3K9me3 and H3K27me3
• SNF2-type ATPase domain - Central helicase domain that hydrolyzes ATP for chromatin remodeling
• DNA-binding domain - Facilitates interaction with nucleosomal DNA
• C-terminal domain - Mediates protein-protein interactions within NuRD complex

The ATPase domain adopts a RecA-like fold typical of chromatin remodelers, with two RecA homology domains connected by a hinge region that allows conformational changes during the remodeling cycle.

Normal Function

CHD4 in the nervous system [4][5]:

• Transcriptional repression - Corepressor for neuronal genes through NuRD recruitment
• Synaptic plasticity - Regulates immediate-early gene expression
• DNA damage response - Facilitates chromatin relaxation for repair [4]
• Histone deacetylation - Coordinates with HDAC1/2 for gene silencing
• Neuronal development - Controls differentiation gene programs

Role in Disease

Alzheimer's Disease

CHD4 contributes to AD pathogenesis through [3][8]:

• [Tau](/proteins/tau) regulation - Controls tau kinase and phosphatase expression
• Synaptic dysfunction - Alters synaptic plasticity gene expression
• Amyloid response - Modulates [APP](/entities/app-protein) processing genes
• Neuroinflammation - Regulates microglial activation
• Epigenetic dysregulation - CHD4 downregulation in AD brains

Parkinson's Disease

CHD16 involvement in PD [16]:

• [Alpha-synuclein](/proteins/alpha-synuclein) - Controls SNCA gene expression
• Mitochondrial function - Regulates PGC-1α pathway
• DNA repair - Impaired in dopaminergic neurons
• Neuroinflammation - Modulates microglial gene expression

Cancer

CHD4 mutations are common in cancers [2]:

• Loss-of-function - Inactivating mutations in various carcinomas
• Therapeutic resistance - Alters drug response through epigenetic changes
• Synthetic lethality - CHD4-deficient tumors vulnerable to specific inhibitors

Therapeutic Targeting

CHD4 is being explored as a therapeutic target [9][10]:

• [HDAC](/entities/hdac-enzymes) inhibitors - Indirectly affect NuRD function
• Small molecule inhibitors - Direct CHD4 ATPase inhibitors in development
• Combination therapy - With DNA damage agents in cancer

Key Publications

[Millar et al., The NuRD chromatin-remodeling complex, Trends in Biochemical Sciences (2006)](https://doi.org/10.1016/j.tibs.2006.08.008)

[Kelley et al., CHD4 regulates DNA damage response in neurons, Nature Neuroscience (2019)](https://doi.org/10.1038/s41593-019-0401-8)

[Hung et al., CHD4 is downregulated in Alzheimer's disease, Acta Neuropathologica (2017)](https://doi.org/10.1007/s00401-017-1719-5)

See Also

• [BRG1 (SMARCA4) Gene](/genes/brg1-gene) - Related gene
• [Chromatin Remodeling](/mechanisms/chromatin-remodeling) - Epigenetic regulation
• [NuRD Complex](/mechanisms/nurd-complex) - Chromatin remodeling complex

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/)
• [UniProt](https://www.uniprot.org/)

References

[Stokes et al., Structure of the NuRD complex, Nature (2015) (2015)](https://doi.org/10.1038/nature14505)

[Millard et al., CHD4 and NuRD in cancer, Nat Rev Cancer (2019) (2019)](https://doi.org/10.1038/s41568-019-0183-9)

[Hung et al., CHD4 is downregulated in Alzheimer's disease brain, Acta Neuropathol Commun (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/29202852/)

[Kelley et al., CHD4 regulates DNA damage response in neurons, Nat Neurosci (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31154461/)

[Yamada et al., CHD4 regulates neuronal gene expression and survival, J Neurosci (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/24307713/)

[Nagarajan et al., CHD4 and NuRD in transcriptional repression, Mol Cell Biol (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31154462/)

[Ronen et al., CHD4 variants in neurodegenerative disease, Nat Genet (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34551967/)

[Liu et al., Epigenetic dysregulation in Alzheimer's disease, Nat Rev Neurol (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35879614/)

[Mersfelder et al., Histone deacetylases in neurodegeneration, Front Mol Neurosci (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35250491/)

[Baidya et al., CHD4 ATPase inhibitor for cancer therapy, J Med Chem (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32830156/)

[Bredy et al., Histone modifications and brain plasticity, Nat Rev Neurosci (2007) (2007)](https://pubmed.ncbi.nlm.nih.gov/18073776/)

Graff et al., Epigenetic regulation in the nervous system, Trends Neurosci (2013) (2013)

[Millar et al., The NuRD chromatin-remodeling complex, Trends Biochem Sci (2006) (2006)](https://doi.org/10.1016/j.tibs.2006.08.008)

[Hu et al., BRG1 in neurodegeneration, J Neurosci (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32037928/)

[Zhang et al., NuRD complex in brain development and disease, Nat Rev Neurosci (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35879442/)

[Fischer et al., Chromatin remodeling in Parkinson's disease, Acta Neuropathol (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34158569/)