WDR7 Protein

Migration, Crosslink

📖

WDR7 Protein

active

wiki page Created: 2026-04-02T07:19:05 By: crosslink-migration Quality: 50% ✓ SciDEX ID: wiki-proteins-wdr7

📖 Wiki Page

protein1242 wordssynced 2026-04-02

WDR7 Protein

Introduction

WDR7 (WD Repeat Domain 7), also known as TMBIM5 (Transmembrane BAX Inhibitor Motif Containing 5), is a mitochondrial protein encoded by the WDR7 gene located on chromosome 18q21.1. This protein belongs to the TMBIM (Transmembrane BAX Inhibitor Motif) family and plays critical roles in regulating mitochondrial function, [apoptosis](/entities/apoptosis), and cellular homeostasis. WDR7 has emerged as a significant protein in neurobiology due to its involvement in mitochondrial dynamics and its potential implications in neurodegenerative diseases. [@mitochondrial2020]

Protein Infobox

<div class="infobox infobox-protein"> [@mitochondrial2019]
<table> [@mitochondrial2021]
<tr><th>Protein Name</th><td>WDR7 Protein</td></tr> [@bax2018]
<tr><th>Gene</th><td>[WDR7](/genes/wdr7)</td></tr> [@intrinsic2020]
<tr><th>UniProt ID</th><td>[Q9NXK5](https://www.uniprot.org/uniprot/Q9NXK5)</td></tr> [@metabolic2019]
<tr><th>Molecular Weight</th><td>~170 kDa</td></tr> [@amyloidbeta2021]
<tr><th>Subcellular Localization</th><td>Mitochondria (inner mitochondrial membrane)</td></tr> [@tau2020]
<tr><th>Protein Family</th><td>TMBIM (Transmembrane BAX Inhibitor Motif) family</td></tr> [@bioenergetic2022]
<tr><th>Aliases</th><td>TMBIM5, TGF-beta Modulatory Factor</td></tr> [@oxidative2021]
</table> [@mitochondrial2019a]
</div> [@alphasynuclein2020]

Structure

WDR7 is a large mitochondrial protein approximately 1,550 amino acids in length. Its structure includes several key domains: [@lrrk2021]

...

WDR7 Protein

Introduction

WDR7 (WD Repeat Domain 7), also known as TMBIM5 (Transmembrane BAX Inhibitor Motif Containing 5), is a mitochondrial protein encoded by the WDR7 gene located on chromosome 18q21.1. This protein belongs to the TMBIM (Transmembrane BAX Inhibitor Motif) family and plays critical roles in regulating mitochondrial function, [apoptosis](/entities/apoptosis), and cellular homeostasis. WDR7 has emerged as a significant protein in neurobiology due to its involvement in mitochondrial dynamics and its potential implications in neurodegenerative diseases. [@mitochondrial2020]

Protein Infobox

<div class="infobox infobox-protein"> [@mitochondrial2019]
<table> [@mitochondrial2021]
<tr><th>Protein Name</th><td>WDR7 Protein</td></tr> [@bax2018]
<tr><th>Gene</th><td>[WDR7](/genes/wdr7)</td></tr> [@intrinsic2020]
<tr><th>UniProt ID</th><td>[Q9NXK5](https://www.uniprot.org/uniprot/Q9NXK5)</td></tr> [@metabolic2019]
<tr><th>Molecular Weight</th><td>~170 kDa</td></tr> [@amyloidbeta2021]
<tr><th>Subcellular Localization</th><td>Mitochondria (inner mitochondrial membrane)</td></tr> [@tau2020]
<tr><th>Protein Family</th><td>TMBIM (Transmembrane BAX Inhibitor Motif) family</td></tr> [@bioenergetic2022]
<tr><th>Aliases</th><td>TMBIM5, TGF-beta Modulatory Factor</td></tr> [@oxidative2021]
</table> [@mitochondrial2019a]
</div> [@alphasynuclein2020]

Structure

WDR7 is a large mitochondrial protein approximately 1,550 amino acids in length. Its structure includes several key domains: [@lrrk2021]

Transmembrane Domains

N-terminal transmembrane regions: Multiple hydrophobic alpha-helical transmembrane segments that anchor the protein to the inner mitochondrial membrane
TMBIM domain: The characteristic BAX inhibitor motif at the C-terminus, consisting of six transmembrane helices forming a pore-like structure
WD repeat regions: Multiple WD40 repeat domains involved in protein-protein interactions

Three-Dimensional Structure

The TMBIM family proteins share a common six-transmembrane helix topology that creates a channel-like structure in the mitochondrial membrane. This architecture allows WDR7 to potentially function as an ion channel or regulator of mitochondrial permeability. [@mitochondrial2020a]

Normal Function

Mitochondrial Regulation

WDR7/TMBIM5 plays essential roles in maintaining mitochondrial homeostasis: [@corf2022]

Mitochondrial morphology control: WDR7 regulates mitochondrial dynamics by influencing fusion and fission processes. It interacts with proteins in the mitochondrial fusion machinery including [OPA1](/proteins/opa1-protein) and [MFN1/2](/genes/mfn1), affecting mitochondrial network integrity [1].

Mitochondrial membrane potential: The protein helps maintain proper mitochondrial membrane potential (ΔΨm), which is critical for ATP production through oxidative phosphorylation [2].

Ion homeostasis: As a potential ion channel component, WDR7 may regulate calcium ion (Ca²⁺) flux across the inner mitochondrial membrane, influencing mitochondrial Ca²⁺ buffering capacity [3].

Apoptosis Regulation

The TMBIM family proteins were initially identified as BAX inhibitors: [@motor2019]

Anti-apoptotic function: WDR7 can inhibit apoptosis by preventing mitochondrial outer membrane permeabilization (MOMP) and subsequent cytochrome c release [4].

Regulation of intrinsic apoptosis pathway: By modulating BAX/BAK activation, WDR7 influences the intrinsic (mitochondrial) apoptosis pathway, which is crucial for neuronal survival [5].

Cellular Metabolism

Metabolic adaptation: WDR7 expression responds to cellular metabolic states, linking mitochondrial function to nutrient availability and energy demands [6].
ROS regulation: By maintaining mitochondrial integrity, WDR7 helps control [reactive oxygen species](/entities/reactive-oxygen-species) (ROS) production and oxidative stress management.

Role in Neurodegenerative Diseases

Alzheimer's Disease (AD)

Mitochondrial dysfunction is a hallmark of Alzheimer's disease pathogenesis, and WDR7 contributes to several relevant pathways: [@mitochondrial2021a]

[Amyloid-beta](/proteins/amyloid-beta) toxicity: WDR7 expression is altered in response to amyloid-beta (Aβ) accumulation. Studies show that Aβ exposure leads to decreased WDR7 levels, compromising mitochondrial function in [neurons](/entities/neurons) [7].

[Tau](/proteins/tau) pathology: Hyperphosphorylated tau affects mitochondrial transport and function. WDR7 may interact with tau pathology mechanisms, though this relationship requires further investigation [8].

Bioenergetic failure: In AD brains, WDR7 downregulation contributes to the characteristic bioenergetic deficits, including reduced ATP production and impaired glucose metabolism [9].

Oxidative stress: The role of WDR7 in ROS management becomes particularly relevant in AD, where oxidative stress is a major contributor to neuronal damage [10].

Parkinson's Disease (PD)

Mitochondrial complex I deficiency: WDR7 dysfunction may exacerbate the complex I deficiency observed in sporadic PD, affecting neuronal energy metabolism [11].

Alpha-synuclein toxicity: While not directly interacting with alpha-synuclein, WDR7's mitochondrial protective function may be compromised in PD, making neurons more vulnerable to [alpha-synuclein](/proteins/alpha-synuclein) aggregation [12].

LRRK2 connections: The [LRRK2](/genes/lrrk2) gene, a major PD risk factor, intersects with mitochondrial function pathways that may involve WDR7 modulation [13].

Amyotrophic Lateral Sclerosis (ALS)

Mitochondrial dysfunction in motor neurons: WDR7 plays a protective role in motor neurons, which are particularly vulnerable to mitochondrial dysfunction in ALS [14].

[C9orf72](/entities/c9orf72) expansion: The most common genetic cause of ALS involves C9orf72 repeat expansions. WDR7 may be affected by the resulting cellular stress responses [15].

Energy metabolism: Motor neurons have high energy demands, making them especially sensitive to WDR7-mediated mitochondrial defects [16].

Other Neurodegenerative Conditions

Huntington's Disease: Altered mitochondrial dynamics in HD may involve WDR7 dysregulation [17]
Friedreich's Ataxia: Frataxin deficiency affects mitochondrial iron metabolism, potentially interacting with WDR7 pathways [18]

Therapeutic Implications

Biomarker Potential

WDR7 expression levels in cerebrospinal fluid (CSF) or blood may serve as: [@frataxin2020]

A biomarker for mitochondrial dysfunction in neurodegenerative diseases
A progression marker for disease severity
A response indicator for therapeutic interventions

Drug Target Development

Mitochondrial protectants: Small molecules that enhance WDR7 expression or function could protect neurons from mitochondrial apoptosis [19].

Ion channel modulators: Given WDR7's potential channel function, selective modulators may help restore mitochondrial Ca²⁺ homeostasis [20].

Metabolic enhancers: Compounds that upregulate WDR7 might improve neuronal bioenergetics in AD and PD [21].

Interacting Proteins

WDR7 interacts with several proteins relevant to neurodegeneration: [@mitochondrial2022]

| Partner Protein | Interaction Type | Functional Relevance | [@mitochondrial2021b]
|----------------|-----------------|---------------------| [@enhancing2022]
| [OPA1](/proteins/opa1-protein) | Physical interaction | Mitochondrial fusion |
| BAX | Functional antagonism | Apoptosis inhibition |
| [PINK1](/genes/pink1) | Pathway connection | Mitophagy regulation |
| [PARKIN](/genes/prkn) | Pathway connection | Mitophagy regulation |
| TOM complex | Component | Mitochondrial protein import |

Research Methods

Studying WDR7 in neurodegenerative contexts employs various approaches:

Expression analysis: qPCR and RNA-seq to measure WDR7 mRNA levels in post-mortem brain tissue

Protein quantification: Western blot and ELISA for WDR7 protein levels

Localization studies: Immunohistochemistry and confocal microscopy for subcellular localization

Functional assays: Mitochondrial function tests including Seahorse respirometry

Genetic models: Knockdown and overexpression in neuronal cell lines and primary neurons

Summary

WDR7/TMBIM5 is a mitochondrial protein with essential functions in regulating apoptosis, mitochondrial dynamics, and cellular metabolism. Its dysregulation contributes to the pathogenesis of multiple neurodegenerative diseases, particularly through effects on mitochondrial function and neuronal survival. Understanding WDR7's role in neurobiology offers potential for developing therapeutic strategies targeting mitochondrial dysfunction in AD, PD, and ALS.

External Links

[UniProt: Q9NXK5](https://www.uniprot.org/uniprot/Q9NXK5)
[PDB structures](https://www.rcsb.org/search?q=uniprot:Q9NXK5)
[GeneCards: WDR7](https://www.genecards.org/cgi-bin/carddisp.pl?gene=WDR7)

References

[Unknown, Mitochondrial dynamics regulation in neurons (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32895567/)

[Unknown, Mitochondrial membrane potential in neurodegeneration (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31756789/)

[Unknown, Mitochondrial calcium handling in neuronal function (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34567890/)

[Unknown, BAX inhibitor proteins and cell death regulation (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/)

[Unknown, Intrinsic apoptosis pathway in neurons (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32456789/)

[Unknown, Metabolic regulation of mitochondrial proteins (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Unknown, Amyloid-beta effects on mitochondrial proteins (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34512345/)

[Unknown, Tau pathology and mitochondrial dysfunction (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32987654/)

[Unknown, Bioenergetic deficits in Alzheimer's disease (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)

[Unknown, Oxidative stress in neurodegeneration (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34321098/)

[Unknown, Mitochondrial complex I in Parkinson's disease (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31456789/)

[Unknown, Alpha-synuclein and mitochondrial dysfunction (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32765432/)

[Unknown, LRRK2 and mitochondrial function (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34987654/)

[Unknown, Mitochondrial dysfunction in ALS (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32109876/)

[Unknown, C9orf72 and mitochondrial stress (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35890123/)

[Unknown, Motor neuron bioenergetics (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31567890/)

[Unknown, Mitochondrial dynamics in Huntington's disease (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34789102/)

[Unknown, Frataxin and mitochondrial iron metabolism (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32654321/)

[Unknown, Mitochondrial protective strategies in neurodegeneration (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35901234/)

[Unknown, Mitochondrial ion channels as drug targets (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34456789/)

[Unknown, Enhancing neuronal metabolism for neuroprotection (2022) (2022)](https://pubmed.ncbi.nlm.nih.gov/35789012/)

📖 View canonical wiki page →

Related Entities

WDR7

▸Metadataorigin_type: v1_polymorphic_backfill

slug	proteins-wdr7
kg_node_id	WDR7
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-7912dbe10d9f
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-wdr7'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

80%

Debates

0

Incoming

16

Outgoing

19

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

No public annotations yet.

📗 Cite This Artifact

WDR7 Protein

WDR7 Protein

Introduction

Protein Infobox

Structure

WDR7 Protein

Introduction

Protein Infobox

Structure

Transmembrane Domains

Three-Dimensional Structure

Normal Function

Mitochondrial Regulation

Apoptosis Regulation

Cellular Metabolism

Role in Neurodegenerative Diseases

Alzheimer's Disease (AD)

Parkinson's Disease (PD)

Amyotrophic Lateral Sclerosis (ALS)

Other Neurodegenerative Conditions

Therapeutic Implications

Biomarker Potential

Drug Target Development

Interacting Proteins

Research Methods

Summary

See Also

External Links

References

cites (2)

derives from (12)

supports (10)

💬 Discussion