SLC30A10 (Zinc Transporter 10) is a critical membrane transporter protein that plays essential roles in metal ion homeostasis, particularly manganese and zinc. This protein has emerged as particularly important in neurodegenerative diseases due to its role in preventing manganese accumulation in the brain.
| Zinc Transporter 10 |
|---|
| Protein Name | Zinc Transporter 10 |
| Gene | SLC30A10 |
| UniProt ID | Q6XR72 |
| PDB ID | None |
| Molecular Weight | 50 kDa |
| Subcellular Location | Plasma membrane |
| Protein Family | ZnT family (SLC30) |
SLC30A10 (also known as ZnT10) is a member of the zinc transporter (ZnT) family, which consists of ten members (ZnT1-10) that facilitate zinc and/or manganese efflux from cells or into intracellular organelles.
While originally characterized as a zinc transporter, SLC30A10 has proven to be a major manganese transporter with critical importance in preventing manganese neurotoxicity.
¶ Gene and Protein Structure
The SLC30A10 gene is located on chromosome 1q41 and encodes a protein of approximately 460 amino acids. The gene is expressed in multiple tissues, with particularly high expression in the brain, liver, and intestine.
SLC30A10 has characteristic features of ZnT family proteins:
- Six transmembrane domains: Form the metal transport channel
- N-terminal extracellular loop: Contains metal binding sites
- C-terminal intracellular domain: Regulates transport activity
- HEXXH motif: Conserved metal binding sequence in transmembrane domain 5
SLC30A10 functions as a metal ion antiporter:
- Manganese efflux: Primary function - exports manganese from cells
- Zinc transport: Can also transport zinc, though with lower affinity
- Cellular homeostasis: Prevents accumulation of toxic metal levels
- Blood-brain barrier: Expressed at BBB, regulates brain manganese entry
- Neurons: Protects dopaminergic neurons from manganese toxicity
- Astrocytes: Major site of brain manganese handling
- Liver: Involved in systemic manganese excretion
- Intestine: Regulates dietary manganese absorption
SLC30A10 is central to understanding manganism:
- Loss-of-function mutations: Cause hereditary manganese metabolism disorder
- Manganese accumulation: Loss leads to excess manganese in basal ganglia
- Parkinsonian features: Clinical presentation resembles PD but distinct
- Exposed populations: Welders and industrial workers at risk
SLC30A10 has relevance to idiopathic PD:
- Dopaminergic neurons: High manganese exposure selectively affects these neurons
- Genetic variants: May modify PD risk in exposed populations
- Metal interaction: Manganese can interact with alpha-synuclein aggregation
- Amyotrophic Lateral Sclerosis: Altered metal homeostasis
- Huntington's Disease: Manganese dysregulation reported
- Wilson Disease: Copper-zinc interactions
SLC30A10 is a therapeutic target:
- Chelation therapy: Can reduce manganese levels in affected individuals
- Gene therapy: Potential for SLC30A10 gene delivery
- Small molecule modulators: Transport activity modulators in development
- Genetic testing: SLC30A10 variants identify at-risk individuals
- Manganese levels: Blood/urine manganese as exposure biomarker