| NME1 - Nucleoside Diphosphate Kinase 1 | |
|---|---|
| Gene Symbol | NME1 |
| Full Name | NME/Nucleoside Diphosphate Kinase 1 |
| Chromosome | 17q21.33 |
| NCBI Gene ID | [4830](https://www.ncbi.nlm.nih.gov/gene/4830) |
| OMIM | [156010](https://www.omim.org/entry/156010) |
| Ensembl ID | ENSG00000214021 |
| UniProt ID | [P15531](https://www.uniprot.org/uniprot/P15531) |
| Protein Class | Nucleoside diphosphate kinase |
| Associated Diseases | Neuroblastoma, Various Cancers, AD/PD |
NME1 (NME Nucleoside Diphosphate Kinase 1), also known as NDPK1 (Nucleoside Diphosphate Kinase 1), is a ubiquitous enzyme that catalyzes the transfer of phosphate groups between nucleoside diphosphates (NDPs) and nucleoside triphosphates (NTPs). Originally discovered as a metastasis suppressor gene in melanoma and breast cancer[^nme1_nature_1996], NME1 plays crucial roles in maintaining cellular nucleotide pools, mitochondrial function, and has been increasingly studied for its potential roles in neuronal survival and neurodegenerative diseases[^nme1_cancer_2003].
The NME1 protein is highly conserved across species and is one of several NME family members in humans (NME1-NME10). While primarily known for its enzymatic function in nucleotide metabolism, NME1 has been implicated in various cellular processes including DNA repair, gene transcription, and apoptosis[^nme1_cancer_2003].
This comprehensive review examines the structure, function, expression patterns, and disease associations of NME1, with particular emphasis on its potential relevance to Alzheimer's disease, Parkinson's disease, and related neurodegenerative conditions.
The NME1 gene (Gene ID: 4830) is located on chromosome 17q21.33 and encodes a 152-amino acid protein with a molecular weight of approximately 17 kDa. The gene consists of a single exon encoding the complete protein, and is part of the NME family that includes at least nine related genes in humans.
Structural Features:
NME1 forms a homohexameric complex in solution, though heterooligomers with the related NME2 protein can also form[^nme1_dimer]. Each subunit adopts the characteristic NDP kinase fold.
NME1 encodes a 17 kDa protein that functions as a homodecameric enzyme. Each subunit contains the characteristic nucleoside diphosphate kinase active site. The enzyme catalyzes the reaction:
NDP + NTP ⇌ NTP + NDP
This reaction is essential for:
Beyond its NDP kinase activity, NME1 exhibits protein kinase activity[^nme1_kinase], allowing it to phosphorylate specific protein substrates. This activity contributes to its roles in:
NME1 can bind to DNA and possesses DNA endonuclease activity[^nme1_dna_repair]. This function relates to its proposed roles in:
Recent research has revealed that NME1 localizes to mitochondria and controls the mitochondrial nucleoside diphosphate pool[^nme1_mitochondria_2015]. This mitochondrial function is critical for:
Loss of NME1 leads to mitochondrial dysfunction, increased reactive oxygen species (ROS), and reduced cell viability — all hallmarks of neurodegenerative processes.
NME1 is expressed in most human tissues:
| Tissue Type | Expression Level |
|---|---|
| Brain | Moderate-high |
| Liver | High |
| Skeletal muscle | High |
| Heart | Moderate |
| Kidney | Moderate |
| Lung | Moderate |
In the brain, NME1 is expressed in both neurons and glial cells, with higher expression in regions with high metabolic demand. Within the brain, NME1 expression is detected in:
NME1 localizes to multiple cellular compartments:
While not a primary AD risk gene, NME1 may play modulatory roles in Alzheimer's disease pathogenesis:
In Parkinson's disease, mitochondrial dysfunction is a central pathogenic mechanism[^nme1_mitochondria]:
Studies in C. elegans have shown that the NME1 homolog plays essential roles in neuronal development and survival. Knockdown models exhibit:
NME1 was originally identified as a metastasis suppressor[^nme1_cancer]:
NME1 is particularly relevant in neuroblastoma (the condition that gave it the name "Nm23"):
Emerging evidence suggests NME1 may be involved in[^nme1_neuro]:
NME1 interacts with multiple proteins:
| Partner | Interaction Type | Functional Effect |
|---|---|---|
| NME2 | Oligomerization | Enhanced activity |
| p53 | Protein binding | Apoptosis regulation |
| KSR | Kinase substrate | MAPK signaling |
| HOX proteins | Protein binding | Transcriptional regulation |
| Actin | Binding | Cytoskeletal function |
NME1 expression status guides treatment decisions in some cancers. Strategies targeting NME1 include[^nme1_therapy]:
For neurodegenerative diseases, therapeutic strategies may include:
Key open questions include:
NME1 is highly conserved across species:
| Species | Homolog | Conservation |
|---|---|---|
| Human | NME1 | Reference |
| Mouse | Nme1 | 95% identical |
| Zebrafish | nme1 | 85% identical |
| C. elegans | nmk-1 | 75% identical |
| D. melanogaster | Nm23 | 80% identical |
The high conservation underscores essential cellular functions.