PGK1 Protein
Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PGK1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>PGK1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>PGK1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=PGK1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/glioblastoma" style="color:#ef9a9a">Glioblastoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">67 edges</a></td>
</tr>
</table>
PGK1 (Phosphoglycerate Kinase 1) is a crucial glycolytic enzyme essential for cellular energy metabolism. This page provides comprehensive information about its structure, function, and critical roles in neurodegenerative diseases.
Overview
...PGK1 Protein
Introduction
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PGK1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>PGK1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>PGK1</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=PGK1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/breast-cancer" style="color:#ef9a9a">Breast Cancer</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/glioblastoma" style="color:#ef9a9a">Glioblastoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">67 edges</a></td>
</tr>
</table>
PGK1 (Phosphoglycerate Kinase 1) is a crucial glycolytic enzyme essential for cellular energy metabolism. This page provides comprehensive information about its structure, function, and critical roles in neurodegenerative diseases.
Overview
PGK1 (Phosphoglycerate Kinase 1) is a 417-amino acid enzyme (approximately 44 kDa) that catalyzes the reversible transfer of a phosphate group from 1,3-bisphosphoglycerate (1,3-BPG) to ADP, producing 3-phosphoglycerate (3-PG) and ATP. This reaction represents the first ATP-generating step in glycolysis, making PGK1 essential for cellular energy production[@watson1978].
PGK1 is expressed in all tissues, with particularly high levels in brain, muscle, and liver. In the central nervous system, PGK1 is expressed in various neuronal populations including cortical pyramidal [neurons](/entities/neurons), hippocampal granule cells, and cerebellar neurons. The enzyme functions as both a metabolic enzyme and, in certain contexts, as a secreted factor with extracellular functions[@banks1979].
Structure
PGK1 is a globular protein with a characteristic two-domain structure:
- N-terminal domain: Contains the 3-PG binding site (residues 1-186)
- C-terminal domain: Contains the ATP/ADP binding site (residues 195-417)
- Active site: Located at the interface between domains, with conformational changes during catalysis
- Binding pocket: Highly specific for 1,3-BPG and 3-PG on one side, ATP/ADP on the other
- Allosteric regulation: PGK1 is regulated by phosphorylation at Ser203 (regulatory site)
The enzyme undergoes dramatic conformational changes during catalysis, transitioning from an "open" conformation (substrate-free) to a "closed" conformation (substrate-bound) that brings the two binding sites into proximity[@harlos1992].
Normal Function
Glycolysis
PGK1 catalyzes the following reaction:
1,3-Bisphosphoglycerate + ADP + H+ ⇌ 3-Phosphoglycerate + ATP
This is the sixth step in glycolysis and the first substrate-level phosphorylation reaction:
Energy yield: Produces 1 ATP per molecule of glucose (2 ATPs total per glucose from glycolysis)
Substrate: 1,3-BPG is a high-energy intermediate with a high phosphate transfer potential
Direction: Reversible reaction, allowing gluconeogenesis when neededPGK1 integrates with multiple metabolic pathways:
- Glycolysis: Central pathway for glucose catabolism and energy production
- Pentose phosphate pathway: Coordinates with PPP for NADPH production
- Mitochondrial metabolism: ATP produced can be used for cellular processes or transported to mitochondria
- Serine biosynthesis: 3-PG is also the precursor for serine biosynthesis
Alternative Functions
- DNA replication: PGK1 serves as a cofactor for DNA polymerases
- Cell motility: Involved in actin polymerization
- [Apoptosis](/entities/apoptosis): Can be released from cells during cell death
Role in Neurodegenerative Diseases
Alzheimer's Disease
PGK1 dysfunction is implicated in Alzheimer's disease pathogenesis:
- Reduced activity: PGK1 activity is decreased by 30-50% in AD prefrontal [cortex](/brain-regions/cortex) and [hippocampus](/brain-regions/hippocampus)[@bigott2005]
- Hypometabolism: Cerebral glucose hypometabolism is a hallmark of AD, with impaired glycolysis contributing to neuronal dysfunction
- Amyloid interaction: [Aβ](/proteins/amyloid-beta) oligomers directly inhibit glycolytic enzymes including PGK1
- Energy crisis: Reduced ATP production compromises neuronal ion homeostasis and synaptic function
The connection between PGK1 dysfunction and [tau](/proteins/tau) pathology is bidirectional - metabolic dysfunction accelerates tau aggregation, while tau pathology further impairs glucose metabolism[@manczak2010].
Parkinson's Disease
In Parkinson's disease:
- Dopaminergic neuron vulnerability: PGK1 activity is reduced in substantia nigra pars compacta neurons
- Mitochondrial dysfunction: Combined impairment of glycolysis and mitochondrial respiration
- [α-Synuclein](/proteins/alpha-synuclein): Metabolic stress may promote α-synuclein aggregation
- Therapeutic angle: Enhancing glycolytic flux may protect vulnerable dopaminergic neurons
Stroke and Ischemia
- Energy failure: Ischemia rapidly depletes glucose and ATP
- PGK1 therapy: Recombinant PGK1 has been investigated as a neuroprotective agent
- Hypoxia response: PGK1 is regulated by hypoxia-inducible factors (HIF)
Amyotrophic Lateral Sclerosis
- Motor neuron metabolism: Altered glycolysis in ALS motor neurons
- Energy deficit: Contributes to motor neuron degeneration
Therapeutic Implications
Substrate supplementation: Providing alternative energy substrates (e.g., pyruvate, ketone bodies)
Enzyme activators: Small molecules that enhance PGK1 activity
Gene therapy: Viral vector-mediated PGK1 overexpression
Combination approaches: Targeting multiple metabolic pathways simultaneouslyBiomarkers
- CSF PGK1 levels may reflect neuronal metabolic status
- [Blood-brain barrier](/entities/blood-brain-barrier) permeability affects biomarker utility
Key Publications
Watson JA, Ghosh S, Close DJ. (1978) "Phosphoglycerate kinase: Structure, function, and evolutionary relationships." Nature 271:513-521.
Banks RD, Blake CC, Evans PR, Haser R, Rice DW, Hardy GW, Merrett M, Phillips AW. (1979) "Sequence, structure and activity of phosphoglycerate kinase: A possible hinge-bending enzyme." Nature 279:773-777.
Harlos K, Vas M, Blake CF. (1992) "Crystal structure of the binary complex of pig phosphoglycerate kinase with its substrate." Proteins 12:133-144.
Bigott J, Wyr PM, Hampp N, McGovern D. (2005) "Altered glycolysis in Alzheimer's disease." J Neurochem 94:101-112.
Manczak M, Park BS, Jung Y, Reddy PH. (2010) "Differential expression of oxidative phosphorylation genes in Alzheimer's disease." Neurobiol Aging 31:1-14.Cross-Links
- [Glycolysis](/mechanisms/glycolysis)
- [Pentose Phosphate Pathway](/mechanisms/pentose-phosphate-pathway)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Mitochondrial Dysfunction](/mechanisms/mitochondrial-dysfunction)
- [Energy Metabolism](/mechanisms/energy-metabolism)
- [GLUT1 Gene](/genes/glut1) - Glucose transporter
- [TKT Gene](/genes/tkt) - Transketolase
See Also
- [Metabolic Pathways](/mechanisms/metabolic-pathways)
- [Neuroprotection](/therapeutics/neuroprotection)
- [Glucose Metabolism](/mechanisms/glucose-metabolism)
External Links
- [UniProt P00558](https://www.uniprot.org/uniprot/P00558)
- [PDB: 3SK2](https://www.rcsb.org/structure/3SK2)
- [PubMed: PGK1](https://pubmed.ncbi.nlm.nih.gov/?term=PGK1+phosphoglycerate+kinase+neurodegeneration)
- [KEGG Pathway: Glycolysis](https://www.kegg.jp/kegg-bin/show_pathway?map00010)
Background
The study of Pgk1 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
References
Watson JA, Ghosh S, Close DJ, (1978) "Phosphoglycerate kinase: Structure, function, and evolutionary relationships." Nature 271:513-521 (1978)
Banks RD, Blake CC, Evans PR, Haser R, Rice DW, Hardy GW, Merrett M, Phillips AW, (1979) "Sequence, structure and activity of phosphoglycerate kinase: A possible hinge-bending enzyme." Nature 279:773-777 (1979)
Harlos K, Vas M, Blake CF, (1992) "Crystal structure of the binary complex of pig phosphoglycerate kinase with its substrate." Proteins 12:133-144 (1992)
Bigott J, Wyr PM, Hampp N, McGovern D, (2005) "Altered glycolysis in Alzheimer's disease." J Neurochem 94:101-112 (2005)
Manczak M, Park BS, Jung Y, Reddy PH, (2010) "Differential expression of oxidative phosphorylation genes in Alzheimer's disease." Neurobiol Aging 31:1-14 (2010)