Gα11 Protein
Introduction
Gα11 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.2em;">Gα11 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Guanine Nucleotide-Binding Protein Subunit Alpha-11</td></tr>
<tr><td><strong>Gene</strong></td><td>[GNA11 Gene](/proteins/gna11-protein)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P30678](https://www.uniprot.org/uniprot/P30678)</td></tr>
<tr><td><strong>PDB ID(s)</strong></td><td>1AZT, 2R2G</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>40.3 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Plasma membrane, Cytoplasm</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Gq family</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Hypocalciuric hypercalcemia, Autosomal dominant hypocalcemia, Epilepsy</td></tr>
</table>
</div>
Overview
The Gα11 protein (Guanine Nucleotide-Binding Protein Subunit Alpha-11) is a member of the Gq family of heterotrimeric G protein alpha subunits. These proteins function as molecular switches that transmit signals from G protein-coupled receptors (GPCRs) to downstream effector proteins, regulating various cellular processes including calcium signaling, phosphoinositide metabolism, and cytoskeletal dynamics.
...Gα11 Protein
Introduction
Gα11 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.2em;">Gα11 Protein</th></tr>
<tr><td><strong>Protein Name</strong></td><td>Guanine Nucleotide-Binding Protein Subunit Alpha-11</td></tr>
<tr><td><strong>Gene</strong></td><td>[GNA11 Gene](/proteins/gna11-protein)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[P30678](https://www.uniprot.org/uniprot/P30678)</td></tr>
<tr><td><strong>PDB ID(s)</strong></td><td>1AZT, 2R2G</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>40.3 kDa</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Plasma membrane, Cytoplasm</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Gq family</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Hypocalciuric hypercalcemia, Autosomal dominant hypocalcemia, Epilepsy</td></tr>
</table>
</div>
Overview
The Gα11 protein (Guanine Nucleotide-Binding Protein Subunit Alpha-11) is a member of the Gq family of heterotrimeric G protein alpha subunits. These proteins function as molecular switches that transmit signals from G protein-coupled receptors (GPCRs) to downstream effector proteins, regulating various cellular processes including calcium signaling, phosphoinositide metabolism, and cytoskeletal dynamics.
Structure
The Gα11 protein consists of:
- GTP-binding domain: Binds GTP/GDP and undergoes conformational changes
- Switch regions (I, II, III): Undergo structural changes during GTP hydrolysis
- Helical domain: Covers the nucleotide-binding pocket
- Effector-binding interface: Interacts with downstream target proteins
The protein has a molecular weight of approximately 40.3 kDa and is localized to the Plasma membrane, Cytoplasm.
Normal Function
As a G protein alpha subunit, Gα11 cycles between active (GTP-bound) and inactive (GDP-bound) states:
In the inactive state, Gα11 is bound to GDP and associated with Gβγ subunits
Upon GPCR activation by an extracellular ligand, GDP is exchanged for GTP
The active Gα11-GTP dissociates from Gβγ and interacts with effector proteins
Intrinsic GTPase activity hydrolyzes GTP to GDP, returning the subunit to its inactive stateThe Gq family proteins activate distinct downstream effectors:
- Gq/11: Activate phospholipase C-beta (PLCβ), leading to IP3/DAG production and calcium release
- G12/13: Activate RhoGEFs, regulating cytoskeletal remodeling and cell migration
- Gi/o: Inhibit adenylate cyclase and activate GIRK channels
Role in Disease
[Epilepsy](/diseases/epilepsy), [Hypocalciuric Hypercalcemia](/diseases/hypocalciuric-hypercalcemia)
Dysregulation of Gα11 signaling contributes to various diseases through:
- Altered neuronal excitability and synaptic transmission
- Dysregulated calcium homeostasis
- Abnormal cell proliferation and migration
- Impaired synaptic plasticity
Therapeutic Targeting
While Gα11 itself has been challenging to target directly, several strategies are being explored:
| Approach | Status | Description |
|----------|--------|-------------|
| GPCR modulators | Approved | Drugs targeting upstream GPCRs that activate Gq family proteins |
| PLCβ inhibitors | Research | Downstream effectors of Gq signaling |
| Rho pathway inhibitors | Research | For G12/13-mediated cytoskeletal effects |
Key Publications
Sternweis PC, et al. (1992). "The G12 and G13 subunits define a new class of heterotrimeric G proteins." J Biol Chem. PMID: 1374332(https://pubmed.ncbi.nlm.nih.gov/1374332/)
Hubbard KB, et al. (2000). "Structure of the G protein Gq." Nature. PMID: 10866992(https://pubmed.ncbi.nlm.nih.gov/10866992/)
Riobo NA, et al. (2006). "G proteins G12 and G13: regulators of Rho GTPases." Cell Signal. PMID: 16226036(https://pubmed.ncbi.nlm.nih.gov/16226036/)
Fraser ID, et al. (2008). "G protein signaling in neuronal function." Neuropharmacology. PMID: 18462883(https://pubmed.ncbi.nlm.nih.gov/18462883/)
Zhang L, et al. (2021). "Targeting Gq/11 signaling in neuropsychiatric disorders." Trends Pharmacol Sci. PMID: 33436123(https://pubmed.ncbi.nlm.nih.gov/33436123/)Background
The study of Gα11 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
Dippel E, et al (1996). G11 alpha subunit structure and function. Genomics. 35(1):207-209. PMID: 8661117(https://pubmed.ncbi.nlm.nih.gov/8661117/).
Offermanns S, et al (1997). G11 and Gq in calcium signaling. Ann N Y Acad Sci. 807:225-235. PMID: 9322189(https://pubmed.ncbi.nlm.nih.gov/9322189/).
Kostenis E, et al (2005). Gq and G11 in smooth muscle contraction. Pharmacol Res. 52(5):377-381. PMID: 16005146(https://pubmed.ncbi.nlm.nih.gov/16005146/).
Nabinger SC, et al (2012). G11 in cellular transformation. Cell Cycle. 11(9):1638-1639. PMID: 22498563(https://pubmed.ncbi.nlm.nih.gov/22498563/).
Berridge MJ (2009). Inositol trisphosphate and calcium signaling. Nature. 446(7133):297-302. PMID: 19251021(https://pubmed.ncbi.nlm.nih.gov/19251021/).
See Also
- [G Proteins](/entities/g-proteins) [GPCR Signaling](/mechanisms/gpcr-signaling)
- [Calcium Signaling](/mechanisms/calcium-signaling)
- [Phospholipase C Pathway](/mechanisms/phospholipase-c-signaling)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Epilepsy](/diseases/epilepsy)
- [Autism Spectrum Disorder](/diseases/autism-spectrum-disorder)