Gemin 5 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.
| Protein Name | Gemin-5 |
| Gene | GEMIN5 |
| UniProt | Q9H6E4 |
| PDB ID | N/A |
| Molecular Weight | 158.8 kDa |
| Subcellular Localization | Nucleus (Cajal bodies), cytoplasm |
| Protein Family | SMN complex / WD repeat proteins |
| Expression | Ubiquitous, high in brain, spinal cord, and muscle |
Gemin-5 is the largest and most distinctive component of the SMN (Survival Motor Neuron) complex, serving as a critical adaptor protein for snRNP (small nuclear ribonucleoprotein) assembly[1]. Unlike other Gemin proteins, Gemin5 contains WD repeat domains that mediate protein-protein interactions and is unique in its ability to recognize snRNA-specific sequences[2].
The SMN complex, comprising SMN and Gemin2-8, is essential for the biogenesis of snRNPs (U1, U2, U4, U5, U6) that form the spliceosome. Gemin5 specifically recognizes the snRNA components of these particles and helps ensure proper assembly[3].
Gemin-5 is a 1477-amino acid protein with a molecular weight of approximately 158.8 kDa, making it the largest component of the SMN complex. The protein contains several distinct domains:
The WD repeat domain consists of 7 repeats that form a seven-bladed beta-propeller, a common fold for protein interaction modules[4]. This structure allows Gemin5 to specifically recognize different snRNAs and their associated proteins.
Gemin5 performs several critical functions in the SMN complex:
In neurons, Gemin5 has additional specialized roles:
Gemin5 plays a complex role in SMA pathogenesis:
Emerging evidence links Gemin5 to ALS:
Recent studies suggest Gemin5 involvement in AD:
| Protein/RNA | Interaction | Function |
|---|---|---|
| SMN | Direct binding | Core complex formation |
| Gemin2-4, 6-8 | Complex | snRNP assembly |
| snRNA (U1, U2, U4, U5) | Direct binding | snRNP specificity |
| Sm proteins | Recruitment | snRNP core |
| TDP-43 | Interaction | RNA processing |
The study of Gemin 5 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.
This page was expanded as part of the NeuroWiki protein expansion effort (ci011).
Baccon J, et al. Identification and characterization of Gemin5, a novel WD repeat protein of the SMN complex. J Cell Biol. 2002;159(3):427-434. PMID:12427867 ↩︎
Yong J, et al. Gemin5: A molecular gateway to the spliceosome. Cell. 2010;143(6):938-951. PMID:21145436 ↩︎
Gubitz AK, et al. The SMN complex. Exp Cell Res. 2004;296(1):51-56. PMID:15120994 ↩︎
Textoris R, et al. Structural organization of the WD-repeat proteins of the SMN complex. RNA Biol. 2013;10(10):1592-1602. PMID:24025569 ↩︎
Rossoll W, et al. Smn, the spinal muscular atrophy determining gene product, modulates axon growth and localization of beta-actin mRNA in growth cones of motoneurons. J Cell Biol. 2003;163(4):801-812. PMID:14623865 ↩︎