LRSAM1 (Leucine-Rich Repeat and Sterile Alpha Motif-Containing Protein 1) is an E3 ubiquitin ligase that plays critical roles in neuronal function, [autophagy](/entities/autophagy), and immune signaling. Mutations in the LRSAM1 gene are associated with Charcot-Marie-Tooth disease type 2P (CMT2P), a hereditary peripheral neuropathy, and with increased risk of Parkinson's disease. This protein is essential for proper neuronal morphology, synaptic function, and cellular quality control mechanisms.
LRSAM1 (Leucine-Rich Repeat and Sterile Alpha Motif-Containing Protein 1) is an E3 ubiquitin ligase that plays critical roles in neuronal function, [autophagy](/entities/autophagy), and immune signaling. Mutations in the LRSAM1 gene are associated with Charcot-Marie-Tooth disease type 2P (CMT2P), a hereditary peripheral neuropathy, and with increased risk of Parkinson's disease. This protein is essential for proper neuronal morphology, synaptic function, and cellular quality control mechanisms.
Overview
LRSAM1 is a multi-domain E3 ubiquitin ligase expressed predominantly in the nervous system. It contains an N-terminal RING finger domain with ubiquitin ligase activity, followed by leucine-rich repeats (LRRs), a sterile alpha motif (SAM), and a C-terminal coiled-coil domain. The protein localizes to various cellular compartments including the plasma membrane, endosomes, and autophagosomes, where it catalyzes the attachment of ubiquitin to substrate proteins. [@mcgough2014]
Gene and Protein
Gene Information [1]
Gene Symbol: LRSAM1 (also called RNF193)
Chromosomal Location: 9q33.3
Alternative Names: RING finger protein 193, Hucep-6
Transcript Variants: Multiple isoforms described
Expression: High in brain, spinal cord, and peripheral nerves
Protein Structure
RING Finger Domain: Zinc-binding E3 ligase domain (C3H2C3)
The study of Lrsam1 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.
External Links
[PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
[Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
[Lupo et al., LRSAM1 Gene and Protein Structure (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27262406/)
[McGough et al., LRSAM1 Is an E3 Ubiquitin Ligase (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/24797425/)
[Saifi et al., LRSAM1 Mutations Cause CMT2P (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25736437/)
[Deng et al., LRSAM1 Variants and Parkinson's Disease Risk (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/30653614/)
[Zhou et al., LRSAM1 and TDP-43 in ALS (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32841276/)