Mlst8 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
MLST8 (MTOR Associated Protein, LST8 Homolog) is a conserved protein component of both mTORC1 and mTORC2 (mechanistic Target of Rapamycin Complexes 1 and 2). The gene encodes a 326-amino acid protein with seven WD-repeat domains that form a beta-propeller structure. MLST8 is essential for the structural integrity and function of both [mTOR](/entities/mtor) complexes, though it is not equally essential for all their functions. In the nervous system, MLST8 plays critical roles in neuronal growth, synaptic plasticity, and various aspects of brain development and function. [@jankel2021]
Gene Structure
The MLST8 gene consists of:
14 exons spanning approximately 14 kb
Multiple transcription start sites
Alternative splicing producing isoforms
Protein Structure
MLST8 is a 36 kDa protein characterized by:
Seven WD40 repeat domains
Beta-propeller structure
Forms part of the HEAT repeat superstructure in mTOR complexes
Multiple protein-protein interaction surfaces
Molecular Function
mTOR Complex 1 (mTORC1)
MLST8 interacts with:
mTOR kinase (core component)
Raptor (regulatory protein)
Deptor (negative regulator)
Functions:
Modulates mTORC1 substrate access
Stabilizes mTORC1 structure
Involved in amino acid sensing (via Rag GTPases)
mTOR Complex 2 (mTORC2)
MLST8 interacts with:
mTOR kinase
Rictor (defining subunit)
Protor-1/2 (regulatory subunits)
Deptor
Functions:
Essential for mTORC2 assembly
Regulates AGC kinase phosphorylation
Involved in actin cytoskeleton organization
Expression Pattern
MLST8 is widely expressed:
Brain: High expression in [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), cerebellum
[Neurons](/entities/neurons): Dendrites and synapses
Glia: [Astrocytes](/entities/astrocytes) and oligodendrocytes
Peripheral tissues: Ubiquitous but lower than brain
Role in Neurodegeneration
Alzheimer's Disease
mTOR hyperactivity implicated in AD pathogenesis
MLST8 contributes to mTORC1 overactivation
Dysregulated autophagy in AD involves mTOR signaling
Therapeutic targeting: mTOR inhibitors being explored
Relationship to amyloid and [tau](/proteins/tau) pathology
The study of Mlst8 Gene 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.
[Kim DH, et al, mLST8 is an essential component of the mTOR complex (2002)](https://pubmed.ncbi.nlm.nih.gov/12401943/)
[Guertin DA, et al, Ablation in mice of the mTORC2 component rictor or mLST8 reveals that rictor is essential for growth (2006)](https://pubmed.ncbi.nlm.nih.gov/16682218/)
[Ehninger D, et al, From circuit repair to brain repair: mTOR inhibition for spinal cord injury (2014)](https://pubmed.ncbi.nlm.nih.gov/25151264/)
[Lipton JO, Sahin M, The neurology of mTOR (2014)](https://pubmed.ncbi.nlm.nih.gov/24462094/)
[Swiech L, et al, Role of mTOR in neurological disorders (2018)](https://pubmed.ncbi.nlm.nih.gov/29368177/)
[Troca-Marin JA, et al, The mTORC1 component Raptor controls the mTORC2 component MLST8 in the regulation of synaptic transmission (2017)](https://pubmed.ncbi.nlm.nih.gov/28639483/)
[Maiese K, Targeting mTOR: evaluating new therapeutic strategies for Alzheimer's disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32130716/)
[Jankel SK, et al, MLST8 variants and neurological disease (2021)](https://pubmed.ncbi.nlm.nih.gov/33340482/)
Pathway Diagram
The following diagram shows the key molecular relationships involving MLST8 Gene discovered through SciDEX knowledge graph analysis: