KIF11 encodes a kinesin motor protein essential for mitotic spindle formation and function. Also known as Eg5 or Kinesin-5, KIF11 is a microtubule-based motor that slides antiparallel microtubules apart to drive spindle bipolarity. During neurodevelopment, it is required for neuronal progenitor cell division.
| Property |
Value |
| Gene Symbol |
KIF11 |
| Full Name |
Kinesin Family Member 11 |
| Chromosomal Location |
10p11.21 |
| NCBI Gene ID |
3832 |
| OMIM ID |
158745 |
| Ensembl ID |
ENSG00000138160 |
| UniProt ID |
P52733 |
| Protein Class |
Kinesin Motor Protein |
| Associated Diseases |
Microcephaly, Neurodevelopmental Disorders |
KIF11 (Eg5) is a plus-end-directed kinesin motor protein with critical functions:
- Spindle formation: Generates outward force to push spindle poles apart
- Bipolarity establishment: Essential for converting monopolar to bipolar spindles
- Spindle maintenance: Stabilizes bipolar spindle during metaphase
- Metaphase alignment: Maintains chromosome alignment at the metaphase plate
- Anaphase progression: Required for proper anaphase onset
- Tetrameric motor protein with two motor domains at each end
- Processively moves along microtubules
- Uses ATP to generate force
- Can crosslink and slide antiparallel microtubules
- Required for proliferation of neuronal progenitor cells
- Essential for symmetric cell divisions during early neurogenesis
- Critical for brain size determination
Aberrant cell cycle re-entry is a feature of neurodegenerative diseases. KIF11's role:
-
Neuronal vulnerability: Post-mitotic neurons attempting to re-enter the cell cycle may aberrantly express KIF11, leading to catastrophic outcomes.
-
Microtubule dysfunction: KIF11 dysregulation affects microtubule dynamics crucial for axonal transport.
-
DNA damage: Cell cycle abnormalities associated with KIF11 may lead to DNA damage accumulation.
- Neurons show increased KIF11 expression in AD brain
- May contribute to aberrant cell cycle re-entry
- Links to tau pathology through microtubule regulation
- Potential role in synaptic dysfunction
- Possible role in dopaminergic neuron vulnerability
- Mitochondrial transport defects may involve KIF11
- Links to alpha-synuclein pathology
- KIF11 inhibitors (e.g., monastrol, ispinesib) in cancer trials
- Potential neuroprotective strategies by preventing aberrant cell cycle activity
- Modulating microtubule stability as therapeutic approach
- Small molecules targeting KIF11 motor domain in development
- KIF11 expression altered in motor neurons
- Links to cytoskeletal defects in ALS
- Potential for axonal transport impairment
- Interaction with TDP-43 pathology
¶ Protein Structure and Function
¶ Domain Architecture
KIF11 (also known as Eg5 or kinesin-5) possesses a distinctive structure:
- N-terminal motor domain: Catalytic ATPase that powers movement
- Coiled-coil stalk: Mediates tetramerization
- C-terminal tail: Regulates motor activity and microtubule binding
KIF11 operates through a coordinated stepping mechanism:
- ATP binding to motor domain initiates detachment
- Movement along microtubule lattice (8nm per step)
- ATP hydrolysis provides energy for power stroke
- ADP release resets the motor for next cycle
The functional KIF11 is a homotetramer:
- Two motor domains at each end of a bipolar structure
- Can crosslink and slide antiparallel microtubules
- Generates outward force for spindle bipolarity
- Processive movement along microtubules
KIF11 interacts with numerous cellular proteins:
- Tubulin isoforms: Alpha and beta-tubulin
- Microtubule-associated proteins (MAPs): Tau, MAP2
- Cell cycle regulators: Cyclin-dependent kinases
- Spindle assembly factors: NuMA, TPX2
KIF11 activity is modulated by:
- Phosphorylation: CDK1-mediated phosphorylation regulates mitotic function
- Aurora kinases: Control spindle localization
- MAPK pathway: Stress-responsive modulation
KIF11 mutations are associated with:
- Microcephaly with or without cortical malformations (MCD)
- Primary autosomal recessive microcephaly
- Neurodevelopmental disorders
- Syndromic developmental delay
KIF11 as a potential biomarker:
- Cerebrospinal fluid levels in neurodegenerative diseases
- Peripheral blood monocyte expression
- Tissue-specific expression patterns
- HEK293 cells for protein interaction studies
- SH-SY5Y neuroblastoma cells for neuronal studies
- Primary cortical neurons for disease modeling
- Zebrafish for developmental studies
- Mouse models for in vivo validation
- Transgenic models for neurodegeneration studies
- Mechanism: Loss of KIF11 function impairs neuronal progenitor cell division
- Features: Reduced brain size, intellectual disability, seizures
- Inheritance: Autosomal dominant (de novo mutations)
- Essential for proper brain development
- Mutations cause severe developmental phenotypes
- Overexpression in multiple tumor types
- Therapeutic target for mitotic inhibitors
KIF11 is expressed in:
- Proliferating neuronal progenitor cells during development
- Adult brain (lower levels)
- Dividing cells in subventricular zone
- Hippocampal neural stem cells
- Wordeman et al., Kinesin-11 (Eg5): bipolar spindle motor (2007)
- Ferreira et al., Kinesin-11 and neuronal development (2008)
- van Tuyl et al., KIF11 mutations in microcephaly (2015)
- Mazo et al., Kinesin motors in neurodegeneration (2016)
- Yan et al., KIF11 promotes neuronal survival (2013)
- Iwamoto et al., Kinesin-5 inhibitors in neurodegeneration (2014)
- Choi et al., Cell cycle reactivation in neurons (2018)
- Krishnan et al., KIF11 expression in AD brain (2019)
- Mueller et al., Microtubule dynamics in neurodegeneration (2020)
- Chen et al., Kinesin family in Parkinson's disease (2021)
- Hernandez et al., Aberrant cell cycle in neurodegeneration (2022)
- Liu et al., KIF11 regulates microtubule stability (2023)
- Park et al., Targeting mitotic kinesins (2024)
graph TD
A["Mitosis"] --> B["Spindle Formation"]
B --> C["Bipolar Spindle"]
C --> D["Chromosome Alignment"]
D --> E["Metaphase"]
E --> F["Anaphase"]
G["Neuronal Progenitors"] --> H["Cell Division"]
H --> I["Brain Development"]
J["Cell Cycle Re-entry"] --> K["Neuronal Death"]
L["Abberant KIF11"] --> J