Cytoplasmic dynein is a molecular motor crucially involved in many processes essential for correct neurological function. Its improper function causes failed neurodevelopment (e.g. Miller- Dieker Lissencephaly), neurodegeneration, and other cognitive diseases such as schizophrenia. The wide range of dynein roles is made possible by tuning its function with accessory proteins such as Lis1, NudE, and NudEL. However, while genetic studies, both via mutagenesis in model organisms, and via identification of causative/risk factors in human disease, have repeatedly established that these proteins are in the dynein pathway and are important for dynein function-that is, dynein-mediated transport is impaired when their function is lost-mechanistically it has been impossible to determine what they do, or why they are important. Lacking such knowledge makes understanding disease progression difficult, as well as making it impossible to rationally design therapeutic approaches to correct the impairments. Our work determines at a mechanistic level exactly how the different cofactors alter dynein function, and starts to determine the ways that these co-factors effects on dynein are themselves regulated. At a mechanistic level, we will better understand how dynein is turned off by NudE, and then re-activated by Lis1. At a global level, we will determine functionally what NudEL does to dynein function (if anything), and how the function of NudE, NudEL, and Lis1 are altered by phosphorylation. Since dynein is crucial for many aspects of neuronal function, this will importantly advance the general field of neurobiology, and possibly allow design of more targeted therapeutic approaches.

Public Health Relevance

Dynein-based transport is directly related to public health: viruses such as herpes and adenovirus employ dynein to spread through cells and important cargos like mitochondria and endosomes are positioned by dynein. Altered dynein function is linked to neurodegeneration. Mutations in the protein Lis1 studied here are linked to the human neurodevelopmental disease Miller-Dieker Lissencephaly.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM070676-08
Application #
8636479
Study Section
Synapses, Cytoskeleton and Trafficking Study Section (SYN)
Program Officer
Gindhart, Joseph G
Project Start
2005-03-01
Project End
2015-03-31
Budget Start
2014-04-01
Budget End
2015-03-31
Support Year
8
Fiscal Year
2014
Total Cost
$295,170
Indirect Cost
$65,263
Name
University of California Irvine
Department
Anatomy/Cell Biology
Type
Schools of Arts and Sciences
DUNS #
046705849
City
Irvine
State
CA
Country
United States
Zip Code
92697
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