The herpesviruses have co-evolved with their hosts for hundreds of millions of years. As our adaptive immune systems evolved, so did the mechanisms of immune evasion encoded by herpesviruses. Because herpesviruses remain latent or persistent within their host throughout life, the herpesviruses have evolved a unique set of strategies to help them contend with the lifelong host immune response. This application?s central premise is that the herpesviruses, in their evolution, have performed a 100 million-year-long genetic screen to undermine host defense mechanisms, and in so doing, can illuminate cell biological processes that we may not yet understand; we seek to take advantage of their evolution to discover new concepts in cell biology. The long term goal of this project is to understand the underlying cell biological mechanisms by which human herpesviruses-6 and -7 (HHV-6/7) escape host defense mechanisms. The focus of this proposal is to understand how HHV-7 U21 reroutes class I MHC molecules to lysosomes, and in so doing, understand the cellular pathway usurped by U21. Our preliminary data indicate that U21 employs an unknown sorting mechanism that seems to defy convention - almost certainly utilizing a novel cellular means of lysosomal sorting.
In Aim 1, we assess the structure and association of U21 with itself, as a homotetramers, and determine whether homooligomerization of U21 is necessary its ability to bind to and reroute class I MHC molecules to lysosomes.
In Aim 2, we focus on the identification and characterization of cellular proteins involved in U21-class I trafficking to the endolysosomal compartment. We ultimately seek a temporal and mechanistic view of how U21 undermines the cellular lysosomal trafficking pathway, and how this lysosomal trafficking pathway functions in the absence of U21. A better understanding of this process should contribute to our understanding of basic underlying principles of lysosomal trafficking, and also lead to a more thorough comprehension of how these viruses have such great success in evading the host immune response.

Public Health Relevance

OF THIS RESEARCH TO PUBLIC HEALTH The function of lysosomes is of critical importance to a cell's ability to catabolize both extracellular ingested material, as well as intracellular substrates. To maintain a functioning lysosomal enterprise, proper targeting of lysosomal proteins to lysosomes is critical, a point underscored by the growing number of devastating genetic deficiencies ascribed to lysosomal storage disorders. A clearer understanding of how lysosomal proteins reach their destination will inform our ability to treat lysosomal storage diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM120735-03
Application #
9532907
Study Section
Membrane Biology and Protein Processing Study Section (MBPP)
Program Officer
Maas, Stefan
Project Start
2016-09-01
Project End
2020-07-31
Budget Start
2018-08-01
Budget End
2019-07-31
Support Year
3
Fiscal Year
2018
Total Cost
Indirect Cost
Name
Medical College of Wisconsin
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
937639060
City
Milwaukee
State
WI
Country
United States
Zip Code
53226