The secretory pathway folds, assembles, and sorts membrane and secreted proteins and targets them to a variety of locations inside and outside the cell. The `Grand Central Station' of the cell is the trans Golgi network (TGN), an incredibly dynamic and complex structure that packages cargo into separate containers and dispatches them to their terminal destinations. The AP-3 trafficking complex sorts cargo from endosomes or the Golgi into containers bound for endolysosomal compartments, bypassing the endosomal multivesicular body and ESCRT pathway. AP-3 is needed for productive assembly of HIV and other viral capsids. Genetic lesions impairing AP-3 function cause multiple diseases, including Hermansky-Pudlak Syndrome type 2 and an epilepsy-like syndrome. Despite its importance, remarkably little is known about the mechanisms of AP-3 function. In this collaborative Project, we exploit published and unpublished genetic, cell biological, and biochemical advances, and employ state of the art imaging approaches, to dissect the mechanisms of AP-3 budding and the consequences of AP-3 function for the overall dynamics of the TGN, in the model organism Saccharomyces cerevisiae.
In Aim 1, we build on proteomic surveys, functional genomic surveys, and follow-up analyses, wich identify new candidate AP-3 cofactors including a ubiquitin ligase. We will use these advances to test hypotheses about the assembly, maturation, and dispatch of AP-3 vesicles from the TGN.
In Aim 2, we build on preliminary findings showing that disruption of AP-3 activity causes striking and unexpected global perturbations of Golgi architecture. We hypothesize, based on published and unpublished data, that distinct carriers exit the TGN in a programmed, sequential manner, with AP-3 carriers departing early. We will further test this model and dissect the molecular mechanisms though which the sequence of events is programmed. Together, these studies should establish new paradigms for AP-3 vesicle formation and for organelle maturation dynamics in the Golgi-endolysosomal system.

Public Health Relevance

The proposed research is relevant to public health because AP-3 is essential for normal cellular function and is subverted for the assembly of viruses, including HIV-1. Defects in AP-3 function cause diseases, including Hermansky-Pudlak Syndrome type 2. Therefore, the proposed research is relevant to the mission of NIGMS in understanding biological processes as a foundation for advances in disease diagnosis, treatment, and prevention.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM130644-02
Application #
10017291
Study Section
Membrane Biology and Protein Processing Study Section (MBPP)
Program Officer
Ainsztein, Alexandra M
Project Start
2019-09-12
Project End
2023-07-31
Budget Start
2020-08-01
Budget End
2021-07-31
Support Year
2
Fiscal Year
2020
Total Cost
Indirect Cost
Name
University of Washington
Department
Biochemistry
Type
Schools of Medicine
DUNS #
605799469
City
Seattle
State
WA
Country
United States
Zip Code
98195