A high-throughput screen for chemical inhibitors of exocytic transport in yeast

TY - JOUR

T1 - A high-throughput screen for chemical inhibitors of exocytic transport in yeast

AU - Zhang, Lisha

AU - Nebane, N Miranda

AU - Wennerberg, Krister

AU - Li, Yujie

AU - Neubauer, Valerie

AU - Hobrath, Judith V

AU - McKellip, Sara

AU - Rasmussen, Lynn

AU - Shindo, Nice

AU - Sosa, Melinda

AU - Maddry, Joseph A

AU - Ananthan, Subramaniam

AU - Piazza, Gary A

AU - White, E Lucile

AU - Harsay, Edina

PY - 2010/6/14

Y1 - 2010/6/14

N2 - Most of the components of the membrane and protein traffic machinery were discovered by perturbing their functions, either with bioactive compounds or by mutations. However, the mechanisms responsible for exocytic transport vesicle formation at the Golgi and endosomes are still largely unknown. Both the exocytic traffic routes and the signaling pathways that regulate these routes are highly complex and robust, so that defects can be overcome by alternate pathways or mechanisms. A classical yeast genetic screen designed to account for the robustness of the exocytic pathway identified a novel conserved gene, AVL9, which functions in late exocytic transport. We now describe a chemical-genetic version of the mutant screen, in which we performed a high-throughput phenotypic screen of a large compound library and identified novel smallmolecule secretory inhibitors. To maximize the number and diversity of our hits, the screen was performed in a pdr5Δ snq2Δ mutant background, which lacks two transporters responsible for pleiotropic drug resistance. However, we found that deletion of both transporters reduced the fitness of our screen strain, whereas the pdr5Δ mutation had a relatively small effect on growth and was also the more important transporter mutation for conferring sensitivity to our hits. In this and similar chemical-genetic yeast screens, using just a single pump mutation might be sufficient for increasing hit diversity while minimizing the physiological effects of transporter mutations.

AB - Most of the components of the membrane and protein traffic machinery were discovered by perturbing their functions, either with bioactive compounds or by mutations. However, the mechanisms responsible for exocytic transport vesicle formation at the Golgi and endosomes are still largely unknown. Both the exocytic traffic routes and the signaling pathways that regulate these routes are highly complex and robust, so that defects can be overcome by alternate pathways or mechanisms. A classical yeast genetic screen designed to account for the robustness of the exocytic pathway identified a novel conserved gene, AVL9, which functions in late exocytic transport. We now describe a chemical-genetic version of the mutant screen, in which we performed a high-throughput phenotypic screen of a large compound library and identified novel smallmolecule secretory inhibitors. To maximize the number and diversity of our hits, the screen was performed in a pdr5Δ snq2Δ mutant background, which lacks two transporters responsible for pleiotropic drug resistance. However, we found that deletion of both transporters reduced the fitness of our screen strain, whereas the pdr5Δ mutation had a relatively small effect on growth and was also the more important transporter mutation for conferring sensitivity to our hits. In this and similar chemical-genetic yeast screens, using just a single pump mutation might be sufficient for increasing hit diversity while minimizing the physiological effects of transporter mutations.

KW - Endosomes/metabolism

KW - Exocytosis/drug effects

KW - High-Throughput Screening Assays

KW - Saccharomyces cerevisiae/drug effects

KW - Saccharomyces cerevisiae Proteins/antagonists & inhibitors

KW - Signal Transduction

KW - Small Molecule Libraries/chemistry

U2 - 10.1002/cbic.200900681

DO - 10.1002/cbic.200900681

M3 - Journal article

C2 - 20461743

SN - 1439-4227

VL - 11

SP - 1291

EP - 1301

JO - ChemBioChem

JF - ChemBioChem

IS - 9

ER -