The broad, long-term objective of this research program is to develop general technology to conditionally regulate protein function at the level of the protein molecules rather than by targeting the DNA or mRNA precursors that encode a protein-of-interest. This technology is highly specific for the targeted protein and provides rapid and tunable control of protein function using cell-permeable small molecules or non-toxic light. The goal is to engineer small protein domains called destabilizing domains that are rapidly degraded when expressed in mammalian cells. The instability of destabilizing domains is faithfully conferred to other proteins fused to these small domains, allowing researchers to predictably control the levels of any protein-of-interest.
One specific aim of this research program will result in new destabilizing domains that are intrinsically fluorescent, allowing researchers to quantify protein levels using optical methods.
A second aim of this research is to produce destabilizing domains that are regulated by blue light rather than small molecules, thus enabling the control of protein stability with high spatial resolution.
A third aim of these studies will provide a family of destabilizing domains whose cellular levels can be raised by treatment with one ligand or whose cellular levels can be made to fall by treatment with a different ligand. In this case a single destabilizin domain could be used to test the effects of overexpression with one ligand or strong knock-down with a different ligand in an isogenic background.
The fourth aim of this research program is to produce destabilizing domains for use in Apicomplexan parasites such as Plasmodium falciparum and Toxoplasma gondii. A mechanistic understanding of how these domains are recognized and degraded in mammalian cells will make this technology more useful to users. These studies may also reveal general mechanisms that cells use to recognize and degrade unfolded or misfolded proteins, and these mechanisms are likely relevant to human diseases.

Public Health Relevance

The goal of this research program is to develop novel methods to rapidly and reversibly regulate the stability of specific proteins in eukaryotic cells ad living mammals. This methodology will enable the development of many new models for human diseases, and these model systems are enormously helpful in the ongoing search for new and improved drugs to treat human diseases.

Agency
National Institute of Health (NIH)
Type
Research Project (R01)
Project #
2R01GM073046-09
Application #
8814488
Study Section
Gene and Drug Delivery Systems Study Section (GDD)
Program Officer
Gerratana, Barbara
Project Start
Project End
Budget Start
Budget End
Support Year
9
Fiscal Year
2014
Total Cost
Indirect Cost
Name
Stanford University
Department
Biology
Type
Schools of Medicine
DUNS #
City
Stanford
State
CA
Country
United States
Zip Code
94304
Bonger, Kimberly M; Rakhit, Rishi; Payumo, Alexander Y et al. (2014) General method for regulating protein stability with light. ACS Chem Biol 9:111-5
Rakhit, Rishi; Navarro, Raul; Wandless, Thomas J (2014) Chemical biology strategies for posttranslational control of protein function. Chem Biol 21:1238-52
Sellmyer, Mark A; Bronsart, Laura; Imoto, Hiroshi et al. (2013) Visualizing cellular interactions with a generalized proximity reporter. Proc Natl Acad Sci U S A 110:8567-72
Cho, Ukrae; Zimmerman, Stephanie M; Chen, Ling-chun et al. (2013) Rapid and tunable control of protein stability in Caenorhabditis elegans using a small molecule. PLoS One 8:e72393
Leong, Hon S; Lizardo, Michael M; Ablack, Amber et al. (2012) Imaging the impact of chemically inducible proteins on cellular dynamics in vivo. PLoS One 7:e30177
Miyazaki, Yusuke; Imoto, Hiroshi; Chen, Ling-chun et al. (2012) Destabilizing domains derived from the human estrogen receptor. J Am Chem Soc 134:3942-5
Bonger, Kimberly M; Chen, Ling-chun; Liu, Corey W et al. (2011) Small-molecule displacement of a cryptic degron causes conditional protein degradation. Nat Chem Biol 7:531-7
Rakhit, Rishi; Edwards, Sarah R; Iwamoto, Mari et al. (2011) Evaluation of FKBP and DHFR based destabilizing domains in Saccharomyces cerevisiae. Bioorg Med Chem Lett 21:4965-8
Kwan, Matthew D; Sellmyer, Mark A; Quarto, Natalina et al. (2011) Chemical control of FGF-2 release for promoting calvarial healing with adipose stem cells. J Biol Chem 286:11307-13
Dvorin, Jeffrey D; Martyn, Derek C; Patel, Saurabh D et al. (2010) A plant-like kinase in Plasmodium falciparum regulates parasite egress from erythrocytes. Science 328:910-2

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