Centrosomes organize the bipolar mitotic spindle, which is essential for chromosome segregation, and defects in centrosomes lead to chromosomal instability and cancer in humans. The yeast centrosome (Spindle Pole Body, SPB) shares many components and regulators with human centrosomes. Phosphorylation by Cyclin- dependent kinase and Mpsl kinase is essential for both centrosome and SPB assembly and activity. In this project in the PPG, we will determine structural features and phosphorylation events in core SPB components that play significant roles in their assembly, function and exchange. To ascertain important functional domains and residues, we will generate a library of mutations in SPB components based on two significant informational resources: the first is structural data from Ivan Rayment (Project 3) on full-length SPB components or particular domains. The second is phosphorylation sites mapped in vivo in our yeast SPB phosphoproteome. Mutated SPB proteins will be tested for their competence in assembly into new SPBs at duplication and into existing SPBs during mitosis when SPBs expand (mimicking centrosome maturation). They will also be evaluated for compromised interactions with other SPB components and for structural perturbations as assayed by electron microscopy and electron tomography. Candidate protein kinases, phosphatases and other regulators will be screened for function with particular SPB components. It is anticipated that this work will expand the collection of SPB regulatory molecules. Finally, despite evidence that components exchange in and out of SPBs during the cell cycle, little is known about the mechanism of homeostasis. We will first determine the extent of SPB size dynamics and component exchange in wild-type cells, using electron tomography and Fluorescent Recovery After Photobleaching (FRAP). We will then use our mutant collection to assess the contribution of particular features of individual SPB components to their exchange and attempt to identify trans-acting regulators.
This third aim will involve working closely with Davis (Project 2) on similar issues of SPB dynamics and remodeling. Overall, we will provide an in vivo analysis of SPB components, bringing to bear our strengths in electron microscopy and tomography to the PPG. We will contribute substantial in vivo analyses to test hypotheses of SPB component behavior derived from structural studies and molecular modeling. Several of the SPB components and regulators have human orthologs and studies in yeast will be critical to understanding their assembly and function in the pericentriolar material (PCM) of centrosomes.
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|Viswanath, Shruthi; Bonomi, Massimiliano; Kim, Seung Joong et al. (2017) The molecular architecture of the yeast spindle pole body core determined by Bayesian integrative modeling. Mol Biol Cell 28:3298-3314|
|Asbury, Charles L (2017) Anaphase A: Disassembling Microtubules Move Chromosomes toward Spindle Poles. Biology (Basel) 6:|
|Deng, Yi; Asbury, Charles L (2017) Simultaneous Manipulation and Super-Resolution Fluorescence Imaging of Individual Kinetochores Coupled to Microtubule Tips. Methods Mol Biol 1486:437-467|
|Fong, Kimberly K; Sarangapani, Krishna K; Yusko, Erik C et al. (2017) Direct measurement of the strength of microtubule attachment to yeast centrosomes. Mol Biol Cell 28:1853-1861|
|Burke, Russell T; Marcus, Joshua M; Orth, James D (2017) Inhibition of exportin-1 function results in rapid cell cycle-associated DNA damage in cancer cells. Oncotarget 8:39460-39475|
|Kudalkar, Emily M; Deng, Yi; Davis, Trisha N et al. (2016) Coverslip Cleaning and Functionalization for Total Internal Reflection Fluorescence Microscopy. Cold Spring Harb Protoc 2016:pdb.prot085548|
|Lee, Jason E; Westrate, Laura M; Wu, Haoxi et al. (2016) Multiple dynamin family members collaborate to drive mitochondrial division. Nature 540:139-143|
|Kudalkar, Emily M; Davis, Trisha N; Asbury, Charles L (2016) Single-Molecule Total Internal Reflection Fluorescence Microscopy. Cold Spring Harb Protoc 2016:pdb.top077800|
|Asbury, Charles L (2016) Data Analysis for Total Internal Reflection Fluorescence Microscopy. Cold Spring Harb Protoc 2016:pdb.prot085571|
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