Our lab is interested in understanding the fundamentals of centrosome biogenesis.
We aim to uncovering the mechanisms that control the centriole duplication and centrosome maturation cycles. Through our own genome-wide RNAi screen and from other published screens, we now have a large number of candidate genes that play critical roles in these two cycles. What is lacking in the field is a true understanding of these proteins functions. In the past year we have completed a yeast-2-hybrid screen to identify the interactions between 94 centrosome proteins. We have completed the detailed analysis of 22 centrosome proteins and have identified 219 novel interactions. In addition to these core proteins, we have interaction data on 72 others. We are now focusing on understanding several critical centrosome proteins in extreme detail. One such protein is called Asterless, which is thought to be a protein scaffold at the centrosome. Our interactome has identified many Asterless binding partners, of which we are investigating three: Cep97, CP309 and Plk4. Each of these interactions is required for a unique stage within the centrosome life cycle.

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National Heart, Lung, and Blood Institute
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Galletta, Brian J; Jacobs, Katherine C; Fagerstrom, Carey J et al. (2016) Asterless is required for centriole length control and sperm development. J Cell Biol 213:435-50
Galletta, Brian J; Fagerstrom, Carey J; Schoborg, Todd A et al. (2016) A centrosome interactome provides insight into organelle assembly and reveals a non-duplication role for Plk4. Nat Commun 7:12476
Klebba, Joseph E; Galletta, Brian J; Nye, Jonathan et al. (2015) Two Polo-like kinase 4 binding domains in Asterless perform distinct roles in regulating kinase stability. J Cell Biol 208:401-14
Klebba, Joseph E; Buster, Daniel W; McLamarrah, Tiffany A et al. (2015) Autoinhibition and relief mechanism for Polo-like kinase 4. Proc Natl Acad Sci U S A 112:E657-66
Galletta, Brian J; Rusan, Nasser M (2015) A yeast two-hybrid approach for probing protein-protein interactions at the centrosome. Methods Cell Biol 129:251-77
Plevock, Karen M; Galletta, Brian J; Slep, Kevin C et al. (2015) Newly Characterized Region of CP190 Associates with Microtubules and Mediates Proper Spindle Morphology in Drosophila Stem Cells. PLoS One 10:e0144174
Galletta, Brian J; Guillen, Rodrigo X; Fagerstrom, Carey J et al. (2014) Drosophila pericentrin requires interaction with calmodulin for its function at centrosomes and neuronal basal bodies but not at sperm basal bodies. Mol Biol Cell 25:2682-94
Klebba, Joseph E; Buster, Daniel W; Nguyen, Annie L et al. (2013) Polo-like kinase 4 autodestructs by generating its Slimb-binding phosphodegron. Curr Biol 23:2255-61