There are a great number of plasma membrane proteins that enter cells by clathrin-independent endocytosis and we have begun to study these proteins in detail in an attempt to understand how they travel in cells and whether they specifically interact with cellular machinery. We have identified signals in the cytoplasmic tails of CD44, CD98 and CD147 that are responsible for their altered trafficking and are looking for cellular machinery that is responsible for recognition and sorting of these signals. Understanding how these proteins move into and out of cells is important because these proteins are involved in interaction with the extracellular matrix (CD44), are involved in nutrient transport (CD98) and interact with integrins and matrix metalloproteinases (CD147).

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National Heart, Lung, and Blood Institute
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Mathew, Mohit P; Donaldson, Julie G (2018) Distinct cargo-specific response landscapes underpin the complex and nuanced role of galectin-glycan interactions in clathrin-independent endocytosis. J Biol Chem 293:7222-7237
Stepicheva, Nadezda A; Dumas, Megan; Kobi, Priscilla et al. (2017) The small GTPase Arf6 regulates sea urchin morphogenesis. Differentiation 95:31-43
Liu, Xiong; Shu, Shi; Billington, Neil et al. (2016) Mammalian Nonmuscle Myosin II Binds to Anionic Phospholipids with Concomitant Dissociation of the Regulatory Light Chain. J Biol Chem 291:24828-24837
Donaldson, Julie G; Johnson, Debra L; Dutta, Dipannita (2016) Rab and Arf G Proteins in Endosomal Trafficking & Cell Surface Homeostasis. Small GTPases :0
Dutta, Dipannita; Donaldson, Julie G (2015) Rab and Arf G proteins in endosomal trafficking. Methods Cell Biol 130:127-38
Dutta, Dipannita; Donaldson, Julie G (2015) Sorting of Clathrin-Independent Cargo Proteins Depends on Rab35 Delivered by Clathrin-Mediated Endocytosis. Traffic 16:994-1009
Mayor, Satyajit; Parton, Robert G; Donaldson, Julie G (2014) Clathrin-independent pathways of endocytosis. Cold Spring Harb Perspect Biol 6:
Maldonado-Báez, Lymarie; Donaldson, Julie G (2013) Hook1, microtubules, and Rab22: mediators of selective sorting of clathrin-independent endocytic cargo proteins on endosomes. Bioarchitecture 3:141-6
Cole, Nelson B; Donaldson, Julie G (2012) Releasable SNAP-tag probes for studying endocytosis and recycling. ACS Chem Biol 7:464-9
Dutta, Dipannita; Williamson, Chad D; Cole, Nelson B et al. (2012) Pitstop 2 is a potent inhibitor of clathrin-independent endocytosis. PLoS One 7:e45799

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