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dc.contributor.authorSeamster, Pamela E.
dc.contributor.authorLoewenberg, Michael
dc.contributor.authorPascal, Jennifer
dc.contributor.authorChauviere, Arnaud
dc.contributor.authorGonzales, Aaron
dc.contributor.authorCristini, Vittorio
dc.contributor.authorBearer, Elaine L.
dc.date.accessioned2012-11-09T17:16:05Z
dc.date.available2014-10-22T08:57:23Z
dc.date.issued2012-09-25
dc.identifier.citationPhysical Biology 9 (2012): 055005en_US
dc.identifier.urihttp://hdl.handle.net/1912/5541
dc.descriptionAuthor Posting. © IOP Publishing, 2012. This article is posted here by permission of IOP Publishing for personal use, not for redistribution. The definitive version was published in Physical Biology 9 (2012): 055005, doi:10.1088/1478-3975/9/5/055005.en_US
dc.description.abstractThe kinesins have long been known to drive microtubule-based transport of sub-cellular components, yet the mechanisms of their attachment to cargo remain a mystery. Several different cargo-receptors have been proposed based on their in vitro binding affinities to kinesin-1. Only two of these—phosphatidyl inositol, a negatively charged lipid, and the carboxyl terminus of the amyloid precursor protein (APP-C), a trans-membrane protein—have been reported to mediate motility in living systems. A major question is how these many different cargo, receptors and motors interact to produce the complex choreography of vesicular transport within living cells. Here we describe an experimental assay that identifies cargo–motor receptors by their ability to recruit active motors and drive transport of exogenous cargo towards the synapse in living axons. Cargo is engineered by derivatizing the surface of polystyrene fluorescent nanospheres (100 nm diameter) with charged residues or with synthetic peptides derived from candidate motor receptor proteins, all designed to display a terminal COOH group. After injection into the squid giant axon, particle movements are imaged by laser-scanning confocal time-lapse microscopy. In this report we compare the motility of negatively charged beads with APP-C beads in the presence of glycine-conjugated non-motile beads using new strategies to measure bead movements. The ensuing quantitative analysis of time-lapse digital sequences reveals detailed information about bead movements: instantaneous and maximum velocities, run lengths, pause frequencies and pause durations. These measurements provide parameters for a mathematical model that predicts the spatiotemporal evolution of distribution of the two different types of bead cargo in the axon. The results reveal that negatively charged beads differ from APP-C beads in velocity and dispersion, and predict that at long time points APP-C will achieve greater progress towards the presynaptic terminal. The significance of this data and accompanying model pertains to the role transport plays in neuronal function, connectivity, and survival, and has implications in the pathogenesis of neurological disorders, such as Alzheimer's, Huntington and Parkinson's diseases.en_US
dc.description.sponsorshipThis work was supported in part by NINDS RO1 NS046810 and RO1 NS062184 (ELB), NIGMS RO1 GM47368 (ELB), the Physical Sciences in Oncology Center grant U54CA143837 (VC), NIGMS K12GM088021 (JP), and NSF IGERT DGE-0549500 (PES). ELB and VC also received pilot project funds from the UNM Center for Spatiotemporal modeling, funded by NIGMS, P50GM08273, which also supported AC.en_US
dc.format.mimetypeapplication/pdf
dc.format.mimetypevideo/quicktime
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.urihttps://doi.org/10.1088/1478-3975/9/5/055005
dc.titleQuantitative measurements and modeling of cargo–motor interactions during fast transport in the living axonen_US
dc.typeArticleen_US
dc.description.embargo2013-09-25en_US
dc.identifier.doi10.1088/1478-3975/9/5/055005


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