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1
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Localization and role of RAP55/LSM14 in HeLa cells: a new finding on the mitotic spindle assembly

100%
Mili D., Georgesse D., Kenani A.
|
2015
|
vol. 62
|
issue 3
613-619
EN
The MAP family includes large proteins like MAP-1A, MAP-1B, MAP-1C, MAP-2, and MAP-4 and smaller components like tau and MAP-2C. This article focuses on the relevant aspects of RAP55/LSM14 position with emphasis on its role in mitotic spindle formation and stability. In this context, the localization of RNA associated Protein 55kDa (RAP55/LSM14) during mitosis was identified as a Mitotic Spindle Protein (MSP). We found a new location obtained by expressing GFP-tagged proteins in HeLa Cells during mitosis that has never been previously reported. We demonstrated also, for the first time, that the depletion of RAP55/LSM14 destabilizes spindle assembly, stops cells in mitosis and induces many other cell cytoskeletal disorders. Finally, by using an "in vitro" assay investigation, we found that RAP55/LSM14 binds directly the tubulin and that is implicated in the process of the mitotic spindle stabilization, which is a novel discovery in this field of research.
2
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Directionality of kinesin motors.

84%
Kasprzak A. A., Hajdo Ł.
|
2002
|
vol. 49
|
issue 4
813-821
EN
Kinesins are molecular motors that transport various cargoes along microtubule tracks using energy derived from ATP hydrolysis. Although the motor domains of kinesins are structurally similar, the family contains members that move on microtubules in opposite directions. Recent biochemical and biophysical studies of several kinesins make it possible to identify structural elements responsible for the different directionality, suggesting that reversal of the motor movement can be achieved through small, local changes in the protein structure.
3
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Rola białek motorycznych w transporcie aksonalnym

67%
Kasprzak A.
Kosmos
|
2018
|
vol. 67
|
issue 1
109-119
PL
Transport wzdłuż mikrotubul aksonu i dendrytów jest niezbędny nie tylko dla zachowania ogólnej struktury i funkcjonowania komórki nerwowej, ale również całego układu nerwowego. W aksonie transport odbywa się dwukierunkowo, wzdłuż jednorodnie zorientowanych mikrotubul. Transport od ciała komórki w kierunku synapsy wymaga aktywności kinezyn i umożliwia dostarczanie białek (enzymów, cząsteczek sygnałowych, neurofilamentów, motorów molekularnych), pęcherzyków lipidowych i organelli, takich jak mitochondria do dystalnej części aksonu. Za transport w przeciwnym kierunku odpowiada dyneina cytoplazmatyczna, która przenosi zużyte lub niepoprawnie sfałdowane białka oraz cząsteczki sygnałowe do ciała komórki. W niniejszej pracy opisujemy elementy neuronu, które biorą udział transporcie aksonalnym oraz mechanizmy transportu. Przedstawiamy również czynniki, od których zależy transport aksonalny, włączając w to obecność białek adaptorowych (Milton/TRAK), białek MAP (białka związane z mikrotubulami) oraz modyfikacji potranslacyjnych tubuliny.
EN
Axonal transport is essential for maintaining the overall architecture of the brain and the entire nervous system. In the axon, the bidirectional transport takes place along uniformly oriented microtubules. Anterograde axonal transport is performed by kinesins and its function is to supply nerve terminals with proteins (enzymes, signaling molecules, filaments, motors), lipid vesicles and organelles like mitochondria for local energy requirements. Retrograde transport carried out by dyneins clears recycled or misfolded proteins but also it transmits trophic signals to the cell body. Here, we describe various components and mechanisms of axonal transport and we outline the factors that have been proposed to contribute to the cargo movement such as the use of adaptor proteins, the effect of MAPs (microtubule associated proteins) and the role of posttranslational modifications of tubulin.
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