Objective
ABSTRACT An important function of the cell is the lysosomal degradation of proteins that are coming from within the cell or from the extra cellular environment. This function requires proteolytic enzymes that are present in the lysosomes. Upon synthesis, carbohydrate moieties (including mannose 6-phosphate) are attached to these enzymes, followed by a targeting step involving the intracellular transport from the trans-Golgi network to the lysosome. This transport step is mediated by the mannose 6-phosphate receptor (MPR). Immunofluorescence microscopy has suggested that the intermediate transport elements that carry the MPR/enzyme complex from the trans-Golgi network to an endosomal compartment may consist of tubules.
My aim is to determine whether the MPR is indeed transported in tubules (rather than vesicles) using a recently developed correlative live-cell imaging and electron microscopy technique which capitalizes the advantages of both forms of microscopy: protein movement and morphological analysis at the ultra-structural level. Moreover, the transport elements will be further characterized by immuno-labelling them for proteins that are of particular interest, such as adaptor proteins and molecular motor proteins. For the proteins that will be found on the tubules their role in transport element dynamics will be analysed in further detail by interference studies.
Using the same correlative technique together with markers specific for the distinct endosomal compartments, the endosomal compartment with which t he transport elements fuse will be identified. Identification and characterization of the MPR containing transport elements using the correlative technique will unequivocally increase our insight in the cell's capability to move membrane proteins around in a highly structural and organized way without disturbing the identity and integrity of the different organelles.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences optics microscopy electron microscopy
- natural sciences biological sciences biochemistry biomolecules carbohydrates
- natural sciences biological sciences biochemistry biomolecules proteins enzymes
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP6-2002-MOBILITY-5
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
UTRECHT
Netherlands
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.