Protein involved in the intracellular transport of proteins from one location to another. All proteins (except the ones synthesized in mitochondria and plastids) are synthesized on ribosomes in the cytosol. Most proteins remain in the cytosol. Proteins with a signal sequence either become plasma membrane components or are exported from the cell of origin.
Protein involved in the transport of a molecule (metabolite, protein, etc), a ion or an electron across cell membranes, inside the cell or in a tissue fluid.
A reference proteome is a set of protein sequences derived from a complete proteome which constitutes a defined standard for a particular user community. Reference proteomes are manually defined according to a number of criteria. They cover the proteomes of well- studied model organisms and other proteomes of interest for biomedical and biotechnological research. Reference proteomes have been selected to provide broad coverage of the tree of life, and constitute a representative cross-section of the taxonomic diversity to be found within UniProtKB.
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