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VPS35 binds with other proteins to form the retromer, an evolutionarily conserved complex that plays a major role in transmembrane protein recycling from endosomes to the trans-Golgi network . [1] [6] [7] [8] VPS35 itself folds into a secondary structure that represents an α-helical solenoid, containing 34 α-helix repeats. [16]
The Golgi apparatus (/ ˈ ɡ ɒ l dʒ i /), also known as the Golgi complex, Golgi body, or simply the Golgi, is an organelle found in most eukaryotic cells. [1] Part of the endomembrane system in the cytoplasm , it packages proteins into membrane-bound vesicles inside the cell before the vesicles are sent to their destination.
The trans-Golgi network is responsible for adding sialic acid (NANA) and sorting proteins into vesicles destined for lysosomes or secretion. [7] These specialized modifications and sorting are crucial for protein functionality and their subsequent cellular destinations.
As a sorting receptor on the cell surface and on the endoplasmic reticulum-Golgi apparatus within the cell, sortilin is involved in the transport of a wide variety of intracellular proteins between the trans-Golgi network, endosome, lysosome, and secretory granules, as well as the plasma membrane. [8]
Retromer is a complex of proteins that has been shown to be important in recycling transmembrane receptors from endosomes to the trans-Golgi network (TGN) and directly back to the plasma membrane. Mutations in retromer and its associated proteins have been linked to Alzheimer's and Parkinson's diseases. [1] [2] [3] [4]
The protein encoded by this gene may control steps in the cycling of proteins through the trans-Golgi network to endosomes, lysosomes and the plasma membrane. Mutations in this gene cause the autosomal recessive disorder, chorea acanthocytosis. Alternative splicing of this gene results in multiple transcript variants. [7]
The SNX8 is a sorting nexin protein involved in intracellular molecular traffic from the early endosomes to the trans-golgi network. It is suggested that it acts as an adaptor protein in events related to immune response and cholesterol regulation, for example.
Proteins produced from the VPS13B gene are part of the Golgi apparatus. [13] They are also responsible for sorting and transporting of proteins inside of the cell. [13] The VPS13B protein is important because it plays an important role in the function of normal growth, the development of neurons, and the development of adipocytes. [13]