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The size of lysosomes varies from 0.1 μm to 1.2 μm. [24] With a pH ranging from ~4.5–5.0, the interior of the lysosomes is acidic compared to the slightly basic cytosol (pH 7.2). The lysosomal membrane protects the cytosol, and therefore the rest of the cell, from the degradative enzymes within the lysosome.
The mutation increases the amount of Ca2+ flow through TPC2 by NAADP evoked signals. This increase in signaling leads to an increase in size of the lysosomes due to the increased rate and amount of fusion. The lysosome, therefore, is not able to break down components the way it should. This inability is associated with the onset of the disease.
Fusion of late endosomes with lysosomes has been shown to result in the formation of a 'hybrid' compartment, with characteristics intermediate of the two source compartments. [8] For example, lysosomes are more dense than late endosomes, and the hybrids have an intermediate density. Lysosomes reform by recondensation to their normal, higher ...
Lysosomes carry out intracellular digestion, in a process called phagocytosis (from the Greek phagein, to eat and kytos, vessel, referring here to the cell), by fusing with a vacuole and releasing their enzymes into the vacuole. Through this process, sugars, amino acids, and other monomers pass into the cytosol and become nutrients for the cell.
Cell culture is one of the major tools used in cellular and molecular biology, providing excellent model systems for studying the normal physiology and biochemistry of cells (e.g., metabolic studies, aging), the effects of drugs and toxic compounds on the cells, and mutagenesis and carcinogenesis.
The process of phagocytosis showing phagolysosome formation. Lysosome(shown in green) fuses with phagosome to form a phagolysosome. Membrane fusion of the phagosome and lysosome is regulated by the Rab5 protein, [1] a G protein that allows the exchange of material between these two organelles but prevents complete fusion of their membranes. [1]
The autophagic process is divided into five distinct stages: Initiation, phagophore nucleation, autophagosomal formation (elongation), autophagosome-lysosome fusion (autophagolysosome) and cargo degradation. [1] An autophagosome is a spherical structure with double layer membranes. [2]
The gene for LAMP2 has 9 coding exons and 2 alternate last exons, 9a and 9b. [6] When the last exon is spliced with the alternative exon, it is a variant called LAMP2b, which varies in the last 11 amino acids of its C-terminal sequence: in the luminal domain, the transmembrane domain, and the cytoplasmic tail.
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