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PFK belongs to the phosphofructokinase B (PfkB) family of sugar kinases. [7] Other members of this family (also known as the Ribokinase family) include ribokinase (RK), adenosine kinase (AK), inosine kinase, and 1-phosphofructokinase. [7] [8] [9] The members of the PfkB/RK family are identified by the presence of three conserved sequence motifs.
Phosphofructokinase-1 (PFK-1) is one of the most important regulatory enzymes (EC 2.7.1.11) of glycolysis. It is an allosteric enzyme made of 4 subunits and controlled by many activators and inhibitors .
The pathway is antagonized by various factors including PTEN, [7] GSK3B, [2] and HB9. [5] In many cancers, this pathway is overactive, thus reducing apoptosis and allowing proliferation. This pathway is necessary, however, to promote growth and proliferation over differentiation of adult stem cells, neural stem cells specifically. [2]
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Protein targeting or protein sorting is the biological mechanism by which proteins are transported to their appropriate destinations within or outside the cell. [1] [2] [note 1] Proteins can be targeted to the inner space of an organelle, different intracellular membranes, the plasma membrane, or to the exterior of the cell via secretion.
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The Hedgehog signaling pathway is one of the key regulators of animal development and is present in all bilaterians. [3] The pathway takes its name from its polypeptide ligand, an intracellular signaling molecule called Hedgehog (Hh) found in fruit flies of the genus Drosophila; fruit fly larvae lacking the Hh gene are said to resemble hedgehogs.