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Numerous receptors have intrinsic or tightly related enzyme activity. On the required of ligand to their extracellular face like receptors undergo a conformational change and activate an enzyme activity. In case of the insulin receptor that is a complex of two α- and two β-subunits held together through disulfide bonds the polypeptide hormone insulin the ligand binds to the extracellular face of the α-subunits. The receptor then undergoes a conformational modify leading to the autophosphorylation of the cytosolic domain of the β-subunit. By the specifically hydroxyl groups in the side chains of certain tyrosine residues are phosphorylated with ATP being the phosphate donor. Phosphorylated receptor is then identify by other proteins in the cytosol which in turn modulate various intracellular events permitting the cell to respond to the hormone appropriately. Additionally, β-subunit can straight phosphorylate other goal proteins within the cell.
figure: Signal transduction through an enzyme-linked receptor such as the insulin receptor.
In a possible future scenario, male fertility drops to zero, but, luckily, scientists develop a way for women to produce babies by virgin birth. Meiocytes are converted directly (w
Q. Why does the urinary volume increase when alcoholic beverages are ingested? Alcohol inhibits the ADH (antidiuretic hormone) secretion by the hypophysis and Low ADH reduces t
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What is the compound that is phosphorylated for ATP formation? What is the resulting compound when ATP liberates energy? ATP, or adenosine triphosphate, is produced after the
STRUCTUR E - B R A I N
How age factors affect the requirement of protein? Age: Protein in excess of maintenance needs is required, when a new tissue is being fornled. Certain age periods, when growth
Iron deficiency should be treated with supplemental iron. • Osteoporosis should be treated with calcium and vitamin D supplements. • Depending on individual factors, patien
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