Growth factors: Difference between revisions
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The <scene name='80/801744/Cv/4'>kinase domain of M-CSF receptor interacts with a drug-designed inhibitor</scene> via the conserved kinase DFG motif (colored in salmon) and its gatekeeper threonine residue (colored in magenta)<ref>PMID:23493555</ref>. | The <scene name='80/801744/Cv/4'>kinase domain of M-CSF receptor interacts with a drug-designed inhibitor</scene> via the conserved kinase DFG motif (colored in salmon) and its gatekeeper threonine residue (colored in magenta)<ref>PMID:23493555</ref>. | ||
*[[Epidermal growth factor]] and [[Epidermal Growth Factor Receptor]] | *[[Epidermal growth factor]] and [[Epidermal Growth Factor Receptor]] | ||
[[Lapatinib]] is a EGFR inhibitor used in breast cancer treatment. EGFRs are overexpressed in many types of human carcinomas including lung, pancreatic, and breast cancer, and are often mutated. This overexpression leads to excessive activation of the anti-apoptotic [[Ras]] signaling cascade, resulting in uncontrolled [[DNA_Replication|DNA synthesis]] and cell proliferation. The <scene name='Lapatinib/Egfr/1'>EGFR tyrosine kinase domain</scene> is responsible for activating this Ras signaling cascade. Upon binding ligands like Epidermal Growth Factor, EGFR dimerizes and autophosphorylates several tyrosine residues at its C-terminal domain. Upon phosphorylation, EGFR undergoes a significant conformational shift, revealing an additional binding site capable of binding and activating downstream signaling proteins. | |||
[[Gefitinib]] inhibits the EGFR by <scene name='Gefitinib/Bound/1'>binding to the ATP-binding site</scene> located within the kinase domain. Residues Lys745, Leu788, Ala743, Thr790, Gln791, Met193, Pro794, Gly796, Asp800, Ser719, Glu762, & Met766 tightly bind the inhibitor. Unable to bind ATP, EGFR is incapable of autophosphorylating its C-terminal tyrosines, and the uncontrolled cell-proliferation signal is terminated. | |||
[[Erlotinib]] inhibits the EGFR by <scene name='Erlotinib/Bound/1'>binding to the ATP-binding site</scene> located within the kinase domain. EGFR uses residues Asp831, Lys721, Thr766, Leu820, Gly772, Phe771, Leu694, Pro770, Met769, Leu768, Gln767 & Ala719 to tightly bind the inhibitor. Unable to bind ATP, EGFR is incapable of autophosphorylating its C-terminal tyrosines, and the uncontrolled cell-proliferation signal is terminated. | |||
See also [[Herceptin - Mechanism of Action]] | |||
*[[Ephrin]] and [[Ephrin receptor]] | *[[Ephrin]] and [[Ephrin receptor]] | ||
*[[Erythropoietin]] and [[Erythropoietin receptor]] | *[[Erythropoietin]] and [[Erythropoietin receptor]] | ||