Receptor Tyrosine Kinase

Documents about Receptor Tyrosine Kinase

	Lecture 26 Signal Transduction Cincinnati, BIOL 301 Excerpt: ... Lecture 25 Cell-cell signals Hydrophobic signals Hydrophilic signals Phosphorylation cascades GTP switch proteins G protein linked receptors Receptor tyrosine kinase s Main Points The chemical nature of the signal determines where the receptors are located in the cell G protein linked receptors work through second messengers Enzyme linked receptors activate downstream proteins by serving as docking sites, change activity of protein once it binds Cell-Cell Signaling using Soluble Molecules Each specific molecule must have a specific receptor in the target cell, allowing it to respond to the signal Nature of the signal molecule dictates type of receptor needed Steroid (and other hydrophobic) hormones use cytoplasmic or nuclear receptors Peptide (and other hydrophilic) hormones require cell surface receptors Steroid Hormone Action Moderately slow acting, hours to days Routes for Transmitting Extracellular Signals via Surface Receptors G protein linked rec ...
	Lecture10 UNC, BIOL 205 Excerpt: ... undergoes a conformational change upon binding to Ca+2 Activation of CaM-kinase 3 classes of cell surface receptors Enzyme-linked receptors 3 classes: receptor tyrosine kinase s, cytokine receptors, TGF- receptors Transmembrane proteins - single alpha-helix Ligand-binding domain on extracellular side Cytoplasmic side acts as an enzyme or forms a complex with another protein that acts as an enzyme Slower responses than GPCRs Activation usually alters gene expression 1. Receptor tyrosine kinase s Ligands are soluble or membrane-bound peptide or protein hormones (I.e. insulin, growth factors) Some RTKs have been identified in studies of human cancers - mutant forms send proliferative signals to cells in absence of signal Receptor tyrosine kinase s dimerize upon ligand binding and autophosporylate themselves Phosphorylate tyrosine residues on target proteins and on themselves Activation of a receptor tyrosine kinase stimulates assembly of a signaling complex Tyrosine receptor signa ...
	Exam22001key Arizona, MCB 410 Excerpt: ... MCB 410 Spring 2001 Page 1 of 3 MCB 410 SPRING 2001 KEY Second hour exam. March 30, 2001 AVERAGE = 64.3 SCORE DISTRIBUTION 1. (6 pts) Antibodies have two antigen binding sites. Treatment of cells in culture with an antibody that binds to a specific type of receptor tyrosine kinase (RTK) can sometimes activate the RTK. In contrast, the same treatment with an antibody that binds to a specific type of a G-protein coupled receptor (GPCR) almost never causes activation of the GPCR. Explain in a few sentences why the RTK is activated by the antibody and the GPCR is not. ENZYME LINKED RECEPTORS ARE ACTIVATED BY DIMERIZATION WHILE GPCRS ARE ACTIVATED BY SPECIFIC LIGAND INTERACTIONS. IT IS EASIER FOR ANTIBODIES TO CAUSE DIMERIZATION THAN TO MIMIC A SPECIFIC INTERACTION WITH GPCRS 2. (8 pts) You have just cloned a new GEF protein. Looking at its sequence you find a domain that suggests a way in which the GEF might be activated. What is the most likely mechanism of activation of your GEF if that domain were: A.) an SH ...
	RTK_Handout_2009 Arizona, BIOC 462 Excerpt: ... Lecture notes for Bioc462b lecture 9 - Signal Transduction: Receptor Tyrosine Kinase s Feb 4, 2009 Learning Objectives Describe the roles hormones play in regulating metabolic pathways in terms of changes in flux and coordination of multiple metabolic pathways. Discuss the features shared by all signaling systems. Explain the mechanism by which insulin receptor becomes activated. Compare the changes exerted by insulin on glycolysis, glycogen synthesis, and gluconeogenesis. Identify the three major nodes in insulin signaling network. Discuss how each is activated and inactivated. Practice homework problems: #6 and #9 (at the end of chapter 12) Metabolic pathways are roadmaps. They are not directions. Enzyme activities and substrate availability determine the directions of pathways. The speed by which the substrates, intermediates, and products are consumed or generated determine how fast individual pathways operate (flux). Hormones ultimately dictate the direction of metabolic pathways (for exampl ...
	BIPN140 trophic factors UCSD, BIPN 140 Excerpt: ... rst trophic factor, Nerve Growth Factor (NGF), for which they received the Nobel Prize. There are three NGFrelated trophic factors: BDNF, NT3, and NT4, which regulate survival of various neuronal populations. The Trk proteins act as receptors for NGF and related factors. Trk is a receptor tyrosine kinase . Trk dimerization and phosphorylation leads to activation of various intracellular signaling pathways including the MAP kinase, Akt, and PKC pathways. CNTF: Ciliary neurotrophic factor is another protein that acts as a survival factor for motor neurons. CNTF acts via a receptor complex that includes CNTFR, GP130, and LIFR. Activation of the receptor leads to phosphorylation and recruitment of the JAK kinase, which in turn phosphorylates LIFR. LIFR acts as a docking site for the STAT transcription factors. JAK kinase phosphorylates STAT proteins, which dissociate from the receptor and translocate to the nucleus to regulate gene expression. GDNF: Glial derived neurotrophic factor is a member of the TGFb ...
	Lectures 2-3 Chapter 11 Book Notes (Pg. 201-215) Vanderbilt, BSCI 110b Excerpt: ... ceptors: G-protein-linked receptors Receptor tyrosine kinase s Ion channel receptors STUDY (Page 206) FIGURE 11.7 ON PAGES 206-208! Biology 110B Chapter 11 Book Notes A G-protein-linked receptor is a plasma membrane receptor that works with the help of a protein called a G protein. Yeast mating factors use this as well as adreneline and neurotransmitters. Each g-protein-linked receptor has seven transmembrane helices spanning the membrane. Specific loops between the helices form binding sites for signal and Gprotein molecules. Both vision and smell in humans depend on these proteins. These systems are also involved in many human diseases, like bacterial infections (chloera, pertussis (whooping cough), and botulism) where the bacteria produce toxins that interfere with G-protein function. Many medicines also influence G-protein pathways. When GTP is bound, the G protein is active, but when GDP is bound, it is inactive. Steps for a G-protein-linked receptor: 1. The appropriate signal molecule binds to the e ...
	StudyGuideExam3 Allegheny, BIO 221 Excerpt: ... Bio 221: Study Guide for Exam 3 General approach: Review your lecture notes and the PowerPoint slides for Exam 3, and use the text and supplemental readings to reinforce what youve learned and clear up any questions you may have. Review the material ...
	Practice exam 2 Harvard, MCB 54 Excerpt: ... xamination of the muscle cells in these mice shows that a large number of vesicles accumulate just below the plasma membrane. Further investigation shows that laser-induced holes in the plasma membrane lead to cell death in the case of dysferlindeficient cells, while cells isolated from normal mice are able to survive this type of damage. Explain these observations, making specific reference to the possible mechanism of survival in the case of wild type mouse cells and the potential function of the dysferlin protein. Name _ TF_ 5 7. (25 pts) The EGF-Receptor family of receptor tyrosine kinase s is comprised of four receptors that show closely related sequence similarity and affinity for similar ligands. MDA-MB-361cells are known to express EGFR, ErbB2, and ErbB3 receptors. You decide to investigate the differences in downstream signaling events depending upon the ligand used for stimulation. After stimulating this cell line with either ...
	Bios_41_Lecture_24 Lehigh, BIOS 41 Excerpt: ... Chapter 16: Cell Communication Lecture 24 (pages 544-567) March 24, 2008 Jennifer Venditti Classes of cell surface receptors G-protein-linked receptors transduce signals through activation of G-protein subunits All G-protein-linked receptors share a similar structure. G-proteins are composed of 3 protein subunits. Activation of a G-protein The G-protein alpha subunit functions as an intrinsic GTPase G-proteins can activate ion channels. G-proteins can activate enzymes directly. Animation 16.2 G-protein signaling cAMP has many effects within the cell. A G-protein activates adenylyl cyclase Animation 16.3 cAMP Signaling Phospholipase C activates two signaling pathways in the cell. Ca2+ signaling is important for many biological processes in the cell. Animation 16.4 Inositol Phosphate Signaling Enzyme-linked receptors transduce signals upon activation of the enzyme by a signal. Enzyme linked receptor: Receptor Tyrosine Kinase Receptor Tyro ...
	W7OutlineLec19 UC Irvine, BIOL D103 Excerpt: ... Luis David Gomez 59866865 Bio 192 D103 Cell Biology Week 7 Lecture 19 Outline 2/22/08 Enzyme Linked Coupled Receptors Receptor Transduction signaling proteins TGFb-family receptors Smads Cytokine receptors JAK's / STAT's Receptor tyrosine kinase s Ras / MAP kinase Receptors generally. have INTRINSIC enzyme activity OR another protein will bind to the receptor that will give kinase/phosphotase activity monomeric or dimerized forms Receptor Activation -ligand binds and subunits are activated Monomeric ligands can be concentrated locally by extracellular matrix proteins. Receptors are brought into close association by binding to ligand. Clustering of receptors can also be induced by localized expression of monomeric ligand on the signaling cell. (lipid rafts) Specific Signaling Pathways Receptor Transducing signaling proteins TGFbSmads family receptors Cytokines Janus Kinases /STATs Outcome/Details Receptor Tyrosine Kinase Ras/MAP kinase Stop cell proliferation Similar to nuclear hormon ...
	D103 LH lect19_C UC Irvine, BIOL 05400 Excerpt: ... l. Unlike GPCR, enzyme-linked cell surface receptors are usually single-pass transmembrane proteins. In contrast to GPCR, the cytoplasmic domain of enzyme-linked receptors does not associate with a trimeric G-protein. The cytoplasmic domain of an enzyme-linked cell surface receptor can have intrinsic enzyme activity, or may be physically associated with an enzyme. The Enzyme is often a kinase (or phosphatase) with specificity for a tyrosine, serine or threonine amino acid. GPCR Enzyme-linked Page 2 There are five major classes of enzyme-linked cell surface receptors Receptor tyrosine kinase s - have intrinsic kinase activity; phosphorylate specific tyrosine (Y) residues on a small set of intracellular signaling proteins. Tyrosine-kinase associated receptors - these cell surface receptors don't have intrinsic kinase activity, but instead they associate with proteins that have such activity. Receptor serine / threonine kinases - have intrinsic kinase activity; phosphorylate ...
	D103 LH lect19_C UC Irvine, BIOL 05400 Excerpt: ... l. Unlike GPCR, enzyme-linked cell surface receptors are usually single-pass transmembrane proteins. In contrast to GPCR, the cytoplasmic domain of enzyme-linked receptors does not associate with a trimeric G-protein. The cytoplasmic domain of an enzyme-linked cell surface receptor can have intrinsic enzyme activity, or may be physically associated with an enzyme. The Enzyme is often a kinase (or phosphatase) with specificity for a tyrosine, serine or threonine amino acid. G PCR Enzyme-linked Page 2 ere are five major classes of enzyme-linked cell surface receptors Receptor tyrosine kinase s - have intrinsic kinase activity; phosphorylate specific tyrosine (Y) residues on a small set of intracellular signaling proteins. Tyrosine-kinase associated receptors - these cell surface receptors don't have intrinsic kinase activity, but instead they associate with proteins that have such activity. Receptor serine / threonine kinases - have intrinsic kinase activity; phosphorylate s ...
	CellSignaling08Lec3 Michigan State University, MMG 409 Excerpt: ... nine kinases Receptor is a serine/threonine Kinase. 4) Histidine-kinase-associated receptors activate a "twocomponent" signaling pathway in which the kinase phosphorylates itself on histidine and then immediately transfers the phosphate to a second intracellular signaling proteins. 5) Receptor Guanylyl cyclases directly catalyze the production of cyclic GMP in the cytosol. 6) Receptorlike tyrosine phosphatases remove P from tyrosines of specific Receptor Tyrosine Kinase s Activated by a large variety of growth factors and hormones. I.e.EGF epidermal growth factor; PDGF platelet-derived growth factor, FGF's fibroblast growth factors, insulin, macrophage-colonystimulating factor. Receptor Tyrosine Kinase s Cell-surface-bound signal proteins also act through these receptors. * includes the ephrins, which regulate cell adhesion and repulsion responses that guide the migration of cells and axons along specific pathways during animal development. Eph Receptors most numerous receptor tyrosin ...
	MidtermSamples Haverford, BIOL 200 Excerpt: ... unit of the G protein, allowing GDP to dissociate and GTP, which is present at much higher concentrations, to bind. How do you suppose the activity of a G protein would be affected by a mutation that causes the affinity of the subunit for GDP to be reduced without significantly changing its affinity for GTP? QUESTION 12. Antibodies are Y-shaped molecules that have two identical binding sites. Imagine that you have obtained an antibody that is specific for the extracellular domain of a receptor tyrosine kinase . When the antibody binds the receptor, it brings together two receptor tyrosine kinase molecules. If cells containing the receptor tyrosine kinase were exposed to the antibody, would you expect the kinase to be activated, inactivated, or unaffected? Explain your reasoning. QUESTION 13. What would happen to the progeny of a cell that proceeded to mitosis and cell division after entering S phase but not completing it? Keep in mind that highly condensed chromatin, including the centromere region, is re ...
	Wk1_2REV_Jiang1999 UCLA, COURSEMBI 297 Excerpt: ... tion within a preformed dimer complex. There is evidence for conformation-dependent activation of the EpoR dimer in the published literature. For instance, the antagonist peptide EMP33 inactivates EpoR but still induces EpoR dimerization. Interestingly, For a wide range of transmembrane receptors, the crucial event that initiates a signaling pathway inside the cell is tyrosine phosphorylation. One large class of receptors the receptor tyrosine kinase s have an intrinsic tyrosine kinase domain. Many other receptors, including the large family of cytokine receptors, lack intrinsic catalytic activity but associate inside the cell with non- receptor tyrosine kinase s, which act as receptor catalytic subunits. The accepted model for activation of both types of receptor is that ligand-induced receptor dimerization juxtaposes the cytoplasmic tyrosine kinase domains, resulting in transphosphorylation of regulatory tyrosine residues in the activation loop of the partner molecule and thereby promoting phosphoryla ...
	CMNLec18 Laurentian, PSYC 3625 Excerpt: ... Psychology 3625 Cellular and Molecular Neuroscience Dr Darren Hannesson Lecture 18 Neurotransmitter receptors Ionotropic Metabotropic Neurotransmitter Receptors 2 general classes Ionotropic Ion channel Metabotropic Effector molecule Second messenger Neurotransmitter Receptors Metabotropic receptors Two types commonly found in the nervous system Receptor tyrosine kinase s G-protein coupled receptors (GPCR) Neurotransmitter Receptors Metabotropic receptors Receptor tyrosine kinase s Phosphorylates tyrosine residues Neurotransmitter Receptors Metabotropic receptors Receptor tyrosine kinase s Phosphorylates tyrosine residues growth factors, hormones regulate neuronal proliferation, differentiation, and growth neuropeptides ? Neurotransmitter Receptors Metabotropic receptors G-protein coupled receptors (GPCR) G proteins Catalyze GTP GDP Neurotransmitter Receptors Metabotropic receptors - GPCRs 3 different families Rhodopsin-adrenergic Metabotropic glutamate Secretin-VIP Neurotransmitter Receptors M ...
	CMNLec18NTReceptorsGPCRApr8 Laurentian, PSYC 3625 Excerpt: ... Psychology 3625 Cellular and Molecular Neuroscience Dr Darren Hannesson Lecture 18 Neurotransmitter receptors Ionotropic Metabotropic 1 Neurotransmitter Receptors 2 general classes Ionotropic Ion channel Metabotropic Effector molecule Second messenger Neurotransmitter Receptors Metabotropic receptors Two types commonly found in the nervous system Receptor tyrosine kinase s G-protein coupled receptors (GPCR) 2 Neurotransmitter Receptors Metabotropic receptors Receptor tyrosine kinase s Phosphorylates tyrosine residues Neurotransmitter Receptors Metabotropic receptors Receptor tyrosine kinase s Phosphorylates tyrosine residues growth factors, hormones regulate neuronal proliferation, differentiation, and growth neuropeptides ? 3 Neurotransmitter Receptors Metabotropic receptors G-protein coupled receptors (GPCR) G proteins Catalyze GTP GDP Neurotransmitter Receptors Metabotropic receptors - GPCRs 3 different families Rhodopsin-adrenergic Metabotropic glutamate Secretin-VIP 4 Neurotransmitter Rec ...
	BIPN140 axon guidance UCSD, BIPN 140 Excerpt: ... ons do not show a preference. It is now known that ephrins, a family of surface associated molecules, are expressed in gradients in the tectum and guide retinal axons to appropriate topographic positions. Ephrin A2 is expressed at high levels in posterior tectum and repels temporal axons. The effects of ephrins are mediated by Eph receptors, which are receptor tyrosine kinase s. Eph receptors are expressed at higher levels in the temporal retina than in the nasal retina. Netrins and the guidance of commissural axons: Commisural axons of the spinal cord cross the midline and project to midbrain nuclei. These fibers carry pain and temperature information. Tessier-Lavigne and colleagues showed that the floor plate secretes a diffusible signal that attracts commissural axons. They purified this activity and named it Netrin. Netrin acts as an attractant in the spinal cord but acts as a repellant signal for other neuronal populations. Netrins are conserved in vertebrates and invertebrates and mediate similar guidanc ...
	Apr 30 Ch 21 Devo Wofford, BIO 445 Excerpt: ... sperm has species selective receptors on eggs. Is it always completely exclusive? 3: Blocking Polyspermy 1) Egg membrane potential 2) Ca+2 release cortical granule release 3) Formation of Fertilization Envelope What did we call this in lab? A: Fast block (1-3 seconds) What is happening to block egg sperm interaction? We're not sure! What's your hypothesis? Na+ influx +20 4: Sperm Recognition & Possible Ca+2 Release Pathways for slow block of polyspermy and more Four Possible Systems Which one is it? More importantly, Who cares?! 5: Initiating Ca+2 release upon fertilization Receptor Tyrosine Kinase s 1) Bindin serves as ligand for RTK coupled to PLC 2) PLC activates IP3 and DAG 3) IP3 releases Ca+2 6: Initiating Ca+2 release upon fertilizationReceptor linked to a Tyrosine Kinases 1) Bindin serves as ligand for Receptro linked to Tyrosine Kinase coupled to PLC 2) PLC activates IP3 and DAG 3) IP3 releases Ca+2 7: Initiating Ca+2 release upon fertilizationReceptor linked to a Tyrosine Kinases 1) Egg ...
	obj2 Humboldt State University, MSW 13 Excerpt: ... in how transport proteins are similar to enzymes - describe a model for facilitated difusion - explain how active transport differs from diffusion - explain how the potential energy of a transmembrane solute gradient can be harvested by a cell and used to transport substances across the membrane Cell Signaling After attending lecture, reviewing their notes, and studying the text, a student should be able to: Describe the basic model of signal reception, transduction, and cellular response (Figure 11.5, 7th ed.). For example, use this model to explain how the reception of an extracellular signal might result in changes to the transcription of a gene in the nucleus (Fig 11.14, 7th ed.) Describe the receptor:ligand complex, and how this allows for specificity of response to a particular signal. Describe how the three main types of membrane receptors function, and compare and contrast these three receptors (G-protein coupled receptors, receptor tyrosine kinase s, and ligand-gated ion channels). Describe the role ...
	commuhdout Canada College, BIOL 230 Excerpt: ... Cell Communication Identify: Adenylyl cyclase Calmodulin cAMP G protein GTP Hormone IP3 Protein kinase Receptor Tyrosine kinase ...
	Lec25 UC Riverside, BCH 120 Excerpt: ... Lecture 25 Signal Transduction 1 Overview of Signaling Molecules and their Receptors Lodish 6th ed. Chapters 7.7, 15, and 16 (L.5th edition Chapters 13-14) Signal transduction is the process of converting extracellular signals into cellular respons ...
	tyrosine_kinase_signalling_comparison_review Arizona, BME 510 Excerpt: ... Cell, Vol, 80, 179-185, January27, 1995, Copyright 1995by Cell Press Review Specificity of Receptor Tyrosine Kinase Signaling: Transient versus Sustained Extracellular Signal-Regulated Kinase Activation C. J. Marshall Chester Beatty Laboratories Institute of Cancer Research 237 Fulham Road London SW3 6JB England taining proteins are recruited to phosphorylated tyrosine residues on the receptor. These SH2 domain-containing proteins include the p85 components of the phosphoinositide 3-kinase (PI3-kinase) pathway; phospholipase C-7 in the protein kinase C pathway; Src family kinases; and p120-GAP, Shc, and Grb2 in the Ras pathway (reviewed by Schlessinger, 1994). In addition, receptor kinases are able to activate the p91STAT pathway (Fu and Zhang, 1993; Silvennoinen et al., 1993; Sadowski et al., 1993). Recruitment to phosphorylated tyrosine residues on receptors leads to activation of the signaling molecule by a variety of mechanisms: tyrosine phosphorylation in the case of phospholipase C-'y and STATs (Sado ...
	TransVsSusActMapRev Arizona, MCB 572 Excerpt: ... Cell, Vol, 80, 179-185, January27, 1995, Copyright 1995by Cell Press Review Specificity of Receptor Tyrosine Kinase Signaling: Transient versus Sustained Extracellular Signal-Regulated Kinase Activation C. J. Marshall Chester Beatty Laboratories Institute of Cancer Research 237 Fulham Road London SW3 6JB England taining proteins are recruited to phosphorylated tyrosine residues on the receptor. These SH2 domain-containing proteins include the p85 components of the phosphoinositide 3-kinase (PI3-kinase) pathway; phospholipase C-7 in the protein kinase C pathway; Src family kinases; and p120-GAP, Shc, and Grb2 in the Ras pathway (reviewed by Schlessinger, 1994). In addition, receptor kinases are able to activate the p91STAT pathway (Fu and Zhang, 1993; Silvennoinen et al., 1993; Sadowski et al., 1993). Recruitment to phosphorylated tyrosine residues on receptors leads to activation of the signaling molecule by a variety of mechanisms: tyrosine phosphorylation in the case of phospholipase C-'y and STATs (Sado ...
	L4 UCSC, BIO 126 Excerpt: ... ynaptic basal lamina direct the clustering of AChRs Experiments: Cutaneous pectoris muscles from male frogs. Nerves were crushed, muscle were cut from both sides, Schwann cells were frozen to death. McMahan Lab Agrin triggers cluster of AChRs - a small molecule (~400kd), secret by nerve terminal and isolated based on clustering preexisting AChR; Agrin triggers cluster of AChRs - a small molecule (~400kd), secret by nerve terminal and isolated based on clustering preexisting AChR; - interact with postsynaptic MuSK (muscle specific kinase), a receptor tyrosine kinase , causes phosphorylation of AChR -subunit, and result in AChR immobilization; also causes clustering of other synaptic proteins; rapsyn mediates the Agrin-MuSk interaction and AChR clustering; Agrin triggers cluster of AChRs - a small molecule (200kd), secret by nerve terminal and isolated based on clustering preexisting AChR; - interact with postsynaptic MuSK (muscle specific kinase), a receptor tyrosine kinase , causes phosphorylation o ...