cell surface receptors - sites.usp.br · the jak-stat pathway for the intracellular relaying of...
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Cell surface receptors
ion-channel-linked
guanylylcyclases
tyrosinekinases
tyrosine kinaseassociated
tyrosinephosphatases
serin/threoninekinases
enzyme-linked G-protein-linked
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Cinases
On the basis of amino acid :
Tyrosine kinases,
Serine threonine (PKC, Plk,Rho Kinases)
Receptor (EGFR,FGFR,PDGFR)
Non receptor (JAK,src,Abl,MAPK)
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Receptor tirosina quinase Signal molecule
Signal-binding site
CYTOPLASM
Tyrosines
Signal molecule αHelix in the
Membrane
Tyr
Tyr Tyr
Tyr Tyr
Tyr Tyr
Tyr Tyr
Tyr Tyr
Tyr
Tyr
Tyr Tyr
Tyr Tyr
Tyr Tyr
Tyr Tyr
Tyr Tyr
Tyr
Tyr
Tyr Tyr
Tyr Tyr
Tyr
Dimer Receptor tyrosine kinase proteins (inactive monomers)
P P P
P P
P Tyr
Tyr Tyr
Tyr Tyr
Tyr P
P P
P P
P Cellular response 1
Inactive relay proteins
Activated relay proteins
Cellular response 2
Activated tyrosine- kinase regions (unphosphorylated dimer)
Fully activated receptor tyrosine-kinase (phosphorylated dimer)
6 ATP 6 ADP
The cytoplasmic domain is a protein kinase that phosphorylates Tyr residues (a Tyr kinase) in specific target proteins. The receptors for insulin and epidermal growth factor are prototypes for the approximately 60 RTKs in humans.
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Growth factor receptors that initiate signals through Tyr kinase activity include those for insulin (INSR), vascular epidermal growth factor (VEGFR), platelet-derived growth factor (PDGFR), epidermal growth factor (EGFR), high-affinity nerve growth factor (TrkA), and fibroblast growth factor (FGFR).
Domain organization in a variety of receptor tyrosine kinase (RTK)
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Some Signaling Proteins That Act Via Receptor Tyrosine Kinases
SIGNALING LIGAND RECEPTORS SOME RESPONSES
Epidermal growth factor (EGF) EGF receptor stimulates proliferation of various cell types Insulin insulin receptor stimulates carbohydrate utilization and protein synthesis
Insulin-like growth factors IGF receptor-1 stimulate cell growth and survival
(IGF-1 and IGF-2)
Nerve growth factor (NGF) Trk A stimulates survival and growth of some neurons
Platelet-derived growth factors PDGF receptors stimulate survival, growth, and proliferation of various cell types
Macrophage-colony-stimulating M-CSF receptor stimulates monocyte/macrophage
factor (M-CSF) proliferation and differentiation
Fibroblast growth factors FGF receptors stimulate proliferation of various cell (FGF-(FGF1 to FGF-24) (FGF-R1–FGFR4) types; inhibit differentiation of some precursor cells; inductive signals in development
Vascular endothelial growth VEGF receptor stimulates angiogenesis
factor (VEGF)
Ephrins (A and B types) Eph receptors (A and B) stimulate angiogenesis; guide cell and axon migration
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Many signaling processes are mediated by an assembly of multiple signaling molecules.
Assembly of signaling molecules
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Intracellular Signaling Pathways
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Signal Termination
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Receptor enzimático: A ligação do ligante ao domínio extracelular estimula a atividade enzimática no domínio intracelular.
O Receptor de Insulina é uma tirosina quinase que se auto-fosforila e em seguida cataliza a fosforilação de outras proteínas alvo.
Insulin regulates both metabolic enzymes and
gene expression
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Insulin signal transduction.
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Regulation of gene expression by insulin through a MAP kinase cascade
Insulin receptor: INS-R INS-R autophosphorylation Insulin receptor substrate -1 (IRS-1) Ras Raf-1 MEK: MAPKK ERK: MAPK Elk1 Serum response factor (SRF)
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Cross talk between GPCR and RTK
Insulin - INS-R Phosphorylates β-adrenergic receptor. PKB Internalization of adrenergic receptor. Alternatively, INS-R–catalyzed phosphorylation of a GPCR INS-R uses GPCR to enhance its own signaling.
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Receptor tyrosine kinase Growth factors: EGF, PDGF etc
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Growth factors: EGF, PDGF
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Mutant ras can bind GTP but can not hydrolyze it, and thus remain constitutively in “on” state Most oncogenic ras proteins contain a mutation in codon 12 (Gly). This blocks the binding of GAP to ras, and prevents GTP hydrolysis.
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~30% of all cancers involve Ras mutations.
RTS signaling and Ras GTPase
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RTK-RAS-MAPK cascade
RTK: kinase receptor Ras: GTPase MAPKKK: kinase MAPKK: kinase MAPK: kinase Transcription factors (e.g., c-Fos) Why multi-step in signaling? Signal amplified in number and duration Signal fine regulated Signal cross talks
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The Ras-activated MAP kinase cascade.
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The JAK-STAT transduction mechanism for the erythropoietin receptor
Erythropoietin (EPO) Dimerization of EPO receptor. JAK phosphorylates EPO-R. (a)STAT5 binds to P–EPO-R JAK - p-STAT STAT5 dimer Exposing a nuclear localization sequence (NLS). (b) Grb2 binds P–EPO-R and triggers the MAPK cascade.
Cytokines: paracrine/autocrine polypeptides Interleukins: immune response in leukocyte Interferons: immune response against viruses or bacteria
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The JAK-STAT pathway for the intracellular relaying of cytokine
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23
RTK = receptor tyrosine kinase
Shc = adapter protein tyr P by growth factors contains PTB, SH2 domains
and tyr P sites Grb2 = adapter protein with 1 SH2 & 2 SH3 domains
SOS = son of sevenless = GEF for Ras
Ras = small G-protein, part of p21 Ras family including H-Ras, K-Ras,
N-Ras, & R-Ras
cRAF1 = a tyrosine kinase
GAP = GTPase activating protein
MEKs = Map Kinase Kinases, unusual in that it will phosphorylate both
thr and tyr (at least 7) MEK = MAPK/ERK Kinase
ERKs = Extracellular signal Regulated protein Kinase; MAP kinases (mitogen activated kinases) phosphorylated on TEY motif (others include JNKs, SAPKs, & p38 kinase)
GEF = Guanine Nucleotide Exchange Factor Raf
MEK1/2
ERK1/2
Rsk , MSK1,
etc
Mitogenesis, Differentiation,
Proliferation, development, neuronal survival,
Memory formation
Transcription Factors
Cytoskeletal proteins
SOS
Shc Grb2
Ras
Hormone
Classic “Map Kinase” Pathway
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MAP kinase cascades in mammalian cells.
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Tyrosine kinase-derived oncogenes Oncogene Retrovirus cellular counterpart
v-src Rous sarcoma c-src v-erbB avian erythroblastosis EGF receptor v-fms McDonough feline sarcoma CSF-1 receptor v-kit feline sarcoma SCF receptor v-abl Abelson murine leukemia c-abl
v-sis simian sarcoma PDGF
Tyrosine kinase oncogenes are formed as a result of mutations that induce constitutive kinase activity.. Activated tyrosine kinase oncogenes generally cause enhanced proliferation and prolonged viability, but do not typically block differentiation. Common signaling pathways are involved in mediating these effects, including activation of phosphotidylinositol 3-kinases (PI3K), the Ras/Raf/MAP kinases, phospholipase C-γ (PLCγ), and Signal transducers and activators of transcription (Stats).
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Int J Med Sci. 2004; 1(2): 101–115.
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Int J Med Sci. 2004; 1(2): 101–115.
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Int J Med Sci. 2004; 1(2): 101–115.
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VEGFR-3 mutations in hereditary lymphedema
ss
VEGF-R3
S641P
P1114L
Original definition included congenital, bilateral or unilateral, chronic hereditary edema in lower extremities, causing inhibition in receptor autophosphorylation
Indivíduos portadores de uma mutação VEGFR3 exibem edema congênito dos membros inferiores, geralmente bilateralmente e abaixo dos joelhos, às vezes associado a celulite, veias proeminentes, papilomatose e hidrocele.
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Clin Genet. 2006 Oct;70(4):330-5.
VEGFR-3 mutations in hereditary lymphedema
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Interação proteína – proteína (Two hybrid)
The yeast two-hybrid assay uses two plasmid constructs: - Bait plasmid, which is the protein of interest fused to a GAL4 binding domain, - Hunter plasmid, which is the potential binding partner fused to a GAL4 activation domain.
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The two-hybrid system.
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Pull-down assays
https://www.thermofisher.com
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Hanahan and Weinberg (2000) Cell 100: 57.
Signal Transduction Cross-Talk Plays a major Role in Biology