Cell Signaling & Neuroscience DNA Repair Chromatin Modification

Slides Programmed Cell Death Activation and Inhibition of Apoptosis Mitochondria in Apoptosis ATM/p53 Signaling Pathway Caspase Cascade Caspase Activation Intrinsic Pathway Granzyme B FAS and Related Proteins Fas Signaling G1, and S Phases G2 and M Phases Regulatory Cascade The p53 Signaling Pathway Cytokines and Growth Factors Structures of Activin and Inhibin Structures of Chemokine Receptors Angiopoietins EGFR Signaling Pathway Transmembrane Precursors of EGF Possible Receptor Combos and Ligand Actions of Flt-3/Flk-2 Hedgehog and BMI1 IGF Regulation of Apoptosis IL-13 and IL-4 receptor IL-18 Production Neurotrophins and Their Receptors TrkA GDNF Family with Receptors PDGF Receptors and Actions TGF-beta Signaling BMP Signaling TNF Signaling TNF-α and TNF-β Proposed Balance Between TNF Superfamily Structure of Receptors VEGF Receptor and Ligands Prolactin Regulation Insulin Pathway Glucocorticoid Receptor Signaling Vascular Endothelial Cell Interactions Integrin Signaling in Cell Survival VEGF Receptor Signaling MMPs and Cytokines Events Leading to Angiogenesis Transcription Factors Nuclear Complex Targeting Jak/Stat Pathway STAT3 PPAR Formation of Nucleosomes DNA Compaction Early Response Events Cell Cycle Checkpoint Linkage between DNA Repair and Chromatin Modification Functions of WRN, BLM and MRE11 mRNP Transport Importinα - Importinβ Pathway Modular Structure of Transcription factors Transcription Activation by Nuclear Receptors Coupled RNA Splicing and Nuclear Export RNA Polyadenylation Mammalian mRNA Polyadenylation RNA Maturation Epigenetic Control Phosphorylation-driven Initiation-Elongation cAMP Metabolism cGMP Metabolism G-Protein Signaling T Cell Receptor B Cell Receptor Monovalent Ion Channels Activation/Inactivation Ligand-Gated Ion Channel Aquaporin Channel Structure Calcium Channel Structure Calcium Channel Pore Region Chloride Channel HCN Channel 2TM Potassium Channel Structure 6TM Potassium Channel Structure Sodium Channel Structure Sodium Channel Pore Region PTEN Pathway Lipids in Cell Signaling Inositol Phosphates Phosphatidic Acid Inositol Phospholipids ABC Transporters ABC-ATPases BSEP MRP1 β-Amyloid Plaques Notch Secretase Second Messenger Systems Limbic Reward Circuit Major Pathways in the CNS Endothelin Signaling NPY and Catecholamines Ascending Pain Pathway Modulation of Pain Transmission Mechanism of Action Fig. A Mechanism of Action Fig. B Drug Activation of Dopaminergic GABAB Receptor Oxidative Stress nNOS eNOS iNOS Nitric Oxide Proteasome/Ubiquitination Formation of Activated 20S Proteasome Ubiquitin Pathway MAP Kinase Cascades AKT Signaling Pathways Activated by VEGF

Linkage Between DNA Repair and Chromatin Modification

Biochemical experiments have permitted the identification of acidic factors that can form complexes with histones and enhance the process of histone deposition. They act as histone chaperones by facilitating the formation of nucleosome cores without being part of the final reaction product. These histone-interacting factors, also called chromatin-assembly factors (CAF), can bind preferentially to a subset of histone proteins. Chromatin Assembly Factor-1 (CAF-1) interacts with newly synthesized acetylated histones H3 and H4 to preferentially assemble chromatin during DNA replication. CAF-1 is also capable of promoting the assembly of chromatin specifically coupled to the repair of DNA. The recent demonstration of the interaction of CAF-1 with the protein Proliferating Cell Nuclear Antigen (PCNA) established a molecular link between the assembly of chromatin and the processes of replication and repair of DNA. PCNA function can be regulated by the binding of several proteins including p21, MCMT, XPG, p33ING1b, FEN1, and the growth arrest after DNA damage (GADD45) proteins. They have in common a PCNA-Interacting-Protein Domain (PIP) consisting of Qxxhxxaa where Q is glutamine, x is any amino acid, h is a hydrophobic amino acid and a is an aromatic amino acid. P33ING1b in particular binds to PCNA in a uv-inducible manner and recruits different HAT complexes to the site of replication/repair therefore functionally bridging DNA repair and chromatin modification.

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