Multivalency-Assisted Control of Intracellular Signaling Pathways: Application for Ubiquitin- Dependent N-End Rule Pathway  Shashikanth M. Sriram, Rajkumar.

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Multivalency-Assisted Control of Intracellular Signaling Pathways: Application for Ubiquitin- Dependent N-End Rule Pathway  Shashikanth M. Sriram, Rajkumar Banerjee, Ravi S. Kane, Yong Tae Kwon  Chemistry & Biology  Volume 16, Issue 2, Pages 121-131 (February 2009) DOI: 10.1016/j.chembiol.2009.01.012 Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 1 Different Types of Multivalent Ligands and a Model Showing the Influence of the Linker on Effective Concentrations of Divalent Molecules (A–C) Shown are interhomovalent (A), interheterovalent (B), and intraheterovalent (C) molecules. (D–F) The bound ligand in a divalent molecule confines the other ligand to the hemispherical proximity, influencing the effective concentration (Ceff) as a function of its linker length. Shown are RF-Cn-type molecules (see below), in which the linker is longer (D), optimal (E), or shorter (F) compared with the distance between two binding sites of the target. Chemistry & Biology 2009 16, 121-131DOI: (10.1016/j.chembiol.2009.01.012) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 2 The Ubiquitin-Proteasome System The substrates are ubiquitylated through multiple rounds of a linear reaction catalyzed by E1, E2, and E3. Shown as an example is the N-end rule pathway. Chemistry & Biology 2009 16, 121-131DOI: (10.1016/j.chembiol.2009.01.012) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 3 The Structure of the N-End Rule Pathway and the Creation of Destabilizing N-Terminal Residues (A) The mammalian N-end rule pathway. (B and C) The creation of destabilizing N-terminal residues through the removal of N-terminal Met (B) or the endoproteolytic cleavage of a protein (C). Chemistry & Biology 2009 16, 121-131DOI: (10.1016/j.chembiol.2009.01.012) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 4 The UBR Box Protein Family (A) A schematic diagram of UBR box proteins. UBR indicates UBR box; RING, RING finger; CRD, cysteine-rich domain; HECT, HECT domain; PHD, plant homeodomain finger; UAIN, UBR-specific autoinhibitory domain. (B) A sequence alignment of the UBR boxes from four species. Shown are the ∼70 amino acid regions where conserved Cys and His residues are highlighted (cyan). m indicates Mus musculus; d, D. melanogaster; a, A. thaliana; sc, S. cerevisiae. Chemistry & Biology 2009 16, 121-131DOI: (10.1016/j.chembiol.2009.01.012) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 5 The Heterodivalent Inhibitor RF-C11 and its Control Compounds (A) A space-filling model of RF-C11. (B) Structures of RF-C11 and its control compounds. Terminal moieties are indicated by colored background. Chemistry & Biology 2009 16, 121-131DOI: (10.1016/j.chembiol.2009.01.012) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 6 The Control of Cardiac Signaling and Hypertrophy by RF-C11 Shown is a model where RGS4, RGS5, and RGS16 are cotranslationally degraded through serial Cys-2 modifications (see the main text). In this model, the heterovalent interaction of RF-C11 to the N-recognin family inhibits the degradation of these RGS proteins in cardiomyocytes, leading to their metabolic stabilization and inactivation of G protein signaling. Chemistry & Biology 2009 16, 121-131DOI: (10.1016/j.chembiol.2009.01.012) Copyright © 2009 Elsevier Ltd Terms and Conditions